Most cited articles
2008, 25(1):85-87.
Abstract:
It is a complex problem of multi-objective decision making on venture capital appraisal in Real estate.Multi-objective decision-making question most remarkable two characteristics: The objective may not the commensurability and objective contradictory.Using to the multi-goals decision-making characteristic,incompletely the information fuzzy multi-objective decision-making method was applied according to the data between relational objective weights,the shortcoming of expert subjective give weight was overcame,the venture capital synthesis appraisal problem was solved well,reasonable plan arrangement result was obtained.The results of tests show that this method whose physical conception is clear,mathematics reasoning is rigorous,solution is simply and confidence level is high.
It is a complex problem of multi-objective decision making on venture capital appraisal in Real estate.Multi-objective decision-making question most remarkable two characteristics: The objective may not the commensurability and objective contradictory.Using to the multi-goals decision-making characteristic,incompletely the information fuzzy multi-objective decision-making method was applied according to the data between relational objective weights,the shortcoming of expert subjective give weight was overcame,the venture capital synthesis appraisal problem was solved well,reasonable plan arrangement result was obtained.The results of tests show that this method whose physical conception is clear,mathematics reasoning is rigorous,solution is simply and confidence level is high.
2010, 27(3):95-99.
Abstract:
In order to solve the problem including huge calculated amount and confirming the weights un- reasonably which exist in multi- target orthogonal test method, multi-target orthogonal test design was optimized by matrix analysis. Three-layer structure model and the layer structure matrix of orthogonal test were established firstly, thenweight matrix of test index can beworked out by matrix of each layer multiples cation and the weighs of the factors and levels having influences on the tests' results can be calculated. Fi- nally the optimal plan and the important order of the factors' influences on the tests' index values can be determined according to the weights. The results show that the problem of selecting the optimal plan in multi-target orthogonal test design can be solved very well.
In order to solve the problem including huge calculated amount and confirming the weights un- reasonably which exist in multi- target orthogonal test method, multi-target orthogonal test design was optimized by matrix analysis. Three-layer structure model and the layer structure matrix of orthogonal test were established firstly, thenweight matrix of test index can beworked out by matrix of each layer multiples cation and the weighs of the factors and levels having influences on the tests' results can be calculated. Fi- nally the optimal plan and the important order of the factors' influences on the tests' index values can be determined according to the weights. The results show that the problem of selecting the optimal plan in multi-target orthogonal test design can be solved very well.
2008, 25(3):26-29.
Abstract:
The elastic-inhomogeneous-ring method and beam-spring methods of internal forces calculations for the shield tunnel lining are discussed in detail.As a traditional method of shield tunnel lining designing,the elastic-inhomogeneous-ring is safe but conservative.Combining with a practical engineering example,its internal forces were calculated respectively by the two methods.The results of these two methods were compared and analyzed,and drew the conclusion that the beam-spring method for the designing of the shield tunnel lining is safe and economical.
The elastic-inhomogeneous-ring method and beam-spring methods of internal forces calculations for the shield tunnel lining are discussed in detail.As a traditional method of shield tunnel lining designing,the elastic-inhomogeneous-ring is safe but conservative.Combining with a practical engineering example,its internal forces were calculated respectively by the two methods.The results of these two methods were compared and analyzed,and drew the conclusion that the beam-spring method for the designing of the shield tunnel lining is safe and economical.
2008, 25(2):65-68.
Abstract:
Impact pressure is a kind of disparity phenomenon in mine pressure,also a kind of complex dynamic phenomenon,It strictness threat safety production under mine and it is one of the graveness disaster during the course of exploitation.With the increase of mine depth,Impact pressure graveness disaster will become more graveness,and some mines occur burst.The theory analyzes the condition and influence of impact pressure,moreover proffer the forecast technology and preventive measures.
Impact pressure is a kind of disparity phenomenon in mine pressure,also a kind of complex dynamic phenomenon,It strictness threat safety production under mine and it is one of the graveness disaster during the course of exploitation.With the increase of mine depth,Impact pressure graveness disaster will become more graveness,and some mines occur burst.The theory analyzes the condition and influence of impact pressure,moreover proffer the forecast technology and preventive measures.
2008, 25(2):62-64.
Abstract:
The "JC" method reliability is used to evaluate the steadiness of impervious base reasonably.Limit state equations for reliability of impervious base are given after analyzing randomness of hydraulic pressure,depth of destructive bed and coefficient of water inrush.This paper calculates reliability index, lose efficacy probability and coefficient of water inrush corresponding to the thickness of different impervious base.The lose efficacy probability of the impervious base ranges suitably in 1.5×10-3～3.0×10-3 by contrast with other accidents.
The "JC" method reliability is used to evaluate the steadiness of impervious base reasonably.Limit state equations for reliability of impervious base are given after analyzing randomness of hydraulic pressure,depth of destructive bed and coefficient of water inrush.This paper calculates reliability index, lose efficacy probability and coefficient of water inrush corresponding to the thickness of different impervious base.The lose efficacy probability of the impervious base ranges suitably in 1.5×10-3～3.0×10-3 by contrast with other accidents.
2008, 25(3):64-66.
Abstract:
The flush regularity and the correlation of the main pollutants,the quality of rainwater from the main catchments of Handan were studied in order to realize the rainwater runoff pollution.It is helpful to control the runoff pollution of Handan.The results indicate that the runoff pollution of Handan is comparative severe.It is also affirmed that the first flush regularity of rainwater runoff is existent.Furthermore,SS has well linearity relation with COD,TN and TP.
The flush regularity and the correlation of the main pollutants,the quality of rainwater from the main catchments of Handan were studied in order to realize the rainwater runoff pollution.It is helpful to control the runoff pollution of Handan.The results indicate that the runoff pollution of Handan is comparative severe.It is also affirmed that the first flush regularity of rainwater runoff is existent.Furthermore,SS has well linearity relation with COD,TN and TP.
2009, 26(1):81-84.
Abstract:
This study based on Soil Erosion Classification Grade Criteria(SL 19096) issued by the ministry of water resources and the multifactor comprehensive method in the second national soil erosion investigation.QuickBird remote sensing image and DEM were used for data origin in this study.Soil erosion intensity in Baode mining area was assessed by three factors of vegetation coverage,farmland in slope and slope selected as assessing indices.GIS and remote sensing technology were employed in this study.The space distribution of soil erosion intensity in different degree and reason of this distribution were also showed in this paper.
This study based on Soil Erosion Classification Grade Criteria(SL 19096) issued by the ministry of water resources and the multifactor comprehensive method in the second national soil erosion investigation.QuickBird remote sensing image and DEM were used for data origin in this study.Soil erosion intensity in Baode mining area was assessed by three factors of vegetation coverage,farmland in slope and slope selected as assessing indices.GIS and remote sensing technology were employed in this study.The space distribution of soil erosion intensity in different degree and reason of this distribution were also showed in this paper.
2009, 26(1):85-89.
Abstract:
This paper summarizes the common methods for studying of skarns and skarn deposits both macroscopically and microcosmically,including remote sensing interpretation,physical geographical prospecting,field geological mapping,petrography(or mineralogy) and mineralogy,mineral phase equilibrium,fluid inclusion and stable isotope,the new means developed recently such as remote sensing interpretation and quantitive calculation for mineral phase equilibrium are introduced especially.The consideration of integration of macroscopic and microcosmic methods and constant introduction of new means in the skarn deposit studies have important significance in further revealing the formation and distribution of skarn deposits,and understanding their petrogenic and metallogenic mechanism.
This paper summarizes the common methods for studying of skarns and skarn deposits both macroscopically and microcosmically,including remote sensing interpretation,physical geographical prospecting,field geological mapping,petrography(or mineralogy) and mineralogy,mineral phase equilibrium,fluid inclusion and stable isotope,the new means developed recently such as remote sensing interpretation and quantitive calculation for mineral phase equilibrium are introduced especially.The consideration of integration of macroscopic and microcosmic methods and constant introduction of new means in the skarn deposit studies have important significance in further revealing the formation and distribution of skarn deposits,and understanding their petrogenic and metallogenic mechanism.
2009, 26(3):81-84.
Abstract:
40 samples of soybean(Glycine max(L.) Merr.) in field were took out to observe their root morphology at vegetative and pod stage respectively.Meanwhile,the drought tolerance of these varieties were tested at vegetative stage by cultivated in pots and their root morphological and physiological traits were researched.The results show that soybean root morphology varies in the two stages or in the same stage but in different conditions.There were evident and extensive genetic variations in the root morphological parameters among varieties with different water applying,including total root length,root volume,root dry weight,root reductive activity,root total absorbing area and root active absorbing area.There was also significant difference response in root traits among varieties with strong drought tolerance and weak drought tolerance.Therefore the research provides a new way for soybean breeding improvement by selecting root traits.
40 samples of soybean(Glycine max(L.) Merr.) in field were took out to observe their root morphology at vegetative and pod stage respectively.Meanwhile,the drought tolerance of these varieties were tested at vegetative stage by cultivated in pots and their root morphological and physiological traits were researched.The results show that soybean root morphology varies in the two stages or in the same stage but in different conditions.There were evident and extensive genetic variations in the root morphological parameters among varieties with different water applying,including total root length,root volume,root dry weight,root reductive activity,root total absorbing area and root active absorbing area.There was also significant difference response in root traits among varieties with strong drought tolerance and weak drought tolerance.Therefore the research provides a new way for soybean breeding improvement by selecting root traits.
2010, 27(1):81-84.
Abstract:
The numerical simulation method by EASY% Ro is used to simulate and reiterate the thermal evolution history of the No.2 coal mine in eastern Fengfeng,and the characteristics of the coal's generation and evolution are discussed.The coal mine in eastern Fengfeng,which is influenced by the structure movement and the magmatic activity,is thought to experience two stages that the gas generated.In the early stage,it is mainly affected by the region plutonic metamorphism,and the organic matter of the coal is generated gas under the plutonic metamorphism function;while in the late stage,it is influenced by the magmatic activity,and the coal seam in the area is further deteriorated,then coal-seam gas is generated again.Accordingly,gas-bearing property and its major control factors in the research area are analyzed,such as the lithology of the coal reservoir roof and floor,the characteristics of the distribution,the geologic structure,the magmatic intrusion and the hydrogeological conditions and so on,which lead to uneven distribution of the methane content of the coal-seam in the plane and the section planes.
The numerical simulation method by EASY% Ro is used to simulate and reiterate the thermal evolution history of the No.2 coal mine in eastern Fengfeng,and the characteristics of the coal's generation and evolution are discussed.The coal mine in eastern Fengfeng,which is influenced by the structure movement and the magmatic activity,is thought to experience two stages that the gas generated.In the early stage,it is mainly affected by the region plutonic metamorphism,and the organic matter of the coal is generated gas under the plutonic metamorphism function;while in the late stage,it is influenced by the magmatic activity,and the coal seam in the area is further deteriorated,then coal-seam gas is generated again.Accordingly,gas-bearing property and its major control factors in the research area are analyzed,such as the lithology of the coal reservoir roof and floor,the characteristics of the distribution,the geologic structure,the magmatic intrusion and the hydrogeological conditions and so on,which lead to uneven distribution of the methane content of the coal-seam in the plane and the section planes.
2011, 28(1):5-9.
Abstract:
The recycled aggregate concrete(RAC) were respectively prepared with 0%,30%,50% of recycled aggregate made from C25 grade waste concrete,to research the effect of the recycled aggregate replacement ratio and the load on the corrosion resistance.Then the dry-wet test with the aggressive medium of artificial seawater under the effect of bending stress by 0,10,20,30,40 and 50 cycles were carried out on the RAC specimens to observe the influence of artificial seawater corrosion on the RAC internal damage.The results show that the bending stress has accelerated deterioration velocity of the material performance of RAC in environment of artificial seawater.Furthermore,the corrosion damage of RAC in artificial seawater decreases with the increase of recycled aggregate replacement ratio in the same bending stress coefficient,and the corrosion damage of RAC in artificial seawater increases with the increase of bending stress coefficient in the same recycled aggregate replacement ratio.
The recycled aggregate concrete(RAC) were respectively prepared with 0%,30%,50% of recycled aggregate made from C25 grade waste concrete,to research the effect of the recycled aggregate replacement ratio and the load on the corrosion resistance.Then the dry-wet test with the aggressive medium of artificial seawater under the effect of bending stress by 0,10,20,30,40 and 50 cycles were carried out on the RAC specimens to observe the influence of artificial seawater corrosion on the RAC internal damage.The results show that the bending stress has accelerated deterioration velocity of the material performance of RAC in environment of artificial seawater.Furthermore,the corrosion damage of RAC in artificial seawater decreases with the increase of recycled aggregate replacement ratio in the same bending stress coefficient,and the corrosion damage of RAC in artificial seawater increases with the increase of bending stress coefficient in the same recycled aggregate replacement ratio.
12 Application of gray relationship model basing on entropy onconstruction engineering bid evaluation
2013, 30(1):103-106.
DOI: 10.3969/j.issn.1673-9469.2013.01.025
Abstract:
Bidding information is not all clear in the construction project bid evaluation.In order to eliminate the evaluation index to determine the weight of the subjective influence and select the mostclose to the owners of the ideal contractor bid unit,grey related degree model for engineering biddingevaluation was proposed based on the entropy weight.The index weight of evaluation index system wasdetermined by application of entropy method,grey correlation method was applied to determine contractors’ association degree between bidding units and the owner’s ideal.The great association degree indicatesthat bidding units is line with contracting business approach and the owners of the construction requirements.The results show that the combination of entropy weight correlation calculationis applied to the engineering bid evaluation,which makes evaluation result more objective,practicalfor the owners to demarcate mark and provides a quantitative basis for decision making,while it isbeneficial for the unit to choose reasonable contractors.
Bidding information is not all clear in the construction project bid evaluation.In order to eliminate the evaluation index to determine the weight of the subjective influence and select the mostclose to the owners of the ideal contractor bid unit,grey related degree model for engineering biddingevaluation was proposed based on the entropy weight.The index weight of evaluation index system wasdetermined by application of entropy method,grey correlation method was applied to determine contractors’ association degree between bidding units and the owner’s ideal.The great association degree indicatesthat bidding units is line with contracting business approach and the owners of the construction requirements.The results show that the combination of entropy weight correlation calculationis applied to the engineering bid evaluation,which makes evaluation result more objective,practicalfor the owners to demarcate mark and provides a quantitative basis for decision making,while it isbeneficial for the unit to choose reasonable contractors.
13 Plane steady temperature fields in a FGM plate subjected to boundary different constant temperatures
2013, 30(2):4-8.
DOI: 10.3969/j.issn.1673-9469.2013.02.002
Abstract:
The heat conductivity in the FGM plate was expressed by exponential function along theheight direction of the plate,based on the plane steady heat conduction basic equation of the plate,the series analytical solution of the plane steady temperature fields of in the plate subjected to the dif-ferent constant temperature of boundary was derived by variable separation method.Compared withFEM,the maximum node temperature error of two methods was 0.86%.Through the numerical cal-culations,the plane steady temperature field distributions in the plate were obtained,and the effectsof material gradient parameters and the geometric composition of the plate on the temperature fieldswere studied.The main results show as follows:(1)The temperature field distribution in the plate issymmetrical to the axis y through the centroid.(2)With the increase of gradient parameter value,thehigh temperature zone in the plate is extended to the two sides and lower side of plate.(3)With thedecreasing of the plate height,central lower temperature distribution in the plate tends gently.Thus,the suitable selection of gradient parameter and geometric composition can meet the need of the de-sign,application and analysis of the thermal stress,and the analytical solution obtained can be usedas a reference standard for other approximate methods.
The heat conductivity in the FGM plate was expressed by exponential function along theheight direction of the plate,based on the plane steady heat conduction basic equation of the plate,the series analytical solution of the plane steady temperature fields of in the plate subjected to the dif-ferent constant temperature of boundary was derived by variable separation method.Compared withFEM,the maximum node temperature error of two methods was 0.86%.Through the numerical cal-culations,the plane steady temperature field distributions in the plate were obtained,and the effectsof material gradient parameters and the geometric composition of the plate on the temperature fieldswere studied.The main results show as follows:(1)The temperature field distribution in the plate issymmetrical to the axis y through the centroid.(2)With the increase of gradient parameter value,thehigh temperature zone in the plate is extended to the two sides and lower side of plate.(3)With thedecreasing of the plate height,central lower temperature distribution in the plate tends gently.Thus,the suitable selection of gradient parameter and geometric composition can meet the need of the de-sign,application and analysis of the thermal stress,and the analytical solution obtained can be usedas a reference standard for other approximate methods.
2014, 31(2):106-109.
DOI: 10.3969/j.issn.1673-9469.2014.02.027
Abstract:
With the rapid development of China's construction industry,but also with a lot of waste of resources and environmental pollution,are seriously threats to the human living environment. Green building research,therefore,become today's construction goal,which needs establish a set of system,justice,green building evaluation system. This program uses analytic hierarchy process for green buildings weight analysis. On this basis,an effective solution to the problem of green building evaluation fuzzy comprehensive evaluation model was established by taken examples of green building evaluation of the case. The case evaluation of the overall quality is "good". Examples of calculation described by fuzzy comprehensive evaluation model can effectively evaluate the "green"level of green building.
With the rapid development of China's construction industry,but also with a lot of waste of resources and environmental pollution,are seriously threats to the human living environment. Green building research,therefore,become today's construction goal,which needs establish a set of system,justice,green building evaluation system. This program uses analytic hierarchy process for green buildings weight analysis. On this basis,an effective solution to the problem of green building evaluation fuzzy comprehensive evaluation model was established by taken examples of green building evaluation of the case. The case evaluation of the overall quality is "good". Examples of calculation described by fuzzy comprehensive evaluation model can effectively evaluate the "green"level of green building.
15 Analysis on the change law of the displacement of retaining structure of deep foundation pit lateral
2014, 31(3):31-34,51.
DOI: 10.3969/j.issn.1673-9469.2014.03.008
Abstract:
According to the monitoring data mediator Nanjing Metro Line station,this paper analyzed the deformation characteristics of the underground continuous wall. It is found that the law of space effect is quite obvious during excavation retaining structure deformation; and the amount of land in the vicinity of the lateral wall of the base reaches a maximum with the increasing of excavation depth. It is also found that a wall changes similar parabola,the lateral displacement of the wall decreases with increasing of their stiffness and. Combined with plane finite element analysis software plaxis and HS wall deformation constitutive model,the main factors were analyzed. The analysis results suggest that,the thickness of its walls takes(2. 5% ~ 3. 5%) H when the Nanjing area of excavation depth is H.
According to the monitoring data mediator Nanjing Metro Line station,this paper analyzed the deformation characteristics of the underground continuous wall. It is found that the law of space effect is quite obvious during excavation retaining structure deformation; and the amount of land in the vicinity of the lateral wall of the base reaches a maximum with the increasing of excavation depth. It is also found that a wall changes similar parabola,the lateral displacement of the wall decreases with increasing of their stiffness and. Combined with plane finite element analysis software plaxis and HS wall deformation constitutive model,the main factors were analyzed. The analysis results suggest that,the thickness of its walls takes(2. 5% ~ 3. 5%) H when the Nanjing area of excavation depth is H.
2016, 33(2):19-24.
DOI: 10.3969/j.issn.1673-9469.2016.02.005
Abstract:
The classical weak expansive soil existed widely in Hefei was treated by mixing with randomly and uniformly distributed jute fiber. And a series of direct shear and unconfined compression tests were conducted on soil samples of ten groups including expansive soil and reinforced soil with jute fiber of varying fiber content and fiber length. Besides, the improving mechanism of fiber reinforcement and the effects of fiber length and fiber content on the strength characteristics of jute fiber-reinforced soil were analyzed briefly. Results of this investigation show that:Incorporating randomly distributed jute fiber into expansive soil could enhance observably the shear strength of soil, Jute fiber reinforcement improved the shear failure mode of expansive soil, at the same time, the length and the width of the fractures on the surface of soil specimens after failure reduced largely.
The classical weak expansive soil existed widely in Hefei was treated by mixing with randomly and uniformly distributed jute fiber. And a series of direct shear and unconfined compression tests were conducted on soil samples of ten groups including expansive soil and reinforced soil with jute fiber of varying fiber content and fiber length. Besides, the improving mechanism of fiber reinforcement and the effects of fiber length and fiber content on the strength characteristics of jute fiber-reinforced soil were analyzed briefly. Results of this investigation show that:Incorporating randomly distributed jute fiber into expansive soil could enhance observably the shear strength of soil, Jute fiber reinforcement improved the shear failure mode of expansive soil, at the same time, the length and the width of the fractures on the surface of soil specimens after failure reduced largely.
2017, 34(1):30-33.
DOI: 10.3969/j.issn.1673-9477.2017.01.007
Abstract:
The influences of different water cement ratios (0.40~0.50)and different replacement rates (0%~30%)of recycled brick grain on the workability and elastic modulus of the recycled concrete are investigated based on the slumps experiment and elastic modulus experiment of those concrete mixtures. The test results indicated that with the increase of content of recycled brick grain, the workability and the elastic modulus become bad under the condition of the same water cement ratio. And when the replacement rate of recycled brick grain is 30% and water cement ratio is 0.50, the descend range is equal to 17.62% for its elastic modulus. Based on the test results, the prediction model of the elastic modulus is proposed for the recycled concrete with brick grain.
The influences of different water cement ratios (0.40~0.50)and different replacement rates (0%~30%)of recycled brick grain on the workability and elastic modulus of the recycled concrete are investigated based on the slumps experiment and elastic modulus experiment of those concrete mixtures. The test results indicated that with the increase of content of recycled brick grain, the workability and the elastic modulus become bad under the condition of the same water cement ratio. And when the replacement rate of recycled brick grain is 30% and water cement ratio is 0.50, the descend range is equal to 17.62% for its elastic modulus. Based on the test results, the prediction model of the elastic modulus is proposed for the recycled concrete with brick grain.
2008, 25(3):15-18.
Abstract:
Taking a deep excavation in Tianjin for example,the numerical simulations are progressed under different excavation time and space basing on the numerical analysis software FLAC-3D in this paper.The measured data is compared and the changes of horizontal displacement of wall,supporting force,bottom soil upheaval,and bearing capacity of piles during excavation with time and space were analyzed
Taking a deep excavation in Tianjin for example,the numerical simulations are progressed under different excavation time and space basing on the numerical analysis software FLAC-3D in this paper.The measured data is compared and the changes of horizontal displacement of wall,supporting force,bottom soil upheaval,and bearing capacity of piles during excavation with time and space were analyzed
2008, 25(2):36-39.
Abstract:
Various modes of operational regulation in district heating simply were introduced.Relevant parameter models were educed aiming at 3 typical regulation modes.The concrete values of parameter models in operational regulation mode were calculated by taking a district heating project as example.Finally,some simple economic analyses for various regulation modes were carried out.According to these discussions,it was pointed out the difference between the regulation by changing temperature and by changing flux in district heating.The energy is supplied indirectly by district boiler;the regulation by change flux was proposed for the regulation by changing temperature and flux contemporary.
Various modes of operational regulation in district heating simply were introduced.Relevant parameter models were educed aiming at 3 typical regulation modes.The concrete values of parameter models in operational regulation mode were calculated by taking a district heating project as example.Finally,some simple economic analyses for various regulation modes were carried out.According to these discussions,it was pointed out the difference between the regulation by changing temperature and by changing flux in district heating.The energy is supplied indirectly by district boiler;the regulation by change flux was proposed for the regulation by changing temperature and flux contemporary.
2008, 25(2):72-75.
Abstract:
The GPS technology has many advantages such as round-the-clock,roboticized,liberty in selecting points,and capable of providing three-dimensional coordinates,so it provides a new and effective data collection method for landslide monitoring.The author mainly research the method of GPS technology used in landslide monitoring and give the all process according to researching landslide monitoring of Kaziwan landslide in Sanxia area,including technology design of monitoring network,field survey,data processing and deformation analysis.The results indicated that GPS static positioning technology reached the precision of mini-meter and fully meet the requirements of high-precision deformation monitoring.
The GPS technology has many advantages such as round-the-clock,roboticized,liberty in selecting points,and capable of providing three-dimensional coordinates,so it provides a new and effective data collection method for landslide monitoring.The author mainly research the method of GPS technology used in landslide monitoring and give the all process according to researching landslide monitoring of Kaziwan landslide in Sanxia area,including technology design of monitoring network,field survey,data processing and deformation analysis.The results indicated that GPS static positioning technology reached the precision of mini-meter and fully meet the requirements of high-precision deformation monitoring.
