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.
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.
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.
6 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.
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(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(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):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.
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.
2009, 26(1):69-71.
Abstract:
A new method for training the artificial neural network is presented.In this method,the genetic algorithm(GA),a general-purpose global search algorithm is used to train the network with updating the weights to minimize the error between the network output and the desired output.Then the back propagation(RP) algorithm is used to further train the artificial neural network.The method is used to speed up the convergence and improve the performance.Experiment shows that the GA-neural network prediction model is good prediction precision.
A new method for training the artificial neural network is presented.In this method,the genetic algorithm(GA),a general-purpose global search algorithm is used to train the network with updating the weights to minimize the error between the network output and the desired output.Then the back propagation(RP) algorithm is used to further train the artificial neural network.The method is used to speed up the convergence and improve the performance.Experiment shows that the GA-neural network prediction model is good prediction precision.
13 Using GIS and remote sensing to study soil erosion intensity in Baode mining area,Shanxi province
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.
2008, 25(4):86-88.
Abstract:
This paper introduces Leica HDS4500 three-dimensional laser scanning system and corresponding necessary software Cyclone Scan.The application of the system in geological engineering is elucidated by using factual examples.There is no doubt that Leica HDS4500 three-dimensional laser scanning system has largely potential application in engineering measuring and deformation monitoring in the field of civil engineering and geological engineering.
This paper introduces Leica HDS4500 three-dimensional laser scanning system and corresponding necessary software Cyclone Scan.The application of the system in geological engineering is elucidated by using factual examples.There is no doubt that Leica HDS4500 three-dimensional laser scanning system has largely potential application in engineering measuring and deformation monitoring in the field of civil engineering and geological engineering.
2009, 26(2):45-47.
Abstract:
The test on treating urban sewage in Handan has been continuing for a long-term by using the composite constructed wetland system,and the purification effect were discussed in autumn and winter.The results show that the removal rates of COD,TN,TP,SS are 65%,84%,80%,91%,in winter drop off to 25%,27%,65%,89%in autumn.The purification effect and stability of system have been raised during the serial secondary sub-series.
The test on treating urban sewage in Handan has been continuing for a long-term by using the composite constructed wetland system,and the purification effect were discussed in autumn and winter.The results show that the removal rates of COD,TN,TP,SS are 65%,84%,80%,91%,in winter drop off to 25%,27%,65%,89%in autumn.The purification effect and stability of system have been raised during the serial secondary sub-series.
2009, 26(3):19-21.
Abstract:
Based on the topology optimization of truss,the genetic algorithm(GA) was improved more efficient.In the design of size and topological structure of the truss,binary encoding,crossover and mutation for size and topology variables were adopted separately and the initial solution was gained,with the accuracy of the size variable coding properly reduced to speed up the convergence of the GA.In order to prevent trapping in local optimal solution,a portion of initial solution was added to the new parents,and then the size of section was recoded and the final solution was searched in a better precision.Examples show that the method is effective to the topology optimization design of truss structures with discrete variables.
Based on the topology optimization of truss,the genetic algorithm(GA) was improved more efficient.In the design of size and topological structure of the truss,binary encoding,crossover and mutation for size and topology variables were adopted separately and the initial solution was gained,with the accuracy of the size variable coding properly reduced to speed up the convergence of the GA.In order to prevent trapping in local optimal solution,a portion of initial solution was added to the new parents,and then the size of section was recoded and the final solution was searched in a better precision.Examples show that the method is effective to the topology optimization design of truss structures with discrete variables.
2009, 26(3):97-101.
Abstract:
Based on the analysis of the water sample and integration of karst groundwater data,this paper analyzes the hydrogeochemical and geothermal characteristics of the hot karst water and its genesis in the western Cizhou coalfield.The results show that the deep karst warm-hot water in Ordovician under the coalbearing strata is SO4Cl-CaNa type water with high TDS and high hardness,and its formation is derived from the deep seepage of groundwater along faults and long time evolution;the geothermal abnormity is water-heated geothermy with more than 60°C temperature of heat storage and 1500m depth of circulation,and the heat source is from the thermal addition of igneous rock mass intruding in Yanshanian over the regional normal geothermy.The research provides some reference in geothermal research,coal exploitation,prevention of thermal damage and mine water damage.
Based on the analysis of the water sample and integration of karst groundwater data,this paper analyzes the hydrogeochemical and geothermal characteristics of the hot karst water and its genesis in the western Cizhou coalfield.The results show that the deep karst warm-hot water in Ordovician under the coalbearing strata is SO4Cl-CaNa type water with high TDS and high hardness,and its formation is derived from the deep seepage of groundwater along faults and long time evolution;the geothermal abnormity is water-heated geothermy with more than 60°C temperature of heat storage and 1500m depth of circulation,and the heat source is from the thermal addition of igneous rock mass intruding in Yanshanian over the regional normal geothermy.The research provides some reference in geothermal research,coal exploitation,prevention of thermal damage and mine water damage.
18 Theoretical study on division of coal spontaneous combustion zone in fully mechanized caving face
2009, 26(4):76-78.
Abstract:
Basing on theory of coal spontaneous combustion,this paper analyzes the coal spontaneous combustion occurrence zone in fully mechanized caving face,and puts forward the "U"-sharp-area of spontaneous combustion in gob.The three zones easy-combustion are redivided into strong permeate zone,weak permeate zone and suffocative zone according to the degree of strength of air flow.Moreover,a new concept "easy-firing area" is proposed on the basis of high-rate spontaneous combustion characteristic in the cross of "U"-sharp-area and weak permeate zone.Technical measures are given for fireproof in fully mechanized caving face in the future accordingly.
Basing on theory of coal spontaneous combustion,this paper analyzes the coal spontaneous combustion occurrence zone in fully mechanized caving face,and puts forward the "U"-sharp-area of spontaneous combustion in gob.The three zones easy-combustion are redivided into strong permeate zone,weak permeate zone and suffocative zone according to the degree of strength of air flow.Moreover,a new concept "easy-firing area" is proposed on the basis of high-rate spontaneous combustion characteristic in the cross of "U"-sharp-area and weak permeate zone.Technical measures are given for fireproof in fully mechanized caving face in the future accordingly.
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(4):1-3.
Abstract:
The rebound formula of the viscoelastic damper at any time is received through the anlysis of mechanical properties of viscoelastic damper.Relative displacement formula of differ-rigidity viscoelastic brace is deduced by using the model of three-differ-rigidity available.As well as the braces are applied into the high-level steel structure system.The result of finite element of systerm with viscoelastic damper illustrate that the ability of dissipative energy is remarkable.
The rebound formula of the viscoelastic damper at any time is received through the anlysis of mechanical properties of viscoelastic damper.Relative displacement formula of differ-rigidity viscoelastic brace is deduced by using the model of three-differ-rigidity available.As well as the braces are applied into the high-level steel structure system.The result of finite element of systerm with viscoelastic damper illustrate that the ability of dissipative energy is remarkable.
