Abstract:A new kind of transparent rock-like materials was developed for studying crack propagation inside instated of rail rock. It that have artificially induced internal cracks was tested under uniaxial compression. This experiment observed the overall process of the pre-test specimens fractured completely destroyed, analyzed each stage of the presentation of the crack propagation characteristics carefully and summarized the law of pre-crack damage the specimen. The experiment studied the effect of different lengths of fissure on basic physical and mechanical parameters;obtained the greater the crack length, uniaxial compressive strength and elastic modulus of the specimen are lower conclusions. These studies have important guidance for the early warning of geotechnical engineering works.

Abstract:The author uses the rigid and flexible loading method,respectively for pressure box calibration of coarse-grained soil,which is the first sand pressure calibration method and the second sand pressure calibration method,and designed a new methods of pressure box calibration of coarse-grained soil which is the first sand pressure calibration method comparing with them.Study found that except that the first sand pressure calibration method obviously can not be applied to practical because of the high discrete rate of the calibration curve,the second and third sand pressure calibration method have a low discrete rate of the calibration curve,which can meet the accuracy of laboratory test and engineering application requirements.Then,through the large compression experiment in door,the author study applicability of the second and third sand pressure calibration method and water pressure calibration method that manufacturers provide and the author have improved,The results show that,the second sand pressure calibration method and improved water pressure calibration method are applicable to the count of soil pressure.

Abstract:By using the GDS dynamic triaxial tests on Zhoushan Daishan marine soil,a series of strain control dynamic triaxial tests have been performed.Change of hysteretic loops character of Zhoushan marine soil under different strain amplitude has been studied,a method of using hysteretic loops to construct the backbone curves is found.As well as doing fitting curves and analyzing according to experiment datum.The datum were simulated by three modules,such as Hard-Drnevich model,modified Hard-Drnevich model and Martin-Darvidenkov model.To get the backbone fitting curves,the accuracy of the numerical simulation and parameter sensitivity of different modules with varying confine pressures have been analyzed.Results show that Hard-Drnevich model cannot fitting well for it cannot reflect Zhoushan marine soils Strain softening.While modified Hard-Drnevich model and Martin-Darvidenkov model can fit datum well.In view of the parameter sensitivity and accuracy,modified Hard-Drnevich model is suggested to be used to simulate Zhoushan marine soils,parameters gained by this article has some significance for civil engineering.

Abstract:Study failure characteristic of rocks under unloading confining pressure conditions from the released elastic strain energy is of great significance.Firstly,unloading confining pressure test maintaining constant axial deformation was carried out by using MTS815 electric hydraulic servo control tester.Secondly,the sandstone deformation,strength,elastic modulus,and energy variation during unloading confining pressure were analyzed by according to unloading confining pressure test data.The results show that with the confining pressure decreases,rock samples occur laterally continuous expansion;modulus of elasticity almost no change in the initial stages and significantly lower after crossed the failure point;axial stress decreases,showing a non-linear characteristic,releasable elastic strain energy increases more slowly in the initial stage,when the confining pressure reduced to a certain extent increases rapidly.Finally,based on the release of elastic strain energy theory deduce the failure criterion of rock unloading confining pressure.The whole failure criterion of loading rock under unloading confining pressure,which was U₀^e,was concluded.

Abstract:In this paper,based on the measured data from section EX-5 of Vietnam Hanoi - Hai Phong expressway and by using ABAQUS software,the soil consolidation settlement process was simulated by the method of drain with pre-loading.We made the genetic algorithm combine with ABAQUS software and wrote genetic algorithm-ABAQUS back analysis program to solve the shortcomings of the numerical simulation method.Then this paper compiled the genetic algorithm -ABAQUS back analysis program,which was verified by application examples.The comprehensive researches show that: (1).The sensitivity of deformation modulus and poisson's ratio in constant load is greater than the sensitivity of preloading.(2).The final settlement of inversion calculation is close to the actual settlement.The relative error is within 10%.This shows that the parameters of the anti - performance parameters of the ABAQUS- genetic algorithm are effective.In engineering,it is feasible to predict the subsidence by using this method.

Abstract:In this paper,nonlinear analysis of welded beam-column connection with different weld access holes under cyclic loading were performed,with the objective of gaining a better understanding of the effect of different weld access holes on inelastic behavior of connections.The different FEMs employed in this research were derived by changing the shape and size of weld access holes.The ductility of connection subassemblies with different weld access holes was measured in terms of several mechanical parameters sampled at the root of weld access hole.Results indicate that connections with the weld access holes recommended by "Code for seismic design of buildings" in China produce relatively the maximum accumulated plastic strain while the weld access holes recommended by FEMA have the highest stress triaxiality ratio.The conclusion drawn from this paper is verified by experimental data available in the literature.

Abstract:Stability analysis of the slope has been finished by global and local strength reduction method.For a homogeneous soil slope,calculation has been done firstly by global strength reduction method,so two reduction regions were adopted,one was greater plastic shear strain rate than 2.0e^-5 and the other was plastic flowing region,the sliding surfaces and the safety factors of slope were achieved by local strength reduction method,and the changing rule of the safety factors and the displacement of key points and the slip zone under different reduction scopes were analyzed.The results from the global strength reduction and the local strength reduction under the condition of the natural condition and steady seepage condition were compared with each other.The results showed that safety factors were almost the same,but the reduction region effected calculation results were significant,the stability safety factor by the reduction range of greater plastic shear strain rate than 2.0e^-5 was smaller.The results can provide reference for selecting the appropriate reduction regions with finite element strength reduction method.

Abstract:Rheological properties of pressure-type anchors are studied by the pulling-out test of anchorage system in laboratory. The anchorage system is well designed and produced. The test data is reliable and is in line with scientific laws. By designing with the different fixed anchor lengths and mortar strengths, the test studies that the displacements change over time along the axial direction under different load. Compare deeply the different strength of mortar and the different anchorage length on the anchoring effect. It concluded that the fracture of the grouting body whose length is 300 mm reinforcement, the destruction of the specimen whose grouting body's length is less than 300 mm is on the second interface of anchorage;when the concrete strength is small, if the radial stress increases to a certain value, the matrix was to crack in the first.

Abstract:he law of the retaining structure were observed through the actual monitoring data and the results of the finite element software simulation contrast analysis. The effect different capacity of the underground continuous wall of on the horizontal displacement of retaining structures was simulated by using finite element software. Top horizontal displacement of the underground continuous wall at the bottom of the maximum horizontal displacement and horizontal displacement with different embedded depth of underground continuous wall formation change curve are available mathematical model y=a/x+b to simulate.

Abstract:According to the monitoring data packets Suzhou Metro Line Creek Road Station, the excavation monitoring data obtained during excavation was analyzed, it is found that there exhibits similar changes even wall parabola with significant temporal effect law;when the base plate and the structure of the beam plate are formed, the structure of the retaining structure is effective. With the increase of excavation depth, the surface subsidence increases, the form of settlement in the field is "settlement trough". With the increase of the weight of the structure, the elastic zone of the base plate is limited and a small amount of compression deformation is generated, and the whole wall of the earth wall is sinking, and the end is stable. The longer the envelope of exposure, the greater the change in the pit of ground settlement, it is found the steel support axial force is not monotonically increasing or decreasing, but the state changes repeatedly leaping forward, which is consist with the construction process, temperature changes, strut stress factors.

Abstract:expansive soil;moisture content;dry density;swelling pressureIn order to further study of the law development of expansive soil expansion force, load balance method is used to study the Nanjing expansive soil vertical expansion force changing with time, initial moisture content, and dry density. The results show that the smaller the initial moisture content of expansive soil sample, the bigger the dry density is, the faster the expansion rate is;Expansion force decreases with the increase of initial water absorption, The expansion force and water content of expansive soil samples are linear. The expansive force increases with the increase of dry density, and there is exponential function between expansion force and dry density of expansive soil sample.

Abstract:In order to analyze the law of ultimate bearing capacity of the pile and numerical simulation studies to improve the bearing capacity factors,the finite element analysis software ABAQUS is used by combining with the investigation data of actual project,selected of pile and soil mechanics parameters is selected suitably and numerical simulation of the static load test of single pile is carried out.The simulation results show that through reasonable choice pile of soil mechanics parameters,simulation Q~S curves and filed measured values are well.This indicated that the use of ABAQUS finite element analysis software simulation to pile static load test is feasible.At the same time,it is beneficial to improve the ultimate bearing capacity of single pile through analyzing the effects of different coefficient of friction μ on bearing capacity.Therefore,mainly by the friction of the pile side from the pile top is transferred to the pile end bearing capacity limit friction pile;axial force transmission gradually decreases from top to bottom;changes of soil pile interaction but also to improve the ultimate bearing capacity of pile method.

Abstract:For one embankment built by toe-shooting method at deep mud foundation,drilling and geophysical method were used for detecting the replacement effect,then settlement of the embankment were observed and ultimate settlement was predicted by Verhulst model based on the observed data,finally,the settlement calculation method of embankment was established,and was used the settlement of the embankment.The results show that,there is a certain kind of stone-mud mixed layer and pure mud layer at the bottom of this kind of embankment,and the two layers results in a longer time to consolidate and larger settlement;the settlement of the embankment undergone 5 months to be stable,with ultimate settlement between 1366-1556mm;the settlement of embankment is induced by the compression of stone-mud mixed layer,mud layer and silt clay layer,and the total settlement by calculation and prediction are close.

Abstract:In order to study the process of water movement in soils affected by temperature difference, the indoor sand column simulation experiment was carried. In this paper, there are two groups of different temperature of sand column capillary water rise tests. Through experimental phenomenon and data collected to analyze the change law of aeolian sand rising height of capillary water with time, besides the relationship between rising heights of capillary water with temperature. In addition the movement mechanism of the capillary water rise was discussed. The test results show that, in external condition of the same circumstances, the higher temperature can accelerate the migration rate of the wetted front. However, the local high temperature can inhibit the upward migration of water, but the temperature effect is not obvious.

Abstract:The effect of different fineness of limestone powder on the properties of cement concrete were studied. The results show that the fine grinding of limestone powder make cement standard consistency water drop slightly and shorten the initial setting time and final setting time, and make the concrete mixture slump increase, and could increase liquidity and plasticity of mixture;Measurement results of different age concrete block show that the compressive strength of ground limestone powder increase the strength of concrete, and with the increase of the limestone powder fineness, the compressive strength of concrete block value increase.

Abstract:In hydraulic and civil engineering, gradually actual seepage analyses exceed the upper limit of Darcy's law. More and more problems should be considered on the influence of non-Darcy flow. The mechanism and numerical solution of non-Darcian flow were discussed in this paper. Then, the Forchheimei's non-Darcy flow was regarded as the research object to establish calculation model of dam. The high ordered item was studied for the influence of non-Darcy flow analysis. The law of Forchheimei's non-Darcian flow based on the variation of parameter b was discussed and summarized. The importance of non-Darcian flow analysis and the further research direction were proposed.

Abstract:The bridge monitoring system consists of a large amount of sensors,and there are likely to be some similarities among the data collected by different sensors.To figure out the similarity relations,a pattern-shape distance based similarity measurement approach was proposed.Firstly,the monitoring time series was divided into several patterns according to the morphological characteristics.Secondly,similarity discrimination based on the difference of dynamic change trend of each pattern shape was discussed,and the distance function of each discrimination result was defined.Thus,the pattern shape distance of different monitoring points could be calculated.On this basis,similarity analysis of monitoring points on Yufeng Bridge was discussed by means of hierarchy clustering.The clustering result shows good consistence with bridge real states.The similarity analysis of monitoring points provides the potential of deeper information mining of bridge structures and scientific basis in sensor troubleshooting and discrimination of abnormal data.

Abstract:In view of the predicting of the multi-arch tunnel deformation based on Gray system theory, and basing on taking Tian'e tunnel as a research background,this paper builds the grey prediction model〔GM(1,1)〕combining with the software of MATLAB to predict the settlement of the multiple- arch tunnel for analysis, and the predicted result are analyzed and compared with field monitoring results, it is found that both the numerical values are close. The results show that the values of the horizontal displacement and early vault settlement of the tunnel, which inputs the GM (1,1) model, can accurately predict the future value of surrounding rock deformation in a short time, and select the appropriate order for the model will improve prediction accuracy, In addition, this prediction model might be applied in dynamic design of foundation pit and information construction.

Abstract:Taking Dushu Lake Campus of Soochow University as an example, through the calculation of daylight factor and Ecotect simulation, the indoor light environment analysis were carried out by using the method of investigation, instrument test, Ecotect numerical simulation, statistical analysis and so on. The effects of different materials and lighting form on indoor light environment were studied by according to comparative analysis of data .In order to get the right interior daylight factor, we should choose light-colored walls and the top surface, architects should not add too much decorative lines when we design the facade, window's shape, size, position level should be based on the size of the interior space, the shape and the height.

Abstract:This paper studies the relationship between the structure, hardness and wear resistance about the Cr26 high chromium cast iron after different heat treatment. The experimental results show that the optimum quenching process is 1050℃ by air cooling after 60 minutes, the hardness can reach HRC 64.2.The higher the hardness of the material, the better wear resistance;The microstructures and wear mechanism are analyzed.

Abstract:Bidding information is not all clear in the hydraulic engineering bid evaluation,so we undertook two steps to solve the above problem.First,according to the index system commonly used in bidding evaluation of hydraulic engineering,the weight of each evaluation index was determined by Delphi method.Second,the Interval intuitionistic fuzzy matrix is established,then selected the optimal from the alternatives by calculating the value of compound distances between alternatives and positive and negative ideal solutions,by means of applying the concept of weighted Hamming distance.This method makes the evaluation information quantitative,reducing errors due to subjective factors,so the results will be more objective and accurate.Through a hydraulic project example to illustrate the application of the method,the result is that the best solution is A4 and the worst is A1,showing that this model works for hydraulic engineering were optimized for each bidding evaluation program objective,reasonable and effective.

Abstract:In view of the complex structure in the study area,tectonic position and tectonic zone with more display abnormal gas and coal and gas outburst (spray) of multiple,prone to wait for a characteristic.By applying theory of gas geology,the control of structure to coal seam gas occurrence and gas outburst (spray) and its regulation were studied.Studies show that "closed" compressional and shear structure of coal seam gas pressure preservation provides a good "sequestration effect", which is important factor to control the area of coal seam gas content being high and uneven distribution;Construction type,nature and combinations jointly control seam gas partition,zoning and sudden coal and gas (spray) the scope and probability.

Abstract:Under different confining pressure,triaxial compressive strength of Maokou limestone is tested by MTS 815 test system.By calculating data,the fracture strain figure is painted and crack initiation stress and crack failure stress are obtained,it shows that: with the increase of confining pressure,three stress thresholds increase,the period of unstable crack growth is longer than uniaxial compressive strength,crack propagation is limited under confining pressure.Under the same confining pressure,circ strain is larger than axial strain,circ strain grows quickly when axial force over crack initiation stress,a sharp increase in circ strain when axial force over crack failure stress,the circ-axial stress strain curve can reflect three stress thresholds.

Abstract:For studying the general rule of Jiangxi's coalmine accidents, the accidents in Jiangxi's coalmine from the year 2004 to 2014 were collected and organized. The statistical analysis method was used to discuss all of the 477 cases of coalmine accidents. They was analyzed comprehensively by according to years, months, times, accidents type and ownership. The results show that coalmine accidents are highly occurred in 2004. The major accidents often occurred in these months: April, May, and August. 8:00~19:59 time period is a high incidence of accidents. The roof accident frequency is the highest in all types of accidents. Gas accidents with an average death 5.3 people is highest. Township coal mine accidents is the maximum number. In different ownership mines, township coalmine need key management.

Abstract:Taking XinYang coal mine for an example, water samples was obtained from different aquifer, the component of characteristics ion of each aquifer were studied by using clustering analysis method. The underground gushing bursting water layer and water supply were analyzed by using SPSS statistical software. The results showed that the source of water in uncertain aquifer was Karst fissure water in the Ordovician. This method is simple and easy to learn, and the investment is little, the effect is good.

Abstract:In order to verify the feasibility of surveying topographic map with UAV images in mining area,this paper has taken the updates of basic topographic map of mining area of Jizhong Energy Handan Mining Group Taihang Mining Co.Ltd.for example and have practiced a set of aerial photogrammetry methods of large-scale topographic map,and have analyzed aerial triangulation and mapping accuracy.The plane precision of checkpoints are all within 0.25m,and there are 80.1% elevation points which are less than the standard error.The topographic map has met the needs of production operations of mining area.

Abstract:Combined with the characteristic of projects,this paper establishes evaluation index system with five first class indicators such as green construction management,environmental pollution,relative technology and fifteen second class indicators.This paper proposes the evaluation method based on AHP-MF.AHP is used to calculate the weight of each indicator.MF is used to evaluate the results.The method is applied to a project,and the results show that it is feasible.