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Xiong L.,Ningbo University | Yu L.,Zhejiang Geotechnical and Foundation Companay | Yang C.,Wuhan Surveying Geotechnical Research Institute Co.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2015

The shear creep curve of hard structural surface was analyzed by using generalized Kelvin model, Burgers model and six-component rheological model, respectively. The interface element in FLAC3D was improved. The shear rheological model and numerical analysis method of shear creep test of hard structural surface were put forward. The research result shows that the six-component viscoelastic shear rheological model is appropriate for analyzing the shear creep property of hard structural surface. The shear creep deformation increases with increasing slope ratio if the slope ratio is smaller than 45°, while the result will be quite on the contrary if the slope ratio is higher than 45°. In addition, the shear creep deformation will increase with increasing shear stress under fixed normal stress, and the shear creep deformation will decrease with increasing normal stress under fixed shear stress. ©, 2015, Academia Sinica. All right reserved.


Guo P.,Hohai University | Guo P.,Wuhan Surveying geotechnical Research Institute Co. | Lin S.,Yangtze River Scientific Research Institute
Applied Mechanics and Materials | Year: 2012

DDA(Discontinuous Deformation Analysis) was used to study the mechanical characteristics of coarse granular material (CGM). The numerical simulation model was found consulting the two Dimensional test of CGM,and the stress-strain curves obtained by the numerical simulation were basically in agreement with the results of laboratory test. It indicates that the numerical simulation is suitable for the mechanical characteristic research of CGM. In addition,the distribution statistic of several fabric elements about interaction between particles was also presented. Some relation between the stress-strain and fabric element change are found after analysis. © (2012) Trans Tech Publications, Switzerland.


Guo P.,Hohai University | Guo P.,Wuhan Surveying geotechnical Research Institute Co.
Applied Mechanics and Materials | Year: 2012

The landslide which located in the northwest of the transformer substation was studied and the evaluation of the stability was contained.Through analyzing the regional geological conditions and landslide engineering conditions, summary of the reason of the landslide was made. Based on two-dimensional rigid body limit equilibrium theory, residual thrust method was used in calculation. Through the researching of the landslide, some factors that play important role were found. According to the investigation report, select the main slip profile as the basis for calculating. Combining with soil C&f, the value of the inversion parameters can be got. Calculation process contained two engineering conditions. In the natural condition, the landslide is stable, and in the rainstorm condition, the landslide is not stable. © (2012) Trans Tech Publications, Switzerland.


Xiong L.,Ningbo University | Xiong L.,Chengdu University of Technology | Li T.,Chengdu University of Technology | Yang C.,Wuhan Surveying Geotechnical Research Institute Co. | Yu L.,Zhejiang Geotechnical and Foundation Company
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2013

Taking the interlayered rock mass composed of greenschist and marble as study subject, numerical analysis on uniaxial and biaxial compression creep tests of interlayered rock mass was done by FLAC3D. Lots of influencing factors such as geometric relationship between loading direction and layer, volumetric content of marble interlayer and stress level were taken into account in the numerical analysis. The research results show that the absolute values of axial strain and strain in the incline direction of interlayer increased firstly and then decreased when the dip angle of interlayer increased from 0° to 90° under uniaxial and biaxial compression states. Axial compressive deformation and dilatant deformation in the two lateral directions decreased with the increased volumetric content of marble interlayer under uniaxial and biaxial compression states. The axial compressive deformation when axial loading orientation was perpendicular to bedding plane was larger than that when axial loading orientation was parallel to bedding plane under uniaxial compression. The axial compressive deformation was the largest when axial loading orientation was perpendicular to bedding plane and lateral loading orientation was parallel to bedding plane, and was the smallest when axial loading orientation was parallel to bedding plane and lateral loading orientation was perpendicular to bedding plane.


Liangfu X.,Xinjiang University | Jiangtao C.,Wuhan Surveying Geotechnical Research Institute Co.
Electronic Journal of Geotechnical Engineering | Year: 2016

To calculate mechanical parameters of soil property in a certain region based on cone penetration test (CPT) parameters, the paper surveyed clay, silty clay, silty soil and silty sand of holocene alluvial layers in the Yangtze River Delta; through comparative analysis between CPT parameters and screw plate load test, plate load test, shear test and compression test, it verified CPT data as evaluation index for predicting mechanical parameters of soil property. Based on this, backpropagation (BP) neural network was applied to construct a prediction model for the study of the CPT data and mechanical parameters of holocene alluvial layers in the Yangtze River Delta. The model was run to calculate the mechanical parameters of soil layers obtained from CPT boreholes of the stock yard of Chendou Tianfu Port Limited Company. The results show CPT data is reliable in predicting the mechanical parameters of the soil property of holocene alluvial layers in the Yangtze River Delta. The BP neural network model for mechanical parameters is fairly accurate for the prediction. It is demonstrated that applying BP neural network based on CPT meets the practical engineering requirement of holocene alluvial layers in the Yangtze River Delta. © 2016 ejge.


Zhang G.-J.,Wuhan Surveying geotechnical Research Institute Co. | Yao X.-B.,Wuhan Surveying geotechnical Research Institute Co. | Hu J.,Wuhan Surveying geotechnical Research Institute Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2014

Based on the foundation pit project of a metro transfer station, the changing laws of the axial forces of struts with the excavation time are studied. A three-dimensional finite element model is established to numerically simulate the foundation pit of the metro station. The FEM and in-situ monitoring results of axial forces of struts are compared. The results show that the axial forces of the fourth concrete strut are the maximum, and the design values of the fifth and the sixth steel struts are conservative. Besides, the removal of a strut has a notable influence on its adjacent struts. The calculated results are less than the in-situ monitoring ones, but the trend of their changing laws is almost uniform. The three-dimensional finite element model can simulate the excavation process of abnormal foundation pits, and it can be used to provide reference for their design and construction.


Liu Y.,University of Science and Technology Beijing | Li X.-Z.,Wuhan Surveying Geotechnical Research Institute Co. | Wu S.-C.,University of Science and Technology Beijing
Yantu Lixue/Rock and Soil Mechanics | Year: 2014

Six typical shapes of rockfill were selected and simulated by clusters of round particles. Two kinds of contact constitutive models were adopted to establish multi-shape numerical model of rockfill. The process of particles crushing under vibration compaction was simulated and the mechanism of crushing was discussed. A quantitative calculation method of crushing was proposed, which can be used to analyze the variation of grain size distribution curve before and after particle crushing. The effect of different contact constitutive models on the numerical results was also discussed in detail. The numerical results indicate that the tensile cracking is dominated and the shear failure zone appears only after several numbers of vibration rolling compaction. Although the crushing ratio calculated from the proposed quantitative calculation method results is higher than the test data for the large particles; the grain size distribution curve predicted from the numerical method has a good agreement with the test results on the whole. The predicted results from the numerical models of parallel-bounded law are more rational than that from the contact bounded model. The numerical results from the 6 shapes models indicate that the crushing ratio decreases with the increasing of shape coefficients. The rectangular particles are more fragile than other shapes. These study results of different particle shapes indicate the numerical model consists of 6 different shapes are more rational than pure round particles or single non-round particles. ©, 2014, Academia Sinica. All right reserved.


Liu Y.,University of Science and Technology Beijing | Li X.Z.,Wuhan Surveying Geotechnical Research Institute Co. | Wang C.L.,University of Science and Technology Beijing
Applied Mechanics and Materials | Year: 2013

Numerical simulation was conducted to study the particle breakage of rock in rolling compaction (RC) test based on discrete element method (DEM). Different shapes of particles were formed to represent the real particle shape. A quantitative analysis method of particle breakage was proposed according to the grading curve before and after compaction. The numerical results had a good agrrement with the field test, which indicated that the method adopted in this paper was feasibile and could consider the influence of the particle shape on the particle breakage in RC test. © (2013) Trans Tech Publications, Switzerland.


Liu Y.,University of Science and Technology Beijing | Wang Y.T.,Wuhan Surveying Geotechnical Research Institute Co. | Li X.Z.,Wuhan Surveying Geotechnical Research Institute Co.
Applied Mechanics and Materials | Year: 2013

Based on the rolling compaction (RC) test of the Nuozhadu coarse rockfill zone of upstream and downstream I district rockfill engineering, numerical simulation was conducted to study the particle breakage of RC test using discrete element method (DEM). The movement and the crushing mechanism of the particles in the RC process were analyzed according to the numerical results of DEM. The numerical results indicated that the dominant damage were tension failure. The crushing zone was approximate inclined 45 degrees to horizon direction and extended to the bottom in the RC process. © (2013) Trans Tech Publications, Switzerland.


Wang H.-Y.,Wuhan Surveying Geotechnical Research Institute Co. | Yao X.-B.,Wuhan Surveying Geotechnical Research Institute Co. | Zhang Y.,Wuhan Surveying Geotechnical Research Institute Co. | Hu J.,Wuhan Surveying Geotechnical Research Institute Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2014

The pile-anchor supporting structures have been widely used in deep foundation pits. The supporting structures of single pile-anchor and double-row piles are used in the same deep foundation pit. The influence of deformation behaviors of the excavation and adjacent buildings are analyzed based on the monitoring results. The influence on the adjacent buildings is also described because of construction of anchor cables. In addition, the influence scope of horizontal deformation of the excavation is analyzed.

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