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Zuo D.-J.,Tianjin Research Institute for Water Transport Engineering | Zuo D.-J.,Hohai University | Shi L.,Shenzhen Geotechnical Engineering Co. | Li M.-M.,Tianjin Research Institute for Water Transport Engineering | Ji W.-D.,Tianjin Research Institute for Water Transport Engineering
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2014

Based on the deep excavation of the building of Shenzhen Branch of China Merchants Bank, considering the interaction between soils and tunnel linings, the impact of excavation on the adjacent subway tunnels is studied by using the finite element software ABAQUS. The calculated results indicate that the influence of foundation excavation on the adjacent subway shield zone is small, and the surface settlement and displacement of values linings are in the limited range. The surface settlement and tunnel lining displacement become larger with the deeper excavation, which have a higher growth rate with the larger distance between the inner support. The horizontal displacement of tunnels is significantly lower than that of the retaining piles considering the interaction between soils and linings. Therefore, the pipe-soil interaction should be considered when analyzing the impact of excavation on large-diameter pipes. Source


Wu Z.-G.,Shenzhen Geotechnical Engineering Co. | Zhang H.,China Three Gorges University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2012

The quasi-saturated soil is defined as a soil with entrapped air and saturation close to 100%. A series of one-dimensional ponded water infiltration tests are designed and conducted in laboratory. The influence factors of entrapped air content in the quasi-saturated soil, such as soil types, dry density and the initial water content, are studied. The influence mechanisms are analyzed and discussed. The results show that the volume of entrapped air decreases as dry density increase; the escape of entrapped air is more difficult when the initial water content increases above a critical water content; the escape ratio of entrapped air in sand is smaller than that in clay because of the relatively longer time to reach stable state of infiltration for the clay. Some physical phenomena in real soil infiltration are shown. The results provide test data for better understanding of soil infiltration process and numerical modelling. Source


Liu H.-S.,China Earthquake Administration | Nian T.-K.,Dalian University of Technology | Wan S.-S.,Shenzhen Geotechnical Engineering Co.
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2010

Boundary constraint condition is one of the most important influencing factors in 3D stability analysis based on shear strength reduction finite element method(SSR-FEM). A typical three-dimension slope case is adopted to study safty factor and potential sliding surface under various boundary constraint conditions, and their difference is discussed. Then, the results of a 3D slope case with soft interlayer and groundwater are illustrated using SSR-FEM. The results indicates that the boundary constraint conditions have a remarkable effect on the slope stability, the fixed constraint in three directions effect is the largest one, free constraint effect is the smallest one. Moreover, the boundary constraint conditions have also a certain effect on the potential sliding surface of three-dimensional slope. The effect is related to the ratio of length and height for the slope. When the ratio of length and height for the slope is larger than 8 (L/H > 8), the location of slip surface and out-slip points in 3D slope is very similar to that from 2D plane strain analysis. So the ratio of L/H=8 can be taken as the limit point for 2D and 3D stability analysis in SSR-FEM. Source


Nian T.-K.,Dalian University of Technology | Nian T.-K.,CAS Wuhan Institute of Rock and Soil Mechanics | Wan S.-S.,Dalian University of Technology | Wan S.-S.,Shenzhen Geotechnical Engineering Co. | And 2 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

The transient unsaturated seepage in soil slope is systematically investigated; and the stability of a slope is analyzed by shear strength reduction finite element method (SSR-FEM). Emphases are given to discuss the influence of location of phreatic surface, soil permeability, drawdown ratio, drawdown rate and matric suction subjected to transient unsaturated seepage on the slope stability. The results show that the drawdown rate has a remarkable effect on the pore-pressure in high permeability soil slope than that in low permeability one; and also a significant effect over 15% on the safety factor of a slope can be also drawn. Source


Wan S.-S.,Dalian University of Technology | Wan S.-S.,Shenzhen Geotechnical Engineering Co. | Nian T.-K.,Dalian University of Technology | Nian T.-K.,CAS Wuhan Institute of Rock and Soil Mechanics | And 2 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

Some problems have not still been solved smoothly in slope stability analysis using shear strength reduction finite element method (SSR-FEM) until now. The effect of mesh shape, size and order on the factor of safety is systematically discussed at first; triangular second-order element is thought to be the optimal one, as it can be able to both simulate the failure process of slope and obtain the accurate solutions during the relative element size from 0.1-0.15. When a slope arrives at the critical failure state by SSR-FEM, the four failure criteria as plastic zone extension from the toe to the top of slope, equivalent plastic strain exceeding a certain value developed along the potential slip surface, uncontrollable increase in characteristic nodal displacement on slope surface; and the iteration non-convergence of nonlinear FEM numerical calculations can be found in turn. Calculation results show that the four evaluation criteria are highly consistent. Location of potential slip surface and out-slip point is associated with cohesion, internal friction angle and slope angle. The bigger cohesion, smaller friction angle or the lower slope angle can make slip surface deepen, and the out-slip point is far from the slope toe. Source

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