Shanxi Traffic Science Research Institute

Taiyuan, China

Shanxi Traffic Science Research Institute

Taiyuan, China
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Niu Q.-Y.,Taiyuan University of Technology | Liu J.-J.,Taiyuan University of Technology | Zhang M.,Taiyuan University of Technology | Liu S.-W.,Shanxi Traffic Science Research Institute
Gongcheng Lixue/Engineering Mechanics | Year: 2011

In the paper, the liquefiable sand soil non-improved and improved by gravel piles under earthquake action is numerically simulated by using the three-dimensional finite difference program 'FLAC3D' (Fast Lagrangian Analysis of Continua), and a model to analyze seismic response is established in order to investigate the results of liquefiable sand soil reinforced by gravel piles. According to the analysis of the numerical simulation, the gravel piles confirmed have remarkable drainage effect. Compared with the result of shaking table tests, it is demonstrated that the test of Numerical simulation is reliable.


Niu Q.-Y.,Taiyuan University of Technology | Li R.-K.,Taiyuan University of Technology | Xu Z.-J.,Taiyuan University of Technology | Xu Z.-J.,Shandong Water Conservancy Survey and Design Institute | Shen J.-M.,Shanxi Traffic Science Research Institute
Gongcheng Lixue/Engineering Mechanics | Year: 2012

With simulation seismic loads in a laboratory, the vibration table experiment of the liquefied soil improved by soil-cement piles are carried on. a variety of pore water pressure of non-improved and improved soil under the same buried depths and different dry density is utilized to discuss liquefaction effects of soil-cement pile at different dry density. It is revealed that the drainage effects of soil-cement piles is not evident and the liquefaction effects of is not considerable. It should be carefully chosen in engineering applications.


Niu Q.-Y.,Taiyuan University of Technology | Liu J.-J.,Taiyuan University of Technology | Liu S.-W.,Shanxi Traffic Science Research Institute | Zhang M.,Taiyuan University of Technology | Guo Y.,Taiyuan University of Technology
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011

Natural liquefiable sandy ground and liquefiable sandy ground improved by gravel piles and soil cement piles under earthquake action are numerically simulated by three-dimensional finite difference program "FLAC3D" (Fast Lagrangian analysis of continua), and anti-liquefaction characteristics of gravel piles and soil-cement piles in improving the liquefiable sandy ground are studied. The analysis shows that the gravel piles have remarkable effect to resist liquefaction, while the cement-soil piles have limit effect to resist liquefaction. It is also confirmed that the resisting liquefaction effects and the drainage effects of pile-soil are directly correlative.


Niu Q.-Y.,Taiyuan University of Technology | Liu F.,Taiyuan University of Technology | Guo Y.,Taiyuan University of Technology | Liu S.-W.,Shanxi Traffic Science Research Institute
Gongcheng Lixue/Engineering Mechanics | Year: 2013

The three-dimensional finite difference program FLAC3D (Fast Lagrangian Analysis of Continua) is used to establish the model of the improved foundation soil by cement piles and to analyze seismic response. From the point of the numerical analysis, it adopts a visualized way to make a systematic analysis about the vertical displacement, the excess pore water pressure, the pore pressure ratio, the shear strain increment, the shear stress on interface elements and the surface acceleration. It helps us to obtain some valuable conclusions by summarizing the changing patterns of above parameters. It has definite instruct meaning for practical projects in the future.

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