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| MODEL TEST AND NUMERICAL SIMULATION OF RETAINING WALL UNDER DIFFERENT DISPLACEMENT MODES |
| ZHOU Jian1，2，GAO Bing1，2，PENG Shuquan1，2 |
| (1. Key Laboratory of Geotechnical and Underground Engineering of Ministy of Education，Tongji University，Shanghai 200092，China；2. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China) |
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Abstract Combined with the size designed by prototype proportion，the model box is self-developed by using angle iron and organic glass with high strength. The water and soil pressure distributions and the micro-parameters of the shear zone behind retaining wall are tested under different displacement modes. Based on the model test，using secondary development particle flow program PFC2D ，the sand retaining wall is simulated by discrete element method. The passive failure mechanisms of the retaining wall are studied under different displacement modes. The different wall movement modes including three kinds of basic modes，i.e. translation(T)，rotation about base(RB)，rotation about top(RT) and two combinational modes，i.e. rotation about the point below base(RBT)，rotation about the point above top(RTT). Changes of lateral pressure，soil displacement field and deformation，and the particle aggregate internal shear strain rate distribution when the retaining wall reach a certain displacement are analyzed. Numerical simulation results indicate that the retaining wall of active and passive earth pressure simulation results are basically consistent with experimental test results；and the influence law of soil pressure distribution can be better reflected as the retaining wall under different displacement modes.
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Received: 21 September 2010
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2011, Vol. 30 
