采动区表土水平移动对桩基作用的数值模拟研究

受地下开采的影响采动区地表会发生大幅度的沉陷和水平移动。因此建在采动区的桩基不但要承受竖向荷载，还要承受由于地表水平移动造成的附加荷载。通过对采动区桩基的受力机理的分析，表明地表土水平移动对桩的作用主要是桩与土的相对位移st造成的；采用三维有限元分析方法，得到了桩周土对桩的抗力、桩身变形、桩身最大弯矩与土位移的关系。

Research on numerical simulation of pile foundation subjected to topsoil lateral movement in mining area

Due to the underground mining, the surface ground would have a large subsidence and lateral movement. The pile foundations set in the mining area would not be only to have a vertical loading, but also to have an additional loading caused by the lateral movement. With the analysis on the stressed mechanism of the pile foundation in the mining area, the results showed that the function of the topsoil lateral movement to the pile mainly was caused by the related displacement between piles and topsoil. With the three dimensional finite element analysis method, the relationships on the compressive strength between the pile surrounding soil and the pile, deformation of the pile body, the max bending torque, and the topsoil displacement were obtained.