高速铁路采空区桥基沉降变形数值模拟分析

Numerical Simulation on Bridge Foundation Settlement of High-Speed Railway in Goaf Area

通过对采空区桥梁群桩基础沉降进行数值模拟,分析采空区桩基在荷载作用下变形过程及特点,揭示不同工况下的基础变形规律。研究结果表明,基础沉降满足规范要求,沉降主要集中在浅层土地层中;桩间土与桩顶沉降均匀;采空巷道顶板的沉降与地基其他部位沉降基本一致,桩基能够有效限制采空巷道顶板的变形。

This paper established a numerical model to simulate the settlement of bridge pile group foundation in goaf area, and analyzed the deformation process and characteristics of pile foundation in goaf area; further, the different deformation rules under various engineering conditions were depicted in detail. The study result reveals that： （a） the foundation settlement meets the requirement of standard code, and the settlement mostly occurs in the shallow soil layer; （b） the settlements of soils between and on the piles are uniform ; （e） the settlement of the goal roadway roof is basically the same as that of other parts of the foundation, and this proves that the pile foundation can effectively limit the deformation of the goal roadway roof.