基坑土钉支护边坡有限元稳定性分析方法探讨

针对基坑土钉支护开挖边坡的稳定性,应用强度折减法和滑面应力法2种有限元法对基坑边坡是否采用土钉支护获得的安全系数和滑动面形状进行了分析.采用土钉支护的基坑边坡,由于在强度折减时,仅仅对土体强度参数进行了折减,未考虑土钉自身的强度降低,因而,采用2种有限元方法得到了不同阶段下虽然安全系数一致,但滑动面形状和位置不同的结论.提出了将土钉支护对土体以及边坡的作用考虑进去,以实现土钉支护技术在项目工程施工中更具现实的理论意义的意见.

Foundation pit slope stability analysis method of finite element

In connection with slope stability of soil nailing support for foundation pit, the slip surface stress analysis method and strength reducion method were used to analyze the stability of soil nailing support for foundation pit. For the slope with soil nailing support for foundation pit, the safety factors by two finite element methods were consistent; but the shapes of critical slip surface were inconsistent in different stages. The reason was that only the strength of the soil and the cement deep mixing pile were reduced during the process in the calculation; and the strength parameters of the nail bar were regarded as constant. Considering the effect of soil nailing on soil and slope, Soil nailing technology had a more realistic theory meaning in the construction.