基于有限元剩余推力法的岩质边坡抗滑稳定性分析

Anti-sliding Stability Analysis of Rock Slope Based on Finite Element Method of Residual Thrust

针对传统有限元应力代数和法忽略了滑裂面方向对安全系数的影响,导致计算结果出现较大偏差的问题,提出了加入滑裂面方向因素的有限元剩余推力法,即将计算得到的各滑裂面上的剩余力转换到第三滑裂面上,对第三滑裂面使用等安全系数法进行迭代计算,求得总滑面的安全系数,并通过改变第三滑裂面与水平方向的夹角搜寻最危险滑裂面。运用算例对有限元剩余推力法与传统有限元应力代数和法所得安全系数进行对比分析表明,剩余推力分析法所求得的安全系数比传统的应力代数和法更接近工程实际,且可以搜索到安全系数最小的滑裂面。

The traditional finite element stress algebraic sum calculation method neglects the influence of sliding plane direction on the safety factor. So, the calculation results appear large deviation. In order to solve the problem, this paper put forward the finite element method of residual thrust by introducing the direction factor of sliding plane. The calculated residual force of each sliding surface was transformed into the third sliding surface and the equal safety coefficient method was used to iterative calculation. Finally, the safety coefficient of the total sliding surface was obtained. The most dan gerous sliding surface was found by changing the angle between the third sliding surface and the horizontal line. Compared with the results of two methods through an example, it shows that the safety coefficient obtained by the finite element method of residual thrust is closer to the engineering practice. Furthermore, the minimum safety coefficient of sliding surface can be found.