边坡稳定及加固分析的有限元强度折减法

Slope stability and strengthening analysis by strength reduction FEM

将强度折减理论应用于土质边坡稳定及加固的弹塑性有限元分析中,提出了以某一幅值的总等效塑性应变区,从坡脚到坡顶贯通时为边坡破坏的标准,不但物理意义很明确,而且可以根据边坡临界破坏时的等效塑性应变区确定滑动面位置,并认为此前的折减系数即为边坡的安全系数。对某供水改造工程中边坡的稳定性分析及加固计算表明:该破坏判别标准是适宜的,能够在工程实际中加以运用。

An elastoplastic strength reduction FEM is utilized in the analysis of slope stability and reinforcing; and the authors present a well-defined total equivalent plastic strain (TEPS) zone as the failure criterion when it running through the bottom to the top of a slope by the strength reduction FEM method. So, the conception of failure of a slope is clear. At the same time, the strength reduction coefficient before the TEPS zone is considered as the safety factor of a slope; thus, the sliding surface must be located at the zone of TEPS. The results of stability analysis and the reinforcing calculation of a certain slope in a certain water supply reconstruction project show that the TEPS zone as a failure criterion of strength reduction FEM is reasonable and can be widely applied to slope engineering practice.