基于离散元的强度折减法分析岩质边坡稳定性

Stability analysis of jointed rock slope by strength reduction method based on UDEC

将通用离散元UDEC与强度折减法结合,对含多结构面的岩质边坡的稳定性进行了分析。通过对节理岩质边坡的UDEC模型中的可变形块体和节理单元的强度参数进行折减,使模型不能再达到平衡状态,此时的折减系数就是边坡的安全系数,另外,由对应的边坡块体的速度矢量可以确定滑动面和边坡的破坏形态。通过与传统的条分法的结果比较,表明基于UDEC的强度折减法是一种可靠、有效的方法,为复杂节理岩质边坡的滑动面确定与安全系数计算开辟了新的途径。

The stability of the jointed rock slopes is analyzed by means of the universal distinct element code（UDEC） in which the strength reduction method is included. In the analysis, the cohesion and internal friction angle of the rock and joint plane are reduced by a reduction factor. The reduction factor becomes the factor of safety（FOS） when the slope can not reach equilibrium by decreasing the strength parameters. In addition, the slip surface and failure mode of the slope can be determined by the velocity vector of the blocks. Numerical results presented in the paper indicate that the strength reduction method combined with UDEC is reliable and powerful alternative against traditional limited equilibrium method and that it will be a new approach to obtaining the slip surface and FOS of jointed rock slope.