岩质高边坡开挖变形的三维离散单元法分析

Analysis of excavation-induced high rock slope deformation with 3D discrete element code

对一典型的反倾向层状结构岩质高边坡进行了非连续非线性三维数值模拟.数值模型中考虑了复杂的地质条件,同时模拟了进水口高边坡的控制性结构面和陡倾节理组,实现了边坡、引水隧洞的分步开挖及锚固.运用三维离散单元法(3DEC)进行了混合不连续和蜕化连续2种方式的求解,在比较不同求解方式所得计算位移的基础上,探讨了结构面对计算结果的影响,分析了进水口边坡在开挖、加固作用下的变形状况和稳定性.

Three-dimensional discontinuous and nonlinear numerical simulation was performed of a typical high rock slope with anti-dip strata structure. With complicated geological condition taken into account, the control structural plane and anti-dip joint set of the high slope at inlets were simulated, and the excavation and anchoring of the slope and diversion tunnel in stages were realized numerically. Moreover, 3D discrete element code （3DEC） was used to solve the deformation of the high slope in the modes of mixed discontinuousness and degenerate continuousness. The influence of structural plane on the calculated result was discussed, and the stability of the high slope at inlets after excavation and reinforcement was analyzed by comparison of the calculated results in different calculation modes.