含软弱结构面岩质边坡时效稳定性影响因素的数值模拟分析

基于对岩石材料的力学性质随时间不断衰减、内部细观结构产生损伤并不断积累的认识,引入材料强度退化模型,并在有限元程序中予以实现,从结构面产状、边坡高度及坡角、岩体强度衰减特征等几个方面着手,对边坡的长期时效变形、损伤萌生与演化模式以及影响含软弱结构面岩质边坡的各种因素进行了数值模拟研究。结果表明:结构面的连通率越大,边坡高度及坡角越大,基岩及结构面的长期强度越高,则边坡的时效稳定性越好;降低边坡高度能够显著减小坡顶最大水平位移;结构面倾角对边坡的破坏模式具有重要的影响。

Numerical Investigation on the Factors Influencing the Time-dependent Stability of Rock Slopes with Weak Structure Planes

Based on the knowledge that the mechanical properties of rock may gradually degrade with time,and meso- scopic damage can accumulate inside the rock,a strength degradation model of material was employed and achieved in a finite element program, then the numerical study was performed to investigate the structure planes inside the slope. slope height and inclination and the characteristics of strength deterioration. Particularly the time-dependent defor mation,damage initiation and evolution mode,and the factors influencing time-dependent stability of the rock slope with weak structure planes were simulated. The results show that the larger connectivity rate is, the bigger slope height and inclination is, and the bigger strength of bedrock and structure planes is, the better stability of the slope is achieved. Reducing the height of the slope can significantly cut down the maximum horizontal displacement near the top of the slope. The inclination of the slope plays a major role in slope failure mode.