高陡岩质临坡地基承载力试验研究与数值模拟

Experimental research and numerical simulation of bearing capacity of high-steep rock foundations near slopes

针对高陡岩质临坡地基开展了不同坡角、坡距下承载力试验。结合深废矿坑工程采用数值模拟对高陡岩质临坡地基承载力影响因素进行了模拟计算与分析。研究结果表明:(1)承载力系数(η)随坡角(β)的增大而逐渐减小,随坡距(B)的增大呈非线性增长,当B超过一定距离时,η几乎不再增长且接近1.0;(2)相较β,地质强度指标(GSI)对η的影响更大,二者呈非线性同步增长;(3)锚索可提高η,设置4道锚索对η的提升效果较好,继续增加锚索数量对η的影响较小。

This study conducted bearing capacity test of high-steep rock slope foundation under different slope angles and slope distances to investigate the bearing capacity of high-steep rock slope foundation.We carried out numerical simulation to analyze the influencing factors of the bearing capacity of the high-steep rock slope foundation,combined with the deep waste pit project.The results show that:(1)The capacity coefficientηgradually decreases with the increase of the slope angleβ,and increases nonlinearly with the increase of slope distance B.When the slope distance B exceeds a certain value,the bearing capacity coefficientηno longer increases and approximates 1.0.(2)Compared with slope angleβ,geological strength index GSI exerts significant influence on the bearing capacity coefficient,and both of them increase nonlinear synchronously.(3)Anchor cable could improve the bearing capacity coefficientη.When four anchor cables are set,the bearing capacity coefficientηdemonstrates more significant improvement.Yet,further increase in the number of anchor cables has little effect on the bearing capacity coefficientη.