不同岩层倾角顺倾层状岩质边坡破坏机制研究  

Study on the failure mechanism of rock slopes with dipped layered structures under various rock dip conditions

作　　者：孙书伟[1] 李圆 杨晓锐 胡家冰 刘流 SUN Shuwei;LI Yuan;YANG Xiaorui;HU Jiabing;LIU Liu(School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Northern Engineering and Technology Corporation,MCC,Dalian,Liaoning 116622,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,北京100083 [2]中冶北方工程技术有限公司,辽宁大连116622

出　　处：《岩石力学与工程学报》2024年第7期1607-1620,共14页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点研发计划(2017YFC1503103)。

摘　　要：顺层岩质边坡在自然界中广泛存在,研究顺层岩质边坡的变形破坏机制是边坡工程中的重要课题。运用底摩擦试验以及数值模拟手段,对不同岩层倾角条件下顺层岩质边坡的破坏机制进行对比分析。研究结果表明:(1)边坡的破坏机制随岩层倾角的不同发生显著改变,层面倾角为10°时边坡破坏模式为滑移-拉裂,层面倾角为30°时破坏模式为平面滑动-剪出,层面倾角为45°时破坏模式为滑移-挤压,层面倾角为75°时破坏模式为弯曲-倾倒;(2)基于测点图像追踪技术获取顺层岩质边坡的破坏过程,特征点位移结果表明顺层边坡的变形破坏具有明显的阶段性;(3)边坡安全系数与岩层倾角直接呈非线性相关,当岩层倾角为0°~25°时,安全系数随岩层倾角的增大逐渐降低,当岩层倾角为25°~70°时,安全系数随岩层倾角的增大而逐渐增大,岩层倾角大于65°,边坡安全系数变化不大;对于边坡稳定性,底摩擦试验与数值分析的结果较为一致;不同岩层倾角条件下顺层岩质边坡的稳定性显著差异的原因在于边坡破坏机制的显著变化。研究成果可为顺倾层状结构岩质边坡的安全评价和灾害识别提供参考。Bedded rock slopes are widely present in the nature.The research of the deformation and failure mechanism of bedded rock slopes is an important topic in slope engineering.Using bottom friction tests and numerical simulation methods,the failure mechanism of bedded rock slopes with different rock dip angles was contrastive analysis.The results show that:(1)the failure mechanism of slopes changes significantly with different rock dip angles.When the dip angle is10°,the failure mode of slopes is slip-tension,when the dip angle is 30°,the failure mode is plane sliding shear,when the dip angle is 45°,the failure mode is slip-compression,and when the dip angle is 75°,the failure mode is bending-toppling.(2)Based on monitoring point image tracking technology,the failure process of bedded rock slopes is obtained,and the displacement results of characteristic points indicate that the deformation and failure of bedded slopes have obvious stages.(3)The safety factor of slopes is non-linearly related to the inclination angle of rock layers.When the inclination angle of rock layers is 0°-25°,the safety factor gradually decreases with the increase of the inclination angle of rock layers.When the inclination angle of rock layers is 25°-70°,the safety factor gradually increases with the increase of the inclination angle of rock layers.After the inclination angle of rock layers is greater than 65°,the safety factor of slopes don’t change much.The results of bottom friction test matches numerical analysis on slope stability closely.The significant difference in stability of bedded rock slopes with different rock dip angles is attributed to the significant changes in slope failure mechanisms.The findings of this study can provide reference for the safety evaluation and disaster identification of bedded rock slopes.

关 键 词：边坡工程 顺倾岩质边坡 底摩擦试验 破坏机制 边坡稳定性 

分 类 号：P642[天文地球—工程地质学]