陡倾顺层边坡地下开挖失稳模式分析  

Failure Mode Analysis of Underground Excavation of Steep Inclined Slope

作　　者：李宗鸿 袁维 王伟 李家欣 LI Zong-hong;YUAN Wei;WANG Wei;LI Jia-xin(Civil Engineering college,Shijiazhuang Railway University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,石家庄050043

出　　处：《科学技术与工程》2020年第5期1988-1992,共5页Science Technology and Engineering

基　　金：河北省自然科学基金青年科学基金(E2018210046);贵州省科技支撑计划(黔科合支撑[2019]2883号);国家自然科学基金青年科学基金(51709176)。

摘　　要：为了探究陡倾顺层边坡在地下开挖工况下的失稳模式,进行陡倾顺层边坡的地下开挖相似模型试验,并通过离散元软件(universal distinct element code,UDEC)数值模拟分析与相似模型试验互相验证,以极限平衡法为理论基础提出该失稳模式的稳定性分析方法,并以相似模型试验验证方法的可行性。试验结果表明,陡倾顺层边坡开挖后,其开挖区上方岩体将沿岩层层面发生剪切滑动,并导致边坡坡面产生塌陷,可见其失稳模式为“滑塌”破坏。通过计算边坡模型潜在滑塌岩体的抗滑力和下滑力,定义安全系数为其比值,得其安全系数为0.66。该稳定性分析方法可为边坡安全性评价提供新思路。In order to explore the instability mode of steep inclined slope under the condition of underground excavation,a similar model test of underground excavation of steep inclined slope was carried out,and universal distinct element code(UDEC)numerical simulation analysis was subsequently carried out and verified with similar model test.Finally,based on the limit equilibrium method,the stability analysis method of the instability mode was proposed,and the feasibility of the method was verified by the similar model test.The test results show that after the excavation of steep dip bedding slope,the rock mass above the excavation area will shear and slide along the rock layer,which will lead to large-scale collapse of the slope surface.Its failure mode is“sliding”failure.By calculating the sliding resistance and sliding force of potential collapse rock mass,the safety factor is defined as its ratio,and the safety factor of similar model after excavation is 0.66.The stability analysis method provides a new idea for slope safety evaluation in the future.

关 键 词：陡倾 顺层边坡 地下开挖 失稳模式 稳定性分析 

分 类 号：TU42[建筑科学—岩土工程]