摘要
顺层岩质边坡开挖后原有岩体应力平衡被打破,可能产生破坏。为研究边坡切层高度、软弱面起伏差、软弱层倾角、软弱层黏聚力和内摩擦角对顺层岩质边坡开挖松动区范围的影响,该文分别采用正交试验法和单因素分析法进行了敏感性分析。分析结果表明,正交试验法和单因素分析法得到的影响因素敏感性排序基本一致,敏感性由大到小依次为边坡切层高度、软弱层内摩擦角、软弱层倾角、软弱层面起伏差和软弱层黏聚力。其中,边坡切层高度和软弱层内摩擦角对顺层岩质边坡开挖松动区范围影响显著。采用注浆加固软弱层和分级放坡开挖方式,可有效减小顺层岩质边坡开挖松动区范围,降低边坡支护工程规模。
After excavation of a bedding rock slope,the original stress equilibrium is disturbed,which may cause destruction.To study the influence of the slope cutting height,undulation amplitude of the weak layer,tilt angle of the weak layer,cohesion and internal friction angle of the weak layer of loosening-zone extent in a bedding rock slope excavation,this paper conducts sensitivity analysis using orthogonal test method and single-factor analysis method.Results show that both methods yield basically the same sensitivity ranking of influencing factors.From highest to lowest,the sensitivities are slope cutting height,internal friction angle of the weak layer,tilt angle of the weak layer,undulation amplitude of the weak layer,and cohesion of the weak layer.Among them,slope cutting height and internal friction angle of the weak layer have the most significant effects on the loosening-zone extent in bedding rock slope excavation.Grouting reinforcement of the weak layer and stepped bench excavation effectively reduces the loosening-zone extent in bedding rock slope excavation and the scale of slope-support works.
作者
余海
金炳宇
刘升阳
白平
冉锦屏
Yu Hai;Jin Bingyu;Liu Shengyang;Bai Ping;Ran Jinping(Sichuan Geological Environment Survey and Research Center(Mianyang);Anzhou District Natural Resources Bureau of Mianyang)
出处
《勘察科学技术》
2025年第4期22-27,75,共7页
Site Investigation Science and Technology
基金
四川省地质调查研究院科研基金项目(SCIGS-CYBXM-2023001)。
