摘要
为了确定百米级以上覆盖型高陡边坡稳定性主控因素,指导边坡现场支护工作,以川西某隧道工程边坡为典型案例开展研究,隧道出口上方为泥石流堆积体。选取上覆土层厚度H、坡面倾角β、地震动峰值加速度a、土体内摩擦角φ、黏聚力c、重度γ、弹性模量E、泊松比μ等参数,开展边坡稳定性影响因素敏感性分析。利用正交试验设计,采用有限差分强度折减法进行边坡安全系数的计算,基于方差分析和F检验完成影响因素敏感性排序和显著性检验,并开展边坡稳定显著性参数影响分析。分析结果表明:边坡稳定性影响因素敏感性顺序依次为β、φ、a、H、c、γ、E、μ,其中β、φ、a、H、c为边坡稳定性的显著性影响因素;地震工况下边坡处于不稳定状态,需对边坡进行支护,支护位置应选取泥石流阶地坡面缓变陡区域。
In order to determine the main controlling factors of the stability of high and steep covered slope above 100 meters and guide the on-site work of slope supporting,a tunnel slope in western Sichuan is taken as a typical case.There is debris flow accumulation above the tunnel's exit.Influencing factors including overlying soil thickness H、slope dip angleβ、peak acceleration of ground motion a、soil friction angleφ、cohesion c、bulk densityγ、elastic modulus E、Poisson's ratioμwere selected to carry out the sensitivity analysis of influencing parameters of slope stability.Based on orthogonal experimental design,the finite difference strength reduction method was used to calculate the factor of safety of slope,and the sensitivity ranking and significance test of influencing factors were completed based on variance analysis and F test,and the influence analysis of the significance parameters of slope stability was carried out.The results show that the sensitivity of factors affecting slope stability is in the order ofβ、φ、a、H、c、γ、E、μ.Among them,β、φ、a、H、c are significant factors.The slope is in an unstable state under earthquake conditions,so it is necessary to support the slope,and the supporting position should be set in the area where the slope of debris flow changes from gentle to steep.
作者
支墨墨
吴迪
陈士通
ZHI Momo;WU Di;CHEN Shitong(Hebei Engineering Innovation Center for Traffic Emergency and Guarantee,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)
出处
《国防交通工程与技术》
2023年第3期30-32,36,共4页
Traffic Engineering and Technology for National Defence
基金
河北省省级科技计划(225676104H)。
关键词
覆盖型边坡
正交试验
稳定性分析
安全系数
敏感性分析
covered slope
orthogonal test
stability analysis
safety factor
sensitivity analysis实例Analysis of Practical Examples
