基于J_(RC)-J_(MC)模型岩质边坡稳定性及可靠度分析

Rocky Slope Stability and Reliability Analysis Based on JRC-JMC Model

基于非线性J_(RC)-J_(MC)模型,综合考虑了边坡几何要素、锚固作用、地震动荷载及结构面各参数对边坡稳定性的影响,通过改进的拟动力法推导出地震作用下平面滑动岩质边坡抗滑稳定性安全系数计算公式。在确定性安全系数计算模型的基础上,考虑到地震作用及结构面参数的变异性,对岩质边坡稳定性进行可靠度分析。结果表明:F_(s)和β随水平和竖向地震加速度系数及放大系数增大而减小,水平地震系数影响最为显著,但三者变异系数的影响皆较低;F_(s)和β皆随结构面参数J_(RC)、J_(MC)、J_(CS)增加呈现非线性增长,J_(RC)、J_(MC)对F_(s)影响十分显著,J_(CS)相对来说较低,但三者变异系数对可靠度影响不可忽略。

Based on nonlinear J_(RC)-J_(MC) model,integratedly considered parameters of slope geometric essential factor,anchor action,earthshock dynamic load and structural plane impacts on slope stability,through modified pseudo-dynamic test have derived planar sliding rocky slope antislip stability safety factor computational formula under earthshock action.Based on deterministic safety factor computational model considering earthshock action and structural plane parameter variability have carried out rocky slope stability reliability analysis.The result has shown that the F_(s) andβdecreasing with horizontal and vertical earthshock acceleration coefficient and amplification coefficient increasing,in which,impact from horizontal earthshock acceleration coefficient most obvious,but impacts from variation coefficient of the three are all lower.F_(s) andβpresent nonlinear increasing with structural plane parameters J_(RC),J_(MC) and J_(CS) increasing,the impacts from J_(RC),J_(MC) on F_(s) are quite remarkable,while from J_(CS) relatively lower;but impacts from variation coefficient of the three could not be neglected.