基于强度折减法的花石崖危岩体稳定因素数值分析

危岩体一般处于非稳定或极限平衡状态,影响危岩体稳定的因素很多,而地质勘探往往难以给出危岩体的准确参数。以金沙江花石崖危岩体为例,主要考虑了危岩体裂缝位置和深度、裂缝中水压力大小、危岩体强度参数以及危岩体下部软弱岩层参数等因素。使用FLAC~(3D)软件基于强度折减法计算分析各因素变化对危岩体安全系数的影响。对比计算分析结果表明,裂隙水压力和危岩体下部软弱岩层参数对危岩体稳定影响较大,在危岩体治理中应加固下部软弱岩层以及封闭上部裂缝,防止雨水汇集。

Numerical Analysis on Stability Factors of Potentially Unstable Rock at Huashi Cliff Based on Strength Reduction Method

Potentially unstable rock mass is generally in unsteady or limit equilibrium state.There are many factors that affect the stabihty of potentially unstable rock mass,but geological exploration is often difficult to give accurate parameters about the potentially unstable rock mass.With the potentially unstable rock mass at Huashi cliff on Jinsha River as an example,we took in consideration factors including crack position and depth,fissure water pressure,strength parameters of potentially unstable rock mass,and parameters of weak rock strata under the potentially unstable rock mass.Furthermore,we calculated the effect of the above factors on the safety coefficient of rock mass by using FLAC3D based on strength reduction method.Through comparisons,we concluded that fissure water pressure and parameters of weak rock strata under the potentially unstable rock mass have great influence on the stability of the potentially unstable rock mass.Therefore,weak rock strata under the potentially unstable rock mass should be reinforced,and the fissures must be closed to prevent from rainwater collection.