基于参数反演的危岩稳定性分析与防治研究

Stability Analysis and Prevention Research of Dangerous Rocks Based on Parameter Inversion

摘要:

为研究危岩稳定性及其破坏后的影响范围，以重庆市巫山县长江支流龙门峡入口处的山体危岩为研究对象，首先调查其现场地质环境条件、前期地质成果数据及地质灾害监测等资料；然后采用数值模拟和极限平衡法，通过参数反演对该危岩体的后部和侧向裂隙贯通程度进行评价；最后对危岩体的致灾运动轨迹进行判定。结果表明：若该危岩体后部和侧向裂隙全部贯通时，危岩安全稳定系数为0.862，处于不稳定状态，若仅后部裂隙贯通时，危岩稳定系数为1.053，处于基本稳定状态，与现场实际情况基本吻合；危岩体发生崩塌破坏后，大部分落石将停留在现状边坡上的道路范围，少部分落石在碰撞弹跳后将进入下方龙门峡水域而危及下方航道通行安全。结合现场实际情况及软件模拟结果，提出了“清危+支撑立柱+锚索”的综合治理措施。

Abstract:

To study the stability of the dangerous rock and its impact range after failure, taking the dangerous rock at the entrance of Longmenxia, a tributary of the Yangtze River in Wushan County, Chongqing as the research object, its on-site geological environment conditions, preliminary geological result data and geological hazard monitoring data are inspected, and then the numerical simulation and limit equilibrium method are used to evaluate the degree of penetration of the rear and lateral cracks of the dangerous rock mass through parameter inversion. Finally, the disaster causing movement trajectory of the dangerous rock mass is determined. The results show that if the rear and lateral cracks of the dangerous rock mass are all connected, the safety and stability coefficient of the dangerous rock is 0.862, which is in an unstable state. If only the rear cracks are connected, the stability coefficient of the dangerous rock is 1.053, which is in a basically stable state, and is basically consistent with the actual situation on site. After the collapse and damage of the dangerous rock mass, most of the falling rocks will remain within the current road range on the slope, and a small number of falling rocks will enter the Longmenxia water area below after collision and bouncing, which will endanger the safety of the waterway below. Combined with the actual situation on site and software simulation results, the comprehensive management measures of “clearing danger+supporting columns+anchor cables” are proposed.