断续结构面岩质边坡的应力敏感性分析

Stress sensitivity analysis ofthe rock slope with a discontinuous structure

为研究断续结构面岩质边坡的应力敏感性,以锚杆为测力媒介进行了三组贯通率均为50%但分布形式不同的断续结构面岩质边坡离心模型试验,并开展了相应模型A、B、C的数值模拟分析。监测锚杆轴力历时曲线、边坡破坏模式和数值模拟的研究结果表明,边坡模型A破坏时滑动面为直线型,应力敏感区域位于结构面贯通区,且结构面贯通区中部的应力最敏感;边坡模型B产生近似圆弧型滑动,应力敏感区域位于潜在滑动面处,且滑动面坡脚剪出口处应力最敏感;边坡模型C破坏时滑动面近似S型,应力敏感区域位于结构面贯通区,且结构面贯通区上部的应力最敏感。研究成果可为断续结构面岩质边坡的锚杆监测工作提供一定参考。

To study the stress sensitivity of the rock slope with a discontinuous structure,centrifugal model tests of three discontinuous structure plane rock slopes with 50%percent rate but different distribution patterns are executed by means of monitoring force via anchor bolt,and then corresponding numerical simulation analysis is also carried out.The study result of monitoring the axial force curve of the anchor,the failure mode of the slope and the numerical simulation shows that the sliding surface is linear when the slope model A is broken,the stress sensitive area is located in the structural plane,and the stress at the central of the structural plane is the most sensitive.The slope model B produces approximately a circular arc sliding,the stress sensitive area is located at the potential sliding surface,and the stress at the shearing surface of the sliding surface is the most sensitive.The sliding surface model C is approximately S-shaped,and the stress sensitive area is located in the structural surface penetration area.And the stress in the upper part of the structural surface penetration zone is the most sensitive.The research result can provide some reference for the bolt monitoring work of intermittent structural rock slope.