控制断层作用下高陡岩质边坡稳定性分析——以昭通市红石岩边坡为例

Stability Analysis of High Steep Rock Slope under Controlled Fault Action:Taking Zhaotong Red Rock Slope as an Example

高陡岩质边坡的稳定性分析和治理措施是工程建设和防灾减灾中亟需重视的问题。其存在岩层变化复杂,受节理、断层等结构面控制等特点。依托昭通市红石岩高陡岩质边坡工程勘察资料为地质背景,采用离散元数值模拟软件UDEC构建边坡模型,在坡体上下两个崩塌区及断层处布置监测点,通过对比是否存在断层两种工况下的位移量分布、应力分布,分析边坡中部控制断层对高陡岩质边坡失稳破坏特征的影响,提出边坡防治措施的参考依据。结果表明:位移量以控制断层为分界线,断层上部岩体在迭代过程中位移量明显大于下部岩体;断层存在对应力大小分布没有明显影响,而对应力方向具有较大影响,无断层时应力主要朝向水平,有断层时主要朝向竖直。

The stability analysis and treatment measures of high steep rock slopes are urgent problems in engineering construction and disaster prevention and reduction.High steep rock slopes are characterized by complex changes of rock strata,controlled by joints,faults and other structural planes.Based on the engineering investigation data of the high and steep rock slope of redstone rock in Zhaotong City as the geological background,discrete element numerical simulation software UDEC is used to build a slope model.Monitoring points are arranged in two collapse zones and faults above and below the slope body,and the displacement distribution and stress distribution under two fault conditions are compared.The influence of central control fault on the instability and failure characteristics of high and steep rock slope is analyzed,and the reference of slope prevention measures is put forward.The results show that the displacement is divided by the control fault,and the displacement of the upper part of the fault is obviously larger than that of the lower part.The presence of fault has no obvious effect on the stress distribution,but has a greater effect on the stress direction.The stress direction is mainly horizontal when there is no fault,and vertical when there is fault.