降雨对含有软弱夹层的边坡稳定性影响分析

Stability analysis of slope with weak interlayer under rainfall condition

边坡稳定性分析是露天采场工程建设中的核心问题,而大多数滑坡都在雨季或降雨后的短时间内发生,在边坡稳定性分析中合理地考虑降雨作用的影响十分必要。以云南宝坪采场边坡为研究对象,根据工程施工的实际情况,分5个开挖步、6个阶段对处于降雨状态下的边坡稳定性进行了模拟分析。分析结果表明,在整个开挖过程中,边坡岩体处于降雨状态时边坡的稳定性程度会明显降低,特别是当边坡开挖至第三阶段时,边坡的位移值及安全系数均出现了大的跳跃式变化,证明了水是造成边坡发生滑坡的诱导因素。

Stability analysis of slope is the core issue of open pit construction.Most of the landslides occur in rainy season or a short time after rainfall.Reasonably considering the rainfall effect is very necessary in the stability analysis of slope.Taking the stope slope in Yunnan Baoping for example,the simulation analysis of slope stability under rainfall condition was done through dividing slope into five steps excavation and six periods state according to the actual situation of the engineering construction.The results showed that the slope stability decreased obviously during excavation when the stope slope is under the rainfall condition.Especially when the slope was excavated to step 4,the slope displacement and the safety factor changed greatly,which proved that water is the inducing factor causing slope landslide.