地下水对平推式滑坡的作用机理分析  

Analysis of the mechanism of groundwater acting on push-type landslide

作　　者：梁坤 李虎杰[1] 李松 Liang Kun;Li Hujie;Li Song(Southwest University of Science and Technology,College of Environment and Resources,Mianyang Sichuan 621000,China)

机构地区：[1]西南科技大学环境与资源学院,四川绵阳621000

出　　处：《化工矿物与加工》2021年第1期20-23,55,共5页Industrial Minerals & Processing

摘　　要：平推式滑坡常见于四川盆地近水平砂泥岩互层地区,其启动动力主要由地下水提供。前人的研究主要考虑静水压力、坡体自身重力及其所产生的扬压力对滑坡体的作用,而忽略了动水压力的影响。基于此,运用滑坡极限平衡原理,分别建立考虑动水压力和不考虑动水压力时的极限平衡方程,并推导出两种模型下平推式滑坡后缘临界水头的计算公式。通过典型平推式滑坡案例对模型进行验证,结果表明:在强降雨条件下,用考虑动水压力的极限平衡方程推导出的临界水头更符合实际;岩层倾角越大,地下水单宽流量对临界水头的影响也越大。Push-type landslides are often seen in horizontal area interbeded with sandstone and mudstone in Sichuan basin and are mainly driven by groundwater.Previous studies were focused on the effect of static water pressure,slope weight and the head pressure on landslide mass,except the influence of dynamic water pressure.Based on the above,the limit equilibrium equations of landslide considering dynamic water pressure and without considering dynamic water pressure are established separately,and the formula for calculating critical head at rear edge of push-type landslide was derived with the two models of landslide.The models were verified by typical push-type landslide cases.The results show that the critical water head derived from the limit equilibrium equation considering dynamic water pressure is more practical under the condition of heavy rainfall.In addition,the calculation results of the limit equilibrium equation show that the larger the dip angle of rock stratum,the greater the influence of groundwater flow in unit width on the critical water head.

关 键 词：平推式滑坡 地下水 流体动力荷载 临界水头 扬压力 单宽流量 极限平衡法 边坡滑移 

分 类 号：TU46[建筑科学—结构工程]