顾及位移与雨量观测的降雨驱动滑坡稳定性分析  

Xishancun landslide stability analysis by coupling GPS monitoring and rainfall observation

作　　者：刘春 邵晓航 李巍岳[2] 

机构地区：[1]同济大学测绘与地理信息学院,上海200092 [2]上海师范大学城市研究院,上海200234

出　　处：《工程勘察》2018年第2期46-52,共7页Geotechnical Investigation & Surveying

基　　金：国家重点基础研究发展计划(973计划)项目(2013CB733204)

摘　　要：滑坡是一种多发且危害巨大的自然灾害,对其进行实时的监测,并基于结果分析它的稳定性状态具有重要的意义。本文基于"卸加载响应比模型",综合运用数学统计的方法,提出一种大型滑坡稳定性分析的方法。首先根据GPS的观测结果,分析滑坡的位移特点,然后耦合GPS观测以及降雨观测结果,选择不同尺度,计算ULDRR系数,最后分析滑坡的整体稳定性和区域相对稳定性特点。以四川省理县西山村滑坡为例,建立观测网络,对大型滑坡稳定性分析方法进行验证。结果表明,西山村滑坡呈现三级变形的特点,水平方向变形较为明显,方向自上而下由SW转SSW,最大位移速率可达37.4mm/月;西山村滑坡稳定性与降雨在变化趋势上呈负相关,并且自上而下逐级递减,最活跃区域的平均ULDRR系数均低于2.77,不稳定率达50%以上。Landslide is a frequently happening nature disaster causing huge damages. It is of big value to conduct real-time monitoring and analyze the slope stability. This paper promotes a method towards giant landslide stability analyzing integrated with mathematical statistics based on the Un-lode Lode Displacement Response Ratio theory. Firstly, according to GPS surveying results, the movement features of the landslide are presented. Then coupled with the rainfall observation, different scales are selected to calculate the ULDRR, based on which the overall and relative slope stabilities are analyzed. Xishaneun landslide is taken as the study area. After establishing the observation network, this paper gives a thorough analysis on its stability characteristics. The results show that the deformation of Xishancun landslide is characterized by three grades. Horizontal deformation is principle and its direction turns form SW to SSW top down. Besides the maximum displacement rate is up to 37.4mm per month. Furthermore, there is a negative correlation between the landslide stability and rainfalls. The ULDRR coefficients in active area are lower than 2.77, and instability rates are more than 50%

关 键 词：GPS滑坡监测 稳定性分析 大型滑坡 降雨观测 卸加载相应比 

分 类 号：P642.22[天文地球—工程地质学]