福建寿宁武曲降雨诱发型滑坡稳定性评价  

Stability Evaluation of Rainfall-induced Landslide in Wuqu Village of Shouning County,Fujian Province

作　　者：黄朝阳[1] Huang Chaoyang(No.4 Geological Party of Fujian Province,Ningde,352100)

机构地区：[1]福建省第四地质大队,宁德352100

出　　处：《福建地质》2024年第4期297-305,共9页Geology of Fujian

摘　　要：丘陵斜坡地貌受降雨影响极易发生滑坡灾害。以宁德市武曲村滑坡为研究对象,通过现场位移监测和钻探分析滑坡的变形特点和地质环境;分别采用极限平衡理论和FLAC 3D软件进行稳定性计算,结合降雨工况对滑坡进行综合评价。结果表明坡脚开挖导致该斜坡整体稳定性下降,是老滑坡复活的必要条件。受降雨影响,雨水沿裂隙渗入,滑坡后缘下挫逐步扩大,进一步减弱滑坡稳定性,加速滑动。模拟结果显示主滑带应力集中现象明显,受外界诱发因素影响易形成灾害,存在较大风险。研究结果可作为武曲村滑坡治理设计参考依据,有助于提升防灾减灾能力。Hilly slope landscapes are highly susceptible to landslide disasters under the influence of rainfall.This paper takes the landslide in Wuqu Village,Ningde City,as a research object,and analyzes the deformation characteristics and geological environment of the landslide through on-site displacement monitoring and drilling;respectively,it adopts the limit equilibrium theory and the FLAC 3D software to carry out the stability calculation,and then combines with the rainfall conditions to make a comprehensive evaluation of the landslide.The results show that the excavation at the foot of the slope leads to the decline of the overall stability of the slope,which is a necessary condition for the resurrection of the old landslide.Under the influence of rainfall,the rainwater seeps in along the fissure,and the setback of the trailing edge of the landslide expands gradually,which further weakened the stability of the landslide and accelerated the sliding.The simulation results show that the main landslide zone has obvious stress concentration phenomenon,which is prone to form a disaster under the influence of the external triggering factors,and there is a greater risk.The results of the study can be used as a reference basis for the design of landslide management in Wuqu Village,which can help to improve the disaster prevention and mitigation capabilities.

关 键 词：位移监测 极限平衡 数值模拟 稳定性分析 武曲村滑坡 福建寿宁 

分 类 号：P642.22[天文地球—工程地质学]