广元宝珠村滑坡工程地质特征及成因机制研究  

ENGINEERING GEOLOGICAL CHARACTERISTICS AND FORMATION MECHANISM OF BAOZHU LANDSLIDE IN GUANGYUAN

作　　者：赖书名 胡勇生 LAI Shu-ming;HU Yong-sheng(909 Hydrogeology and Engineering Geological Team of Geological and Mineral Exploration and Development Bureau of Sichuan,Mianyang 621000,China;Sichuan Province Geological Engineering Cornplex,Changdu 610015,China)

机构地区：[1]四川省地质矿产勘查开发局九0九水文地质工程地质队,绵阳621000 [2]四川省地质工程集团公司,成都610015

出　　处：《地质灾害与环境保护》2018年第3期43-48,61,共7页Journal of Geological Hazards and Environment Preservation

摘　　要：2010年7月23日,广元宝珠村发生第四系堆积层滑坡,滑坡直接造成部分村民房屋损毁、道路中断,并对周边18户65人生命财产构成威胁。本文综合现场调查、滑坡勘察等相关资料,查明滑坡工程地质特征,并结合seep/w数值分析对滑坡成因机制展开研究。结果表明:该地形斜坡具有较大的重力势能,第四系堆积层力学强度较差,且具有良好渗透性,工程开挖在减小坡脚抗滑阻力的同时产生临空面,种种因素成为滑坡启动的前提条件。"7.23"强降雨引起坡脚大范围土体饱和、斜坡土体抗剪强度降低,导致斜坡稳定性下降,最终发生失稳破坏。由此可见,滑坡是多因素综合作用的结果,降雨是诱发滑坡的关键控制因素。On July 23,2010,the Quaternary accumulation landslide occurred in Guangyuan BaoZhu village.The landslide directly caused the destruction of some villagers＇ houses and the interruption of the road,and threatened the life and property of the 65 people in the surrounding 18 households.In this paper,the geological characteristics of landslide engineering are found out by the relevant data of field investigation and landslide investigation,and the genetic mechanism of landslides is studied with seep/w numerical analysis.The results show that the slope of the terrain has large gravitational potential energy,the mechanical strength of the Quaternary accumulation layer is poor,and it has good permeability.The engineering excavation can reduce the anti-sliding resistance of the slope at the same time and produce the face surface.All kinds of factors become the precondition for the start of the landslide.The ＂7.23＂ heavy rainfall causes the soil mass saturation at the toe of the slope,and the shear strength of the slope soil decreases,resulting in the decline of the stability of the slope,and finally the instability failure.It can be seen that landslide is the result of multiple factors.Rainfall is the key controlling factor for landslide.

关 键 词：强降雨 宝珠村滑坡 工程地质特征 成因机制 seep/w数值模拟 

分 类 号：P642[天文地球—工程地质学] P642.22[天文地球—地质矿产勘探]