大型砾岩滑坡特征与成因机制分析  

Analysis on Characteristics and Genesis Mechanism of a Large-scale Conglomerate Landslide

作　　者：杨伟强[1] 巨广宏 李树武[1,2] 何晓东 YANG Weiqiang;JU Guanghong;LI Shuwu;HE Xiaodong(PowerChina Xibei Engineering Corporation Limited,Xi'an 710065,China;High Slope and Geological Disaster Research and Management Sub-Center,National Energy and Hydropower Engineering Technology Research and Development Center,Xi'an 710065,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,西安710065 [2]国家能源水电工程技术研发中心高边坡与地质灾害研究治理分中心,西安710065

出　　处：《西北水电》2022年第5期103-108,共6页Northwest Hydropower

摘　　要：为确定砾岩滑坡产生的成因机制,以国内西北地区大型砾岩滑坡为例,在调查滑坡体所处地质环境的基础上,查明了该滑坡的基本特征,结果表明:在有利的地形临空、砾岩岩性、地质构造、卸荷裂隙发育等条件下,遭受超常降雨作用,沿不利结构面发生滑移、后缘坡体逐渐拉裂,滑面最终贯通形成滑坡,本次砾岩滑坡的成因机制为滑移-拉裂型,滑动形式属于推移式。In order to determine the genesis mechanism of conglomerate landslide,a large conglomerate landslide in northwest China is taken as an example,on the basis of investigating the geological environment of the landslide,the basic characteristics of the landslide are identified and the result shows:under the condition of favorable terrain,conglomerate lithology,geological structure,development of unloading fissures,etc.,the conglomerate mass suffers from abnormal rainfall,slips along the unfavorable structural surface which causes the gradual ripping of trailing edge,and finally the slip plane is cut through to form a landslide.The genesis mechanism of this conglomerate landslide is slipping-pulling type,and the sliding type is thrust load-caused landslide.

关 键 词：砾岩 滑坡 超常降雨 成因机制 滑移-拉裂型 推移式 

分 类 号：P642.22[天文地球—工程地质学]