陕西省麟游县丈八乡滑坡群的形成机理与堰塞湖危险性评价  

The forming mechanism of landslide group and assessment of risk of barrier lake in Zhangba Town,Linyou County,Shaanxi Province,China

作　　者：辛鹏[1] 吴树仁[1] 杨为民[1] 王涛[1] 何淑军[1] 

机构地区：[1]国土资源部新构造运动与地质灾害重点实验室/中国地质科学院地质力学研究所,北京100081

出　　处：《地质通报》2009年第8期1085-1092,共8页Geological Bulletin of China

基　　金：国家"十一五"科技支撑课题(编号:2006BAC04B05);中国地质调查局项目(编号:1212010640401)资助

摘　　要：为探索黄土滑坡堰塞湖的形成机理与潜在的危险性,以宝鸡市麟游县丈八乡西坡滑坡为例,通过野外调查与室内测试计算,在简要分析宝鸡市麟游县工程地质背景和地质灾害分布特征的基础上,重点研究了麟游县丈八乡西坡滑坡群的形成演化过程、西坡滑坡堰塞湖的形成机理、西坡滑坡坝的稳定性、溃坝后的灾难性效应与潜在危险性。初步揭示:①丈八乡滑坡群集中塬边发育,受到黄土与下伏岩层接触关系的控制,降雨与地震作用是诱发滑坡的主要因素。②西坡黄土滑坡堰塞湖的坝体结构松散,但坝体宽,稳定性较好,在持续降雨的作用下有发生溢流溃坝的可能,但对下游甘肃省灵台县的威胁性小。③5·12汶川地震时在西坡塬边产生的地裂缝有继续扩展的可能性。In order to explore the forming mechanism of Xipo loess landslide and assess the potential risk, taking Xipo landslide as an example, based on brief research into engineering geologic background and geo-hazard distribution, through field investigation and indoor sampling, this paper has analyzes the forming process of Xipo landslide, forming mechanism of the barrier lake, slope dam stability and post-collapse danger risk. It＇s primarily indicated that firstly the landslide is developed intensively at the edge of tableland and is restricted by contact relationship between loess plateau and its underlying rock. Rrainfall and earthquake are major inducements for landslide; secondly, the structure of Xipo barrier lake dam is relatively loose while the dam is wide and stable, in case of continuous raining, it＇s likely to overflow and collapse, while the danger for downstream Lingtai County, Gansu Province is fairly low; thirdly, ground fissure caused by 5.12 earthquake can possibly continue to expand along the western part of the tableland.

关 键 词：麟游县 滑坡群 堰塞湖 形成机理 危险性 

分 类 号：P694[天文地球—地质学]