摘要
中国西南山区的可溶岩地区侵蚀、溶蚀谷地的溶蚀堆积体斜坡坡面露头看似完整,内部实则松散、透水且易滑。云南鲁甸县龙头山葫芦桥滑坡属于典型溶蚀堆积体滑坡,通过对其水文地质条件、工程地质条件和降雨等影响因素的分析,认为持续降雨和地震是该滑坡灾害发生的主要诱发因素。在取样测得岩土层物理力学参数的基础上,采用Geo-Slope软件进行稳定性分析。计算结果表明,该滑坡在天然状态下处于较稳定状态,稳定性系数为1.287;降雨、地震、降雨+地震三种工况下稳定性系数均小于1,处于不稳定状态。计算结果与该滑坡实际滑动状况相符,可为同类型滑坡的调查研究提供实例借鉴。
In southwest China, frequent geological landslide disasters often threaten and affect lives and property. In karst regions unlike others, slopes with accumulated erosion sediments in solution caves are highly porous, loose and slippery. Although the outcrops look like intact bedrock, these landslides can easily be triggered by rainfall and earthquakes, leading to serious disasters. The Huluqiao landslide at Longtou mountain, Ludian county is a typical case of a slope with accumulated erosion sediments in the solution cave. The outcrop of dissolution collapse in the surface of the slope looks like intact bedrock, which resulted in difficulty in identifying the outcrop. Through investigation of a variety of factors such as rock and soil characteristics, local hydrogeological conditions, engineering geological conditions, human engineering activities, and rainfall, it was found that the deformation and failure of the landslide was mainly triggered by rainfall along with earthquakes, due to the special characteristics of the sediments and specific geological environment. As a result, the slope was found to be stable, with the stability coefficient of 1.287. However, under the conditions of rainfall, earthquake, and rainfall together with earthquake,the stability coefficients were lower than 1.0, indicating that the slope was unstable. This study provides a representative example of investigation into this type of landslide, which can be applied elsewhere.
出处
《地震工程学报》
CSCD
北大核心
2016年第A01期138-143,共6页
China Earthquake Engineering Journal
基金
中国地质调查局地质调查工作项目(1212011220164)
国家自然科学基金(41402322)
关键词
溶蚀堆积体
滑坡
岩土特性
降雨作用
karst collapse accumulation
landslide
geotechnical characteristics
rainfall effect
