贵州省长顺县滑坡与崩塌灾害的孕灾地质条件分析

An Analysis of Geological Conditions Inducing Landslide and Cave-in Hazards in Changshun County, Guizhou

长顺县地质灾害隐患点多面广,主要由滑坡与崩塌组成,具有隐蔽性、突发性、破坏性和动态变化等特点。以长顺县108处代表性地质灾害点为研究对象,探讨分析了地形地貌、工程地质岩组与水文地质条件等对地质灾害的影响。研究表明:滑坡主要集中发生在坡度为10°~30°,相对高差为20~50 m的土质斜坡上,滑坡灾害的发生与降雨具有较明显的正相关性;崩塌主要分布在坡度≥60°,相对高差为50~150 m的硬质岩斜坡。根据长顺县地质灾害发育特征,结合工程地质条件可将全区的孕灾地质条件划分为易孕灾区、较易孕灾区与一般孕灾区。

The hidden dangers of geological disasters in Changshun county are multi-faceted and wide. It is mainly composed of landslides and collapses with the characteristics of concealment, suddenness, destructiveness and dynamic changes. This paper takes 108 representative geological disaster points in Changshun county as the research object, and it discusses about the influence of topography, engineering geological rock formation and hydrogeological conditions on geological disasters. The research shows that landslides mainly occur on soil slopes with a slope of 10°~30° and a relative height difference of 20~50 m, and there is a significant positive correlation between the occurrence of landslide disasters and rainfall. Collapses are mainly distributed on hard rock slopes with a slope of ≥60° and a relative height difference of 50~150 m. According to the development characteristics of geological disasters in Changshun, combined with the engineering geological conditions, the geological conditions of disaster-pregnancy in the whole region can be divided into prone disaster areas, which is of relatively-prone disaster areas and general disaster areas.