花溪区地质灾害孕灾地质条件特征分析

Analysis of hazard-formative environment of geologic hazards in Huaxi District

研究区地质灾害主要控制因素为高差、工程地质岩组类型、斜坡结构和降雨影响;其次为地质构造影响。地质灾害发生位置斜坡形态多以凸型、直线型、凹型为主,分布高差多位于20~100 m。地质灾害易发于硬质岩类工程地质岩组和软硬相间工程地质岩组地层。滑坡地质灾害多易发于顺向坡和逆向坡,崩塌主要发育于逆向坡。时空分布上,降雨及地下水活动对地质灾害形成的影响较大,灾害发生频率与降雨呈正相关性。

The main control factors of geologic hazards in the study area are relative height difference,engineering geological rock group type,slope structure and rainfall,followed by the influence of geological structure.The shapes of the slopes where the geologic hazards distribute are mainly convex,linear and concave,and the height difference is between 20 m and 100 m.Geologic hazards are prone to occur in engineering geological rock group types of hard rock and soft-hard-alternating rock formation.Landslides often occur in the forward slope and reverse slope,while collapses mainly develop in the reverse slope.Rainfall and groundwater activity have a great impact on the formation of geologic hazards,and the occurrence frequency of geologic hazards is positively correlated with rainfall.