荔大县地裂缝危险性区划大学--大学毕设论文VIP专享

摘 要大荔县地裂缝最早出现于上世纪 70 年代，地裂缝成因复杂多样，是活动断裂、降雨、地下水活动和人类工程活动（农田灌溉）等多种因素作用下的一种综合效应。本文采纳层次分析法系统地对大荔县地裂缝进行了区划讨论。通过讨论已有资料以及实地调查，对大荔县区域地质环境特征进行了讨论分析，总结了大荔县地裂缝的空间分布发育特征和分布规律。在此基础上，分析现有的区划讨论成果，提出了大荔县地裂缝危险性区划的目的、意义、方法和依据。抓住浅表层土不均匀变形是地裂缝发生的本质原因，建立了大荔县地裂缝危险性区划评价指标体系，选取了地形地貌、岩土体类型、地裂缝活动性、地裂缝密度等 13 个区划评价因素。综合上述讨论基础并结合大荔县地裂缝灾害的现状和特征，基于 MapGIS 软件平台，叠加各地质图层对大荔县地裂缝进行危险性区划，并编制大荔县地裂缝危险性区划图系。关键词：大荔县，地裂缝，层次分析法，危险性区划ABSTRACTDali County ground fissure first appeared in the 1970s, whose cause is complex and diverse geneses. It is a comprehensive effect of multiple factors under rainfall, groundwater activities and human activity (irrigation), etc.This dissertation uses the AHP to do the risk zoning of the Dali County ground fissure. According to the available data and the field survey, we summed up the cracks in the Dali County spatial distribution development features and distribution rules through analysising Dali County regional geological environmental characteristics. On this foundation, the author proposed the goal, significance, method of the Dali County ground fissure hazard zonation. Seizing the essence that the non-uniform deformation of the shallow soil layer caused the occurrence of ground fissures, we established the Dali County ground fissure hazard zonation evaluation index system through selecting 13 factors such as the topography, the type of rock and soil, the density of ground fissures, the activity of ground fissures and so on.Based on the...