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本文以GZ40公路安康至紫阳段为例,在收集野外资料,详细分析研究区环境地质背景及地质灾害类型及成灾特点的基础上,合理选取地质灾害危险性评价指标,建立指标体系,运用层次分析法计算各评价因子相对权重,建立模糊关系矩阵,采用三级模糊综合评价法计算出评价区地质灾害危险性等级。评估结果,研究路段地质灾害危险性程度不等,主要以危险性轻度为主。危险性中等级及高危险等级区段主要分布在滑坡、崩塌、泥石流、危险性斜坡等灾害分布密集带和沟谷地带。
Taking the section of Ankang-Ziziyan-GZ40 as an example, on the basis of collecting field data, analyzing in detail the environmental and geological backgrounds and types of geological disasters in the study area and the characteristics of the disaster, the index of risk assessment for geological disasters is selected reasonably and the index system is established. Analytical method to calculate the relative weight of each evaluation factor, the establishment of fuzzy relation matrix, using three-level fuzzy comprehensive evaluation method to calculate the geological disaster hazard rating of the evaluation area. As a result of the assessment, the degree of risk of geological disasters in the study sections varies, mainly based on mild and dangerous conditions. Hazardous intermediate and high-risk sections are mainly distributed in densely distributed belts and valleys of landslides, landslides, landslides, and dangerous slopes.