露天矿区地质灾害易发性评价

Evaluation of Geological Hazard Susceptibility in Open-pit Coal Mine

以桐柏县露天矿区为例,采用栅格单元评价法对研究区进行划分,共3 064 985个栅格单元,在此基础上展开易发性评价。并选取坡度、高程、工程地质岩组、距断层距离、斜坡结构类型、水系距离、道路距离、地貌类型作为评价因子。采用自然间断法将叠加计算的值分为4个等级(高易发区、高易发区、中易发区与低易发区)。按照《地质灾害风险调查评价技术要求(1∶50 000)》(试行)中地质灾害不同分区等级规定的图示图例进行区分,最后得出河南省桐柏县露天易发性分布。研究为桐柏县政府提供露天防灾减灾管理、国土空间规划和用途管制的基础地质依据。

Taking the opencast coal mine in Tongbai county as an example,divides the study area into 3064985 grid units by grid unit evaluation method,and then carries out the vulnerability evaluation on this basis.The slope,elevation,engineering geological rock group,distance from fault,slope structure type,water system distance,road distance and landform type are selected as evaluation factors.The natural break method is used to divide the superimposed values into four levels(high prone area,high prone area,medium prone area and low prone area).According to the illustration and legend of different zoning and classification of geological hazards in the Technical Requirements for Geological Hazard Risk Investigation and Assessment(1∶50000)(for trial),the vulnerability distribution of opencast coal mines in Tongbai county,Henan province is finally obtained.The study provides Tongbai county government with basic geological basis for disaster prevention and mitigation management,land space planning and use control of open-pit coal mines.