Research Of Geological Hazards And Risk Division For New Town Planning Of Beijing Yanqing

Because of the terrain and geological conditions of the more complex activities between the new structure in Beijing, the uneven spatial and temporal distribution of precipitation, intense human activities, leading to fragile geological environment, geological disasters are more developed. This paper, " Plan of Beijing Urban Master (2004 -2020) ""pre-Beijing Yanqing planning regional engineering geological exploration Metro"project, the use of on-site inspection and survey points collected by geological disasters and regional geological data to GIS system as a platform, Using cluster analysis, the final completion of Risk assessment of geological hazard map and then use this map for Metro Yanqing planning Risk assessment of geological hazards. Specific contents are as follows:(1) Detailed investigation of geological disasters, based on the analysis summarized Yanqing District Town Planning and Development of the main types of geological hazards are landslides, unstable slopes, landslides, active faults and liquefaction, etc., with a clear temporal and spatial characteristics, and disaster The formation of dynamic geological processes by internal and external impact of a potential hazard risk.(2)The study area in the town of Yanqing exist Survey geological hazards and trends on the basis of the forecast to determine the geological hazard evaluation index system.(3) GIS as a platform for eligible, and spatial factors raster overlay, the formation of new urban grid overlay results Yanqing map, based on clustering method, hierarchical cluster analysis to establish the evaluation model, to make classification pedigree chart Implementation of geological hazard zoning, the formation of the study area Yanqing Town Comprehensive Zoning geological hazard map.(4) According to the Geological Hazard Zoning District of Yanqing Town Planning partition geological hazard assessment, geological hazard study area is divided into four levels :a small risk ofⅠarea, smallⅡrisk areas, medium-risk areas. and risk region.