The Characteristic And Risk Evaluation Of Geological Hazard Of Mizhuo Highway(Mountain Segment Of Beijing)

With the rapid increase of population in our country, the rapid development of economy, the urban size grows, traffic conditions become an important factor of affect the urban development. The highway enterprise is also booming in our country, the provinces and cities have started a considerable scale in highway engineering, and has accumulated many successful experiences, because of insufficient understanding in geological disaster risk assessment and construction site suitability evaluation, there are many expected problems in the construction process and completion of the opening process. Therefore, In highway construction process, how to identify the types of geological hazards, development characteristics and influencing factors, and make a comprehensive evaluation of geological hazards, it is significant to ensure that continuous and stable development of the highway engineering has become an important subject of urban geological environment research.This paper research is based on mizhuo highway project(mountain segment of Beijing), through the research of field observation and analysis of the existing geological data, the most important factors is selected as evaluation factors, using AHP to determine the weight of each evaluation factor, establish the fuzzy comprehensive evaluation model, make a risk comprehensive evaluation of the geological hazards of the study area, and draw out the map of devided zone of geological hazards evaluation by using Mapgis.Through analysis on geological environment conditions in the study area, focusing on the analysis of topography, rock properties, geological structure and geological disasters, the topography and geomorphic features, meteorological and hydrological and groundwater characteristics, characteristics of geological structure, history disaster situation and human activities as the first layer factors, topography, terrain elevation, gully development degree, average annual rainfall, groundwater characteristics, rock mass structure, fracture density, ground motion peak acceleration, disaster density, the scale of the disaster and human activities as the second layer factors, { Small risk, medium risk, risk is big } as the evaluation set, evaluation index system is established and the weight of each evaluation factor is determined by using AHP. Then divide the survey region into 1469 cells(200m×200m) through square grid units divide method. The grid research area unit is evaluated by using fuzzy comprehensive evaluation method. Drawing the evaluation factor of subdivision graph by using Mapgis, using Excel to manage each grid unit attribute data and evaluation data, and connecting the data with mesh map, finally completed area evaluation zoning map of risk evaluation of geological hazards of mizhuo highway(mountain segment of Beijing). The final results can provide reference for engineering construction.