Shanxi Highway Earthquake Disaster Risk Division Based On GIS

The Wenchuan earthquake on May 12th has taken great destroys to highways of Shanxi province, it caused great destruction, avalanches, landslide and debris flow and roadbed subsidence geological disasters such as secondary, affecting the highway "lifeline project" function and it also brought post-earthquake rescue and recovery very adverse effects. There will be important guiding significance on the highway hazard prevention and network planning to conduct post-earthquake risk assessment of highway secondary disasters.The paper take Shanxi Province as the object of study, through the analysis of the type after shaking the Shanxi Province road secondary geology disaster, the distribution rule and send the disaster mechanism's investigation and the analysis, the Shanxi Province earthquake secondary disaster mainly have the pitch geology disaster, the mud-rock flow disaster as well as the roadbed cave in three broad headings.The paper selection earthquake intensity, the terrain slope, the ground type, the surface cutting density, the surface cutting depth, the vegetation, the drainage density, the rainfall amount and so on take the pitch geology disaster's risk evaluating indicator, the choice earthquake intensity, the rainfall, the terrain slope and the surface cutting depth take the mud-rock flow disaster's risk evaluating indicator, the choice fault zone characteristic take the roadbed settlement disaster's risk evaluating indicator, established three has ordered by type lives the geological disaster risk evaluating indicator system and the rank division system, and determined each influencing factor the weight. Has completed each influencing factor topic chart level using the GIS technology, through the GIS spatial analysis function, the superimposition has completed each kind of disaster's risk factor index chart.Take superimposes each kind of disaster's risk factor index chart which completes as the foundation, has completed the Shanxi Province road earthquake secondary disaster risk evaluation exercise through the superimposition. The Shanxi Province road earthquake secondary disaster risk will divide according to the risk evaluating indicator size into the micro danger, mild dangerous, moderate dangerous, the grave danger and the extremely grave danger five risky rank, and Shanxi Province will divide into 16 risky district,2 micro warning areas,1 mild warning area,6 moderate warning areas,6 serious warning areas and 1 extremely serious warning area, have completed the Shanxi Province earthquake secondary disaster region risk appraisal.In this foundation the Shanxi Province road network chart (mainly will be country province skeleton line) with the Shanxi Province road earthquake secondary disaster risky district chart superimposition, completes the Shanxi Province road network earthquake secondary disaster risk appraisal. the paper research results and the Shanxi Province actual situation tally basically, guarantees smooth, the disaster prevention disaster reduction and the road network plan to the lifeline project and so on has certain instruction function.