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Analysis of Geological Disasters at the Coal Mining Area in North of Xianyang

ZHANG Zhao-feng1,LIU Tao2,GUO An-lin1(1.The Key Laboratory of Continental/Department of Geology,Northwest Univercity,Xi'an 710069,Shaanxi;2.Groundwater Management Monitoring Bureau of Shaanxi Province,Xi'an 710003,Shaanxi)  
For 5 counties(Changwu,Binxian,Xunyi,Yongshou,Chunhua)in the northern part of Xianyang in Shaanxi,there exist more than 20 coal mines.With mining coal and the expansion of underground mined-out area,a series of geological disaster emerge,there are serious influences for life and property in the local residents.The main types of geological disasters are ground subsidence,ground fissures,landslide and Collapse.The paper analyzes the causes of geological disasters in this region,deduces mathematical model in the Jacob presumption,arrive at the conclusion which control of geological disasters are coefficent of storage,broadness of groundwater and drop quantity of groundwater which is the only variable factor and the major factor in geological disaster controlling.In addition,we can forecast the occurrence and development of geological disasters by mathematical models in the region.
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