The Research Of The Datong Ground Fissures In Shanxi Province

In recent years, with the country's large requests of coal resources, Datong's mining of coal increases per year. Datong is the country's major coal-producing area and its coal mining's annual output is nearly 200 million ton in 2006.Environmental and ecological issues which caused by over-exploitation has become increasingly prominent. The environmental issues such as the emergence of ground fissures, the decline of groundwater level, the deterioration of water quality, the increase of empty mined areas has been puzzled Datong economy's sustained development. It has great significances to Datong's sustained development by identifying the main causes and the distributions of ground fissures and giving the reasonable handling of proposals.Through the reconnaissance of Datong ground fissures in scene and the analysis of plenty actual data, reached following understandings:First, this article has identified the eleven Datong ground fissures' distribution, size, features and disaster situation by collecting data and additional investigations.Second, this article deeply studied the geological background and quaternary features of Datong ground fissures' formation and make a good foundation to the causes of ground fissures.Thirdly, summed up the causes of Datong ground fissures by analysis Datong geological structures and groundwater exploitation:new construction activity is the controlling factor in the formation of ground fissures; the development of ground fissures has structural nature itself; the existence and activities of the under fault are the direct causes of the formation of ground fissures;forcing collects of underground water accelerated the ground fissures' activities.Fourthly, based a prediction formula of Datong ground fissures on years of testing data and predict the trends of ground fissures activities.Finally, described Datong ground fissures'present situation and gave prevention measures of ground fissure disaster.