Study On The Characteristics And Tectonic Convergence Of Karst Collapses In Zaozhuang City

Karst collapses is the main geological disaster type which account for more than 30% of our country's karst area. In recent years, the rapid development of the industry makes the problem of karst collapses increasingly severe. ZaoZhuang district in Shandong province, which makes a feature of energy exploitation, is the important industrial city in our country. With the fast development of the industry, enlargement of city scale and increasing of human being's economic activity, the karst collapses take place in very high frequency, which bring huge threaten and loss to people's life and properties. In this paper, we reconnaissance, measure, in- filling figure, sampling and experiment with the point of karst collapses in central district of Zaozhuang city since 1981. Analyzing and discussing the formation co- ndition, growth status, distributing feature and the structure characteristic of karst collapses in Zaozhuang in detail, then predicting and forecasting it according to the analytical results. Concretely, the following conclusions were obtained:(1) Combine with physical mechanics property, thickness, stratum condition, hydrological conditions and groundwater exploitation capacity of overlying caprock, the formation condition and reason of karst collapses in Zaozhuang were synthetically discussed.(2) Based on the detail analysis of the data on hand and via investigation and research on the spot, the severe sequent caused by the karst collapses in Zaozhuang district in recent 20 years was summed up. Combined with the actual case of karst collapses in Zaozhuang, we also discussed the harm of karst collapses had done to the resource and environment sustainable development from the point of karst collapses's destroying soil resource, polluting ground water and damaging inhabitation environment of human beings. The characteristic, distribution rule and growth feature of karst collapses were also analyzed.(3) According to the growth and distribution characteristic of karst collapses in Zaozhuang district, the relationship between karst collapses and geological tectonics was discussed by combination of macro-surveying, mini-measuring and micro-analysis. The results indicated that, geological tectonics provides indispensable and impersonal condition for karst collapses in Zaozhuang district.(4) Based on the above results, taking the distribution characteristic of tectonic fissures net as the main factor, combined with condition of overlying caprock and groundwater hydrodynamic, the position of karst collapses in Zaozhuang is predicted elementary, and the relatively defense measurement was put forward.