Karst geological survey and analysis of its development characteristics in Xuzhou

Based on the projects of Xuzhou urban geological survey and Xuzhou karst collapse investigation, stuck to karst geological characteristics and urban construction demand for karst geological survey with full use of the previous data, the geological survey of bare karst area and covered karst area has been respectively carried out, which is aimed to find out the karst development characteristic in urban planning area. At the same time, the geophysical exploration, drilling and some other methods have been used for exploration and validation. Then the accuracy of karst geological survey in this area has been improved effectively. As well, the author has analyzed the karst formations, karst exposed conditions and development degree. The karst development in this area is mainly superficial karst since the Cenozoic and the degree is generally controlled by geological structure which is distributed with the type of “strong-weak” in the northeast direction. Along the Old Yellow River fault zone, the karst of O2m and ∈2z develops very well.