| Summary: | Sanzhou basin in Gaoming District of Foshan City is selected as the research area. data of regional geology, geological structure, engineering geology, hydrogeology, environmental geology and historical geological disasters in the study area are collected systematically, the characteristics of karst collapse are found out through field investigation. And the spatial-temporal distribution law is analyzed. The results show that: (1)The scale of karst collapse is mainly small, its plane shape features are mainly circular and quasi circular, and its profile shape features are mainly funnel-shaped. With the increase of the overburden thickness, the profile shape features of karst collapse generally change from circular-shape to jar-shape to funnel-shape and then to disc-shape. (2)The spatial distribution of karst collapse is affected by stratum lithology, geological structure, overburden thickness and its structure, groundwater runoff and human engineering activities. (3)The temporal distribution of man-made karst collapse is closely related to mining activity and drilling construction. The temporal distribution of karst collapse induced by nature is mainly during the alternate period of drought and flood (especially from March to April).
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