Abstract: Based on the investigation of ground collapse in the Guanghua basin, it analyzes the types of ground collapse, spatiotemporal distributing characteristics, control factors and the formation mechanism of karst collapse. The results show that the ground collapse is mainly concealed karst collapse in carbonate rock distribution area, and that the development degree of karst and the overlying loose rock soil mass are the basic formation conditionssubstantial changes in groundwater table and vibration load are the induced dynamic formation conditions of the karst collapse. Regarding the genetic characteristics of ground collapse, some preventive measures, such as controlling underground water level variation and reducing the disturbance of soil, are proposed. The study provides good reference for city construction in the Guanghua basin.

Key words: Guanghua basin; karst collapse；spatiotemporal distributing characteristics; formation mechanism; preventive measures