Brief analysis of distribution and influence factor of table-board shallow overburden type karst collapse in central Guizhou Plateau

Qianzhong Plateau table is in the second topographic step of Guizhou Province, with an average altitude of 800-1，600 m. The area is characterised by widely distributed soluble rocks, extremely developed karst landscapes, thin Quaternary soil layers and shallow groundwater with strong groundwater flow dynamics. Karst collapse is one of the major geological hazards in this area. In this paper, based on the statistical data of karst collapse in central Guizhou, the distribution and influencing factors of the karst collapse were analyzed. The results showed that 83.8% of the karst collapse were distributed in the peak valleys and karst valley, and 97.5% of karst collapse was distributed in clay with layer thickness of 1-10 m, and 83.7% of karst collapse is distributed in dolomite formation in Guanling Formation of the middle Triassic strata and Anshun Formation of the early and middle Triassic strata, and 73.3% of karst collapse is distributed along the fracture and fold zones, of which the groundwater is the most important trigger in the area. In terms of human factors, it is closely related to groundwater mining intensity and urbanization process, which occurs along with the urbanization process and the increase of pumping activities.