Abstract: Sinkhole is one of the major geological hazards in Quaternary Soils that covering Zhaoqing, a city in the west Pearl River Delta area. This paper summarizes three typical sinkhole collapse modes based on the observed sinkholes in the Zhaoqing City as well as the geological conditions. The entire karst area is divided into 7092 grids as the evaluation units. In each unit, the soil and rock strata; degree of karst development; groundwater activities as well as the tectonic structure are factored. The likelihood of the sinkhole collapses are evaluated by using a comprehensive indices.

Key words: Sinkhole Collapse, Zhaoqing Area, Sinkhole Collapse Modes, Collapse Evaluation