The formative environment and disaster-inducing factors of ground collapse disaster analysis in the Pearl River Delta of ground collapse

Ground collapse is one of the major types of geological disasters in cities of Pearl River Delta. The types of ground collapse include karst collapse and engineering collapse. The formative environment of ground collapse disaster is complex, disaster-inducing factors are various, hazard bearing body is vulnerable and its con-sequences are serious. Human factors arthemain cause of the ground collapse. The karst collapse is mainly due to excessively pumping groundwater, mining oheavy rains. Engineering collapse is mainly due to engineering activi-ties, such as drainage, dewatering, artificial loading, artificial vibration, excavating, surface water seepage and subway construction.