Current situation and prevention of karst surface-collapse geological disaster in Guangzhou Huadu district

Since 1990s,due to the exacerbation of human construction,there has been serious karst surface-collapse geological disaster in ChiNi Town in Guangzhou Hua Du area.Based on exploration data on the spot,this text analyse the distribution and development features of karst surface-collapse in ChiNi Town systematicly.Studies have shown that the mian cause of the collapse is artificial formation of negative terrain quarry excavation and excessive pumping of groundwater.On this basis,in accordance with the reality of ChiNi Town karst surface-collapse,putting forward some countermeasure about prevent karst surface-collapse.