Experimental Study on Solidification Slope Erosion of Surface Glacial Drift in Pulang Copper Mine Under Heavy Rainfall
Natural caving method mining will form a subsidence area,and the slope of the subsidence area is extremely easy to be unstable under the erosion effect of rainfall to form an underground debris flow disaster.To evaluate the effect of grouting solidification on the resistance of glacial drift slopes to heavy rainfall erosion,an indoor model of collapsed pit slopes was established using similarity theory.The anti-erosion performance,runoff and sediment production characteristics of solidification glacial drift slope under different soil-slurry ratios were studied through artificial rainfall and grouting experiments,revealing the soil erosion process and slope instability mechanism.The results show that the initial runoff production time increase linearly with the increase of soil-slurry ratio,while the sediment intensity decrease linearly with the increase of rainfall duration.The evolution of soil erosion can be divided into five stages,including impact infiltration,water-filled softening,stripping and cutting,migration and crossing,and steady flow balance.The sediment consolidation effect and permeability resistance of slope with soil-slurry ratio of 5∶1 are 28.8 times and 11.3 times of that of original glacial drift slope,and the slurry solidification effect was significant.This study can provide a support for the disaster prevention and control of the subsidence areas in the surface collapsed zone of natural caving mining method.
万方数据
维普
