The Influence of Rainfall on Landslide Stability of an Open-Pit Mine: The Case of Haizhou Open-Pit Mine

The Haizhou open-pit coal mine was the largest mechanized open pit coal mine in Asia. This mine was closed down due to resource depletion in July 2005 and has become a national mine park. In 2015, with the development of slope cracks in the mining park, signs of resurrection landslide have appeared, severely threatening the safe operation of the mine park. It was discovered that fault and rainfall infiltration were the key factors affecting the slope stability through field geological survey and risk zoning; following, the finite element method was utilized to numerically calculate the slope penetration law of dangerous areas, while the distribution of pore water pressure and the safety factor variation under different rainfall conditions were obtained; finally, in this paper, proposes a dangerous slope strengthening scheme through the high constant resistance and large deformation anchor cable (CRLD) utilization. The slope stability prior to and following CRLD anchor reinforcement was numerically calculated. The treatment effect of CRLD anchor reinforcement system on the rainfall-induced landslide area fault was explored.