Abstract:Based on the study of slope mode of slightly declined granular structure in Xingqiao,a new mode of safe-cleaning berm is designed for mining with steep working slope. The dint cut and retaining wall are made by using of semi-steep slope. With safety and reliability,the new mode sustains steep slope mining,increases the angle of ultimate slope,and reduces 3%~5% of noneffective overburden amount. In order to analyze and validate the reliability of retaining wall,static loading calculation,ANSYS simulation of impact loading and in-situ test are made. By the calculation of static loading,the berm can withstand the granular extrusion without gliding and capsizing. ANSYS simulation shows that impacting destroy develops gradually. When the sliding masses come from the height of 10 times of the width of the sublevel,the retaining wall will collapse. During the two years of in-situ testing,the new mode of structure keeps safe successfully from coast impact. According to the above results,building a new safe-cleaning berm in 1~5 sublevels is economic measure that can meet the demand of safety.