Study of inclined gravel cushion against rolling stones

HE Manchao; ZHU Chun; TAO Zhigang; GU Ming; YANG Wei

Abstract：During strip mining,rockfall threatens the safety of workers and equipment.To effectively control the rockfall of high-steep slope,Nanfen Open-pit Iron Mine of Benxi Iron&Steel (Group) Co.,Ltd.was taken as an example,the calculations of total kinetic energy equation and velocity during the process of rockfall collision were established,and Geo-slope simulation was used to analyze the slope stability of 9 geological profiles to identify the hazard zone of rockfall.The method that platform with converse inclined gravel cushion was put forward,which had a good function to reduce the kinetic energy of rolling stones,Rocfall procedure was applied to calculate the movement locus and movement characteristics of rockfall with 5°,10°,15° and 20° inclined gravel cushion.The results indicate that the method can control rockfall effectively,as the cushion angle increases,the control effects on rockfall enhance,but the relative growth rate reduces gradually.Therefore,it is necessary to determine the reasonable cushion angle,which can achieve the effective control effect and save protection costs,so as to ensure the safe and sustainable exploitation of the open-pit mine.