To recover the remainder coal in the side slope walls of surface mine by use of underground coal winning method can increase coal recovery rate and mine economic effect.
采用地下台阶式开采法回采露天矿端帮煤可大大提高煤炭资源回收率和矿山经济效益；
2
For a long time he involved in tunnel & underground work management and technical research, by winning many times prizes of national and provincial levels, with many papers published.