This paper summarizes the factors that affect lump coal ratio of coal faces in an all round way and discusses emphatically the blasting parameters and techniques of enhancing lump coal ratio.
全面总结了影响炮采工作面块煤率因素，并着重讨论了提高块煤率的爆破参数与技术。
2
This paper describes the technique ways and achievements of large round multi-row short-delay blasting experiments and audies at Shuichang Iorn Mine.