Project(2015CX005)supported by Innovation Driven Plan of Central South University,China;Project(2016zzts451)supported by the Graduate Innovation Fund of Central South University,China;Project(2016JJ21)supported by the Fundamental Research Funds for the Hunan Province,China;Project(2012BAB14B01)supported by the National Science and Technology Pillar Program during the 12th Five-year Plan Period of China
Undercut is one kind of important spaces to place the mining blocks in the mass underground mining. This structure is also used as a compensation space during blasting. In the process of underground mining in the frag...