Projects(51964007,51774101)supported by the National Natural Science Foundation of China;Project(2016-4011)supported by the High-level Innovative Talents Training Project in Guizhou Province,China;Project(2019-5619)supported by the Guizhou Mining Power Disaster Early Warning and Control Technology Innovation Team,China。
Evaluation of the performance of existing support in underground tunnels is of great importance for production and interests.Based on field investigation,the shape and number of joints and fractures were investigated ...