Innovation and future of mining rock mechanics -
2021-2-1 · The 121 mining method has been widely used in coal mining (Majdi et al., 2012; He, 2014; Islavath et al., 2016), but it has the following drawbacks: (i) Considerable roadway excavation is required.Approximately 13,000 km of roadways are excavated in China each year (), with significant excavation cost.In addition, it is easy to cause inequilibrium between coal
