According to the special requirements of secondary mining of resources in gateway-and-pillar goaf in extra-thick seams of Shanxi, this paper presents a technica
Reliability and maintainability of mining industry is more in focus than ever, and the mining systems are becoming more complex and the equipment more expensive
<正>Soft rocks are a critical geomaterial presenting several kinds of problems.They present undesirable behaviors such as low strength,disaggregation,high plast