Roof falling and ribspalling occurred in any times. To predict roof falling, AE field tests have been conducted and AE monitor holes are laid out based on the block analysis.
为了预报冒落事故，开展了声发射（AE）现场试验，并在块体分析的基础上布置了AE监测孔。
2
Abstract : The coal wall grouting reinforcement technique is an effective measure to prevent and control ribspalling, and its key procedure is the selection of grouting quantity.
摘要 煤壁注浆加固技术是防治煤壁片帮的有效措施，其关键环节在于注浆量的选择。
3
The South ore-bearing zone of Wushan copper mine is mined with ascending horizontal slicing hydraulic fill crosscut mining system. Roof falling and ribspalling occurred in any times.