1) difficult to be fallen
2) fall [英][fɔ:l] [美][fɔl]
The hing girder assorting with π type steel used in broken caving roof in Nanshan Coal Mine,Hegang Mining Bureau can not only solve the roof fall accident but also meet the needs of section mining support.
鹤岗矿务局南山煤矿在破碎易冒落顶板中 ,铰接顶梁与π型钢梁配套使用 ,不仅解决了顶板易发生的抽漏冒顶事故 ,而且满足了分层开采各分层顶板支护的要
Through observing and analyzing to roof and wall of spot in 6114 workface,this paper sum up rules and features of rib spalling and roof fall under complicated geology condition in sub-level caving mining workface,it raises a series of roof control measures and gets good result.
通过对 6 114工作面顶板、煤壁现状的现场观测和理论分析 ,总结出了复杂地质条件下综放工作面煤壁片帮、端面顶板冒落的规律和特点 ,提出了一系列复杂地质条件下综放工作面顶板控制措施 ,现场应用后取得了较好的效
3) Roof fall
The roof falling types of worked out area in south mining district are pointed out, which are scattered falling and batch falling.
指出南区采空区顶板冒落形式 ,一是以散体形式零星冒落 ,另一是批量冒落。
4) roof falling
To predict roof falling,AE field tests have been conducted and AE monitor holes are laid out based on the block analysis.
To predict roof falling) AE field tests have been conducted and AE monitor holes are laid out based on the block analysis.
5) cover rock caving
Mechanism and protection on subsidence and cover rock caving of mining;
6) caved gangue