PDF(3901 KB)
Pre-grouting Technology for Broken Roof of Lower Coal Seam of Splitting and Merging Coal
Zha Wenhua,Hua Xinzhu, Huang Rong,Xiong Lijun
Chinese Journal of Underground Space and Engineering ›› 2012, Vol. 8 ›› Issue (5) : 1014-1020.
PDF(3901 KB)
PDF(3901 KB)
Pre-grouting Technology for Broken Roof of Lower Coal Seam of Splitting and Merging Coal
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