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Taking machinery roadway, ventilation passage of Roadway 8203 of Guobei Mine in Huaibei Mining Group as the research background, applying basic theory of modern solid mechanics, interaction mechanism between metal bracket and bolt were studied in the condition of large loose circle, high ground pressure soft-rock roadway. Several key technologies of extremely loose and extra thick coal seam in support- ing overall along goaf roadway were introduced in detailed. The functional mechanism of key technologies was not only analyzed in detail, but also on-site industrial tests were conducted. Good action effect of bolt and double resistant cloth was demonstrated in roadway of extremely loose coal seam, emphasizing the com- prehensive effect of the composite support structure "metal bracket + bolt + double resistant cloth". On the one hand, the research results provided a significant effect, low-cost rock support technology; on the other hand, it also further improved the support theory of rock roadway. It has certain reference value for roadway supporting design in any case. It made the adjacent two mining areas into one and produced enormous eco- nomic benefits. KEYWORD: the extremely loose and extra thick coal seam, Overall Roadway along Goaf, key technology, industrial test

Supporting Mechanism and Technology of Roadway Overall along Goaf in Extremely Loose and Extra Thick Coal Seam