Mechanism of gob-pillar interaction for subcritical panels and its application
WANG Pengfei1，2，ZHAO Jingli1，WANG Zhiqiang1，SUN Zhongwen1，XU Chunhu1，SONG Ziyu1，SU Yue1
(1. School of Resources and Safety Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；
2. Mining and Mineral Resources Engineering，Southern Illinois University，Carbondale，Illinois 62901，United States)
Abstract：Mechanism of gob-pillar interaction for subcritical panels was studied against Zhenchengdi coal mine through theoretical analysis，physical modelling，numerical modelling and field observation. Different panel layouts were found to lead to the different shapes of panel and coal pillar. The gob behavior has the significant influence on the stress distribution and failure of the coal pillar which should not be ignored in the numerical modelling. The width of limit equilibrium zone of coal pillar is derived. When a slice of multiple longwall slices of a coal seam is being mined，the mining height is reduced leading to the reduction of the width of the limit equilibrium zone，and so are the high seam longwall mining and split-level longwall mining(SLM) due to their elevating section. The angle of break plays an important role in gob-pillar interaction. The angles of break were obtained and were used for numerical modelling. An expression for the panel width L，the span of the uppermost key stratum L1 and the angle of break θ is obtained. The numerical modelling shows that the more load the gob bears，the less the abutment pressure and vice versa，which is the result of the gob-pillar interaction for subcritical panels. The abutment pressure，stress concentration factor and failure zone were larger and the elevation of failure zone was lower if the influence of gob was not taken into account. According to the mechanism of gob-pillar interaction for subcritical panels，the air intake way was set under the gob edge(with roof along the gob rather than rib) in the least stressed zone in the entire panel system，and the air exit way was arranged along the roof，as such，the ground control problems for both gate roads are solved.
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2017, Vol. 36 
