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《岩石力学与岩土工程学报(英文版)》 2011-S1
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Experimental investigation on behaviors of bolt-supported rock strata surrounding an entry in large dip coal seam

Ke Yang1, 2, 3*, Guangxiang Xie1, Guowen Tan4 1 Key Laboratory of Integrated Coal Exploitation and Gas Extraction, Anhui University of Science and Technology, Huainan, 232001, China 2 Key Laboratory for Exploitation of Southwestern Resources and Environmental Disaster Control Engineering of Ministry of Education, Chongqing University, Chongqing, 400440, China 3 Huainan Mining Industry (Group) Co. Ltd., Huainan, 232001, China 4 Chongqing Research Institute of China Coal Technology and Engineering Group Co., Chongqing, 400440, China  
In order to investigate the behaviors and stability of rock strata surrounding an entry with bolt supporting in large dip coal seams (LDCSs) dipping from 25° to 45°, a self-developed rotatable experimental frame for similar material simulation test was used to build the model with the dip of 30°, based on analyses of geological and technological conditions in Huainan mine area, Anhui, China. The strata behaviors, such as extracting- and mining-induced stresses development, deformation and failure modes, were synthetically integrated during working face advancing. Results show that the development characteristics of mining-induced stress and deformation are asymmetrical in the roadway. The strata behaviors are totally different in different sections of the roadway. Because of asymmetrically geometrical structure influenced by increasing dip, strata dislocating, rock falling and breaking occur in roof. Then, squeezing, collapsing and caving of coal happen in upper- and lower-rib due to shearing action caused by asymmetrical roof bending and dislocating. Owing to the absence of supporting, floor heaving is very violent and usually the zone of floor heaving develops from the lower-rib to upper-rib. Engineering practices show that, due to the asymmetrical characteristics of rock pressure and roadway configuration, it is more difficult to implement bolt supporting system to control rock stability of roadways in LDCSs. The upper-rib and roof of entries are the key sections. Consequently, it is reliable to use asymmetrical bolt-mesh-cable supporting system to control rock stability of roadways based on the asymmetrical characteristics of roadway configuration and strata behaviors.
【Fund】: Supported by the National Basic Research Program of China (2010CB226806);; the Visiting Scholar Foundation of Key Laboratory for Exploitation of Southwestern Resources and Environmental Disaster Control Engineering;; the Outstanding Innovation Group Program of Anhui University of Science and Technology
【CateGory Index】: TD823.21
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