Research on cut gob-side entry retaining in thin coal seam of Tangshan ditch
ZHANG Guofeng1，2，XU Youqing3，GE Pengtao3
(1. School of Civil and Architecture Engineering，China University of Mining and Technology，Beijing 100083，China；
2. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，
Beijing 100083，China；3. Shanxi New Tangshan Ditch Coal Limited Company，Datong，Shanxi 037002，China)
Abstract：The triangle hanging plate is easily formed and hard to fall if the caving zone contains the thick and hard stratum，which produces high pressure to the gob-side entry retaining. The 8820 coalface mining without pillars with the thick and hard sandstone roof at Tangshangou in Datong was studied. The difference of cracked structural feature between ordinary filling entry retaining and joint-cutting gob-side entry retaining roof was analyzed. The deformation process of surrounding rock was investigated. The joint-cutting with the reasonable parameter of hard stratum roof in the caving zone resulted in the lost of the constraint of the direct roof and basic roof at the gob-side boundary in the range of the joint-cutting height. The hanging plate was sheared enough to fall off the roof along the structural surface of joint-cutting，and the impact load was reduced. The results of the numerical analysis with the software UDEC indicated that the joint-cutting was beneficial to the waste rock fall and supported the stratum covered above. The joint-cutting moved forward the touch point of the waste rock of the stratum covered above basic roof，limited the rotation of the basic roof and the pressure of surrounding rock caused by the sink action and reduced the deformation of the surrounding rock obviously. The test under the well suggested that the complex techniques of high constant resistance and large deformation anchor rope of roof，the dense pillar reinforced on the side of tunnel，the dense block rock point pillar and the technology of advanced focused power blast of joint-cutting could cut the roof on the gob-side effect and form a complete tunnel that every index could satisfy the requirement of working surface.
钱鸣高，石平五，许家林. 矿山压力与岩层控制[M]. 徐州：中国矿业大学出版社，2010：65-99.(QIAN Minggao，SHI Pingwu，XU Jialin. Ground pressure and strata control[M]. Xuzhou：China University of Mining and Technology Press，2010：65-99.(in Chinese))
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2016, Vol. 35 
