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《Coal Science and Technology》 2014-07
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Analysis on Hydraulic Support Crushed Mechanism When Fully-Mechanized Coal Mining Face Passed Through Concentrated Coal Pillar Area in Above Seam

ZHOU Hai-feng;Department of Production Management,Shenhua Shendong Coal Group Corporation Limited;  
In order to solve the hydraulic support crushed accident occurred when a fully-mechanized coal mining face passed through concentrated coal pillar area in above seam,a theoretical analysis and a site mine pressure observation method were applied to analyze the causes of the hydraulic support crushed accident when No. 22301 fully-mechanized coal mining face passed through the coal pillar concentrated area in above seam in Shigetai Mine. The paper revealed the mechanism of the hydraulic support crushed accident and provided the relevant prevention countermeasures. The results showed that when coal mining face passed through the concentrated coal pillar 5 ~ 20m,the overburden strata would be broken at the boundary of the concentrated coal pillar and a lined beam type articulated structure would be formed. With the coal mining face pushed forward,the articulated structure formed with the broken rock blocks would have a stability lost by a further rotary movement. Thus an impact role would be occurred to the coal mining face in the low seam,a dynamic mine pressure phenomenon would be easily occurred and a hydraulic support crushed accident would be caused. Therefore the paper provided the measures of the optimized mining design of the coal mining face,pre-fracturing blasting on the concentrated coal pillars in the above seam,inclination adjustment of the coal mining face,mine pressure observation and others,the fully-mechanized coal mining face could be kept away from the influences of the stress concentration,the periodical pressure strength was reduced and the dynamic mine pressure was reduced. Finally,the target to avoid the hydraulic support crushed accident was realized.
【Fund】: 国家高技术研究发展计划(863计划)资助项目(2012AA062203)
【CateGory Index】: TD323
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