工作面端头三角区沿空巷道强矿压显现与应力转移分析  

An analysis on strong strata behaviors and stress transfer of the roadway approaching gob in triangle area of the face end

作　　者：杨敬轩[1] 刘长友[1] 于斌[1,2] 吴锋锋[1] 

机构地区：[1]中国矿业大学矿业工程学院煤炭资源与安全开采国家重点实验室,江苏徐州221116 [2]大同煤矿集团有限责任公司,山西大同037003

出　　处：《采矿与安全工程学报》2016年第1期88-95,共8页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51174192);江苏省"333"培养基金项目(BRA2010024);中国博士后科学基金项目(2015M581896)

摘　　要：大同矿区同忻煤矿8105工作面5105沿空巷超前支护段矿压显现明显,来压强度大,巷道变形与单体支柱折损严重,严重影响了回采巷道的正常使用。在分析工作面沿空巷强矿压显现特征的基础上,得到了巷道强矿压主要影响因素,提出对工作面顶板进行双向应力转移以降低端头三角区集中应力的方法。研究表明:工作面端头双向支承压力将形成端部三角区高应力集中,对工作面沿空巷超前支护段的强矿压显现具有重要影响;采用改变形式的三参数威布尔函数对双向支承压力进行理论分析,得到了工作面端头三角区高应力大小及区域分布特征;提出了双向应力转移的方法,降低了沿空巷超前支护段围岩应力。现场实践中,通过对工作面5105沿空巷及顶回风巷顶板采取水压致裂技术后,工作面5105巷超前支护段强矿压显现得到明显改善,巷道变形量明显降低,保证了工作面的正常生产。There are obvious strata behaviors in the forepoling segment of No.5105 roadway approaching gob in the working face No.8105 in Tongxin coal mine in Datong mining area. The roadway deformation and single pillar breakage are serious, and the normal use of the roadway is affected seriously too. Based on the analysis of the characteristics of the strong strata appearing in the roadway approaching gob, the main factor of the strong strata has been gained, and simultaneously the method of transferring bidirectional stress of the face roof to reduce the stress concentration in the triangle area of the face end has been proposed. The research shows that： the superposition of the bidirectional bearing pressure in the face end can bring out high stress concentration in the triangle area of the face end, which is the essential influence factor on the strong strata to the roadway forepoling segment; the three-parameter Weibull function in a changed form is adopted to analyze the superposition of the bidirectional support pressure, and the high stress magnitude and stress regional distribution in triangle area of the of face end is gained too; the technical measures of the stress transfer to reduce the stress distribution of the roadway approaching gob has been proposed. Field practice indicates that after using hydraulic fracturing technology to the roof of No.5105 roadway approaching gob and the return air roadway, the forepoling segment pressure of the No.5105 roadway has been significantly improved, and the amount of roadway deformation has been obviously reduced, ensuring the normal production of the coal face.

关 键 词：端头三角区 沿空巷道 巷道强矿压 威布尔函数 应力转移 

分 类 号：TD821[矿业工程—煤矿开采]