SAFETY CONTROL AND EVALUATION OF ROADWAY WITH SUPER-LARGE CROSS-SECTION AND SOFT-WEAK THICK COAL ROOF
YAN Hong1,2,HE Fulian3,WANG Sigui1,2
(1. School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;2. Key Laboratory of Deep Coal Resources Mining,Ministry of Education,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;
3. Faculty of Resources and Safety Engineering,China University of Mining and Technology,Beijing 100083,China)
Abstract:Field observation,theoretical analysis and in-situ tests and monitoring were carried out in order to tackle the problem of large deformation and roof caving of roadways with super-large cross-sections and soft and weak coal roofs. The reasons of the problem were found to be the weak supporting structure of the roof,the weak connections between the roof and the two side walls of the roadway,and the occurrence of large tensile stress in the middle span of the roof. It was therefore proposed that the cross section of roadway to be equally divided into two parts for excavation one after another with multiple supporting structure(MSS) to strengthen the roof and roof-sidewall connection and reduce the deformation of the roof. A total of 10 factors were found to be vital to evaluate the roof safety. The proposed method was successfully applied to the coal mine at Wujiagou.
严 红1,2,何富连3,王思贵1,2. 特大断面巷道软弱厚煤层顶板控制对策及安全评价[J]. 岩石力学与工程学报, 2014, 33(05): 1014-1023.
YAN Hong1,2,HE Fulian3,WANG Sigui1,2. SAFETY CONTROL AND EVALUATION OF ROADWAY WITH SUPER-LARGE CROSS-SECTION AND SOFT-WEAK THICK COAL ROOF. , 2014, 33(05): 1014-1023.
严 红. 特厚煤层巷道顶板变形机制与控制技术[博士学位论文][D]. 北京:中国矿业大学,2013.(YAN Hong. Mechanism of roof deformation and its control in roadway with extra thick coal seam[Ph. D. Thesis][D]. Beijing:China University of Mining and Technology,2013.(in Chinese))
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