Experimental studies on the mechanical properties and deformation & failure mechanism of U-type confined concrete arch centering |
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| Affiliation: | 1. Geotechnical & Structural Engineering Research Center of Shandong University, Jinan 250061, China;2. Key Laboratory of Safety and High-efficiency Coal Mining, Ministry of Education (Anhui University of Science and Technology), Huainan 232001, China;3. Longkou Coal Electricity Co., Ltd., Longkou 265700, China;4. Yankuang Group Co., Ltd., Post-doctoral Research Center, Zoucheng 273500, China;1. Pure Technologies, 3420 State Route 22 West, Suite 130, Branchburg, NJ 08876, USA;2. Lebanese American University, Department of Civil Engineering, 211 E 46th St., New York, NY 10017, USA;1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China;2. School of Engineering and ICT, University of Tasmania, TAS 7001, Australia;3. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, Shandong 250061, China;4. Yan Zhou Coal Ming Co., LTD, Zoucheng, Shandong 273515, China;1. Key Laboratory for Geo-mechanics and Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China;2. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China;3. School of Civil Engineering and Architecture, University of Jinan, Jinan 250022, China;1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China;2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, School of Civil Engineering and Architecture, Wuhan University, Wuhan, Hubei 430072, China;3. Gubei Coal Mine, HuaiZhe Mining-Electricity Industry Limited Liability Company, Huainan, China;4. Jinan AoKe, Mine Engineering Technology Co., Jinan, China;1. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China;2. Post-Doctoral Scientific Research Station, Yankuang Group Company Limited, Zoucheng, Shandong 273500, China |
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| Abstract: | To solve the support problems of high stress roadways in deep mines, we developed a new 3D U-type confined concrete support system from the conventional U-type steel arch centering. Its core is the U-type confined concrete (UCC) arch centering. With a real scale mechanical test system for the confined concrete arch centering in underground engineering and numerical calculation methods, we studied in depth on the mechanical properties and deformation & failure mechanism of UCC arch centering (UCCAC). The results of the study show the yielding load and the limit load of UCC29 arch centering is 1230 kN and 1310 kN respectively in even pressure loading conditions; and a slight difference between the laboratory test and the numerical simulation on these two is 8.86% and 12.5% respectively. The deformation form of the arch centering is “vault uplifting, legs introverting and the overall shape becomes oval”; and the largest deformation occurs between the middle of the legs and the arch centering springing. The deformation and failure mechanism of arch centering is the partial strength failure causes the entire arch centering to lose its stability. The application on site shows the UCCAC has a superb effect on the surrounding rock control; therefore, the UCCAC is a new effective support for the high stress roadways in deep mines. |
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| Keywords: | Deep mine Confined concrete arch centering Mechanical property Deformation and failure mechanism Laboratory test Field test |
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