Influence of dynamic pressure on deep underground soft rock roadway support and its application |
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| Affiliation: | 1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China;2. Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Shangdong University of Science & Technology, Qingdao 266590, China;1. Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining & Technology, Xuzhou 221116, China;2. School of Safety Engineering, China University of Mining & Technology, Xuzhou 221116, China;1. School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou 221116, China;2. Ministry of Education’s Key Lab of Coal Processing and High Efficient Clean Utilization, Xuzhou 221116, China;3. Advanced Analysis and Computation Center, China University of Mining & Technology, Xuzhou 221116, China;4. School of Resources and Geosciences, China University of Mining & Technology, Xuzhou 221116, China;1. School of Resources and Earth Science, China University of Mining & Technology, Xuzhou 221116, China;2. Key Laboratory of Coalbed Methane Resource & Reservoir Formation Process, China University of Mining & Technology, Xuzhou 221008, China |
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| Abstract: | Due to high ground stress and mining disturbance, the deformation and failure of deep soft rock roadway is serious, and invalidation of the anchor net-anchor cable supporting structure occurs. The failure characteristics of roadways revealed with the help of the ground pressure monitoring. Theoretical analysis was adopted to analyze the influence of mining disturbance on stress distribution in surrounding rock,and the change of stress was also calculated. Considering the change of stress in surrounding rock of bottom extraction roadway, the displacement, plastic zone and distribution law of principal stress difference under different support schemes were studied by means of FLAC3D. The supporting scheme of U-shaped steel was proposed for bottom extraction roadway that underwent mining disturbance. We carried out a similarity model test to verify the effect of support in dynamic pressure. Monitoring results demonstrated the change rules of deformation and stress of surrounding rock in different supporting schemes. The supporting scheme of U-shaped steel had an effective control on deformation of surrounding rock. The scheme was successfully applied in underground engineering practice, and achieved good technical and economic benefits. |
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| Keywords: | Deep soft rock roadway Dynamic pressure impact Similarity model test Combined support Ground pressure monitoring |
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