Deformation effect of lateral roof roadway in close coal seams after repeated mining |
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| Affiliation: | 1. State Key Laboratory of Coal Resources and Safety Mining, China University of Mining and Technology, Xuzhou 221008, China;2. School of Mines, China University of Mining and Technology, Xuzhou 221008, China;3. No. 1 Coal Mine of Pingdingshan Tian’an Coal Industry CO Ltd., Pingdingshan 467011, China;1. State Key Lab Cultivation Base, Henan Province Key Lab of Gas Geology & Gas Control, Henan Polytechnic University, Jiaozuo 454003, China;2. School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China;3. School of Resources & Safety Engineering, China University of Mining & Technology, Beijing 100083, China;1. Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Qingdao 266590, China;2. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;3. College of Information Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;1. Jiangsu Key Laboratory for Resources and Environment Information Engineering, School of Environment and Spatial Informatics, China University of Mining & Technology, Xuzhou 221116, China;2. School of Life Science, Jiangsu Normal University, Xuzhou 221116, China;1. State Key Laboratory of Disaster Reduction in Civil Engineering and College of Civil Engineering, Tongji University, Shanghai 200092, China;2. State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China;3. School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China;4. Department of Engineering Technology, University of North Texas, Denton 76207, USA |
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| Abstract: | This paper analyzed the deformation mechanism in lateral roof roadway of the Ding Wu-3 roadway which was disturbed by repeated mining of close coal seams Wu-8 and Wu-10 in Pingdingshan No. 1 Mine. To determine the strata disturbance scope, the strata displacement angle was used to calculate the protection pillar width. A numerical model was built considering the field geological conditions. In simulation, the mining stress borderline was defined as the contour where the induced stress is 1.5 times of the original stress. Simulation results show the mining stress borderline of the lateral roadway extended 91.7 m outward after repeated mining. Then the original stress increased, deforming the roadway of interest. This deformation agreed with the in situ observations. Moreover, the strata displacement angle changed due to repeated mining. Therefore, reselection of the displacement angle was required to design the protective pillar width. Since a constant strata displacement angle was used in traditional design, the proposed method was beneficial in field cases. |
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| Keywords: | Repeated mining Mining stress borderline Strata displacement angle Lateral roof roadway Protective pillar |
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