Roof Bolting Anchoring Performance Research on the Entry under the Gob of Close-Distance Coal Seam [PDF]
Geofluids, 2022 Seam spacing plays a crucial role in selecting roof bolting of the close-distance coal seam. This work utilized three methods to determine the minimum roof bolting seam spacing of the lower coal seam (LCS) entry after the upper coal seam (UCS) mining ...
Yongjie Yang, Gang Huang, Haiyu Ji
doaj +3 more sources
Study on Failure Characteristics and Control Technology of Roadway Surrounding Rock under Repeated Mining in Close-Distance Coal Seam [PDF]
Mathematics, 2022 In this study, taking the Sheng’an coal mine as an engineering background, the failure characteristics of the surrounding rock of a roadway under repeated mining in a close-distance coal seam is comprehensively illustrated through field measurements (e.g.
Yuqi Shang +5 more
doaj +5 more sources
Study on Coal Pillar Setting and Stability in Downward Mining Section of Close Distance Coal Seam [PDF]
EnergiesTo investigate the reasonable width of a coal pillar in the downward mining section of close-distance coal seams, the stress state of any point below the residual coal pillar in the overlying goaf and the width of a small coal pillar were studied by theoretical calculation, numerical simulation, similar simulation and field monitoring.
Liu Chongyan, Zhao Guangming
exaly +4 more sources
Study on pressure characteristics of coal seam under close mined-out area [PDF]
Meikuang Anquan, 2021 The 10# coal seam of Xiangqiao Coal Mine are taken as the engineering background, the failure of the floor of the overlying goaf and the deformation of the roof strata of the underlying coal seam were analyzed theoretically, and the coal pressure ...
ZHOU Bo, ZHANG Wang, ZHOU Ze, LI Kecheng
doaj +2 more sources
Research of the Backfill Body Compaction Ratio Based on Upward Backfill Safety Mining of the Close-Distance Coal Seam Group [PDF]
Geofluids, 2022 During upward backfill mining of the close-distance coal seam group, the reasonable design of the backfill body compaction ratio (BBCR) of lower coal seam goaf plays a key role in controlling overburden strata movement and deformation. In this paper, the
Xingping Lai +5 more
doaj +2 more sources
Failure characteristics of extra-thick coal seam under goaf based on double yield model [PDF]
Meikuang Anquan, 2022 This paper aims to study the influence of the goaf in the upper coal seam on the overlying ultra-thick coal seam and determine the dislocation distance in the roadway layout of the lower coal seam. Based on finite difference method, this research, takig
XUE Jisheng, ZHAO Tielin, PAN Liming
doaj +2 more sources
Study on reasonable offset of mining roadway under close distance coal seams goaf of rock burst mine [PDF]
Meikuang Anquan, 2021 Aiming at the situation that the top coal of the close distance coal seams is goaf and the remaining 30 m coal pillar, taking the 2-1 coal seam and 2-2 coal seam of Hulusu Coal Mine as the research background, the mechanical model of the upper coal goaf ...
DING Guoli, YU Huihua, SU Shijie, SHI Chaohong, LIU Chenyang
doaj +2 more sources
Floor failure depth of upper coal seam during close coal seams mining and its novel detection method [PDF]
Energy Exploration & Exploitation, 2018 The primary problem needed to be solved in mining close coal seams is to understand quantitatively the floor failure depth of the upper coal seam. In this study, according to the mining and geological conditions of close coal seams (#10 and #11 coal ...
Wei Zhang +5 more
doaj +2 more sources
Study on the Rheological Failure Mechanism of Weakly Cemented Soft Rock Roadway during the Mining of Close-Distance Coal Seams: A Case Study [PDF]
Advances in Civil Engineering, 2020 During the mining of the shallow-buried and close-distance multiple coal seam, the rheological failure of the surrounding weakly cemented soft rock of the roadway in the lower coal seam under the concentrated stress is very rare.
Wenkai Ru +6 more
doaj +2 more sources
The Spatio-Temporal Evolution of Overlying Rock Structure and Mine Pressure Behavior in a Short-Distance Coal Seam Face [PDF]
Geofluids, 2022 This research is aimed at exploring the evolution of overlying strata structure and the ground pressure in the working face mining of close-distance coal seams. By taking the Xiashijie Coal Mine as an example, the direct relationship between the rotation
Yupu Zhou +5 more
doaj +2 more sources