Results 11 to 20 of about 1,100 (178)

Roof Bolting Anchoring Performance Research on the Entry under the Gob of Close-Distance Coal Seam

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   +2 more sources

Study on reasonable position of mining roadway under repeated mining overburden structure in shallow buried close distance coal seam: A case study [PDF]

Scientific Reports
In order to determine the reasonable position of the mining roadway in the first mining face of 3-2-2 coal seam under repeated mining of shallow-buried close-distance coal seam group in Shigetai Coal Mine of Inner Mongolia Mining Area, a method for ...
Kaijun Miao, Shihao Tu, Hongsheng Tu, Long Tang, Hongbin Zhao, Benhuan Guo, Ke Lv, Yihang Ma   +7 more
doaj   +2 more sources

Study on the influence of stress relief in close-distance coal seam Goaf and roadway excavation disturbance on surrounding rock. [PDF]

Sci Rep
Abstract To investigate the influence of pressure relief in close-distance coal seam goaf and roadway excavation disturbance on surrounding rock stability, this study takes the large-section open-off cut of Ⅱ8224N as the research object and employs methods including RQD rock mass quality evaluation, FLAC3D numerical simulation, similar ...
Liu Z, Chen M.
europepmc   +3 more sources

Field and numerical investigations of gateroad system failure under an irregular residual coal pillar in close‐distance coal seams [PDF]

Energy Science & Engineering, 2019
The Gaojialiang Coal Mine in Inner Mongolia in China was used as an example to investigate the process of chain pillar and gateroad failure in the lower coal seam under the effect of an irregular residual coal pillar in the upper close‐distance coal seam.
Hefu Shang, Jianguo Ning, Shanchao Hu, Shang Yang, Pengqi Qiu   +4 more
doaj   +2 more sources

Study on Failure Characteristics and Control Technology of Roadway Surrounding Rock under Repeated Mining in Close-Distance Coal Seam

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, Dezhong Kong, Shijiang Pu, Yu Xiong, Qiang Li, Zhanbo Cheng   +5 more
doaj   +3 more sources

Mechanical mechanism of overlying strata breaking and development of fractured zone during close-distance coal seam group mining

International Journal of Mining Science and Technology, 2020
This study mainly investigates the mechanical mechanism of overlying strata breaking and the development of fractured zones during close-distance coal seam group mining in the Gaojialiang coal mine.
Jianguo Ning, Jun Wang, Yunliang Tan, Qiang Xu   +3 more
doaj   +3 more sources

Research on location optimization and application of the gob-side entry retaining by roof cutting in close-distance coal seams [PDF]

Scientific Reports
Compared to traditional long-wall mining, the gob-side entry retaining by roof-cutting (GERRC) technology reduces the amount of entry excavation by 50%, and recovers the previously wasted coal pillar resources, which has obvious superiority in mining ...
Qiang Fu, Jun Yang, Yuxuan Liu, Chuanjiu Zhang, Yubing Gao, Hainan Gao, Qing Ma   +6 more
doaj   +2 more sources

Mechanical analysis and application of floor failure mechanism under repeated mining in close-distance coal seams. [PDF]

Sci Rep
The stress state of primary rocks is redistributed during coal mining, which leads to deformation and failure of the floor strata. Coal seam floor experiences repeated additional stress from the mining of two overlying seams in close-distance mining.
Li Y, Yao Y, Zhu T, Zeng F, Chang G.
europepmc   +3 more sources

Study on Coal Pillar Setting and Stability in Downward Mining Section of Close Distance Coal Seam

Energies
To 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   +3 more sources

Test of roof interception directional drilling for close distance coal seam group gas control in Qidong Coal Mine

Gong-kuang zidonghua, 2021
In the existing methods of close distance coal seam group gas control, there are problems such as large engineering quantities, high cost and long cycle.
ZHANG Chaoju1, FANG Jun2, YANG Yali1, WANG Xian2, YANG Xiaoji1   +4 more
doaj   +2 more sources