Results 21 to 30 of about 1,201 (198)

Stability Analysis and Derived Control Measures for Rock Surrounding a Roadway in a Lower Coal Seam under Concentrated Stress of a Coal Pillar [PDF]

Shock and Vibration, 2020
Numerical simulations have often been used in close-distance coal seam studies. However, numerical simulations can contain certain subjective and objective limitations, such as high randomness and excessively simplified models.
Zhuoyue Sun, Yongzheng Wu, Zhiguo Lu, Youliang Feng, Xiaowei Chu, Kang Yi   +5 more
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

Control of the Internal and External Staggered Distance of Coal Mining Face to the Water-Conducting Fissures in the Overlying Strata of the Near Coal [PDF]

Advances in Civil Engineering, 2021
In Northwest China, rainfall is low, water resources are scarce, and the ecological environment is fragile. For shallow-buried and close-spaced coal seams with a thickness of upper coal bed >60∼70 m, the water-conducting fissures of the overlying rock ...
Zhiyuan Jin, Tao Peng
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

Study on the Law of Fracture Evolution under Repeated Mining of Close-Distance Coal Seams [PDF]

Energies, 2020
The western region of China is rich in mineral resources. The vigorous development of mineral resources has exacerbated the environmental and safety problems in the region. One of the important links to solve this problem is to control the development laws and distribution characteristics of the overburdened cracks in the mining of this area.
Feng Cui, Chong Jia, Xingping Lai, Yanbing Yang, Shuai Dong   +4 more
openaire   +4 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

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

Early warning and control methods of coal spontaneous combustion in close distance coal seams in outburst mines [PDF]

Meikuang Anquan, 2022
The coal seam group in the outburst mine has the characteristics of mutual influence in the mining process, the goaf is connected, there are many air leakage places, and the fire prevention work is difficult. In order to accurately predict the coal spontaneous combustion process of the coal seam group near outburst mines, taking Guizhou Fa’er Coal Mine
DONG Xiaoming, WU Ruilong, ZHOU Ming, WANG Chaoqun, ZHOU Hailiang   +4 more
openaire   +3 more sources

On Asymmetric Failure Characteristics of Tunnels and Surrounding Rock Control Techniques Under Close-Distance Repeated Coal Mining [PDF]

Advances in Civil Engineering
In response to the problem of significant deformation and obvious strata pressure in tunnel caused by close-distance repeated mining, along with difficult control of surrounding rocks, theoretical analysis, and numerical simulation methods were employed ...
Zhengduo Dai, Liyun Yang, Xiaowu Zhang
doaj   +2 more sources

Study on Pressure Relief Technology of High-Pressure Water Jet of Residual Coal Pillar in Overlying Goaf in Close Seam Mining [PDF]

Shock and Vibration, 2022
To solve the problem of strong ground pressure behaviour under a residual coal pillar in the overlying goaf of a close-distance coal seam, this paper proposes the technology of weakening and relieving the residual coal pillar in the overlying goaf by a ...
Shang Yang, Xuehui Li, Jun Wang, Shuhao Yang, Zhen Shen, Guangzheng Xu   +5 more
doaj   +2 more sources