Results 1 to 10 of about 1,100 (178)

Study on the Coal Pillar Weakening Technology in Close Distance Multi-Coal Seam Goaf

Energies, 2022
The pressure relief of coal pillars in close-distance multi-coal seam goaf is a complex engineering problem with the characteristics of “dynamic mine pressure”. Hence, this paper studies such problems.
Jie Zhang, Qingsong Zhuo, Sen Yang, Tao Yang, Bin Wang, Wenyong Bai, Jianjun Wu, Shaoliang Xie   +7 more
doaj   +4 more sources

Study on the failure law of overlying rock under coal seam in close distance coal seam and feasibility discrimination of upward mining [PDF]

Scientific Reports
Abstract Aiming at the key problems of failure evolution law and feasibility study of overlying strata in ascending mining of close distance coal seam group, this paper takes the recovery of 4 − 3 and 4 − 4 coal seams in Hongliulin Coal Mine as ...
Miao Y.
exaly   +4 more sources

Roof breaking characteristics and mining pressure APPEARANCE laws in close distance COAL seams

Energy Exploration & Exploitation, 2023
In order to obtain lower coal seam mining of roof breaking characteristic and the law of mine pressure appearance in the close distance coal seams, this paper takes working face 6101 of a mine as the engineering background, and studies the roof breaking ...
Xuping Li, Yanqing Liu, Xiaopeng Ren, Xiangye Wu, Chenhong Zhou   +4 more
doaj   +3 more sources

Research on the failure law and actual measurement of floor in extremely close distance thick coal seam mining [PDF]

Scientific Reports
The vigorous mining of domestic coal resources is accompanied by the complexity and diversification of the conditions of coal seams. Multi seam and close distance coal seam mining have become normalized.
Yupei Deng, Weidong Pan, Chao Ma, Shiqi Liu, Zhining Zhao, Cang Deng, Meng Li   +6 more
doaj   +5 more sources

Failure characteristics and stress field distribution law of roadway in downward mining of deep close distance coal seam [PDF]

Scientific Reports
Deep close distance coal seam mining is affected by the goaf of upper coal and remaining coal pillar, and the roadway of lower coal is difficult to maintain stability.
Mingxing Wei, Yongjian Zhu, Ping Wang, Yafei Luo, Heng Ren, Peng Li   +5 more
doaj   +3 more sources

Study on the Stability of Adjoining Rock of Lower Roadway in Close Distance Coal Seam Mining

Shock and Vibration
To address the issue of mutual disturbance between coal seams in close-proximity coal seam mining, this study examines the opposite excavation of the 10,205 working face and the 20,203 mining roadway in the Longhua Coal Mine.
Jie Zhang, Zixuan Jia, Tao Yang, Shoushi Gao, Jianjun Wu, Haohao Wu, Jiarui Sun, Pengkun Luo, Jiayue Deng   +8 more
doaj   +3 more sources

Fracture law of different overlying strata in mining of protective seam under close distance coal seam

Energy Science and Engineering, 2023
AbstractTo study the fracture law of different overlying strata during mining of the lower protective seam under a close distance coal seam at a depth of 1000 m, roof bed‐separation and fissure imaging monitoring were carried out in the inlet roadway ahead of the working face of the JI15‐31040 lower protective seam in the Pingdingshan XII coal mine ...
Honghu Yuan
exaly   +3 more sources

Study on the law of stress distribution in the presence of remaining coal pillar in a close-distance coal seam and the reasonable location of the roadway. [PDF]

Sci Rep
Abstract In order to reveal the impact of remaining coal pillar on roadway layout of the lower seam after the upper part of the close coal seam is reversely mined, theoretical analysis and numerical simulation are conducted in this paper. With the roadway to be excavated in a mine located in Shanxi as the research object, theoretical analysis ...
Wei XX, Zhao ZQ, Wang YW, Wang XH, Hui ZL.   +4 more
europepmc   +4 more sources

Optimizing roadway location and cross section under superposition of residual coal pillars and adjacent goafs in close distance coal seams [PDF]

Scientific Reports
The residual coal pillar and adjacent goafs in the upper coal seam have a superposition effect on the stress environment of the lower coal seam in close distance coal seams with downward mining.
Yuqi Ren, Jian Li, Yang Li, Xiaoyu Wu, Hongjie Qin   +4 more
doaj   +2 more sources

Support Control Design of Mining Roadway under Goaf of Close-Distance Coal Seam

Sustainability, 2023
Coal resources have always been the focus of attention in the field of sustainable development. Based on the problem of surrounding rock control in close-distance coal seams, first, a mechanical model of floor failure was established based on the 29204 working face in Dongqu Mine; the failure mechanism of the floor was revealed by the zero displacement
Lu, Guozhi, Ni, Ping
exaly   +2 more sources