Field and simulation study of the rational coal pillar width in extra‐thick coal seams [PDF]
Energy Science & Engineering, 2020 The principles of mining pressure in extra‐thick coal seams are different from those of medium‐thick and thick coal seams. Field investigation, laboratory test, and simulation analysis methods were used to study the correlation between the gob‐side entry
Wenrui He, Fulian He, Yongqiang Zhao
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Failure properties of roadway with extra-thick coal seams and its control techniques [PDF]
HeliyonThe dense conventional combined support hardly controls the overall subsidence of the roadway roof in extra-thick coal seam and affects the excavation efficiency, leading to the technical problem of mining proportion imbalance in the mine. In this study,
Yiming Zhao, Nong Zhang, Jian Wang
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Height of the Fractured Zone in Coal Mining under Extra-Thick Coal Seam Geological Conditions
Advances in Civil Engineering, 2021 The height of the fractured zone caused by coal mining is extremely significant for safely mining under water, water conservation, and gas treatment. At present, the common prediction methods of overburden fractured zone height are only applicable to ...
Dequan Sun +4 more
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Research on prediction of residual deformation in goaf of steeply inclined extra–thick coal seam [PDF]
PLOS ONE, 2020 The residual deformation of a goaf is studied to improve the foundation stability assessment for metro lines passing through the subsidence area of steeply inclined extra-thick coal seams. The variable mining influence propagation angle is introduced to describe the special form of the rock movement.
Changfu Huang, Qun Li, Shuguang Tian
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Top coal drawing law for an extra thick coal seam under the single round group drawing method [PDF]
Scientific ReportsAbstractTo solve the problems of poor top coal drawing, lagging collapse, and difficulty in parallel operation of mining and drawing in extra-thick coal seams, considering the 8222 working face of the Tashan Mine as the engineering background, we first investigate the basic problems of fully mechanized top coal drawing mining in extra-thick coal seams ...
Weidong Pan +4 more
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Structural model of hard overburden shell in thick coal seam and its application [PDF]
Scientific ReportsTaking the mining of extra-thick coal seam of Carboniferous hard overburden in tongxin coal mine of datong mining area as the engineering background, the movement characteristics of hard overburden in fully-mechanized caving mining of 3–5 # extra-thick ...
Xing Fu +5 more
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Effect mechanism of strata breakage evolution on stope deformation in extra-thick coal seams
Alexandria Engineering Journal, 2022 The mining of extra-thick coal seams features severe deformation of the stoping roadway and section coal pillars due to the large mining thickness of the coal seams and the intense movement of the overlying strata.
Cunli Zhu +5 more
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Mining technology and practice of full-solid waste cemented backfilling in narrow strip of extra-thick coal seam under buildings [PDF]
Meitan kexue jishuThere is a great amount of coal pressed under buildings in our country, while the discharge of coal-based industrial solid wastes such as coal gangue and fly ash are increasing, which has severely restricted the local economic and social development ...
Lang LIU +6 more
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Study on crack propagation law of overlying strata in the process of small coal pillar mining in inclined extra-thick coal seam [PDF]
Scientific ReportsAiming at the problem of unclear crack propagation law of overburden rock in the process of small coal pillar mining in inclined extra-thick coal seam, this paper takes the 11,002 working face of Tengda Coal Mine in Heze, Xinjiang as the background ...
Weidong Lu +5 more
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Mechanism of reverse deformation increase in the virgin coal rib compared to the pillar rib of the gob-side entry in an extra-thick coal seam [PDF]
Scientific ReportsThe advantage of applying gob-side entries (GSEs) with narrow coal pillars in extra-thick coal seams to improve the recovery rate is particularly significant.
Wenrui He, Dongdong Chen, Hengzhong Zhu
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