Results 41 to 50 of about 4,362 (258)

Experimental Study on Presplitting Blasting of Roof Cutting Along Goaf with Thick and Hard Roof Plate

IOP Conference Series: Earth and Environmental Science, 2021
Abstract In order to explore the reasonable blasting parameters of the gob-side entry retaining technology under the specific conditions of thick and hard roof, and realize successful roof cutting and safe roadway retaining, the thick and hard roof of the XV1306 working face in the first panel of Yixin Coal Mine is used as the research ...
Jianquan Tang, Hongliang Liu, Anfa Chen
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Study on disaster mechanism of thick and hard overhanging roof and top cutting control technology

Gong-kuang zidonghua
To address the challenges of significant deformation and high instability risks in the surrounding rock of unsupported roadways beneath a laterally thick and hard overhanging roof, this study focused on the 3810 working face transport roadway in ...
GENG Ming, SUN Jing
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Study on Dynamic Disaster Mechanisms of Thick Hard Roof Induced by Hydraulic Fracturing in Surface Vertical Well [PDF]

, 2022
With the increase in mining depth and the deterioration of mining conditions, thick and hard overburden movement frequently induces mine earthquakes and rock bursts.
Xiaoguang Shang, Li, Jiajie, Zhu, Chun, Sitao Zhu, Liu, Jinhai, Hitch, Michael, Zhu, Sitao, Liu, Hongliang, Jinhai Liu, Michael Hitch, Fuxing Jiang, Hongliang Liu, Jiajie Li, Shang, Xiaoguang, Jiang, Fuxing, Tang, Shibin, Shibin Tang, Chun Zhu   +17 more
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Analysis of overburden structure and evolution characteristics of hard roof mining in extremely thick coal seam

Meitan kexue jishu, 2023
The mining of extremely thick coal seam form a large space stope, the fracture disturbance of hard roof spreads to a wide range, the working face weighting has the characteristic of “strong mine pressure”, it is obviously different from rock burst ...
YU Bin, KUANG Tiejun, YANG Jingxuan, ZHU Weibing   +3 more
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Study on the Law of Surface Subsidence in Layered Mining of Thick Coal Seam with Medium Hard Roof

Scientific Reports, 2023
AbstractThe thick coal seam carried out by layered mining, the influence range of the overlying rock layer is relatively larger than that of the single-layer mining, and the surface deformation is more intense. At present, the research of thick coal seam mining is mainly concentrated within 15m, and there are relatively few studies on coal seams with a
Xiugang Liu, Fei Wei, Zhixiang Tan, Zaibing Jiang, Yi Wang, Jie Zhang   +5 more
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Mechanism and control of deformation in gob-side entry with thick and hard roof strata

Journal of the Southern African Institute of Mining and Metallurgy, 2023
Deformation of gob-side entries has always been a critical concern for ensuring stability in longwall coal mines. This paper addresses the significant deformation and support challenges that arise in thick and hard roof longwall faces (THRLF) due to dynamic pressure.
Guo, J.S., Ma, L.Q., Ngo, I.
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Development status and Prospect of directional hydraulic fracturing technology for coal mine roof [PDF]

E3S Web of Conferences, 2020
Aiming at the harm and control methods of thick and hard roof in coal mine, the paper firstly analyzes the advanced control methods of thick and hard roof, such as directional shaped charge blasting roof control technology, hydraulic fracturing roof ...
Liangwei LI
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The Breaking Span of Thick and Hard Roof Based on the Thick Plate Theory and Strain Energy Distribution Characteristics of Coal Seam and Its Application [PDF]

, 2017
In mining engineering, the thick and hard roof threatens the safe production. Based on Reissner plate theory and combined with weighted residual method, with four edges clamped as the boundary conditions, this paper deduces the theoretical formula of the
Xiaolong Li, Changwu Liu, Yang Liu, Hui Xie   +3 more
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Research on reasonable cutting roof parameters of gob side entry retaining by roof cutting in thick and hard roof

Meitan xuebao, 2023
In the engineering practice of gob side entry retaining by roof cutting, the height and angle of roof cutting are the direct influencing factors, and the reasonable roof cutting parameters allowed by the hard roof with a wide range of roof thickness change have their particularity.
Xuhui XU, Fulian HE, Kai LÜ, Deqiu WANG, Liang LI, Wenli ZHAI   +5 more
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Analysis of coal pillar rock burst appearance in multi-seam mining with thick and hard roof

, 2022
The existing research only analyzes the rock burst appearance characteristics under specific conditions, lacks research on the rock burst appearance induced by coal pillar under the condition of thick and hard roof. In order to solve this problem, taking
ZHOU Chao, ZHONG Taoping, LI Zhenlei, LI Hongping, LAN Shirui, SONG Dazhao, YANG Wei, ZHANG Chuanjiu   +7 more
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