Results 31 to 40 of about 152 (101)
Typical characteristics of deep coal seams with high outburst risk, outburst inducing mechanism and prevention measures [PDF]
Meitan xuebaoCoal mining in China has gradually entered deep levels. With the continuous increase in mining depth, the outburst risk of coal seam has significantly increased, with both the frequency and intensity of outbursts rising noticeably, posing huge challenges
Baiquan LIN, Wei YANG, Tong LIU
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Theoretical study on the mechanism of stick-slip instability occurrence on deep coal-rock structure [PDF]
Frontiers in Earth ScienceDynamic disasters seriously threaten the safety and effectiveness in deep mining. The mechanism of stick-slip instability occurrence on the deep coal-rock structure was studied in this paper through analyzing the occurrence condition of stick-slip in the
Zhenpei Zhang +8 more
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IOP Conference Series: Earth and Environmental Science, 2021 Weiguo Liang, Yanxia Wu
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Dust Control Technology in Dry Directional Drilling in Soft and Broken Coal Seams
Energies, 2022 High rate of dust generation and serious dust diffusion in dry directional drilling in soft and broken coal seams (SBCS) have long been critical problems in the mining process. To solve these problems, in this study, a dust hood was designed and applied to realize non-contact dust control in drilling holes.
Dongmei Wu, Jie Gao, Ke Lu
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IOP Conference Series: Earth and Environmental Science, 2023 Abstract Horizontal well multistage fracturing in the roof of broken soft coal seams has been demonstrated to be an effective technique to extract coalbed methane (CBM). However, fracture propagation behaviours under this technology vary significantly with different roof lithologies. Therefore, the influence of roof lithology on fracture
X J Li +5 more
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Energy Reports, 2020 There are many problems within drilling in soft and broken coal seams, such as borehole collapse, borehole air leakage, CO Toxic gas generated during borehole construction, coal dust pollution to the working environment and other hazards.
Hong Li +4 more
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Significance of Rock Mineral Composition On Rock Mechanical Properties And Brittleness Evaluation of Roof And Floor of Broken Soft Coal Seam [PDF]
, 2021 Abstract Fracture of coal structure and low permeability were the main reasons for the “difficult to released gas” in broken soft coal seam. Exploration of horizontal well coalbed gas technology of roof and floor of broken soft coal seam provided a new technical way for coalbed gas development in broken soft coal seam.
Guangqing Hu +5 more
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Process simulation and application of hydraulic cavitation while drilling technology
Meikuang Anquan, 2022 In improving the efficiency of gas extraction from soft and low permeability coal seams, the traditional hydraulic punching method requires drilling, lifting the auger, lowering the hole-making device, lifting the auger and then lowering the screen pipe
DUAN Heming +4 more
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Meitan kexue jishu, 2023 Aiming at the problems of controlling the large deformation and failure of surrounding rock of deep soft-broken coal roadway, the gob-side entry driving with narrow coal pillar in the working face mined on both sides of the deep soft-broken coal seam in ...
En WANG +4 more
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Influence of support stiffness on face stability in longwall face with large cutting height
Meitan kexue jishu, 2023 Longwall mining with large cutting height serves as one of main methods for extracting thick coal seam. Face failure gradually becomes a critical phenomenon due to significant increase of the cutting height, which drastically influences the mining ...
HAN Yufeng, WANG Zhaohui, TANG Yuesong
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