Results 11 to 20 of about 1,016,619 (289)
Study of Reasonable Hanging Roof Length on Hard Roof [PDF]
Procedia Engineering, 2011 AbstractThe thesis, from the character of hard roof on longwall working face, moving character and control request, by establishing mechanical model and theoretic deduced method, achieves supporting strength of the breaker props and pressure interval control under the control of hard roof on longwall working face, and therefore realizes managing the ...
Kai, WANG
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A Method Based on Elastic Mechanics for Judging Compound Hard Roof and Its Application
Shock and Vibration, 2020 Compound hard roof overlying coal face is the common disaster factor leading to strong strata behaviors. To solve the long-standing problems of only considering partial factors and large deviation from the actuality when identifying compound hard roof, a
Haiyang Wang +6 more
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Support Roof Interaction Under Lower Hard Roof Conditions in Longwall Mining
MathematicsHard roofs in longwall mining may form large, suspended strata, which induce strong abutment stress redistribution. Therefore, a rational face support design is essential for ground control. This study develops an analytical numerical framework to evaluate support roof interaction under hard roof conditions.
Jie Zhang +6 more
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Bending Moment Characteristics of Hard Roof before First Breaking of Roof Beam Considering Coal Seam Hardening [PDF]
Shock and Vibration, 2018 The mechanical properties of a coal seam affect the distribution of support pressure. Considering the strain hardening effect of coal seam, the support pressure relationship of three zones—softened, hardened, and elastic—of a coal seam with regard to a hard roof is proposed, and methods to determine an approximate expression for the support pressure of
Shitan Gu +3 more
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Evolution of broken structure of hard thick roof and analysis of impact hazard area
Meikuang AnquanAiming at the influence of hard and thick roof fracture and structural evolution on the impact of working face, taking the hard and thick roof condition of 63 upper 05 working face in Dongtan Coal Mine as the engineering background, the critical ...
Pengfei LYU +4 more
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Investigation of the potential of calcareous grassland vegetation for green roof application in the UK [PDF]
, 2012 For the last few decades, the interest in green roofs has been developing quickly because of the benefits they have on the modern urban environment situation.
CHOI, Min-Sung
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Determination and Application of the Unsupported Roof Distance in Coal Roadway Driving With the Thick and Hard Main Roof [PDF]
, 2020 Abstract The authors have requested that this preprint be removed from Research Square.
Yang Sen +5 more
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Ground fracturing pre-control technology for potential mine seismic risk of thick and hard roof
Meitan kexue jishu, 2023 Mines with thick and hard roof face high risks of mine seismic activities and mine pressure during mining, which easily leads to dynamic disasters in mines.
Shuwen WANG +5 more
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Energy Science & Engineering, 2023 AbstractThe hard roof in coal mines will induce strong pressure problems for the working face and the lanes, which will seriously affect the safe and efficient production of the mine. For these issues, our team developed a new technology of cutting hard roof by composite blasting.
Bochao Ma +4 more
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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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