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Timely roof breaking and pressure relief technology by hard roof staged fracturing [PDF]
AIP AdvancesHard roofs in longwall mining often generate large roof caving steps during initial weighting and form extended hanging roofs during periodic weighting. These phenomena can lead to sudden cave-ins, rock bursts, and mine seismicity.
Kaige Zheng
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Study on Rock Burst Event Disaster and Prevention Mechanisms of Hard Roof
Advances in Civil Engineering, 2019 Coal mining under hard roofs is jeopardized by rock burst-induced hazards. In this paper, mechanisms of hard roof rock burst events and key techniques for their prevention are analyzed from the standpoint of energy evolution within geological conditions ...
Nan Zhou +3 more
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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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Study of Reasonable Hanging Roof Length on Hard Roof
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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Frontiers in Earth Science, 2022 Aiming at the mining disaster of a thick hard roof, based on the analysis of the mining instability influence of the thick hard roof, this study constructs the mining bearing mechanical model of the thick hard roof by using mechanical theory and obtains ...
Qingwei Bu +5 more
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Energy Exploration & Exploitation, 2022 A thick-hard roof implies a large hanging-roof and high-frequency dynamic strata behaviour during mining, which may jeopardise personnel safety and equipment.
Baobao Chen, Changyou Liu, Bing Wang
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Study on the dynamic response and roadways stability during mining under the disturbance of hard roof break [PDF]
Scientific ReportsUnder the condition that the working face was directly covered with hard roof, the abrupt breaking of hard roof release significant amount of energy, thus prone to triggering dynamic disasters such as roadway instability or rockburst. This paper based on
Kong Peng +4 more
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Processes, 2023 The key parameters of pressure relief pre-splitting blasting technology (PRPBT) contribute to the implementation effect of goaf-side entry by roof cutting (GSERC).
Hengzhong Zhu
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Shock and Vibration, 2021 In order to study the fracture patterns of hard main roof in longwall top coal caving (LTCC) with large mining height, a two-dimensional physical similarity model was created to simulate the mining process of No.
Jinkai Liu +3 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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