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Advances in Civil EngineeringOne of the primary threats to coal mine safety production is the sudden extensive fracturing and collapse of thick and hard roof strata. A range of uniaxial compression experiments with acoustic emission (AE) monitoring was performed for studying the ...
Dongdong Qin, Zechao Chang, Ze Xia
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Analysis and Application on Controlling Thick Hard Roof Caving with Deep‐Hole Position Presplitting Blasting [PDF]
Advances in Civil Engineering, 2018 For the thick hard roof (THR) in Datong mining area, mining operations often led to large‐scale hanging‐roof and frequent and strong strata behavior, threatening mining safety seriously. Based on the instability mechanism, the fracture model for THR was established, including rock blocks articulation and combined cantilever beam, and the limit initial ...
Baobao Chen, Changyou Liu
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Characteristics of mine pressure and roof disaster prevention and control technology on hard and thick roof of working face [PDF]
Meitan kexue jishuMine pressure appears extremely strong during mining in hard and thick roof working faces. The prevention and control of this type of roof disaster has always been a problem that has plagued the safe and efficient production of working faces in my ...
Gang XU +8 more
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Thick-hard strata movement law and multi-dynamic load mechanism in longwall face with ultra-large cutting height [PDF]
Meitan xuebaoLarge mining height technology is characterized by high yield, high efficiency, and high recovery rate. It has become the preferred technology for mining thick coal seams in Yushen mining area.
Jiachen WANG +6 more
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Geofluids, 2023 Rockburst caused by the fracture of thick hard roof and the instantaneous instability of residual coal pillar seriously jeopardize the deep coal mining safety. This study takes Boertai Coal Mine, Shendong, China, as the engineering background, in which dynamic instability mechanisms of the gob-side roadway surrounding rock are analyzed by integrating ...
Wenjie Liu +4 more
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Frontiers in Earth ScienceRockburst prevention poses a major challenge in coal mining, with thick and hard roof strata being the primary cause of rockbursts. To analyze the feasibility and effectiveness of using hydraulic fracturing as an alternative to blasting methods for ...
Kunlun Liu +8 more
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Applied SciencesBecause of its strong bearing capacity and large size, a thick and hard roof is the main source of strong ground pressure in a stope, and its breaking and migration mechanism and effective control are very important for realizing safe and efficient ...
Xingping Lai +4 more
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Geofluids, 2021 Based on the occurrence conditions of a thick and hard main roof and wedge-structure immediate roof in the Zhuxianzhuang Coal Mine, the fracture characteristics and instability migration law of a thick and hard roof (THR) were examined via physical ...
Tong Zhao +5 more
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Applied SciencesTo address the issue of rockburst in deep return airways caused by thick, hard sandstone roofs in the Hulusu Coal Mine, this study proposes a deep borehole pressure relief technique based on hydraulic fracturing. The goal is to proactively weaken the hard roof structure and effectively mitigate rockburst hazards.
Zhensuo Wang +4 more
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Research on the Reasonable Width of Coal Pillar Driving along Goaf under Thick Hard Roof
Applied SciencesThere are fewer studies on the width of coal pillar retaining under a thick, hard roof. This paper takes the thick limestone roof in the 10110 working face of Jinniu Coal Mine as the background, taking the reasonable coal pillar width and its stability control technology as research objectives. Taking the theoretical analysis and calculation, numerical
Wei Gu +3 more
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