Laws and mechanisms of slope movement due to shallowly buried coal seam mining under ground gully

Fan, Gangwei; Zhang, Dongsheng; De-yuan, Zhai; Wang, Xufeng; Lü, Xin

doi:10.1007/s12404-009-0402-4

Cited by 8 publications

(4 citation statements)

References 1 publication

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“…This could lead to a series of mine safety and environmental issues, including cracks on the surface, water loss, vegetation deterioration, land desertification, and water inrush [1][2][3][4]. Therefore, an accurate and effective understanding of the spatiotemporal evolution law of mining-induced fractures in overlying strata is critical.…”

Section: Introductionmentioning

confidence: 99%

Visual Exploration of the Spatiotemporal Evolution Law of Overburden Failure and Mining-Induced Fractures: A Case Study of the Wangjialing Coal Mine in China

et al. 2017

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Abstract:The borehole television approach is an effective way of detecting mining-induced fractures in overburden strata as it can visualize fractures to facilitate a quantitative analysis of size, quantity, length, and other features. In this article, the borehole television approach is applied on panel 20105 of the Wangjialing Coal Mine in China to investigate the overburden movement and spatiotemporal evolution law of mining-induced fractures from the coal seam to ground surface. The results revealed that the overburden strata experienced the phases of roof caving, generation of fracture, bed separation, dislocations, fracture propagation, surface subsidence, and closing of fractures. The process can be divided into the initiation stage, the active stage, and the degradation stage along the mining direction. For exploited working faces, the caved zone height is 2.9-4.11 times the mining height, and the height of the fractured zone is 19. 35-22.19 times the mining height. The height range of the three parts in the fractured zone is 24-26, 40-45, and 30-35 m. Significant fractures were observed in the bending zone.Step subsidence and cracks, which indicate severe damages, were observed on the ground surface above the goaf.

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Section: Introductionmentioning

confidence: 99%

Visual Exploration of the Spatiotemporal Evolution Law of Overburden Failure and Mining-Induced Fractures: A Case Study of the Wangjialing Coal Mine in China

et al. 2017

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“…Whether the gangue layer is close to the roof or floor, it will seriously affect the mining of coal seams, increase the ash content of coal, and reduce the quality of coal 3,4 . At the same time, the presence of gangue also increases the deformation of the drum during the cutting process, affecting the coal falling performance of the drum 5,6,7 . At present, mining of thin coal seams containing gangue has become one of the hot topics studied by scholars at home and abroad, and many scholars have conducted systematic research on this.…”

Section: Introductionmentioning

confidence: 99%

Coal falling trajectory and strength analysis of drum of shearer based on bidiectional coupling method

Zhang,

Zhao,

Shi

2024

Preprint

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The cutting and crushing of coal and rock containing gangue is the result of the coupling effect of multiple factors. The geometric parameters of the working mechanism, the Kinematics parameters of the shearer, and the physical and mechanical properties of the coal and rock to be cut will all affect the cutting and crushing process of the shearer. In order to study the coal falling trajectory of spiral drum cutting coal and rock, obtain its optimal cutting parameters, and achieve efficient cutting of spiral drum, a coal falling trajectory and strength analysis of drum of shearer based on bidirectional coupling technology was proposed based on particle discrete element contact theory and virtual prototype technology. The DEM-MFBD (Discrete Element Method Multi Flexible Body Dynamics) two-way coupling technology was used to realize the cutting and interactive information of the spiral drum on the complex coal seam with gangue. Construct the cutting conditions of the spiral drum under different cutting depths, rotational speeds, and traction speeds. Monitoring the movement status of coal and rock particles under different working conditions. Compile the coal falling trajectory equations of coal and rock particles under different working conditions and draw the coal falling trajectory curve. The optimal coal loading rate was used as the measurement standard for the coal falling trajectory, and the optimal coal falling trajectory of the drum was obtained through full factor experiments. Extract the load of the drum and pick, analyze their stress and deformation, and perform fatigue life analysis on the pick with the highest stress. The results indicate that the maximum deformation occurs on the cutting teeth that are cutting hard gangue. The stress of the tooth seat is mainly concentrated at the root of the tooth seat, and its maximum equivalent stress is less than the yield limit value of the selected material. Therefore, the material selection and structural design of the drum are safe and reliable. By building a coal mining machine cutting coal and rock experimental platform, monitoring the working status of the designed spiral drum, it meets the usage requirements. Based on industrial experiments conducted underground, the measured average coal loading rate of the shearer drum was 46.31%, achieving stable operation and verifying that the designed drum of shearer has efficient cutting ability.

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“…In Dongsheng coalfield, sudden spalling of barrier pillars and crushing of face hydraulic supports without warning frequently occurred in underground stopes (see Figure 1). These events cannot be explained according to traditional theories on coal mine ground pressure [4][5][6]. In general, coal and/or rock bump usually occurs in deep coal mining due to the super-high ground pressure [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Roof Shock in Longwall Coal Mining under Surface Gully

Fan

Zhang

Wang

2015

Shock and Vibration

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The paper presents an interpretation on the abnormal roof shock in longwall coal mining under gullies using physical modeling, numerical modeling, and mechanical analysis. The modeling results show that the roof movement causes the shock load onto the stope in longwall coal mining under surface gully. The triggering mechanism of shock load depends on the direction of the face retreat with respect to the bottom of the surface gully. The slope tends to slide along the interface plane with a long periodical weighting intervals when mining towards the bottom of the gully (downslope direction), while the overburden strata may be split into blocks and tend to topple towards the free face of gully when mining away from the bottom of the gully (upslope direction). The mechanical models showed that, during the period of mining in downslope direction, planar sliding and key fragmental blocks cause a sudden roof shearing off which could result in shock load and, during the period of mining in upslope direction, the overburden blocks may become unstable due to shearing off which could resulted in large shock pressure onto the stope.

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Laws and mechanisms of slope movement due to shallowly buried coal seam mining under ground gully

Cited by 8 publications

References 1 publication

Visual Exploration of the Spatiotemporal Evolution Law of Overburden Failure and Mining-Induced Fractures: A Case Study of the Wangjialing Coal Mine in China

Visual Exploration of the Spatiotemporal Evolution Law of Overburden Failure and Mining-Induced Fractures: A Case Study of the Wangjialing Coal Mine in China

Coal falling trajectory and strength analysis of drum of shearer based on bidiectional coupling method

Mechanism of Roof Shock in Longwall Coal Mining under Surface Gully

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