A field investigation for overlying strata behaviour study during protective seam longwall overmining

Xiong, Zuqiang; Wang, Cheng; Zhang, Nianchao; Guang-mei, Tao

doi:10.1007/s12517-015-1827-2

Cited by 20 publications

(11 citation statements)

References 8 publications

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“…Tan et al used a borehole camera technology to explore the zonal disintegration developing process in roof strata influenced by multiple mining activities [17][18][19]. Xiong et al used the three-borehole method (multi-point displacement measuring, the double end seal with water injection method and borehole television photographing) for the overburden failure law in an upper protected coal seam while the lower protective seam is mined [20]. Zhang et al studied the distribution and propagation of various mining-induced fractures and found that transverse and longitudinal fractures intersect with each other, while a high degree longitudinal fractures dominate and become crushing fractures as they approach the roof [21].…”

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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“…For example, Cheng et al investigated the overburden movement induced by coal mining using microseismic monitoring and developed a method for zoning overburden in a vertical direction [15]. Xiong and Wang et al studied mininginduced fractures in overburden through field investigation combined with borehole imaging, which allows for the visualization of the fracture development process [16,17]. Some scholars have used endoscopic observations of fractures to describe the quality of rocks, and studied the rock mass stratification [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Influence of Spatial Relationships between Key Strata on the Height of Mining-Induced Fracture Zone: A Case Study of Thick Coal Seam Mining

Wang

Cao

et al. 2018

Energies

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Abstract:The behavior of the overburden of working face 20104 at the Wangjialing coal mine was investigated using borehole imaging. The measured height of the conductive fracture zone (CFZ) in the overburden, 148 m, is significantly different from the height that is predicted by an empirical formula. The spatial relationships between key strata (KS) required for their fracturing and their influence on the CFZ's height were analyzed. The results demonstrate that the spatial relationships between adjacent KS are a major factor behind the abnormal increase in the height of CFZ relative to the coal seam. The height of linkage (HoL) between KS was introduced and an equation for calculating this height was proposed. The study found that the fracturing of a KS could induce fracturing of the adjacent KS above it if their height difference was smaller than the HoL between them. Otherwise, the fractures resulting from the lower KS would terminate at the bottom of the higher KS. When the location of a high KS satisfies certain requirement, the spatial linkage between adjacent KS will allow for the conductive fractures arising in a lower KS to propagate through the high KS as well as the strata controlled by it, thus increasing the height of CFZ in overburden.

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“…Liu and Cheng [17] discussed long distance lower protective seam mining. Xiong et al [18] discussed a field investigation of protective seam longwall overmining. Jiang et al [19] discussed the technology of mining protective coal seam.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method for Selecting Protective Seam against Coal and Gas Outburst: A Case Study of Wangjiazhai Coal Mine in China

Dong

Zou

2017

Sustainability

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Abstract:Protective seam mining is a major and critical regional measure to prevent coal and gas outbursts (CGO) in coal mines. In this study, a novel method for selecting protective seam against coal and gas outburst was studied on the basis of gas geology and rock strata control theories and principles for protective seam mining and relevant regulations, which is that theories of gas geology were used to assess the outburst risk inherent in different seams of this mine, and then make preliminary selection of protective seams, and the technical feasibility of the proposed selection method was then analyzed using the theories and principles for protective seam mining and relevant regulations. The case application study results show that the extraction of the upper protective seam (UPS) caused significant decreases in the predicative indicators of outburst risk in the outburst-prone seam and thereby prevented CGO, and the novel method can provide a theoretical basis for selecting protective seam against CGO.

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A field investigation for overlying strata behaviour study during protective seam longwall overmining

Cited by 20 publications

References 8 publications

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

Influence of Spatial Relationships between Key Strata on the Height of Mining-Induced Fracture Zone: A Case Study of Thick Coal Seam Mining

A Novel Method for Selecting Protective Seam against Coal and Gas Outburst: A Case Study of Wangjiazhai Coal Mine in China

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