Trait of subsidence under high rate of coal extraction by longwall mining: some inferences

Prakash, Amar; Kumar, Ajay; Verma, Aniket; Mandal, Sujit; Singh, Pradeep K.

doi:10.1007/s12046-021-01747-5

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…From the calculation formula for the sliding instability of the hinged rock beam structure, along with Equations ( 3), (7), and ( 11), the discriminant for sliding instability of the sub-key strata bearing structure after activation can be derived as…”

Section: Stability Assessment Of Activated Bearing Structuresmentioning

confidence: 99%

“…However, with the extensive exploitation of coal resources, the initial mining seams have been nearly exhausted, prompting a transition to the mining of lower coal seams. This shift has revealed escalating high-intensity mining pressure, causing pronounced ground subsidence and posing significant challenges to the safety and efficiency of mine recovery [5][6][7]. The severe impact on mine safety and irreversible damage to the surface necessitate urgent research to elucidate the coupled evolution mechanism of strong mining pressure and surface subsidence.…”

Section: Introductionmentioning

confidence: 99%

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Study on Activation and Restructuring of Key Strata in Shallowly Buried Coal Seam Bearing Structure and Load Characteristics

He,

Zhang,

Liu

et al. 2024

Processes

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The mining of shallow coal seam groups triggers the activation of overlying strata, leading to increased pressure and support difficulties, thereby posing a threat to the safe extraction of underlying coal seams. Against the backdrop of Longhua Coal Mine, this study utilized physical similarity simulation experiments to obtain the activated, restructured load-bearing structure and the migration characteristics of overlying strata. Theoretical calculations were employed to establish both a rolling friction mechanics model for the activated load-bearing structure and a mechanical model for the combined load-bearing structure of key strata. The research indicates that during the initial activation phase, the load-bearing structure exhibits a V-shaped hinged arch, with directly collapsed rock masses transitioning towards spherical shapes, resulting in the sub-key strata shifting from sliding friction to rolling friction. Based on the rolling friction mechanics model of the activated load-bearing structure, we derived the rolling friction coefficient of key blocks in the sub-key strata and the instability criterion of the load-bearing structure under rolling friction conditions. Considering the migration characteristics of the activated restructured load-bearing structure, four types of combined load-bearing structures were identified, and the load calculation formulas in the mechanical model were derived, with the rationality of these formulas verified through case analysis.

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Section: Stability Assessment Of Activated Bearing Structuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on Activation and Restructuring of Key Strata in Shallowly Buried Coal Seam Bearing Structure and Load Characteristics

He,

Zhang,

Liu

et al. 2024

Processes

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show abstract

“…Meanwhile, the coal deposits under these buildings, railways and water bodies are concentrated in the relatively economically developed eastern and southern provinces of China, such as Jiangsu, Shandong, Anhui, Henan and Hebei provinces, where mining complexity is increasingly the result of the continuous scale increase in villages, which tend to be densely populated and have a complex population distribution; a similar situation exists in other coal mining countries [4,5]. At the same time, coal mining around the world inevitably causes surface subsidence, resulting in damage to surface infrastructure, making it important to ensure the safety of surface infrastructure while recovering deposited coal resources [6][7][8][9]; in addition, coal mining causes environmental damage such as the decline of groundwater, and it is worth paying attention to how coal mining can be carried out under a policy that meets environmental protection requirements [10][11][12]. Therefore, ensuring the green mining of coal resources and the sustainable development of surface infrastructure are the biggest challenges faced by the mining areas of deposited coal resources under buildings [13].…”

Section: Introductionmentioning

confidence: 99%

Study on Rock and Surface Subsidence Laws of Super-High Water Material Backfilling and Mining Technology: A Case Study in Hengjian Coal Mine

Yan

Dai

et al. 2023

Sustainability

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Research on the rock and surface subsidence laws of super-high water material backfilling and mining technology can provide a scientific basis for liberating coal resources that are deposited under buildings, railways, and bodies of water. Using field measurements, numerical simulations, and theoretical analyses to study the geological mining conditions of the Hengjian Mine in Handan, Hebei Province, this research comprehensively analyzes the dynamic and static deformation laws of rock and surface subsidence, reveals the subsidence control mechanism, complements existing studies and helps improve the feasibility of new technology in engineering practices. This study shows that rock and surface subsidence values are smaller when the super-high water material backfilling and mining technology are used, and the surface movement parameters are smaller than those of the fully caving mining method. The backfilling material supports the rock load above the mining area and suppresses the rock and surface subsidence. In addition, the super-high water backfilling material limits the height of the developing stress arch above the mining area, thus reducing the range of deformation in the rock and surface movement. In engineering practice, the development of the stress arch can be controlled by increasing the backfilling rate and the strength of the backfilling material. With the above-mentioned discoveries, this research is of great significance to the promotion and application of super-high water material backfilling and mining technology and the liberation of deposited coal resources.

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Surface deformation abnormal characteristics of ultra-thick and weakly consolidated overburden and its disaster control method

Li,

Sun,

Huang

et al. 2024

Environ Earth Sci

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Trait of subsidence under high rate of coal extraction by longwall mining: some inferences

Cited by 4 publications

References 11 publications

Study on Activation and Restructuring of Key Strata in Shallowly Buried Coal Seam Bearing Structure and Load Characteristics

Study on Activation and Restructuring of Key Strata in Shallowly Buried Coal Seam Bearing Structure and Load Characteristics

Study on Rock and Surface Subsidence Laws of Super-High Water Material Backfilling and Mining Technology: A Case Study in Hengjian Coal Mine

Surface deformation abnormal characteristics of ultra-thick and weakly consolidated overburden and its disaster control method

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