Assessment of ground instability risk of lower seam longwall panels during crossing overlying remnant pillars

Pan, Renming; Li, Yong; Wang, Hui; Xu, You‐Lin; Yang, Han

doi:10.1098/rsos.201249

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…Song [ 21 ], Zhang [ 22 ], and Cheng et al [ 23 ] studied the stress fracture distribution and evolution characteristics of surrounding rock under the influence of dual mining and discussed the relationship between the fractal dimension and mining stress. Pan [ 24 ] and Zhang et al [ 25 ] explored the development law of overburden fractures after mining double thick coal seams by using a combination of similarity simulation and numerical simulation and analyzed the fractures by using fractal dimension. Yang [ 26 ] established a coal seam permeability coefficient calculation model based on the fractal dimension of mining fractures, and revealed and determined the gas migration law and fracture development law in the coalbed methane-enriched area.…”

Section: Introductionmentioning

confidence: 99%

Fractal characteristics of overburden fissures in shallow thick coal seam mining in loess gully areas

Guo

et al. 2022

PLoS ONE

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The problems of water scarcity and ecological fragility are common in the loess gully area. To research the distribution and evolution of the overburden fissures and quantitatively analyze them have certain theoretical and engineering significance for realizing the evaluation of overburden damage degree and safe and green mining. This paper takes the 6102 working face of Chuancao Gedan Coal Mine as the engineering background. The development law and distribution characteristics of overburden fissures caused by the mining of shallow coal seams in the loess gully area were studied by the combination of physical similarity simulation, numerical similarity simulation and fractal theory. The results show that the fractal dimension change of the overburden fissures caused by the shallow mining of coal seam groups in the loess gully area can be divided into three stages during the mining process of the working face. Repeated mining causes the activation and development of overburden fissures, the fractal dimension increases significantly, and the regularity of changes weakens. The magnitude of the stress near the working face and the fluctuation times of the stress in the goaf have an influence on the change of the fractal dimension of the overburden fissures. According to the development angle and the fractal dimension of the overburden fissures, the overburden rock above the goaf is divided into the collapse fissure area, the compaction fissure area, and the vertical fissure area. Overburden fissures develop violently in the vertical fissure area, the overburden fissures in the compaction fissure area are mostly transverse fissures, and the overburden fissures in the caving fissure area are irregular.

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Section: Introductionmentioning

confidence: 99%

Fractal characteristics of overburden fissures in shallow thick coal seam mining in loess gully areas

Guo

et al. 2022

PLoS ONE

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“…Since then, remarkable achievements have been obtained. [4][5][6] Considering characteristics of the two-leg support, front tilting and back tilting are typical phenomena in coal mining. Considering the above property, researchers have tried to determine the relationship between the surrounding rock and the canopy.…”

Section: Introductionmentioning

confidence: 99%

Assessment of shield support performance based on an innovative mathematical-physical model in longwall faces

Xiang

Xie

Gao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the present study, theoretical and experimental investigations were conducted focusing on the load-carrying characteristics of the powered hydraulic support. Based on the drive space, a kinematic model using the Denavit–Hartenberg theory based on drive space was developed to predict the position information of the hydraulic support. Then the dynamic model of the support was established to analyze the carrying behaviors of the support. A computational procedure was presented to obtain a coupled solution of the kinematic mechanism and the failure mechanism. A test bench was designed to verify the model. The numerical model gained deep insight into the effects of the strokes of the column and the equilibrium jack, the working force of the column, the equilibrium, and the friction coefficients. As a result, the working intervals of the column and the equilibrium jack as well as the loading characteristics were investigated under various supporting attitudes. The obtained responses illustrate that the optimal structural parameters could be reasonably established to improve the performance of the powered support. Moreover, the performed analyses demonstrate that the proposed methodology can be applied to accurately predict the experimental response of the support and provide a basis to adaptively adjust the surrounding rock strata and the powered support in industrial applications.

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Multiphase assessment of post-mining effect on railway structures: A case study of Jharia Coalfield

Prakash,

Bharti,

Paul

2023

J Earth Syst Sci

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Assessment of ground instability risk of lower seam longwall panels during crossing overlying remnant pillars

Cited by 3 publications

References 21 publications

Fractal characteristics of overburden fissures in shallow thick coal seam mining in loess gully areas

Fractal characteristics of overburden fissures in shallow thick coal seam mining in loess gully areas

Assessment of shield support performance based on an innovative mathematical-physical model in longwall faces

Multiphase assessment of post-mining effect on railway structures: A case study of Jharia Coalfield

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