Stress State of a Coal Pillar in Fully Mechanized Longwall Mining in Dislocation Zone

Seryakov, V. M.; Rib, S. V.; Fryanov, V. N.

doi:10.1134/s1062739117063065

Cited by 9 publications

(2 citation statements)

References 1 publication

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“…According to Section 4.1, the fracture line of the main roof in 11215 working face was located 30 m inside the chain pillar. erefore, we can control the fracture line on the chain pillar side by adjusting the width of the chain pillar [30][31][32].…”

Section: Advances In Civil Engineeringmentioning

confidence: 99%

Mechanism of Dynamic Failure in Roadways with Thick and Competent Roof Strata: A Case Study

Guo

Feng

et al. 2019

Advances in Civil Engineering

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Rock and coal dynamic failures have a higher chance to occur when thick and competent roof strata are presented, which can build up a high level of energy. This paper studied the fracturing characteristics of the competent roof strata during longwall face retreat and their effects on roadways’ stability to gain an improved understanding of the rock dynamic failure occurred in roadways as well as the associated ground controls. The results indicated that the main reason of dynamic failure in roadways was the structural change of lateral main roof over a chain pillar, which transformed from the cantilever beam in the period of primary mining impact (PMI) to the triangular arch in the period of secondary mining impact (SMI). Based on corresponding mechanical models developed for the lateral main roof over the chain pillar, it was calculated that the force on roadways’ roof in the period of SMI was 3.7 times larger than that in the period of PMI. Then, the dynamic failure control method of increasing the chain pillar width was proposed. The stress distribution and deformation of roadways with different chain pillar widths were simulated using FLAC3D. The results indicate that as the pillar width increases, the influence of secondary mining on roadways’ stability decreases, and a threshold of not less than 30 m pillar width was suggested. The outcomes of this study would provide guidance for the design of chain pillars where thick and competent roof strata are presented.

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Section: Advances In Civil Engineeringmentioning

confidence: 99%

Mechanism of Dynamic Failure in Roadways with Thick and Competent Roof Strata: A Case Study

Guo

Feng

et al. 2019

Advances in Civil Engineering

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“…Ming Z [17] studied the vertical stress distribution of surrounding rock and the deformation characteristics of coal pillar of gob-side entry under different coal pillar widths by numerical simulation; the design of the coal pillar width of gob-side entry was optimized based on the equilibrium theory of coal. V. M. Seryakov et al [18] conducted research on the mining abutment pressure of the longwall face of fully mechanized mining; they also explored the stress distribution change law of coal and surrounding rock in the roadway driving stage when the roadway is in stagger arrangement. Yuan Zhang [19] studied the distribution law of abutment pressure in deep stope, established a dynamic mechanical model of the roof structure, and finally proposed the optimum design method of coal pillar width of gob-side entry with prevention of large deformation of roof as the core.…”

Section: State Of the Artmentioning

confidence: 99%

Distribution Law of Principal Stress Difference of Deep Surrounding Rock of Gob-side Entry and Optimum Design of Coal Pillar Width

Qiang

Wang

et al. 2019

Teh. vjesn.

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The optimum design of deep-coal pillar width at the gob-side entry is the key to control surrounding rocks. Existing studies on this issue are based on the distribution law of mining abutment pressure without considering the principal stress difference distribution, which is related to the shear failure of surrounding rock. This study aimed to optimize the design of deep-coal pillar width at gob-side entry based on the distribution law of the principal stress difference. With FLAC 3D numerical simulation, the distribution characteristics of principal stress difference in the side mining stress field of the deep mining face and the distribution laws of the principal stress difference of the surrounding rock at the gob-side entry under different coal pillar width were explored. According to the distribution characteristics of the principal stress difference, the coal and rock mass on the goaf side in the deep mining face could be divided into three zones, i.e., decreasing, increasing and stable zones. Results show that the principal stress differences of the deep surrounding rock on the roof, floor, and coal wall rib at the gob-side entry present a single-peak curve distribution under different coal pillar width. However, the principal stress difference of the surrounding rock on the coal pillar rib displays a single-peak curve when the coal pillar width is less than or equal to 8 m, but a double-peak curve appears when the coal pillar width is greater than 8 m. The peak value of the shallow surrounding rock is obviously smaller than that of the deep surrounding rock. The width of the coal pillar of the gob-side entry in 11030-tunnel was optimized according to the theoretical calculation. This work provides a novel idea and method for the arrangement of deep coal pillars of gob-side entry.

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Abutment pressure distribution pattern and size optimization of coal pillar under repeated mining: a case study

Yang

2020

Arab J Geosci

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Stress State of a Coal Pillar in Fully Mechanized Longwall Mining in Dislocation Zone

Cited by 9 publications

References 1 publication

Mechanism of Dynamic Failure in Roadways with Thick and Competent Roof Strata: A Case Study

Mechanism of Dynamic Failure in Roadways with Thick and Competent Roof Strata: A Case Study

Distribution Law of Principal Stress Difference of Deep Surrounding Rock of Gob-side Entry and Optimum Design of Coal Pillar Width

Abutment pressure distribution pattern and size optimization of coal pillar under repeated mining: a case study

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