Coupling control on pillar stress concentration and surface cracks in shallow multi-seam mining

Huang, Qiongxiang; Du, Junwu; Chen, Jie; He, Yanpeng

doi:10.1016/j.ijmst.2020.12.019

Cited by 47 publications

(31 citation statements)

References 3 publications

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“…Through physical simulation and numerical calculation, he revealed the breaking law of the interval rock, the distribution law of the concentrated stress of the coal pillar, the overburden, and the surface in the coal seam mining in different coal pillar sections. The law of crack development and the law of surface subsidence have mastered the relationship between the staggered distance of different sections of coal pillar, the stress concentration of coal pillars and the crack evolution of overburden rock [4,5]. Professor Suo Yonglu used computer numerical simulation and theoretical analysis to conclude that the reasonable layout of coal seam mining roadways in Chenghe Bailiang Xusheng Coal Mine should adopt an internal error of 4 -8 m [6].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Instability Mechanism of Section Coal Pillar in Shallow Buried Coal Seams

et al. 2022

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There is abundant coal resource of Jurassic period in Yulin City, and the problem of shallow buried coal seams mining will occur in every mine area. FLAC3D is used to analyze the plastic failure, deformation characteristic, and vertical stress on shallow buried coal seams mining, based on north No. 2 engineering geological conditions of Hongliulin Mining Corporation. In this paper, the results are shown as follows. The plastic failure fields of section coal pillar forming are smaller; the coal seam hosting is shallower. The elastic region of section coal pillar has a relatively large proportion, which is the coal seam first mined. The value of Z-Displacement for the first coal seam is relatively small. However, for the lower coal seam it is relatively big. The value of X-Displacement for each coal seam is relatively small. The coal wall of section coal pillar is in a steady state. The coal seam hosting is deeper; the more distant is from coal wall to peak point abutment pressure. The stress concentration factor for the first coal seam is relatively big. The research conclusion reveals instability mechanism of section coal pillar, while coal seams mining, which provides a theoretical basis for designing width vale and optimizing supporting scheme of section coal pillar, has engineering experience application value to other coalmines in Yulin City.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Instability Mechanism of Section Coal Pillar in Shallow Buried Coal Seams

et al. 2022

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“…In China, the coal in the eastern region has been nearly mined out, and the coal mining has been transferred to the western region, which is rich in coal reserves and has become a new energy base [1][2][3][4]. Compared with the eastern region, the coal seams in the western region are mostly shallow coal seams beneath gully terrain [5,6].…”

Section: Introductionmentioning

confidence: 99%

Study on Influence Laws of Strata Behaviors for Shallow Coal Seam Mining beneath Gully Terrain

Wang¹,

Li²,

Wu³

et al. 2021

Shock and Vibration

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The study on influence laws of strata behaviors is the basic guarantee of safety mining for shallow coal seam beneath gully terrain. Taking 3302 mining face of Zhujiamao Coal Mine as the engineering background, the laws of strata behaviors for shallow coal seam mining beneath gully terrain are studied by field detection, theoretical analysis, and numerical simulation. The strata pressure observation and the hydraulic support working resistance show that the dynamic strata behaviors appear violently during mining beneath the gully bottom. The theoretical analysis shows that the rotation and breaking of key stratum beneath gully bottom under nonuniform load is the fundamental cause of strong dynamic strata behaviors. The numerical simulation of overburden movement and fissure development characteristics shows that the strata behaviors beneath the gully bottom are stronger than the strata behaviors beneath other areas. Additionally, according to the laws of dynamic strata behaviors, the safety measures for mining beneath gully bottom are put forward.

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“…Many researchers in China have studied the mechanisms of pressure frames and the control measures of the overlying concentrated coal pillars in fully mechanized coal mining faces of shallow coal seams. Based on the study of coal pillars in multiseam mining in a Shigetai coal mine and the classification of coal seam groups [12,13]. e researchers found that when a comprehensive mining face is close to the overlying coal pillar, the change in the large structure will cause the range of the lower small structure rock layers to increase exponentially, where the stress states of the small structure rock stratum change from tension to shear, and the load-bearing of the microstructures increases greatly, while the microstructure integrity is destroyed.…”

Section: Introductionmentioning

confidence: 99%

Study on the Mine Pressure Law and the Pressure Frame Mechanism of an Overlying Goaf in a Shallow Coal Seam

Huang

Liu

2021

Shock and Vibration

Self Cite

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To study the problems of dynamic load pressure and frame pressure caused by the concentration of stress by coal extraction pillars during the mechanized short-distance mining of goaves in shallow coal seams, a frame pressure accident, in the Shendong Shigetai Coal Mine, during the overlying of a fully mechanized mining goaf is taken as a research example. By applying the field measurement, theoretical analysis, and numerical simulation methods, we throughly analysed the working face coal pillar, got the regular pattern of fully mechanized overburden pressure, summarized a pillar of fully mechanized working face in the overburden strata movement regularity and development characteristics, analyzed the reason and mechanism of broken coal pillar, and put forward the corresponding prevention measures and management method. The results show that when the fully mechanized mining face enters the goaf by about 3 m, the pressure arches of the lower coal face and the upper goaf arising from the extracted coal overlap. When the vertical stress is greater than the supporting force of the hydraulic support and the coal wall, a roof ejection accident may occur.

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Coupling control on pillar stress concentration and surface cracks in shallow multi-seam mining

Cited by 47 publications

References 3 publications

Numerical Simulation on Instability Mechanism of Section Coal Pillar in Shallow Buried Coal Seams

Numerical Simulation on Instability Mechanism of Section Coal Pillar in Shallow Buried Coal Seams

Study on Influence Laws of Strata Behaviors for Shallow Coal Seam Mining beneath Gully Terrain

Study on the Mine Pressure Law and the Pressure Frame Mechanism of an Overlying Goaf in a Shallow Coal Seam

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