Fracture Characteristics and Zoning Model of Overburden during Longwall Mining

Zheng-yi, TI; Li, Jiazhen; Wang, Meng; Li, Xiaoyan; Jin, Zhijun; Tai, Caiwang; Wang, Kang

doi:10.1155/2021/2857750

Cited by 4 publications

(4 citation statements)

References 35 publications

(36 reference statements)

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“…As shown in Figure 4, the middle plane of the PKS is drawn into difference grids and nodes, δ is the length of the grid spacing. The finite difference method uses difference equations to express the differential equations [36,37,48,49]. The basic difference equations of PKS in the goaf supported zone and rock mass supported zone are as follows:…”

Section: Finite Difference Methodsmentioning

confidence: 99%

“…Assuming that the PKS is a clamped plate [43], which is rectangular and bears a uniform load. Based on these assumptions, the following restrictions are imposed [36,37,44,45]:…”

Section: Construction Of Prediction Modelmentioning

confidence: 99%

“…The beam theory can only establish an overburden profile model. The elastic thin plate model with fixed support is inconsistent with the occurrence characteristics of the overburden [36,37].…”

Section: Introductionmentioning

confidence: 99%

“…With the increase in roof span, the immediate roof is separated first. It gradually interpenetrates and collapses, forming irregular blocks to fill the goaf [36,37]. With the increase in the mining excavation area, the fracture region of overburden expands upward.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Primary Key Stratum on Surface Subsidence during Longwall Mining

Wang

Jin

2022

Sustainability

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The surface subsidence caused by mining influences the mine environment and construction safety. In this paper, strata movement and surface subsidence were combined. Based on elasticity and Winkler theory, a prediction method of surface subsidence was established with the primary key stratum as the research object. Using the Tingnan Coal Mine as an example, the mining subsidence of the second panel was predicted. Comparing the predicted results with the measured results, the causes of errors were analyzed and the field of application of the model was clarified. Besides, the geological and mining factors affecting surface subsidence were also analyzed. The results show that the mining subsidence is the surface manifestation of the strata movement. Surface subsidence is affected by the mining area, load, and flexural rigidity of the primary key stratum, foundation modulus of the goaf, and the rock mass. The research results have significance for the planning of the coal resources and the prevention of geological disasters.

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Section: Finite Difference Methodsmentioning

confidence: 99%

“…Assuming that the PKS is a clamped plate [43], which is rectangular and bears a uniform load. Based on these assumptions, the following restrictions are imposed [36,37,44,45]:…”

Section: Construction Of Prediction Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of the Primary Key Stratum on Surface Subsidence during Longwall Mining

Wang

Jin

2022

Sustainability

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Numerical and Field Investigations of Rockburst Mechanisms Triggered by Thick-Hard Roof Fracturing

Zhang

et al. 2022

Rock Mech Rock Eng

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Numerical simulation study on the evolution characteristics of the stress induced by mining in deep adjacent working faces

Ma¹,

Zhang

Ma³

et al. 2023

Geoenviron Disasters

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Background The mining-induced stress in the surrounding rock after coal seam mining is the primary cause of damage and failure of the surrounding rock in the mining area. However, the magnitude and direction of the stress field induced by mining in the overburden strata during the excavation process of deep and adjacent coal seams are not yet clear, and it is difficult to determine how adjacent working faces interact with each other. Results In this study, a large-scale numerical model was built using FLAC3D (Fast Lagrange Analysis Continua) to simulate the sequential mining process of three adjacent working faces (No.1, No.2, and No.3) in Liuzhuang Coal Mine located in southern China. The results showed that the maximum height of plastic zone development after mining in the No.1 working face was 41 m, and the maximum height of plastic zone development was 33.8 m away from the 13 coal seam. It did not affect the top and bottom of the No.3 working face. The development height of the plastic zone on the roof of the No.2 working face after mining was 52m, and the top and bottom plates of the No.3 working face remained intact. The plastic zone of the floor of the No.3 working face after mining was not communicated with the plastic zone of the roof of the No.1 and No.2 working faces. There was a complete rock layer between the two coal seams, and there was not the mutual influence of the mining activities. During the mining process of working faces No.1 and No.2, the range of dynamic pressure influence was extended up to 100m ahead of the working face. During the mining process of the No.3 working face, the range of dynamic pressure influence was 120 m ahead of the working face. The No.1 working face goaf and the mining of No.2 working face had not disturbance to the No.3 working face. Conclusions After the mining of No.1 and No.2 working faces, the stress in the goaf significantly decreased, and the lateral support stress concentration area of No.1 and No.2 working faces had a relatively small impact on the 13 coal seam. Therefore, the No.1 goaf and mining of No.2 working faces had not disturbance to No.3 working face.

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Fracture Characteristics and Zoning Model of Overburden during Longwall Mining

Cited by 4 publications

References 35 publications

Influence of the Primary Key Stratum on Surface Subsidence during Longwall Mining

Influence of the Primary Key Stratum on Surface Subsidence during Longwall Mining

Numerical and Field Investigations of Rockburst Mechanisms Triggered by Thick-Hard Roof Fracturing

Numerical simulation study on the evolution characteristics of the stress induced by mining in deep adjacent working faces

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