Main geological and mining factors affecting ground cracks induced by underground coal mining in Shanxi Province, China

Lian, Xugang; Hu, Haifeng; Li, Tao; Hu, Dong-Sheng

doi:10.1007/s40789-020-00308-1

Cited by 47 publications

(34 citation statements)

References 26 publications

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“…e maximum subsidence is 2.5 m. e bending angle of the seam is calculated based on the subsidence geometry. It shows that the maximum bending angle is around 1.9°, according to studies related to deformational behaviour of coal mass [31,[35][36][37], and it suggests that the rock integrity of 1359P is favourable.…”

Section: Numerical Calculationmentioning

confidence: 74%

Analysis and Monitoring Technology of Upper Seam Mining in Multiunderlayer Goaf

Hang

Cao

2021

Advances in Civil Engineering

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Based on the background of close coal seam mining in the Qianjiaying coal mine, Tangshan, China, the feasibility of the upper seam mining in complex underlaying goaf is analysed using the roof caving analysis and numerical method. The deformation of the mining seam and roadways is monitored and analysed by field measurement and 3D laser scanning. The deformation characteristics of #5 seam after mining 1378P, 2071P, 2072P, and 2091P working panels with a depth of 39–54 m below the #5 seam are analysed using roof caving analysis and numerical method. Results show that the maximum deformation of #5 seam in the superimposed area of the lower goafs reaches 2.5 m and the maximum deformation in the single coal goaf is 1.5 m. The maximum seam inclination is 1.9°. The subsidence of the floor of 1359P roadways is obtained by field measurement, and the result is consistent with numerical calculation. ZEB-HORIZON 3D laser scanner was used to measure and model the roadway deformation. Based on the analysis of multiple scanning data, the deformation of the 1359P roadways was obtained. Results show that the deformation of the surrounding rock of the roadway is not great, the maximum displacement of the roof fall is 30 mm, and the maximum rib convergence is 25 mm. It can be concluded that the #5 seam can be recovered in this complex underlying lower seams’ mining condition.

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Section: Numerical Calculationmentioning

confidence: 74%

Analysis and Monitoring Technology of Upper Seam Mining in Multiunderlayer Goaf

Hang

Cao

2021

Advances in Civil Engineering

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“…The number and severity of mine disasters such as roof fall, floor heave, coal-gas outburst, and rockburst severely grow as the mining depth increases (Li et al 2017Lian et al 2020;Lu et al 2019;Wang et al 2019;Wu et al 2020;Xue et al 2020;Zuo et al 2019Zuo et al , 2020aZhao et al 2018). To reveal the mechanisms of such disasters, many investigations were conducted to test the mechanical behavior of individual rock samples (Dou et al 2020;Guo et al 2019;Yuan et al 2018;Zhao et al 2019;Wang et al 2020;Shen et al 2020) or coal samples (Kim et al 2020;Nikolenko et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of coal-rock bimaterial composite bodies under triaxial compression

Chen

Zuo

Liu

et al. 2021

Int J Coal Sci Technol

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To accurately predict coal burst hazards and estimate the failure of coal pillars in underground coal mining systems, it is of great significance to understand the mechanical behavior of coal-rock bimaterial composite structures. This paper presents experimental and numerical investigations on the response of rock-coal, coal-rock, and rock-coal-rock bimaterial composite structures under triaxial compression. The triaxial compression experiments are conducted under confining pressures in the range of 0–20 MPa. The resulting inside fracture networks are detected using X-ray-based computed tomography (CT). The experimentally observed data indicate that the mechanical parameters of the rock-coal-rock composites are superior to those of the rock-coal and coal-rock combinations. After compression failure, the coal-rock combination specimens are analyzed via X-ray CT. The results display that the failure of the coal-rock composite bodies primarily takes place within the coal. Further, the bursting proneness is reduced by increasing confining pressure. Subsequently, the corresponding numerical simulations of the experiments are carried out by using the particle flow code. The numerical results reveal that coal is vulnerable with regard to energy storage and accumulation.

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“…After mining of underground coal resources, the initial stress in rock mass is destroyed and redistributed, which leads to the large-scale subsidence of overburden and ground surface [1][2][3][4][5], and seriously affects the underground pipelines, structures, water system, ecological environment, and so on. Surface subsidence is only a representation, and overburden movement is the essence.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis of Mining Induced Overburden Subsidence Boundary with the Horizontal Coal Seam Mining

Yan

Chen

Tan

et al. 2021

Advances in Civil Engineering

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The overburden subsidence induced by underground mining has caused great damage to the ecological environmental and seriously threatens the safe use of underground structures. Focusing on the overburden subsidence, this paper uses theoretical analysis method to study the overburden subsidence boundary with a horizontal coal seam mining. In this paper, the viscoelastic theory and the random medium theory are used separately to deduce and analyze the subsidence boundary of bedrock and unconsolidated stratum, which are two media with different lithology. For bedrock, the results show that the subsidence boundary of bedrock is 1/4 of the wavelength of pressure wave from the mining boundary, strata subsidence boundary expands with the increase of vertical distance between calculated strata and coal seam, and the subsidence boundary in bedrock is an upward concave curve. For unconsolidated stratum, the results show that the larger the internal friction angle, the greater the angle between subsidence boundary and horizontal line. From the bottom to the surface of the unconsolidated stratum, the internal friction angle decreases gradually and the angle between subsidence boundary and horizontal line also decreases gradually, so the subsidence boundary curve in the unconsolidated stratum is convex. Combined with the bedrock and unconsolidated stratum, it is concluded that the subsidence boundary of the whole overburden is bowl-shaped. This study is helpful to reveal the black box of rock subsidence and can provide theoretical support for the establishment of overburden subsidence prediction model and transparent mine in the later stage.

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Main geological and mining factors affecting ground cracks induced by underground coal mining in Shanxi Province, China

Cited by 47 publications

References 26 publications

Analysis and Monitoring Technology of Upper Seam Mining in Multiunderlayer Goaf

Analysis and Monitoring Technology of Upper Seam Mining in Multiunderlayer Goaf

Experimental and numerical study of coal-rock bimaterial composite bodies under triaxial compression

Theoretical Analysis of Mining Induced Overburden Subsidence Boundary with the Horizontal Coal Seam Mining

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