Characteristics of Overburden and Ground Failure in Mining of Shallow Buried Thick Coal Seams under Thick Aeolian Sand

Liu, Guangchun; Zou, Youfeng; Zhang, Wenzhi; Chen, Junjie

doi:10.3390/su14074028

Cited by 3 publications

(3 citation statements)

References 41 publications

(49 reference statements)

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“…To better understand the mining characteristics during mining of shallow buried thick coal seams (SBTCS) under thick aeolian sand (TAS), Liu et al [32] explored the ground damage characteristics and fracture development during mining under special geological conditions of TAS through theoretical derivation, numerical simulation, and field monitoring. The results revealed the essence of the development and the distribution of surface cracks caused by mining SBTCS, and depth-to-thickness ratio (DTR) was shown to be 13.…”

Section: Guarantee For Mining Production Safetymentioning

confidence: 99%

Mining Safety and Sustainability—An Overview

2022

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Section: Guarantee For Mining Production Safetymentioning

confidence: 99%

Mining Safety and Sustainability—An Overview

2022

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“…A similar-material simulation has a short testing period, and the simulation of mining subsidence can be artificially controlled so that complete rock movement and deformation laws can be observed (Wang et al, 2016;Xu et al, 2017b;Zhu et al, 2018;Qin et al, 2021). At the same time, a numerical simulation can help study the surface movement law of the whole basin more comprehensively and accurately, and the influence of complex geological condition factors can be taken into account (Cao et al, 2018;Kong et al, 2019;Liu et al, 2022;Cao et al, 2023). Therefore, the use of a similar-material simulation in conjunction with a numerical simulation can allow for an indepth study of the rock movement characteristics of the extraction zone, and help obtain the dynamic development law that cannot be obtained through theory and practice.…”

Section: Introductionmentioning

confidence: 99%

Simulation study on surface deformation of shallow buried coal seam mining in a gully area

Wang,

Cai,

Zhang

et al. 2023

Front. Earth Sci.

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Coal mining subsidence leads to frequent surface ecological and environmental problems. Due to the unique topographic conditions within gully areas, the deformation and damage characteristics, along with the evolution laws of the surface, have been difficult to analyze. To explore the surface movement and deformation law of shallow-buried coal seam mining in a gully area, this study designed a three-dimensional similar-material simulation test simulating the complete movement and deformation of the ground surface under real terrain conditions and proposed a complete data acquisition and processing scheme. Combined with the numerical simulation analysis, we utilized this scheme to analyze the dynamic influence law of coal seam mining in a gully area on the distribution of ground surface stress and displacement as well as on the dynamic characteristics of the ground surface damage. The results show that the existence of gully topography affects the stress distribution of the ground surface and the raw rock of the coal seams underneath and that there exists a stress concentration in the gully area of the ground surface. Furthermore, the mining activities of the coal seams lead to an increase in the degree of stress concentration in the gully area of the ground surface, and the slopes enter into the process of energy accumulation and sudden release, which makes the region prone to the occurrence of geological disasters such as landslides and collapses. In addition, the surface movement and deformation in the gully area are more intense, exceeding the plain area, and the surface movement is affected by the spatial location relationship between the mining area and the slope body, causing the center of the mining area to show obvious eccentricity characteristics. The results of this study provide a reference basis for the safe mining of coal mines in gully topography.

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“…Qinshui coalfield, in Shanxi Province, is the basin coalfield with the most abundant coal in North China. It belongs to the coal-bearing strata of the Benxi Formation, Taiyuan Formation, and Shanxi formation developed in the late Paleozoic [3,4]. It is a typical geological condition for the occurrence of multiple coal seams.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Characteristics of Bedrock and Surface Failure in Mining of Shallow-Buried MCS

2022

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Coal is one of the important energy sources for industry. When it is mined, it will cause the destruction of bedrock and surface. However, it is more severe in mining shallow-buried multi coal seams (SBMCS). To better reveal the characteristics of the bedrock and surface damage, we have carried out a theoretical analysis, as well as used numerical simulations and field monitoring methods to study the surface and bedrock damage caused by the mining of SBMCS. The characteristics of bedrock and surface failure structure, settlement, and stress distribution were studied and analyzed. The findings show that the collapsed block, formed by the rupture of the overlying stratum, interacts with the surrounding rock to form large cavities and gaps, and the stress concentration occurs between them. The maximum downward vertical concentration stress is about 9.79 MPa. The mining of the lower coal seam can lead to repeated failure of the upper bedrock and goaf. The settlement of bedrock presents gradient change, and the settlement of upper bedrock is large, about 8.0 m, and the maximum settlement is 8.183 m, while that of lower bedrock is small and about 3.5–4.0 m. The weak rock stratum in the bedrock is crushed by the change stress of repeated mining, and formed a broken rock stratum. The cracks in the bedrock develop directly to the ground. On the ground, tensile cracks, compression uplift, stepped cracks, and even collapse pits are easy to cause in mining SBMCS. Affected by repeated mining, the variation of surface vertical stress is complex and disorderly in the middle of the basin, and the variation of horizontal stress is mainly concentrated on the edge of the basin. The maximum stress reaches 100 KPa, and the minimum stress is about 78 KPa. Through theoretical analysis and discussion, the size of the key blocks is directly related to the thickness and strength of the rock stratum.

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Characteristics of Overburden and Ground Failure in Mining of Shallow Buried Thick Coal Seams under Thick Aeolian Sand

Cited by 3 publications

References 41 publications

Mining Safety and Sustainability—An Overview

Mining Safety and Sustainability—An Overview

Simulation study on surface deformation of shallow buried coal seam mining in a gully area

Numerical Study on Characteristics of Bedrock and Surface Failure in Mining of Shallow-Buried MCS

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