Study on Evaluation and Prediction of the Degree of Surface Damage Caused by Coal Mining

Xie, Xiaoshen; Hou, Enke; Long, Tianwen; Feng, D. L.; Hou, Peng; Wei, Qiming; Li, Yang; Liu, Jiangbin

doi:10.3389/feart.2021.805248

Cited by 2 publications

(1 citation statement)

References 30 publications

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“…The old goaf has been compacted for a long time, there is still heterogeneous rock mass in some areas. Under construction and other external environments, ground subsidence, cracks (Xie et al, 2022), and even collapse (Dong L. J. et al, 2021) can occur, causing severe damage to the buildings above it. The characteristics of the heterogeneous rock mass in the old mine goaf have become a difficult problem restricting the urbanization above it.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous rock mass detection in the Goaf underlying the Yingbin substation

Dong

Zhang²,

Xie³

et al. 2022

Front. Earth Sci.

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The existence of heterogeneous rock mass in the goaf easily causes surface deformation, subsidence, and even collapse, which restricts the development of urbanization of the buildings above the goaf. Because of the saturation of the city and the shortage of power supply, the idea of building the Yingbin substation was proposed on the old coal mine goaf in Xinhua District, Pingdingshan City, Henan Province, China. To ensure the safety and stability of the foundation of the proposed substation, the comprehensive detection method was proposed, which is mainly based on transient electromagnetic detection and supplemented via drilling detection. It was used to determine the spatial position and location of heterogeneous rock mass in the goaf underlying the proposed substation. The results show that 1) after eliminating the interference to the transient electromagnetic detection, it is found that there are low-resistance anomalies near the depth of −160 m at points 1 to 2 and point 8 of the X2 line and at points 1 to 3 of the Y3 line, which are preliminarily presumed to be the influence of the heterogeneous rock mass. 2) The apparent resistivity anomalous areas of −160 and −200 m depth are highly consistent, and the location and scope of the heterogeneous rock mass were basically determined. 3) The abnormal depth range of core rate obtained by drilling is in good agreement with the abnormal range of apparent resistivity at the same location obtained by transient electromagnetic, which indicates the reliability of the detection results. 4) Combining the detection results of the two methods, the location and scope of the heterogeneous rock mass were basically determined, which is located in the western part of the proposed area. The detection results can provide a basis for the safety and stability of the proposed substation foundation. To ensure the safe and stable operation of the proposed substation foundation, effective governance measures for the heterogeneous rock mass of the goaf should be taken.

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Section: Introductionmentioning

confidence: 99%

Heterogeneous rock mass detection in the Goaf underlying the Yingbin substation

Dong

Zhang²,

Xie³

et al. 2022

Front. Earth Sci.

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Evaluation of Long-Term Tightness of the Coal Pillar Dam of Underground Reservoir and Protection Countermeasures

Zhang

Guo²,

Liu

2022

Energies

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The coal mine underground reservoir is an effective facility for mine groundwater utilization in water-deficient and ecologically fragile areas. Usually, the artificial reserved coal pillar is used as the dam of underground reservoir, and little research has been done on its tightness performance. Comsol software is used to simulate the leakage of underground reservoirs in Shendong area, in the western part of China, and the long-term tightness of coal pillar dam under different operation conditions is evaluated. The results show that: (1) When the underground reservoir is not connected with the upper water system, the coal pillar dam has good tightness performance. When they are connected, the leakage of reservoir increased due to the raised water level, and the deeper the burial depth, the greater the leakage amount. (2) When reservoir is pumping and storing water, the leakage is only half of that under constant water pressure storage, indicating that this operation mode is beneficial to the long-term tightness of a coal pillar dam. (3) With the increase of the permeability of a coal pillar dam, the leakage will be aggravated. It is suggested that the permeability of a coal pillar dam should not exceed 1 × 10−15 m2. (4) The tightness of the coal pillar dam damaged by brine immersion is greatly reduced. With only 3 m of soaking damage distance, the total leakage is twice that of the undamaged one. For a coal pillar dam with poor tightness, some protection countermeasures are proposed to reduce the reservoir water level or improve the anti-seepage performance of a coal pillar dam, so as to ensure the long-term tightness of the dam. This research can provide theoretical support and technical guidance for evaluating the seepage stability of a coal pillar dam in an underground reservoir and strengthening its seepage control.

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Study on Evaluation and Prediction of the Degree of Surface Damage Caused by Coal Mining

Cited by 2 publications

References 30 publications

Heterogeneous rock mass detection in the Goaf underlying the Yingbin substation

Heterogeneous rock mass detection in the Goaf underlying the Yingbin substation

Evaluation of Long-Term Tightness of the Coal Pillar Dam of Underground Reservoir and Protection Countermeasures

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