Improvement of upper limit of mining under an aquifer of a super thick unconsolidated layer in Huainan based on multi-physics field monitoring

Sun, Binyang; Zhang, Pingsong; Wu, Rongxin; Fu, Maoru; Ou, Yuanchao

doi:10.1080/08123985.2020.1780116

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…Hence, limiting the mining height is an important mining strategy that can effectively solve the risk of separation water inrush. 46 If it is too high, the fracture caused by water flowing can connect the separation space, causing water accumulation to be difficult. In contrast, if the mining height is low, it can not only increase the aquiclude thickness but also reduce the maximum development height of the separation space.…”

Section: Discussionmentioning

confidence: 99%

“…In the model, the mining height of the working face is the most important index, which can directly affect the formation of separation water. Hence, limiting the mining height is an important mining strategy that can effectively solve the risk of separation water inrush . If it is too high, the fracture caused by water flowing can connect the separation space, causing water accumulation to be difficult.…”

Section: Discussionmentioning

confidence: 99%

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Evaluation on the Risk of Water Inrush Due to Roof Bed Separation Based on Improved Set Pair Analysis–Variable Fuzzy Sets

Zhang

Wang

et al. 2022

ACS Omega

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To study and prevent bed separation water inrush accidents in coal mines, it is necessary to evaluate the risk according to the limited geological data correctly. In this work, based on hydrogeological and mining conditions, we established a risk evaluation model and selected seven important factors, including the aquifer thickness, aquifer water abundance, hydraulic pressure of the aquifer, effective aquifuge thickness, mining failure ratio, mining height of the working face, and advancing distance as evaluation indexes. The intuitionistic fuzzy analytic hierarchy process (IFAHP) and entropy weight method (EWM) were used to analyze the weights of the original data, and the minimum information entropy principle was used to further integrate the abovementioned calculation results. With the weight results, set pair analysis–variable fuzzy set (SPA-VFS) theory was applied to determine the risk grade of each working face, which provided scientific guidance for the safe mining of coal mines. For the working face where water inrush may occur, the risk of bed separation water inrush can be reduced by optimizing the parameters or changing the mining conditions through the model analysis.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Evaluation on the Risk of Water Inrush Due to Roof Bed Separation Based on Improved Set Pair Analysis–Variable Fuzzy Sets

Zhang

Wang

et al. 2022

ACS Omega

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“…With the continuous progress of science and technology, in addition to the traditional drilling fluid method, the micro-earthquake method, acoustic wave CT detection, resistivity method and digital drilling camera detection have been developed (Chen et al 2019;Sun et al 2021;Wei et al 2017;. In this paper, the double-ended water plugging leak detection method is used to detect the hole.…”

Section: Field Testingmentioning

confidence: 99%

A Case Study on Development of Water-flow Fractured Zone During Close-Distance Repeated Coal Mining

Luan

Shi

Shui

et al. 2021

Preprint

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The upper and lower seam of seam No.3 of some coal mines in Shandong Province are in close proximity which can be regards as close-distance coal seam mining.This paper takes the close-distance working face of Fucun coal mine as engineering background and mainly focuses on the investigation and research on inaccuracy of the forecasting and incompetence of the developing principles of water-flow fractured zone(WFFZ)during close-distance coal seam group mining.First,calculations on the height of WEEZ by adopting empirical formula.And FLAC3D software was established to calculate the height of the overburden WFFZ after repeated mining of the upper and lower seam of seam No.3.At the same time,using the double-ended water plugging observation technology of downhole drilling and upward hole drilling by analyzing the water injection loss ratio of the reference hole and the post-mining hole,the accurate numerical values of the WFFZ and the ratio of WFFZ height to mining height(W-M ratio)are obtained.The comparative analysis shows that the numerical simulation results are close to the measured ones,and the empirical formula is not applicable to the near-distance repeated mining.Finally,the prediction model is established based on the measured height of the WFFZ of multiple working faces,which provides a scientific basis for further exploring the development law of the overlying rock in underwater coal mining and ensuring the safe mining of coal seams at close distances.

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“…In most cases, field exploration is completed based on a single physical property and it is also less likely for their detection accuracy to meet the requirements of precision exploration. Therefore, the multi-physics testing technology has also conducted a lot of research on the deformation and failure of the surrounding rock [10] [11].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Experimental Study on the Migration Law of the Floor at the Mining Face

Guo¹,

Jiang²

2020

OJG

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Under the circumstance that deep mining is increasingly vulnerable to underlying limestone water, accurate detection of floor failure depth ranges at a mining face becomes rather critical to coal mine production in safety. Underground borehole fiber optic sensing technology is combined with 2-D parallel electrical surveying to comprehensively monitor and analyze development laws of floor deformation and failure. Moreover, a working face 1022 in a mine of Huaibei Mining Area was taken, for example, introducing the layout of monitoring borehole and installation of relevant sensing units. Based on the stope progress of a working face, data related to strain and geoelectric fields were collected regularly to analyze relationships of field source variation characteristics and strata deformation failures. In this way, the development mechanism of the floor deformation failure can be revealed. As demonstrated by results, the depth failure of the floor at coal seam 10 is calculated to be 15 m, while its disturbance depth turns out to be 22 m. Due to advanced stress, concentrated stope load and post-mining pressure relief, the floor experienced elastic deformation, shear deformation and swelling deformation successively. Without a doubt, testing results obtained have scientific guiding significance for mines with similar geological conditions.

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Improvement of upper limit of mining under an aquifer of a super thick unconsolidated layer in Huainan based on multi-physics field monitoring

Cited by 5 publications

References 13 publications

Evaluation on the Risk of Water Inrush Due to Roof Bed Separation Based on Improved Set Pair Analysis–Variable Fuzzy Sets

Evaluation on the Risk of Water Inrush Due to Roof Bed Separation Based on Improved Set Pair Analysis–Variable Fuzzy Sets

A Case Study on Development of Water-flow Fractured Zone During Close-Distance Repeated Coal Mining

Comprehensive Experimental Study on the Migration Law of the Floor at the Mining Face

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