Mechanical Model on Water Inrush Assessment Related to Deep Mining Above Multiple Aquifers

Liu, Yin; Ma, Kai; Chen, Juntao; Xue, Yanchao; Wang, Ziqi; Cui, Boqiang

doi:10.1007/s10230-019-00623-3

Cited by 21 publications

(5 citation statements)

References 18 publications

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“…Despite the continuous increase in the production and use of new energy, coal still plays a key role in the global fossil fuel supply system (Chen et al, 2014; Bi et al, 2021; Ju et al, 2020; Dong et al, 2020). It is the major energy source for electricity, residential heating, and industrial production in most countries (Qiao et al, 2019; Yin et al, 2019b). However, with the large-scale development of coal resources in China (Song et al, 2021; Yin et al, 2019a), especially with the increase and expansion of mining depth (Ruan et al, 2019), coal mining is bound to damage the surrounding rock structure of the aquifers (Shi et al, 2019a; Fan et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Source identification of mine water inrush based on the exponential whitenization function and the grey situation decision model

Wang¹,

Wang³

et al. 2022

Energy Exploration & Exploitation

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Coal mining at deep levels can cause mine water inrush and groundwater contamination, making it important to accurately and rapidly identify the water inrush source. In this study, 52 water samples were extracted from three types of aquifers in the Linhuan mining area, China. The water sample components Na+ + K+, Ca2+, Mg2+, HCO3−, Cl−, and SO42−, measured in the experiment, were used as evaluation variables, and the piecewise function equation was established by using the exponential whitening function. Finally, combined with water sample data and the CRITIC weighted grey situation decision-making method, the comprehensive membership degree was obtained, and the water inrush source was identified according to the principle of the maximum membership degree. The comprehensive accuracy of the model was 92.3%. The traditional grey situation decision-making method uses the linear whitening function to determine the membership value, ignoring that the value of the whitening function outside the adjacent level is 0, which improves the weight of the adjacent level, causes the loss of effective information, and reduces the discrimination rate. The exponential whitenization function in this paper will solve this problem and further improves the grey situation decision-making method to discriminate the water inrush source, which would also be beneficial regarding the prevention and control of mine water inrush and groundwater contamination.

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Section: Introductionmentioning

confidence: 99%

Source identification of mine water inrush based on the exponential whitenization function and the grey situation decision model

Wang¹,

Wang³

et al. 2022

Energy Exploration & Exploitation

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“…The current state of crustal stress in China varies with depth and is closely related to the mode of fault activity. Therefore, in most areas, the horizontal stress is greater than the vertical one [6][7][8][9]. So the horizontal stress in the deep coal stope has a far greater and more complicated influence than the vertical stress.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Influence of PVA Content on the Performance of Grouting Material in Deep Stope

Liu

Chen

et al. 2021

Geofluids

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Based on laboratory experiments, the paper researches the effect of polyvinyl alcohol (PVA) content on the performance of fly ash-based cement grouting materials. The test results show that the addition of PVA has limited effect on the initial and final setting time and brings a certain but minor delay on the appearance of the hydration peak period. It enhances cement hydration during the hydration slow down period. The impermeability of PVA to the grouting material is obviously improved, and it increases with the growing amount of PVA content. PVA improves the flexural strength and compressive strength of the sample block to varying degrees, and the improvement on flexural strength is more obvious than that on the compressive strength. It has a significant effect on the mechanical properties of the grouting material and can effectively improve the rock mass’s hydraulic coupling characteristics. It also has great application value and practical significance for the prevention and control of water hazards in deep coal stopes.

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“…In recent years, the failure mechanism of a longwall panel floor above a confined aquifer attracted great concerns [6][7][8][9]. For example, Liu et al [10] conducted mathematical modelling to describe the failure of an inclined coal seam floor above confined water and calculated the failure depth after mining based on semi-infinite element theory.…”

Section: Introductionmentioning

confidence: 99%

Fracture Propagation and Hydraulic Properties of a Coal Floor Subjected to Thick-Seam Longwalling above a Highly Confined Aquifer

Fan

Zhang

et al. 2021

Geofluids

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The high-pressure and water-rich confined aquifer occurring in the Ordovician limestone sequence poses great threats to the routine production of underground longwall mining. Considering the intense cooperation of mining disturbance and water pressure, water-conducting fractures within a coal seam floor can connect the lower aquifer and upper goaf, and this hydraulic behavior is considered the root of water inrush hazard and water loss or contamination. In this paper, the panel 4301 of the Longquan coal mine serves as the case where the panel works closely above the floor with high water pressure. By the combination of physical and numerical modelling approaches, the variation characteristics of fracture development and volumetric strain of floor rocks subjected to mining disturbance are analyzed. A numerical computation model is constructed based on the volumetric strain-permeability equation obtained by curve fitting, and on such basis, the impacts of different mining parameters on floor rock permeability are studied. The results show that the floor rocks experience fracture generation, extension, and convergence procedures as the workface advances along the longitudinal direction, and fractures appearing in front of the workface are more developed. In the whole process of coal seam extraction, the volumetric strain profile exhibits “Λ” shape and an inverted saddle shape before and after overburden strata collapse. By controlling a single variable, the paper reveals that panel height is of greater impact on floor permeability changes than panel length and panel width.

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Mechanical Model on Water Inrush Assessment Related to Deep Mining Above Multiple Aquifers

Cited by 21 publications

References 18 publications

Source identification of mine water inrush based on the exponential whitenization function and the grey situation decision model

Source identification of mine water inrush based on the exponential whitenization function and the grey situation decision model

Experimental Study on the Influence of PVA Content on the Performance of Grouting Material in Deep Stope

Fracture Propagation and Hydraulic Properties of a Coal Floor Subjected to Thick-Seam Longwalling above a Highly Confined Aquifer

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