Using seasonal temperature difference in underground surrounding rocks to cooling ventilation airflow: A conceptual model and simulation study

Zhu, Shufang; Cheng, Jianwei; Song, Wanting; Borowski, Marek; Zhang, Yongjun; Yu, Bo; Wang, Yue; Qi, Chang; Tukkaraja, Purushotham; Hua, Gang; Yong-gang, XU; Ghosh, Apurna; Wang, Chao; Peng, Yun

doi:10.1002/ese3.619

Cited by 25 publications

(9 citation statements)

References 11 publications

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“…The differences mentioned above cause changes in the heat balance by comparison with the areas surrounding the city. The city heats itself slowly, stores more heat overall, and passes it on again slowly to the surrounding areas, i.e., it can generally be considered an enormous heat storage unit [90,91]. Over the long term, this process increases the annual mean air and soil temperatures.…”

Section: Physical Chemistrymentioning

confidence: 99%

Detailed Hydrogeological and Hydrochemical Reassessment of Coastal Basins of Southwestern Nigeria

2021

Geol Earth Mar Sci

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prolonged residence time in the aquifer and saltwater intrusion account for the variability of hydrochemistry of groundwater in coastal aquifers [1,[11][12][13][14]. The hydrochemistry of coastal aquifers of southwestern Nigeria is highly variable due to variation in geological configurations and human activities. Groundwater contamination stemming from human activities, and inadequate sewage discharge is on the rise in Nigeria [15][16][17]. Consequently, groundwater utilized for domestic uses is problematic and hence calls for scientific scrutiny. Examining hydrochemistry and groundwater quality in coastal regions is crucial to monitor and detect groundwater contaminants sources [18][19][20][21]. Groundwater quality analysis in Abeokuta South, Nigeria by Emenike, Nnaji [17] showed that water quality parameters exhibited wide variations from location to location. Sodium, magnesium, iron (++), and EC showed the most violation of drinking water quality standards. Anthropogenetic actions are escalating threat to groundwater quality and thus call for routine monitoring of groundwater in Abeokuta. Statistical and hydrochemical modelling of groundwater quality southwestern Nigeria showed a conjunctive imprint of anthropogenic and geogenic activities influencing the increasing dissolved chemical constituents in the groundwaters

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Section: Physical Chemistrymentioning

confidence: 99%

Detailed Hydrogeological and Hydrochemical Reassessment of Coastal Basins of Southwestern Nigeria

2021

Geol Earth Mar Sci

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“…Zhou investigated the main coal and gas spontaneous combustion mines in China and found that the main causes for the frequent occurrence of GCSC symbiotic disasters are interaction of the underground mixed gas concentration field, temperature field, and fracture field. Zhu et al , studied the temperature distribution characteristics of the surrounding rock of roadway in the deep coal mine. Li et al , proposed an index of air volume safety regulation range and the judgment condition of composite disaster imbalance and extensively discussed the mutual restriction relationship under the condition of implementing disaster-prevention technical measures.…”

Section: Introductionmentioning

confidence: 99%

Study on Multipoint and Zoning Coordinated Prevention of Gas and Coal Spontaneous Combustion in Highly Gassy and Spontaneous Combustion-Prone Coal Seam

et al. 2022

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Coal spontaneous combustion in gob often induces gas explosion accidents. To solve the frequent occurrence of gas and coal spontaneous combustion (GCSC) symbiotic disaster of highly gassy and spontaneous combustion-prone short-distance coal seams, the stope space of a complex working face formed by the old gob above and the coal seam mined below in Hengda Mine is divided into three zones, a completely connected zone, a partially connected zone, and an unconnected zone, according to the connectivity degree of fractures. A numerical model is established to study the relationship between gas drainage and coal spontaneous combustion. The effects of ventilation flux in the working face, gas drainage flow in the upper corner, gas drainage flow in the high-drainage roadway, fracture grout sealing, and nitrogen injection flow on the airflow field, gas concentration field, oxygen concentration field, and the temperature field in the completely connected and partially connected zones are analyzed. A multifactor interaction relationship under the conditions of ventilation, gas drainage, and nitrogen injection is revealed, and a multipoint and zoning coordinated prevention method for the GCSC symbiotic disaster is proposed. On the basis of the proposed method, the gas drainage flow in the high-drainage roadway and corner pipe of 5333(B) working face are determined to be 45.4 and 112.1 m 3 /min, respectively, and the total nitrogen injection flow in the upper gob and the lower gob are 350 and 640 m 3 /h, respectively. The upper corner gas concentration and the return roadway maximum gas concentration are lower than 0.8% during the stoping process, and there is no spontaneous combustion risk of the gob residual coal, thus reducing the greenhouse gas emission and realizing safety mining. This study is conducive to facilitate the realization of the goal of carbon neutrality and peak carbon dioxide emissions.

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“…Rock deformation caused by thermal stress will be constrained by in situ stress, so in situ stress can be used as the boundary load of the rock physical field. With the gradual development of deep mining, thermal stress has become an increasingly prominent problem, which poses a great threat to mine production [1][2][3]. ermal stress is a major factor leading to rock fracture, and its fracture mechanism has received increasing attention.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Effect of Temperature Changes on the Physical Field of Surrounding Rock in a Deep Gold Mine

Guo

Ren

et al. 2021

Advances in Materials Science and Engineering

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To explore the fracture mechanism of surrounding rock for thermal-mechanical coupling in deep mining, the theoretical solution of the internal temperature and stress evolution of the underground chamber cold boundary subjected to cold impact was obtained by thermoelastic theory. The conduction law of temperature and the evolution characteristics of stress were studied by theoretical formulas, and the influence of the convective heat transfer coefficient on the rate of tensile stress reduction was analyzed. The results show that the theoretical solution is in good agreement with the field measured value, which proves that the theoretical calculation method adopted in this paper is reliable and accurate. When the surface of the underground chamber is impacted by the change of temperature, the cold boundary temperature drops sharply at first, then gradually slows down, and finally reaches the same temperature as the air; the tensile stress decreases sharply from the initial high-stress value, then gradually decreases, and finally tends to be stable. The effects of different convective heat transfer coefficients on the change of temperature resistance of rocks were considered by numerical simulation. The numerical simulation results show that increasing the convective heat transfer coefficient not only increases the tensile stress of the heat transfer boundary but also increases the possibility of cracks, which makes the rock easier to crack. Based on the research results, we introduced the thermal-mechanical coupling disturbance range coefficient β = L/2D (β = 6–8) and proposed that the convective heat transfer coefficient is the reference index of the deep mining support structure, which can provide a theoretical basis and technical support for the selection of support materials.

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Using seasonal temperature difference in underground surrounding rocks to cooling ventilation airflow: A conceptual model and simulation study

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 25 publications

References 11 publications

Detailed Hydrogeological and Hydrochemical Reassessment of Coastal Basins of Southwestern Nigeria

Detailed Hydrogeological and Hydrochemical Reassessment of Coastal Basins of Southwestern Nigeria

Study on Multipoint and Zoning Coordinated Prevention of Gas and Coal Spontaneous Combustion in Highly Gassy and Spontaneous Combustion-Prone Coal Seam

Investigating the Effect of Temperature Changes on the Physical Field of Surrounding Rock in a Deep Gold Mine

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