A Thermo–Hydro–Mechanical Model: Capturing the Effects of Initial Permeability and Gas Pressure on Outburst-Prone Indicators

Shu, Cai; Wang, Hongtu; Li, Xuelong; Fan, Jinyang; Yang, Xu

doi:10.1007/s11053-019-09574-6

Cited by 9 publications

(4 citation statements)

References 53 publications

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“…The results demonstrate that for the tectonic coal from the Fengchun Coal Mine, a rapid release of a gas pressure higher than 1.6 MPa, can damage the coal mass; with the gas pressure above 2.0 MPa, the CGB may occur. Those values are much lower than that obtained with the same effective stress on raw hard/primary coal (Shu et al, 2019).…”

Section: Effect Of Gas Pressure On Outburst Intensitycontrasting

confidence: 66%

“…With the increase in gas pressure, the temperature drop shows a minor growth. The detected temperature decrease of 3-4 °C is significantly smaller than its theoretical value (20-30 °C) calculated with an adsorption heat and an expansion work during outbursts (Liu et al, 2019a;Shu et al, 2019). That discrepancy is attributed to the long response time of the temperature sensor (however, which is inevitable for most existing temperature sensors), Pt-1000, but also to the heat dissipation from coal to the metal wall of the equipment.…”

Section: Results and Analysesmentioning

confidence: 67%

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A Testing Apparatus for Gas-Driven Coal and Gas Outbursts and its Application

et al. 2022

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In this study, a multi-physics coal and gas outburst experimental apparatus is developed to allow investigating the gas-driven mechanism behind the disaster caused by coal and gas outbursts in tectonic regions. The apparatus can simulate the coal and gas outbursts under different initial geo-stresses, gas pressures and temperatures. By integrating acoustic emission sensors in the holes on axial platens, acoustic signals from coal samples during the whole test can be monitored. A series of testability experiments were conducted on the developed apparatus to verify its performance. The damage characteristics and outburst occurrence of raw coal under different gas pressures were experimentally studied and that provided a more complete theoretical basis for coal and gas outburst. The degree of fragmentation of coal samples and the mass proportion distributions of the outburst pulverized coal after outbursts under different gas pressures were analyzed, as a reference for exploring the evolutionary characteristics of coal and gas outburst with gas-driven action.

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Section: Effect Of Gas Pressure On Outburst Intensitycontrasting

confidence: 66%

Section: Results and Analysesmentioning

confidence: 67%

A Testing Apparatus for Gas-Driven Coal and Gas Outbursts and its Application

et al. 2022

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“…In the further rock, small displacement just induces deformation without fractures forming. The three overlaying rock zones of different fractures above the mined coal seam are known as "vertical three zones," namely, the caving zone, the fissure zone, and the displacement zone (Jiang et al, 2016;Shu et al, 2019). After coal mining, massive fissures and pores, capable of storing water, form in the goaf.…”

Section: Goaf Reservoirmentioning

confidence: 99%

Underground Hydro-Pumped Energy Storage Using Coal Mine Goafs: System Performance Analysis and a Case Study for China

et al. 2021

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In response to the Paris climate agreement, the Chinese government has taken actions to improve the energy structure by reducing the share of coal-fired thermal power and increasing the use of clean energy. However, due to the extreme shortage of large-scale energy storage facilities, the utilization efficiency of wind and solar power remains low. This paper proposes to use abandoned coal mine goafs serving as large-scale pumped hydro storage (PHS) reservoir. In this paper, suitability of coal mine goafs as PHS underground reservoirs was analyzed with respects to the storage capacity, usable capacity, and ventilation between goaf and outside. The storage capacity is 1.97 × 106 m3 for a typical mining area with an extent of 3 × 5 km2 and a coal seam thickness of 6 m. A typical goaf-PHS system with the energy type αw=0.74 has a performance of 82.8% in the case of annual operation, able to regulate solar-wind energy with an average value of 275 kW. The performance of the proposed goaf-PHS system was analyzed based on the reservoir estimation and meteorological information from a typical region in China. It has been found that using abandoned coal mine goafs to develop PHS plants is technically feasible in wind and solar-rich northwestern and southwestern China.

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“…Their implementation has reduced the occurrence of coal and gas outbursts to a certain extent, but an outburst can still occur when the indexes are below the warning criteria. This is primarily because coal and gas outburst are very complex [9,10].…”

Section: Introductionmentioning

confidence: 99%

A Gas Pressure Prediction Model of the Excavation Face Based on Gas Emission

Chen

Liu

2022

IJERPH

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Gas pressure is one of the important factors related to the occurrence of coal and gas outburst disasters. The accurate gas pressure forecasting is of significance for the prevention and control of a gas disaster. In this work, a gas pressure prediction model based on the sources of gas emissions was established. The verified results show that the predicted gas pressure was roughly consistent with the actual situation. This model could meet the needs of engineering projects. Coal and gas outburst dynamic phenomenon are successfully predicted in an engineering application using the model. Overall, the prediction of coal and gas outburst using the gas pressure model achieves a continuous and dynamic effect. The model can overcome both the static and sampling shortcomings of traditional methods and solve the difficulty of coal and gas outburst prediction at the excavation face. With its broad applicability and potential prospects, the model is of great importance for guiding gas drainage, and the prevention of coal and gas outburst disasters.

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A Thermo–Hydro–Mechanical Model: Capturing the Effects of Initial Permeability and Gas Pressure on Outburst-Prone Indicators

Cited by 9 publications

References 53 publications

A Testing Apparatus for Gas-Driven Coal and Gas Outbursts and its Application

A Testing Apparatus for Gas-Driven Coal and Gas Outbursts and its Application

Underground Hydro-Pumped Energy Storage Using Coal Mine Goafs: System Performance Analysis and a Case Study for China

A Gas Pressure Prediction Model of the Excavation Face Based on Gas Emission

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