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Article
Modification of Microstructural and Fluid Migration of Bituminous Coal by Microwave–LN2 Freeze–Thaw Cycles: Implication for Efficient Recovery of Coalbed Methane
To improve the efficiency of coalbed methane and recoverability of reservoirs, enhanced fracturing technology is usually required to improve the low porosity and permeability status of coal reservoirs. As a fe...
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Article
Study on the Law of Fracture Development in Plasma-Induced Broken Coal
The plasma-induced crushing technology is an efficient method for coal seam cracking. To study the law of fracture development in coal during plasma-induced breakage, this study established an experiment platf...
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Article
Constitutive relation and particle size distribution model of rock fragments in the goaf
Permeability is considered a key parameter used in goaf flow simulation. Particle size of caved rock fragments is an important factor that affects permeability. Current literature treats the particle sizes of ...
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Article
Parameter optimization of coal face blasting for coal and gas outburst control
Coal and gas outbursts represent a major risk in deep gassy coal mines, and de-stress blasting is a commonly applied technology to prevent coal face outbursts. This paper systematically studies the effects of ...
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Article
Porosity model of the goaf based on overlying strata movement and deformation
In view of the complexity and concealment of goafs, numerical simulations have become an important means for studying the coupling disasters of spontaneous coal combustion and gas. Porosity is an important par...
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Article
Experimental study on drill bit torque influenced by artificial specimen mechanical properties and drilling parameters
Mechanical properties abruptly change of the coal around small geological structures can easily induce dynamic disasters such as coal and gas outbursts. Some research show that the variation of coal and rock m...
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Article
Open AccessMechanical criterion for coal and gas outburst: a perspective from multiphysics coupling
Although a series of hypotheses have been proposed, the mechanism underlying coal and gas outburst remains unclear. Given the low-index outbursts encountered in mining practice, we attempt to explore this mech...
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Article
Effect of Slot Inclination Angle and Borehole-Slot Ratio on Mechanical Property of Pre-cracked Coal: Implications for ECBM Recovery Using Hydraulic Slotting
Low permeability is the main constraint on the high-efficiency coalbed methane recovery in deep coal seams. Hydraulic slotting has been proved to be a favorable method to stimulate low-permeability coal seams....
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Article
Study of Effects of Hard Thick Roof on Gas Migration and Field Experiment of Roof Artificially Guided Pre-splitting for Efficient Gas Control
Due to high gas content, high geo-stress and complex geological conditions, gas disasters occur frequently in deep coal mining. The hard thick roof (HTR) greatly increases the difficulty of coalbed gas control...
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Article
Mechanical Evolution Mechanism of Coal and Gas Outburst
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Article
Modeling the relationship between macro- and meso-parameters of coal using a combined optimization method
From a mesoscopic perspective, coal is a complicated net-shaped force-bearing system. It is reasonable to simulate this complicated system by particles and parallel bonds among the particles. Based on this co...
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Article
Coal Permeability Evolution and Gas Migration Under Non-equilibrium State
Laboratory test of coal permeability is generally conducted under the condition of gas adsorption equilibrium, and the results contribute to an understanding of gas migration in the original coal seams. Howeve...
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Article
An integrated technology for gas control and green mining in deep mines based on ultra-thin seam mining
With the increasing demand for coal resources, coal mining has gradually entered into the deep strata of coal seams. Although the increase in mining depth improves energy security, it is associated with severe...
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Article
Investigation on the selective adsorption and separation properties of coal mine methane in ZIF-68 by molecular simulations
Methane adsorption separation by ZIF-68 had been investigated using Grand Canonical Monte Carlo and Molecular dynamics simulations. Results show that ZIF-68 is a more desirable material for CH4 separation, even w...
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Article
Cracking Process and Stress Field Evolution in Specimen Containing Combined Flaw Under Uniaxial Compression
Hydraulic slotting, an efficient technique for underground enhanced coal bed methane (ECBM) recovery, has been widely used in China. However, its pressure relief mechanism is unclear. Thus far, only limited re...
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Article
Molecular simulation study of metal organic frameworks for methane capture from low-concentration coal mine methane gas
Methane and nitrogen are the main components in the coal mine drainage gases. However, it is the most difficult to separate methane from CH4 to N2 mixtures due to the completely nonpolar molecule for these two co...
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Article
Coal permeability-improving mechanism of multilevel slotting by water jet and application in coal mine gas extraction
Multilevel slotting by water jet is one of the effective methods used to improve the coal seam permeability. As the example of the 1603 working face of Guhanshan Coalmine, first, using acoustic emission techno...
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Article
Open AccessDevelopment and application of an efficient gas extraction model for low-rank high-gas coal beds
To promote gas extraction in low-rank high-gas coal beds, the pore structure characteristics of the coal and their effect on gas desorption were studied. The results show that micropores are relatively rare in...
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Article
A new technique for preventing and controlling coal and gas outburst hazard with pulse hydraulic fracturing: a case study in Yuwu coal mine, China
Coal and gas outburst is one of the main gas hazards in coal mines, and pulse hydraulic fracturing is a new technique for preventing and controlling gas hazards in coal mines and is presented based on conventi...
