Permeability characteristics of layered composite coal-rock under true triaxial stress conditions

Lü, Jun; Yin, Guangzhi; Deng, Bangming; Zhang, Weizhong; Li, Minghui; Chai, Xiuwei; Liu, Chao; Liu, Yubing

doi:10.1016/j.jngse.2019.03.023

Cited by 53 publications

(29 citation statements)

References 38 publications

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“…Currently, domestic and foreign scholars have studied the permeability properties of bedded coal and rock and obtained abundant research results. On the one hand, many scholars have studied on the permeability properties of bedded coal and rock under true triaxial loading or unloading conditions 16‐30 . Yin's team developed the multi‐functional true triaxial fluid–solid coupling test system.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, they analyzed the stress path effect, unloading effect, lithology effect, coal-rock combination effect, anisotropy, intermediate principal stress effect, and other factors on the permeability properties of bedded coal, shale, sandstone, and coal-rock combination. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] Additionally, the anisotropic permeability evolution characteristics of bedded coal, shale, sandstone, and coal-rock combination were better characterized. Meanwhile, the permeability evolution models of bedded coal and rock under X, Y, and Z direction were both constructed, which revealed the mechanical mechanism of deformation and permeability of bedded coal and rock under true triaxial condition.…”

mentioning

confidence: 99%

“…Meanwhile, the permeability evolution models of bedded coal and rock under X, Y, and Z direction were both constructed, which revealed the mechanical mechanism of deformation and permeability of bedded coal and rock under true triaxial condition. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] On the other hand, many scholars have studied on the permeability properties of bedded coal and rock under the conventional triaxial loading or unloading conditions. Li et al 31 studied the permeability properties of coal with bedding angles of 0°, 45°, and 90° under triaxial loading with different impact rates and established the corresponding permeability evolution models.…”

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confidence: 99%

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The permeability properties of bedded coal and rock: Review and new insights

Song

Zhang

et al. 2022

Energy Science & Engineering

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It is beneficial to understand deeply the permeability properties of coal and rock for the stability control of mining engineering, underground engineering, oil and gas engineering, nuclear waste storage engineering, and so on. Therefore, new insights for the permeability properties of bedded coal and rock are summarized and proposed. (1) "Five guarantees" coring technology is worth for vigorous promotion and application. (2) The internal spatial fabric has the significant effect on the mechanical behavior evolution law of (bedded) coal and rock, but the effect is not dominant. (3) The permeability‐energy evolution models of (bedded) coal and rock should be constructed considering the idea of initial high in situ stress reduction, which is helpful for the energy visualization characterization of (bedded) coal and rock. Meanwhile, it can be combined with the structural evolution theory for in‐depth characterization and disclosure. (4) Researches on the permeability properties of (bedded) coal and rock under multi‐field or multi‐phase or phase‐field coupling conditions should be strengthened based on considering the initial damage produced and the distribution characteristics of in situ stress under the coring environment. (5) More accurate and scientific permeability evolution models of (bedded) coal and rock should be vigorously constructed based on the above insights.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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The permeability properties of bedded coal and rock: Review and new insights

Song

Zhang

et al. 2022

Energy Science & Engineering

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“… 5 Lu et al studied the dynamic permeability evolution characteristics of layered composite coal under true triaxial stress conditions. 6 Ju et al and Zhang et al discussed the permeability characteristics of coal gas under three typical coal seam mining stress paths. 7 , 8 Jiang et al studied the seepage characteristics of cyclic mining stress on gas-bearing coal.…”

Section: Introductionmentioning

confidence: 99%

Studies on Gas Seepage Characteristics in Different Stress Zones of Bottom Coal in Steeply Inclined and Extra-Thick Coal Seams under Mining Action

Fan

Wang

2021

ACS Omega

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The gas released from the bottom coal of the horizontal slicing mining face in steeply inclined and extra-thick coal seams seriously threatens the safety of the upper slicing mining face. To explore the seepage characteristics of bottom coal gas, the coal deformation and gas permeability evolution law of four coal samples in different stress zones of bottom coal in the working face were analyzed through true triaxial fluid–solid coupling seepage experiments. At the same time, the seepage capacity of bottom coal gas was partitioned according to the field test. The results show the following: (1) The gas permeability of the bottom coal stress concentration zone first decreased and then increased with axial pressure loading and confining pressure unloading. The gas permeability of the bottom coal stress relief zone increased rapidly with decreasing axial pressure and confining pressure. The gas permeability of the bottom coal stress recovery zone gradually decreased with the cyclic loading and unloading of axial pressure and tended to be stabilized. (2) The evolution law of gas permeability in the bottom coal was closely related to the damage and deformation of coal. (3) From the original stress zone to the stress recovery zone, the gas seepage capacity of bottom coal can be divided into four zones, namely, the original seepage zone, the seepage reduction zone, the seepage sharp increase zone, and the seepage reduction zone. The gas seepage capacity in the stress concentration zone was more substantial than that of the stress recovery zone. The results of this study are of great significance for strengthening the dynamic disaster prevention and control of bottom coal gas in the horizontal slicing mining face of steeply inclined and extra-thick coal seams.

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“…Moosavi et al [41] thought that in the whole stress-strain process, the permeability varied in different ways in the elastic stage, the elastic-plastic stage, and the residual flow stage due to the different deformation degrees of rock samples. Killough et al [42], Agheshlui et al [43], and Lu et al [44] constructed single function mathematical models such as cubic polynomial, logarithmic function, and power function of confining pressure and permeability, respectively. Many studies have focused on the variations, influence mechanisms, and mathematical models of the relationship between rock permeability and stress.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Relative Permeability Characteristics for CO2 in Sandstone under High Temperature and Overburden Pressure

et al. 2021

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In this study, CO2 seepage of sandstone samples from the Taiyuan-Shanxi Formation coal seam roof in Ordos Basin, China, under temperature-stress coupling was studied with the aid of the TAWD-2000 coal rock mechanics-seepage test system. Furthermore, the evolution law and influencing factors on permeability for CO2 in sandstone samples with temperature and axial pressure were systematically analyzed. The results disclose that the permeability of sandstone decreases with the increase in stress. The lower the stress is, the more sensitive the permeability is to stress variation. High stress results in a decrease in permeability, and when the sample is about to fail, the permeability surges. The permeability of sandstone falls first and then rises with the rise of temperature, which is caused by the coupling among the thermal expansion of sandstone, the desorption of CO2, and the evaporation of residual water in fractures. Finally, a quadratic function mathematical model with a fitting degree of 98.2% was constructed between the temperature-stress coupling effect and the permeability for CO2 in sandstone. The model provides necessary data support for subsequent numerical calculation and practical engineering application. The experimental study on the permeability characteristics for CO2 in sandstone under high temperature and overburden pressure is crucial for evaluating the storage potential and predicting the CO2 migration evolution in underground coal gasification coupling CO2 storage projects.

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Permeability characteristics of layered composite coal-rock under true triaxial stress conditions

Cited by 53 publications

References 38 publications

The permeability properties of bedded coal and rock: Review and new insights

The permeability properties of bedded coal and rock: Review and new insights

Studies on Gas Seepage Characteristics in Different Stress Zones of Bottom Coal in Steeply Inclined and Extra-Thick Coal Seams under Mining Action

Experimental Study on Relative Permeability Characteristics for CO2 in Sandstone under High Temperature and Overburden Pressure

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