Gas Permeability and Porosity Evolution of a Porous Sandstone Under Repeated Loading and Unloading Conditions

Wang, H. L.; Xu, Weiya; Cai, Ming; Xiang, Zuping; Kong, Qing

doi:10.1007/s00603-017-1215-1

Cited by 60 publications

(20 citation statements)

References 29 publications

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“…Li et al [13] found that the impacts of confining pressure and pore pressure on the permeability of sandstone were notable during the postpeak phase but were less substantial during the prepeak phase. The gas permeability variation of sandstone samples under confining pressure was also studied by Wang et al [14], who indicated that gas permeability was greater after unloading than before loading and was greater during the process of loading than during unloading under an equivalent confining pressure. In addition, stress, seepage, and temperature have been coupled in studies [15] of the permeability variation law under more complicated practical conditions.…”

Section: Introductionmentioning

confidence: 90%

Experimental Study on the Permeability of Weakly Cemented Rock under Different Stress States in Triaxial Compression Tests

et al. 2018

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Mudstone and shaly coarse sandstone samples of Jurassic units in northwestern China were collected to study the seepage mechanism of weakly cemented rock affected by underground mining operations. Samples were studied using seepage experiments under triaxial compression considering two processes: complete stress-strain and postpeak loading and unloading. The results show that permeability variations closely correspond to deviatoric stress-axial strain during the process of complete stress-strain. The initial permeability is 7 times its minimum, contrasting with lesser differentials of initial, peak, and residual permeability. The magnitude of permeability ranges from 10−17 to 10−19 m2, representing a stable water-resisting property, and is 1 to 2 orders lower in mudstone than that in shaly coarse sandstone, indicating that the water-resisting property of the mudstone is much better than that of the shaly coarse sandstone. Permeability is negatively correlated with the confining pressure. In response to this pressure, the permeability change in mudstone is faster than that in shaly coarse sandstone during the process of postpeak loading and unloading. Weakly cemented rock has lower permeability according to the comparison with congeneric ordinary rocks. This distinction is more remarkable in terms of the initial permeability. Analyses based on scanning electron microscope (SEM) observations and mineral composition indicate that the samples are rich in clay minerals such as montmorillonite and kaolin, whose inherent properties of hydroexpansiveness and hydrosliming can be considered the dominant factors contributing to the seepage properties of weakly cemented rock with low permeability.

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Section: Introductionmentioning

confidence: 90%

Experimental Study on the Permeability of Weakly Cemented Rock under Different Stress States in Triaxial Compression Tests

et al. 2018

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“…Measurement of wave velocity is one of the most common (Rao and Ramana 1992;Lockner 1993;Meglis et al 1995;Brantut et al 2014;Voznesenskii et al 2017). Microscopic thin sections are also often provided (Ghamgosar and Erarslan 2016;Wang et al 2017). Tomography techniques are used in Chow et al (1995) to assess the damage evolution of a rock sample.…”

Section: Crack Development and Measurementmentioning

confidence: 99%

“…Both initial and final values are impossible to obtain for acoustic emissions which is therefore not suitable. Volumetric deformation is shown (2015), Mitchell and Faulkner (2008), Wang et al (2017) to decrease in some cases (Eberhardt et al 1999) and is not considered in the following. Finally, Xiao et al (2010) compare the evolution of different damage indicators related to a same experiment.…”

Section: Indicator Of Fatiguementioning

confidence: 99%

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Cyclic and Fatigue Behaviour of Rock Materials: Review, Interpretation and Research Perspectives

Cerfontaine¹,

Collin²

2017

Rock Mech Rock Eng

295

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“…Based on uniaxial compression and triaxial compression tests, Ma et al [13] studied the influence of the loading rate and confining pressure on the energy dissipation characteristics of coal samples. In addition, many scholars have studied the mechanical and acoustic emission characteristics of sandstone under different stress paths [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Energy Evolution in Sandstone Failure during Triaxial Unloading Confining Pressure Tests

Yang

2019

Advances in Civil Engineering

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The deformation and failure of sandstone samples are closely related to energy changes in the material. To explore the energy evolution during the process of sandstone sample damage, loading and unloading tests with different test paths were conducted. The results show that more energy is stored and consumed before the stress reaches its peak, while after the peak stress, more energy is released and consumed. Energy dissipation increases internal cracking, leads to sample damage and lithologic deterioration, and reduces the bearing capacity of the sample. During triaxial unloading of the confining pressure, the higher the initial unloading confining pressure, the more the elastic energy stored, and the more the energy released when the sandstone sample fails, resulting in more severe damage. Therefore, during the excavation of high-stress rock masses, large amounts of elastic energy stored in sandstone can be rapidly released, leading to rock burst disasters. Additionally, during triaxial unloading confining pressure tests, the damage in sandstone when the sample is close to failure increases more rapidly than that during conventional triaxial compression tests because of the unloading effect of the confining pressure. This phenomenon also illustrates that the failure of sandstone induced by unloading is more sudden than that induced by loading.

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Gas Permeability and Porosity Evolution of a Porous Sandstone Under Repeated Loading and Unloading Conditions

Cited by 60 publications

References 29 publications

Experimental Study on the Permeability of Weakly Cemented Rock under Different Stress States in Triaxial Compression Tests

Experimental Study on the Permeability of Weakly Cemented Rock under Different Stress States in Triaxial Compression Tests

Cyclic and Fatigue Behaviour of Rock Materials: Review, Interpretation and Research Perspectives

Experimental Investigation of Energy Evolution in Sandstone Failure during Triaxial Unloading Confining Pressure Tests

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