Experimental research on measurement of permeability coefficient on the fault zone under coal mine in situ

Yi, Wu; En-ying, Wang

doi:10.1007/s12517-015-2282-9

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…In the process of underground water inrush, an important issue is to determine the permeability change of the rock mass. Unfortunately, due to the influence of the geological environment, direct measurement of permeability of fault broken rocks is a challenging task [43,44]. Therefore, many previous studies have used other properties of the rock mass to indirectly predict its permeability [45,46].…”

Section: Permeability Prediction Model Based On Porositymentioning

confidence: 99%

Erosion Effect on Non-Darcy Hydraulic Characteristics of Limestone and Mudstone Mixture

2022

Geofluids

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In order to study the water inrush mechanism of faulted rock mass, a series of erosion seepage experiments were carried out to test the non-Darcy hydraulic properties of a limestone and mudstone mixture. The test results are employed to verify and modify a classic permeability prediction model. Based on the evolution of mass loss rate, the erosion process can be divided into four stages, i.e., particle rearrangement, severe erosion, mild erosion, and stable seepage. During the erosion, the sample height decreases gradually, the water pressure at outlet grows first and then keeps stable, and the porosity and permeability decrease slightly first, then grow gradually and finally keep stable. The hydraulic properties show a more significant variation in the sample within high mudstone particle contents. Through the comparison of test results and the predicted results by the classic Carman-Kozeny model, it is found that the accuracy of the model is greatly affected by lithology. Based on this investigation, a revised model is proposed which introduces a proportional coefficient related to the rock composition, so as to increase the predicted precision in variable rock composition. The forecast accuracy of the revised model is much higher than the classical one in permeability although it decreases with the increase of mudstone content.

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Section: Permeability Prediction Model Based On Porositymentioning

confidence: 99%

Erosion Effect on Non-Darcy Hydraulic Characteristics of Limestone and Mudstone Mixture

2022

Geofluids

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“…(26) to Eq. (19) and simplifying the equation, the permeability coefficient of the single-fracture heterogeneous rock can be written as…”

Section: Derivation Of the Calculation Formula Of Permeabilitymentioning

confidence: 99%

“…Permeability coefficient and permeability tensor are two main parameters that are widely sued for describing the permeability of fractured rocks [12][13][14], which are generally determined by theoretical calculation [15][16][17][18], field measurement [19], or laboratory test [20][21][22][23]. Currently, single-fracture parallel-plate hydraulic model [24] is most widely applied in theoretical estimation of seepage behaviors in fractured rocks, which assumes that the fracture has fixed ideal width.…”

Section: Introductionmentioning

confidence: 99%

Study on the Permeability of Weakly Cemented Sandstones

et al. 2019

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Fractured rocks are a type of complex media that widely exist in various projects including energy, hydraulic, and underground space engineering, whose permeability properties are a hotspot in current rock mechanics domain. Aiming at investigating the seepage characteristics of the fracture surfaces in different rock strata, uniaxial compressive test and permeability test were performed on single-fracture homogenous and heterogeneous rocks. Specifically, rock’s physical and mechanical parameters were measured in uniaxial tests while the initial width of the single fracture was determined through CT scanning. In combination with test results and the calculation model of the displacement of single-fracture heterogeneous rock under triaxial stress condition, the calculation formula of the permeability coefficient of single-fracture heterogeneous rock was derived. Results show that hydraulic pressure in the fracture can affect the permeability coefficient of the fractured rock. Hydraulic fracturing effect occurred with the increase of hydraulic pressure in the fracture, which then generates slight normal deformations of the rock masses on both two sides of the fracture surface, decreases the contact area in the fracture, and leads to the increases of both fracture width and permeability coefficient. For single-fracture rock, the lithological properties of the rock masses on both two sides of the fracture surface impose significant effects on the permeability coefficient. Under same hydraulic pressure and confining pressure, the permeability coefficient of single-fracture coarse sandstone is greatest, followed by that of single-fracture heterogeneous rock, and finally by single-fracture fine sandstone. Theoretical calculation results agree well with the test results, suggesting that the derived theoretical formula can adequately describe the variation tendencies of permeability coefficient with confining pressure and hydraulic pressure in the fracture.

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Laboratory investigation of hydraulic properties of deformable rock samples subjected to different loading paths

Yin

Jing

et al. 2019

Hydrogeol J

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Experimental research on measurement of permeability coefficient on the fault zone under coal mine in situ

Cited by 5 publications

References 9 publications

Erosion Effect on Non-Darcy Hydraulic Characteristics of Limestone and Mudstone Mixture

Erosion Effect on Non-Darcy Hydraulic Characteristics of Limestone and Mudstone Mixture

Study on the Permeability of Weakly Cemented Sandstones

Laboratory investigation of hydraulic properties of deformable rock samples subjected to different loading paths

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