A Stress-Induced Permeability Evolution Model for Fissured Porous Media

Ma, Jianjun; Wang, Jun

doi:10.1007/s00603-015-0760-8

Cited by 30 publications

(11 citation statements)

References 27 publications

(41 reference statements)

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“…Furthermore, Guha Roy and Singh [13] conducted a parametric study on fluid flow through fracture based on finite element modeling, in which, the influence of inflow pressure, aperture and shear displacement on the flow behavior were investigated. Ma et al [14] and Ma and Wang [15] investigated the correlation between permeability and external stress applied on fractured rock mass through the concept of tortuosity. Chen et al [16] conducted the experimental study to explore the effect of fracture geometric characteristics on the permeability in deformable rough-walled fractures.…”

Section: Introductionmentioning

confidence: 99%

A Unified Equation to Predict the Permeability of Rough Fractures via Lattice Boltzmann Simulation

Yin

Zhao

et al. 2019

Water

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In this paper, the fluid flow through rough fractures was investigated via numerical simulation based on the lattice Boltzmann method (LBM). The accuracy of LBM was validated through the numerical simulation of the parallel plate model and the verification of the mass conservation of fluid flow through rough fracture. After that, the effect of roughness on fluid flow was numerically conducted, in which, the geometry of fractures was characterized by the joint roughness coefficient (JRC), fractal dimension (D) and standard deviation (σ). It was found that the JRC cannot reflect the realistic influence of roughness on the permeability of single fracture, in which, an increase in permeability with increasing JRC has been observed at the range of 8~12 and 14~16. The reason behind this was revealed through the calculation of the root mean square of the first derivative of profile (Z2), and an equation has been proposed to estimate the permeability based on the aperture and Z2 of the fracture. The numerical simulations were further conducted on fluid flow though synthetic fractures with a wide range of D and σ. In order to unify the parameter that characterizes the roughness, Z2 was obtained for each synthetic fracture, and the corresponding relationship between permeability, aperture and Z2 was analyzed. Meanwhile, it was found that the fluid flow behaves differently with different ranges of Z2 and the critical point was found to be Z2 = 0.5. Based on extensive study, it was concluded that Z2 is a generic parameter characterizing the roughness, and the proposed equation could be used to predict the permeability for fluid flow in fracture.

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Section: Introductionmentioning

confidence: 99%

A Unified Equation to Predict the Permeability of Rough Fractures via Lattice Boltzmann Simulation

Yin

Zhao

et al. 2019

Water

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“…If the solid matrix is assumed to be nondeformable, the deformation mainly comes from the change in the pore space. Therefore, the porosity can be expressed as [18] φ…”

Section: Porosity Evolution With Deviatoric Stressmentioning

confidence: 99%

“…Permeability decreases continuously at both of the two different failure modes due to compression of microcracks and increase in tortuosity [13][14][15][16][17]. For brittle faulting, porosity firstly decreases in the volumetric compression stage and then increases during volumetric dilation, while the porosity will continuously decrease for ductile flow [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Porosity and Permeability Evolution with Deviatoric Stress of Reservoir Sandstone: Insights from Triaxial Compression Tests and In Situ Compression CT

Agostini

Jia

2020

Geofluids

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Porosity and permeability are the two most important characteristics of underground gas storage in sandstone reservoirs. Injection of gas into reservoir rocks will cause rock deformation. The deformation will influence the porosity and permeability properties of the rocks. We investigate the evolution of these two properties of storage sandstone by triaxial compression tests and a uniaxial in situ compression CT test. As the deviatoric stress increases, the sandstone is compressed firstly (porosity reduction) and then dilates (porosity enhancement). With the increase in confining stress, the occurrence of volumetric dilation will be delayed. Trapped porosity of this sandstone at different deviatoric stresses is very small (0.122%-0.115%) which indicates that nearly all pores are connected. During the compression stage, the decrease in permeability is related to compression of pores and microcracks. During the volumetric dilation stage, it is related to increase in tortuosity. This interpretation can be confirmed by observations of in situ compression CT. The permeability evolution estimated by pore network modeling is consistent with macroscopic testing results.

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“…As the strain caused by damage does not contribute to the nominal stress, the constitutive equation of the welded bimrocks in any damage state should be as follows [38,39]:…”

Section: Damage Constitutive Modelmentioning

confidence: 99%

“…To obtain the damage evolution equation, it is necessary to establish the internal relation between the total strain and damage. Considering an arbitrary element of the bimrocks, the relation can be obtained according to the law of energy conservation [37][38][39], as follows:…”

Section: Damage Constitutive Modelmentioning

confidence: 99%

Predicting the Mechanical Properties of Bimrocks with High Rock Block Proportions Based on Resonance Testing Technology and Damage Theory

et al. 2019

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Block-in-matrix-rocks (bimrocks) are very complicated geological masses that cause many challenging problems during the design and construction of engineering projects, such as parameter determination and landsliding. Successful engineering design and construction depends on a suitable constitutive model and reliable design parameters for geological masses. In this paper, the vibration attenuation signal of welded bimrocks was obtained and studied using resonance test technology. Combined with a uniaxial compression test, a constitutive model was proposed to describe the mechanical behavior of welded bimrocks. On this basis, the relations between the dynamic elastic modulus and the physical parameters of bimrocks were established, which included macroscopic mechanical parameters and damage constitutive parameters. Consequently, a new technological process was proposed to provide quick identification of the mechanical properties of welded bimrocks. The results indicate that the dynamic elastic modulus is highly correlated with the rock block proportion (RBP) and uniaxial compression strength (UCS). It is an effective parameter to predict the strength of the bimrocks with high RBPs. Additionally, the proposed constitutive model, which is based on damage theory, can accurately simulate the strain softening behavior of the bimrocks. Combining the resonant frequency technology and the proposed constitutive model, the complete stress strain curve can be obtained in a rapid and accurate manner, which provides a further guarantee of the stability and safety of underground engineering.

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A Stress-Induced Permeability Evolution Model for Fissured Porous Media

Cited by 30 publications

References 27 publications

A Unified Equation to Predict the Permeability of Rough Fractures via Lattice Boltzmann Simulation

A Unified Equation to Predict the Permeability of Rough Fractures via Lattice Boltzmann Simulation

Porosity and Permeability Evolution with Deviatoric Stress of Reservoir Sandstone: Insights from Triaxial Compression Tests and In Situ Compression CT

Predicting the Mechanical Properties of Bimrocks with High Rock Block Proportions Based on Resonance Testing Technology and Damage Theory

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