3. Joint stiffness and the deformation behaviour of discontinuous rock

Yoshinaka, Ryo; Yamabe, Tadashi

doi:10.1016/0148-9062(86)91663-3

Cited by 100 publications

(39 citation statements)

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“…For example, peak shear displacements between 0.05 and 2.71 mm were reported in the literature (Desai and Fishman, 1991;Huang et al, 2002;Yoshinaka and Yamabe, 1986). -Barton suggested that the mobilized JRC should be equal to zero when the shear displacement is greater than 100 times the peak shear displacement.…”

Section: Modified Barton's Modelmentioning

confidence: 93%

“…Studies on shear behavior of rock fractures (Aydan et al, 1990;Bandis, 1980;Bandis et al, 1981;Barton, 1982;Barton et al, 1985;Desai and Fishman, 1991;Grasselli and Egger, 2003;Homand et al, 2001;Huang et al, 2002;Jacobsson, 2004;Jacobsson, 2005a;Jacobsson, 2005b;Jacobsson, 2006a;Jacobsson, 2006b;Jacobsson and Flansbjer, 2005a;Jacobsson and Flansbjer, 2005b;Jacobsson and Flansbjer, 2006a;Jacobsson and Flansbjer, 2006b;Olsson and Barton, 2001;Van Sint Jan, 1990;Wibowo, 1994;Wibowo et al, 1993;Yoshinaka and Yamabe, 1986) were reviewed to find available monotonic direct shear test results, in which the shearing direction is constant (there is no shear unloading and reversal). Peak shear strength (τ peak ), peak shear displacement (δ peak ), peak positive dilation displacement (δ v , peak ), maximum negative dilation (δ v,min ), and shear displacement at which dilation displacement is zero (δ h,δ v = 0 ) were digitized from the curves.…”

Section: Monotonic Direct Shear Test Database (Mdst)mentioning

confidence: 96%

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Constitutive model for rock fractures: Revisiting Barton's empirical model

Asadollahi

Tonon

2010

Engineering Geology

122

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Section: Modified Barton's Modelmentioning

confidence: 93%

Section: Monotonic Direct Shear Test Database (Mdst)mentioning

confidence: 96%

Constitutive model for rock fractures: Revisiting Barton's empirical model

Asadollahi

Tonon

2010

Engineering Geology

122

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“…The coupled shear-flow tests show that the flow rate of single fractures decreases nonlinearly with the increment of loading stress/displacement due to the increasing fracture closure (Goodman 1976;Yoshinaka and Yamabe 1986;PyrakNolte and Morris 2000). Based on the normal loading experiments on fractures (Iwai 1976;Bandis et al 1983), Baghbanan and Jing (2008) assumed that the ratio of the maximum fracture closure to the initial aperture is 0.9, and derived a function to link the normal stiffness of each fracture to its normal stress as…”

Section: Permeability and Boundary Stressmentioning

confidence: 96%

Review: Mathematical expressions for estimating equivalent permeability of rock fracture networks

et al. 2016

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Fracture networks play a more significant role in conducting fluid flow and solute transport in fractured rock masses, comparing with that of the rock matrix. Accurate estimation of the permeability of fracture networks would help researchers and engineers better assess the performance of projects associated with fluid flow in fractured rock masses. This study provides a review of previous works that have focused on the estimation of equivalent permeability of twodimensional (2-D) discrete fracture networks (DFNs) considering the influences of geometric properties of fractured rock masses. Mathematical expressions for the effects of nine important parameters that significantly impact on the equivalent permeability of DFNs are summarized, including (1) fracturelength distribution, (2) aperture distribution, (3) fracture surface roughness, (4) fracture dead-end, (5) number of intersections, (6) hydraulic gradient, (7) boundary stress, (8) anisotropy, and (9) scale. Recent developments of 3-D fracture networks are briefly reviewed to underline the importance of utilizing 3-D models in future research.

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“…In addition, fracture stiffness parameters are assumed based on the values of the Young's modulus of the intact rock, and the fracture smoothness. Stress-stain curves from the different fracture orientation are obtained from the elastoplastic rock mass model, and then compared to the experimental results collected by Yoshinaka and Yamabe (1986). By changing of the smoothness and orientation of fracture, different stressstrain curve are yielded and are summarized as in below Fig.…”

Section: Elasto-plastic Behavior Of Fractured Rock Massesmentioning

confidence: 99%

Training and Research on Probabilistic Hydro-Thermo-Mechanical Modeling of Carbon Dioxide Geological Sequestration in Fractured Porous Rocks

Gutierrez¹

2013

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Colorado School of Mines conducted research and training in the development and validation of an advanced CO 2 GS (Geological Sequestration) probabilistic simulation and risk assessment model. CO 2 GS simulation and risk assessment is used to develop advanced numerical simulation models of the subsurface to forecast CO 2 behavior and transport; optimize site operational practices; ensure site safety; and refine site monitoring, verification, and accounting efforts. As simulation models are refined with new data, the uncertainty surrounding the identified risks decrease, thereby providing more accurate risk assessment. The models considered the full coupling of multiple physical processes (geomechanical and fluid flow) and describe the effects of stochastic hydro-mechanical (H-M) parameters on the modeling of CO 2 flow and transport in fractured porous rocks. Graduate students were involved in the development and validation of the model that can be used to predict the fate, movement, and storage of CO 2 in subsurface formations, and to evaluate the risk of potential leakage to the atmosphere and underground aquifers. The main major contributions from the project include the development of: 1) an improved procedure to rigorously couple the simulations of hydro-thermomechanical (H-M) processes involved in CO 2 GS; 2) models for the hydro-mechanical behavior of fractured porous rocks with random fracture patterns; and 3) probabilistic methods to account for the effects of stochastic fluid flow and geomechanical properties on flow, transport, storage and leakage associated with CO 2 GS. The research project provided the means to educate and train graduate students in the science and technology of CO 2 GS, with a focus on geologic storage. Specifically, the training included the investigation of an advanced CO 2 GS simulation and risk assessment model that can be used to predict the fate, movement, and storage of CO 2 in underground formations, and the evaluation of the risk of potential CO 2 leakage to the atmosphere and underground aquifers.Page 5 BACKGROUND AND MOTIVATION IntroductionWith the increasing emission of greenhouse gases in the atmosphere, their reduction has become of paramount importance. Carbon capture and sequestration in appropriate geologic formations (saline aquifers, coal seams, and oil and gas reservoirs) are one of the promising methods to reduce the release of greenhouse gases in the atmosphere. However, there is still much work needed to be done to better account for the processes involved of CO 2 geological sequestration. Chief among these is the need to understand and predict the fate, movement, transport, storativity and potential leakage of CO 2 injected in sequestration reservoirs. Numerical models can help improve this understanding and can play significant roles in planning, design and management of CO 2 geological sequestration projects.The development and use of numerical models to CO 2 geological sequestration have many challenges. Chief among these is that CO 2 geological s...

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3. Joint stiffness and the deformation behaviour of discontinuous rock

Cited by 100 publications

References 5 publications

Constitutive model for rock fractures: Revisiting Barton's empirical model

Constitutive model for rock fractures: Revisiting Barton's empirical model

Review: Mathematical expressions for estimating equivalent permeability of rock fracture networks

Training and Research on Probabilistic Hydro-Thermo-Mechanical Modeling of Carbon Dioxide Geological Sequestration in Fractured Porous Rocks

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