Percolation model for dilatancy-induced permeability of the excavation damaged zone in rock salt

Alkan, Hakan

doi:10.1016/j.ijrmms.2008.08.002

Cited by 91 publications

(47 citation statements)

References 33 publications

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“…These results are summarized in Figs.4−6. Example problems are selected to include the following issues: (1) comparisons are made between the present results and the previously published solutions, and (2) effects of seepage force and strain softening on the displacement and stress of circular opening are studied. Fig.4 illustrates the three curves of radial stress distributions in three different conditions: (1) taking account of seepage and strain softening, (2) only taking account of strain softening and (3) without considering strain softening and seepage.…”

Section: Resultsmentioning

confidence: 99%

Influences of strain softening and seepage on elastic and plastic solutions of circular openings in nonlinear rock masses

Yang

Huang

2010

J. Cent. South Univ. Technol.

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Considering the influence of strain softening, the solutions of stress, displacement, plastic softening region radius and plastic residual region radius were derived for circular openings in nonlinear rock masses subjected to seepage. The radial stress distribution curve, ground reaction curve, and relation curve between plastic softening region radius and supporting force in three different conditions were drawn respectively. From the comparisons among these results for different conditions, it is found that when the supporting force is the same, the displacement of tunnel wall considering both seepage and strain softening is 85.71% greater than that only considering seepage. The increase values of radial displacement at 0.95 m and plastic softening region radius at 6.6 m show that the seepage and strain softening have the most unfavorable effects on circular opening stability in strain softening rock masses.

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Section: Resultsmentioning

confidence: 99%

Influences of strain softening and seepage on elastic and plastic solutions of circular openings in nonlinear rock masses

Yang

Huang

2010

J. Cent. South Univ. Technol.

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“…MATLAB software was used to calculate the white area and the ratio of the total area in the binary image mentioned above, taken into Equation (5). Then the relation between the temperature and the damage to the rock salt surface could be obtained, as shown in Table 1.…”

Section: Quantitative Analysis Of the Relation Between The Expansion mentioning

confidence: 99%

“…The mechanical behavior of natural rock salt has been investigated experimentally, and it was found that rock salt has good creep, self-healing and low permeability properties [5][6][7][8]. This makes it a good candidate for storage of gas, crude oil and radioactive waste.…”

Section: Introductionmentioning

confidence: 99%

The Thermal Damage Properties of Mudstone, Gypsum and Rock Salt from Yingcheng, Hubei, China

et al. 2015

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Abstract:The impacts of temperature on the surface thermal damage of rock salt, gypsum and mudstone from the Yingcheng salt mine, China were investigated by the surface crack growth and propagation tests at different temperatures. We found that: (a) high temperature could strengthen the rock salt molecular thermal motion and weaken the cohesion among the rock salt grains, so that the grain boundaries were more prone to slip and thus develop into cracks; (b) high temperature could make the water molecules evaporate from rock specimens, which should change the physical properties of gypsum and mudstone; and (c) high temperature had a significant effect on the interface between rock salt and gypsum and mudstone, therefore it should be easy to produce cracks with white or light yellow cumulate powder here. The surface crack growth and propagation of the rock salt, gypsum and mudstone have a positive correlation with the temperature by stereo microscope and the method of binary images, which could observe the surface thermal damage properties. Finally, the fractal dimension of the rock salt surface cracks was calculated based on fractal theory, and the evolution of the surface thermal damage was found from 50 to 260 °C.

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“…They found the contribution due to microcracks was more significant, when analyzing WIPP data. Alkan (2009) developed an updated relationship between permeability and dilatancy, based upon percolation theory and the cubic law. Cook (1987) points to studies where the flow in fractured rocks has shown to deviate from cubic law predictions at low flowrates and small apertures (≤ 10 µm).…”

Section: Salt Permeability As a Function Of Mechanical Propertiesmentioning

confidence: 99%

Brine flow in heated geologic salt.

Kuhlman¹,

Malama²

2013

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This report is a summary of the physical processes, primary governing equations, solution approaches, and historic testing related to brine migration in geologic salt. Although most information presented in this report is not new, we synthesize a large amount of material scattered across dozens of laboratory reports, journal papers, conference proceedings, and textbooks.We present a mathematical description of the governing brine flow mechanisms in geologic salt. We outline the general coupled thermal, multi-phase hydrologic, and mechanical processes. We derive these processes' governing equations, which can be used to predict brine flow. These equations are valid under a wide variety of conditions applicable to radioactive waste disposal in rooms and boreholes excavated into geologic salt. 3We focus on the development of the governing equations with the intent to solve them analytically or in a simplified numerical manner, although we briefly summarize some available fully coupled three-dimensional numerical models and some historic modeling results. We non-dimensionalize the governing equations, and make some statements about importance of terms in the governing equations for physically plausible ranges of material property values.We summarize both in situ and laboratory brine migration testing in intact geologic salt, primarily focusing on tests performed under heated conditions relevant to high-level waste disposal. Supporting material is presented in appendices on relevant aspects of laboratory water content determination for bedded salt, the nature and evolution of the disturbed rock zone, and geologic salt permeability testing.In the final summary chapter, we provide a narrative description of the processes controlling both isothermal and heated brine inflow to excavations in geologic salt. Based upon our review, we recommend several potential in situ and laboratory tests, which could be conducted to increase understanding, parametrize numerical models, and confirm the importance of competing physical processes.4

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Percolation model for dilatancy-induced permeability of the excavation damaged zone in rock salt

Cited by 91 publications

References 33 publications

Influences of strain softening and seepage on elastic and plastic solutions of circular openings in nonlinear rock masses

Influences of strain softening and seepage on elastic and plastic solutions of circular openings in nonlinear rock masses

The Thermal Damage Properties of Mudstone, Gypsum and Rock Salt from Yingcheng, Hubei, China

Brine flow in heated geologic salt.

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