S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Energy Systems Engineering (에너지시스템공학부) Journal Papers (저널논문_에너지시스템공학부)
Numerical method for the determination of contact areas of a rock joint under normal and shear loads
- Park, Jung-Wook; Song, Jae-Joon
- Issue Date
- INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES Vol.58 No.1, pp. 8-22
- A numerical method to determine the contact areas of a rock joint under normal and shear loads is
proposed. The method requires only three-dimensional surface coordinates at the initial stage before
shearing, while some disparate materials are inserted between the joint surfaces or particular
equipments are adopted for measurement of the contact areas during the test in other conventional
methods. The joint surface is modeled as a group of triangular planes, and the contact condition of each
plane is examined by calculating the relative displacements of both surfaces from their initial locations.
To verify the method, a direct shear test on a rock joint was simulated using a bonded particle model in
a discrete element code. The locations of the contact areas observed in the simulation showed good
agreement with those determined using the proposed method. To characterize the roughness of the
joint surface including the contact area, the concept of ‘active and inactive micro-slope angle’ was
defined based on the apparent inclination of the triangular element to the shear direction. To apply
these techniques, the experimental results of shear tests on replicas of rock joints were analyzed for the
location, size and micro-slope angle of contact areas according to the following shearing stages: prepeak,
peak, post-peak and residual. The locations of the contact areas were closely correlated with the
distribution of the micro-slope angle, which indicates that the joint roughness should be qualified with
respect to the shear direction and the corresponding contact area. Additionally, the proposed method
was applied to estimation of the distribution of aperture size within a rock joint.
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