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http://dx.doi.org/10.12989/sem.2019.69.2.221

Shear behavior of non-persistent joints in concrete and gypsum specimens using combined experimental and numerical approaches  

Haeri, Hadi (MOE Key Laboratory of Deep Underground Science and Engineering, School of Architecture and Environment, Sichuan University)
Sarfarazi, V. (Department of Mining Engineering, Hamedan University of Technology)
Zhu, Zheming (MOE Key Laboratory of Deep Underground Science and Engineering, School of Architecture and Environment, Sichuan University)
Hokmabadi, N. Nohekhan (Geology Department, Yazd University)
Moshrefifar, MR. (Geology Department, Yazd University)
Hedayat, A. (Department of Civil and Environmental Engineering, Colorado School of Mines)
Publication Information
Structural Engineering and Mechanics / v.69, no.2, 2019 , pp. 221-230 More about this Journal
Abstract
In this paper, shear behavior of non-persistent joint surrounded in concrete and gypsum layers has been investigated using experimental test and numerical simulation. Two types of mixture were prepared for this study. The first type consists of water and gypsum that were mixed with a ratio of water/gypsum of 0.6. The second type of mixture, water, sand and cement were mixed with a ratio of 27%, 33% and 40% by weight. Shear behavior of a non-persistent joint embedded in these specimens is studied. Physical models consisting of two edge concrete layers with dimensions of 160 mm by 130 mm by 60 mm and one internal gypsum layer with the dimension of 16 mm by 13 mm by 6 mm were made. Two horizontal edge joints were embedded in concrete beams and one angled joint was created in gypsum layer. Several analyses with joints with angles of $0^{\circ}$, $30^{\circ}$, and $60^{\circ}$ degree were conducted. The central fault places in 3 different positions. Along the edge joints, 1.5 cm vertically far from the edge joint face and 3 cm vertically far from the edge joint face. All samples were tested in compression using a universal loading machine and the shear load was induced because of the specimen geometry. Concurrent with the experiments, the extended finite element method (XFEM) was employed to analyze the fracture processes occurring in a non-persistent joint embedded in concrete and gypsum layers using Abaqus, a finite element software platform. The failure pattern of non-persistent cracks (faults) was found to be affected mostly by the central crack and its configuration and the shear strength was found to be related to the failure pattern. Comparison between experimental and corresponding numerical results showed a great agreement. XFEM was found as a capable tool for investigating the fracturing mechanism of rock specimens with non-persistent joint.
Keywords
non-persistent joints; uniaxial test; shear behaviour; experimental and numerical approaches;
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Times Cited By KSCI : 13  (Citation Analysis)
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