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Title: Time-dependent behavior of rock joints considering asperity degradation
Authors: Zhang, Qingzhao
Wu, Chuangzhou
Fei, Xunchang
Jang, Bo An
Liu, Dongqiao
Keywords: Engineering::Civil engineering
Issue Date: 2019
Source: Zhang, Q., Wu, C., Fei, X., Jang, B. A. & Liu, D. (2019). Time-dependent behavior of rock joints considering asperity degradation. Journal of Structural Geology, 121, 1-9.
Journal: Journal of Structural Geology
Abstract: The time-dependent behavior of rock joints, specifically creep and stress relaxation, govern the long-term stability of underground structures, but have not been fully understood. The effect of asperity degradation on the time-dependent behavior of rock joints is investigated in this test. Triangular synthetic rock joints with four asperity angles (θ = 0° 10° 30° and 45°) are tested for creep and stress relaxation. It is revealed that the failure mode of a rock joint during creep and stress relaxation shifts from surface sliding (θ = 0°) to a combination of surface sliding and asperity crushing (θ > 10°). Asperity crushing becomes more severe as θ increases. Consequently, a rougher rock joint with higher θ exhibits higher creep and stress relaxation rates due to more asperity crushing. For each θ the creep and stress relaxation rates both increase exponentially with increasing shear stress before the stable long-term strength is reached, suggesting a higher degree of asperity degradation as shear resistance mobilizes. Semi-empirical correlations are proposed to quantify the effects of asperity angles on creep and stress relaxation of rock joints at various shear stresses.
ISSN: 0191-8141
DOI: 10.1016/j.jsg.2019.01.004
Rights: © 2019 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles

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