Shear Mechanical Properties of the Interphase between Soil–Rock Mixtures and Benched Bedrock Slope Surfaces
Publication: International Journal of Geomechanics
Volume 22, Issue 5
Abstract
A series of benched excavations are typically carried out on bedrock slope surfaces to improve the stability of soil–rock mixtures (SRMs) on the fill slopes. In this paper, the shear characteristics and micromechanisms of SRMs–bedrock interphases were studied by means of large direct shear tests and discrete-element numerical simulation. In the process, this study also investigated the influences of rock block content and interface roughness by combining the direct shear test and discrete-element method (DEM) numerical simulation results. This showed that the samples exhibit obvious bulk shrinkage during shearing. As the rock block content increases, fluctuations in the postpeak shear stress–displacement curves become more obvious. Cohesion is more sensitive to roughness, while internal friction angle is insensitive to roughness. Also, the internal friction angle is very sensitive to rock block content. Moreover, the shear strength and cohesion of the interphase increase along with the superficial roughness, demonstrating a quadratic correlation with rock block content. However, this increase in roughness also increases the fracturing of rock blocks in the interphase. Within a certain interval, the shear strength of SRMs–bedrock interphases can be estimated according to a fitted empirical formula.
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Acknowledgments
The research described in this paper was financially supported by the National Key R&D Program of China (Grant No. 2018YFC1504802), the National Natural Science Foundation of China (Grant No. 41772306), and the Fundamental Research Funds for the Central Universities (Project No. 2019CDCG0013).
Notation
The following symbols are used in this paper:
- c
- cohesion of SRMs–bedrock interphase;
- h
- height of the step;
- L
- length of the step;
- p
- axial pressure;
- R
- distance between the step peak and the valley;
- S
- distance between the two peaks of steps;
- Y
- roughness of limestone specimens;
- α
- bevel angle of step slope is defined as;
- γ
- roughness of the contact surface and valley; and
- ω
- rock block content of SRMs.
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Published In
International Journal of Geomechanics
Volume 22 • Issue 5 • May 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 9, 2021
Accepted: Dec 8, 2021
Published online: Mar 7, 2022
Published in print: May 1, 2022
Discussion open until: Aug 7, 2022
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