Particle Flow Simulation Study of Damage Evolution in Expansive Slurry–Fractured Rock Mass Composites under Direct Shear Conditions
Publication: International Journal of Geomechanics
Volume 24, Issue 6
Abstract
To study the reinforcement mechanism of expansive slurry from a mesoscopic perspective, shear simulation tests were conducted on a slurry–fractured rock mass composite using PFC2D (version 5.00.35). The tests analyzed the distribution of cracks, the process of damage evolution, the distribution characteristics of intergranular contact forces, and the displacement of particles. The results indicate that (1) the volume expansion of the expansive slurry compressed the rock mass, causing the slurry particles to penetrate the pores of the rock particles. This process increased the contact area between the slurry and the rock mass, improved the friction, and intensified the degree of interlocking between the slurry and the rock mass, thus improving the bonding between them. (2) Both composite rock masses exhibited similar macroscopic damage patterns consistent with the laboratory tests. During shear tests, both composites experienced four stages of crack development: crack initiation, slow crack development, rapid crack development, and stable crack number. (3) The expansion stress, along with its reaction force and friction force, increased the integrity of the composite rock mass, reducing the differences in particle displacement direction and velocity. This led to improved internal deformation coordination within the composite rock mass, resulting in fewer cracks during shear tests.
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Data Availability Statement
All data and models that support the findings of this study are available from the corresponding author upon reasonable request and the code of the results of this study is unavailable.
Acknowledgments
The authors acknowledge the support from the National Natural Science Foundation of China (No. 51804224), the Key R&D Projects in Hubei Province (No. 2020BCA082), and “The 14th Five Year Plan” Hubei Provincial advantaged characteristic disciplines (groups) project of Wuhan University of Science and Technology (No. A0303). The authors also thank the experimental support provided by Prof. Gang Zhao and the Fund of the Key Research and Development Program of Hubei Province (No. 2021BAA202).
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Published In
International Journal of Geomechanics
Volume 24 • Issue 6 • June 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jul 19, 2023
Accepted: Dec 21, 2023
Published online: Apr 4, 2024
Published in print: Jun 1, 2024
Discussion open until: Sep 4, 2024
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