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Geomechanics and Engineering Volume 34, Number 5, September10 2023 , pages 577-595 DOI: https://doi.org/10.12989/gae.2023.34.5.577 |
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Discrete element numerical simulation of dynamic strength characteristics of expanded polystyrene particles in lightweight soil |
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Wei Zhou, Tian-shun Hou, Yan Yang, Yu-xin Niu, Ya-sheng Luo and Cheng Yang
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| Abstract | ||
| A dynamic triaxial discrete element numerical model of lightweight soil was established using the discrete element method to study the microscopic mechanism of expanded polystyrene (EPS) particles in the soil under cyclic loading. The microscopic parameters of the discrete element model of the lightweight soil were calibrated depending on the dynamic triaxial test hysteresis curves. Based on the calibration results, the effects of the EPS particles volume ratio and amplitude on the contact force, displacement field, and velocity field of the lightweight soil under different accumulated strains were studied. The results showed that the hysteresis curves of lightweight soil exhibit nonlinearity, hysteresis, and strain accumulation. The strain accumulated in remolded soil is mainly tensile strain, and that in lightweight soil is mainly compressive strain. As the volume ratio of EPS particles increased, the contact force first increased and then decreased, and the displacement and velocity of the particles increased accordingly. With an increase in amplitude, the dynamic stress of the particle system increased, and the accumulation rate of the dynamic strain of the samples also increased. At 5% compressive strain, the contact force of the particles changed significantly and the number of particles deflected in the direction of velocity also increased considerably. These results indicated that the cemented structure of the lightweight soil began to fail at a compressive strain of 5%. Thus, a compressive strain of 5% is more reasonable than the dynamic strength failure standard of lightweight soil. | ||
| Key Words | ||
| cyclic load; discrete element method; dynamic triaxial test; lightweight soil; microscopic mechanism | ||
| Address | ||
| Wei Zhou, Tian-shun Hou, Yan Yang, Yu-xin Niu and Ya-sheng Luo: College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China Cheng Yang: Hanjiang to Weihe River Valley Water Diversion Project Construction Co., Ltd., Shaanxi Province, Xi'an 710011, Shaanxi, China | ||