Triaxial Axis Shear Mechanical Properties of Fiber-Reinforced Foamed Lightweight Soil
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Volume 33, Issue 4
Abstract
Fiber-reinforced foamed lightweight soil is a new type of material that is mixed with cement, foam, polypropylene fiber, and water, and has been applied in the reinforcement of soft soil subgrade. However, it has not yet formed a complete theoretical system. Currently, it is imperative to explore the fiber-reinforced foamed lightweight soil. In this paper, the shear strength characteristics of polypropylene fiber-reinforced foamed lightweight soil with different reinforcement ratios and confining pressures are compared using the global digital systems (GDS) triaxial shear test. It is found that the triaxial shear strength and cohesion first increases, then decreases with the increase of reinforcement ratio, the maximum of which occurs at 0.75% reinforcement rate. The internal friction angle of fiber-reinforced foamed lightweight soil is less affected by the reinforcement ratio. This indicates that the cohesive force of the material is the main factor that affects the strength of the polypropylene fiber-reinforced foamed lightweight soil. The strength reduction rate presents an obvious downward trend with the increase of the reinforcement rate. It reaches from about 40% to 10%, and keeps stable at 10%. From investigating the influence of reinforcement ratio and confining pressure on strength parameters, the research obtains the law of crack propagation of fiber-reinforced foamed lightweight soil and establishes the stress–strain relationship equation. The constitutive equations for the strength parameters of foamed lightweight soil in terms of reinforcement ratio and confining pressure are proposed. After normalizing the experimental data of different reinforcement ratios, the study obtains the stress–strain equation of fiber-reinforced foamed lightweight soil and variation of equation parameters with the influence of stiffening rate and confining pressure.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. Data from all figures and tables are available upon request.
Acknowledgments
This work was partially supported by National Natural Science Foundation of China (Nos. 41790443 and 41927806); National Key R&D Program of China (No. 2016YFC0802203-8); Fund of National–Local Joint Engineering Laboratory for Road Engineering and Disaster Prevention and Mitigation Technology in Mountainous Areas, Natural Science Foundation of Shaanxi Province (No. 2019JQ-218); Fundamental Research Funds for the Central Universities, CHD (No. 300102219213); Key Research and Development Program of Shaanxi (Nos. 2018ZDXM-SF-024, 2019ZDLSF05-07, and 2017ZDCXL-SF-03-01-01); and Natural Science Foundation of Qinghai Province (No. 2019-ZJ-7050).
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 4 • April 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Nov 7, 2019
Accepted: Aug 25, 2020
Published online: Jan 30, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 30, 2021
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