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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2020  >  20(4): 120-133
XU Jiang-bo, WANG Yuan-zhi, LUO Yong-zhen, YAN Zhang-gen, ZHANG Liu-jun, YIN Li-hua, YANG Xiao-hua, QIU You-qiang, LAN Heng-xing. Triaxial shear mechanical properties of reinforced foam lightweight soil[J]. Journal of Traffic and Transportation Engineering, 2020, 20(4): 120-133. doi: 10.19818/j.cnki.1671-1637.2020.04.009
Citation: XU Jiang-bo, WANG Yuan-zhi, LUO Yong-zhen, YAN Zhang-gen, ZHANG Liu-jun, YIN Li-hua, YANG Xiao-hua, QIU You-qiang, LAN Heng-xing. Triaxial shear mechanical properties of reinforced foam lightweight soil[J]. Journal of Traffic and Transportation Engineering, 2020, 20(4): 120-133. doi: 10.19818/j.cnki.1671-1637.2020.04.009
shu

Triaxial shear mechanical properties of reinforced foam lightweight soil

doi: 10.19818/j.cnki.1671-1637.2020.04.009
  • 1.

    Highway School, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    CCCC First Highway Consultants Co., Ltd., Xi'an 710075, Shaanxi, China

  • 3.

    Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China

Funds:

National Natural Science Foundation of China 41790443

National Natural Science Foundation of China 41927806

National Key Research and Development Program of China 2016YFC0802203

Fundamental Research Funds for the Central Universities 300102219213

Key Research and Development Program of Shaanxi Province 2018ZDXM-SF-024

Natural Science Foundation of Shaanxi Province 2018JQ5001

Natural Science Foundation of Shaanxi Province 2019JQ-218

Science and Technology Project of Qinghai Province 2019-ZJ-7050

More Information
  • Author Bio:

    XU Jiang-bo(1985-), male, associate professor, PhD, xujiangbo@yeah.net

  • Received Date: 2020-02-19
  • Publish Date: 2020-04-25
    Abstract
  • Through the triaxial shear test, the shear mechanical properties of polypropylene fiber reinforced foam lightweight soil under different reinforcement ratios and confining pressures were compared. The relationships between the strength parameters of the reinforced lightweight foamed soil and the reinforcement rate and confining pressure were investigated. The crack propagation law of reinforced lightweight foamed soil was obtained, and the stress-strain full curve equation was established. The constitutive equations for the strength parameters of foam lightweight soil in terms of reinforcement ratio and confining pressure were proposed. The experimental results with different reinforcement ratios were analyzed through the data normalization. The stress-strain full curve equation of reinforced foam lightweight soil was obtained. The functional relationships between the parameters of the curve equation and the two variables(reinforcement rate and confining pressure) were obtained. Analysis result shows that the triaxial shear strength and cohesion of reinforced foamed lightweight soil emerge a trend that increases first and then decreases with the increase of the reinforcement rate, and reach the peak values when the reinforcement rate reaches 0.75%. While the reinforcement ratio has limited influence on the internal friction angle of reinforced foam lightweight soil, which indicates that the function of fiber affects the strength of reinforced foam lightweight soil by changing the cohesive force of the material. The strength reduction rate presents an obvious descend trend with the increase of the reinforcement rate, at most, it decreases from about 40% to about 10%, and then keeps stable. When the reinforcement rate is kept constant, the ultimate strength and residual strength of reinforced foamed lightweight soil present an increase trend with the confining pressure. Through analyzing the volume crack curve, it is found that the reinforced lightweight foamed soil is mainly subjected to four stages when it is damaged: compression, cracking, crack restriction because of the fiber tension, and pulling out of fiber due to the large crack extension. When the reinforced foam lightweight soil reaches the yield stage by two crack development processes: the stable and unstable growth of crack. Due to the lack of reinforcement, the failure type of foam lightweight soil belongs to brittle failure, hence, there is no instability growth stage of crack.

     

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