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Triaxial shear mechanical properties of reinforced foam lightweight soil(PDF)


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Triaxial shear mechanical properties of reinforced foam lightweight soil
XU Jiang-bo1 WANG Yuan-zhi1 LUO Yong-zhen1 YAN Chang-gen1 ZHANG Liu-jun2 YIN Li-hua2 YANG Xiao-hua1 QIU You-qiang2 LAN Heng-xing3
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
soft soil subgrade reinforced foam lightweight soil triaxial shear test stress-strain relation crack closure model residual strength
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. 9 tabs, 14 figs, 30 refs.


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Last Update: 2020-08-20