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Geomechanics and Engineering
  Volume 22, Number 3, August10 2020, pages 237-244

Hydro-mechanical behavior of compacted silt over a wide suction range
Bo Chen, Xiuheng Ding, You Gao, De\'an Sun and Haihao Yu

    To achieve a wide suction range, the low suction was imposed on compacted silt specimens by the axis translation technique and the high suction was imposed by the vapor equilibrium technique with saturated salt solutions. Firstly, the results of soil water retention tests on compacted silt show that the soil water retention curves in terms of gravimetric water content versus suction relation are independent of the dry density or void ratio in a high suction range. Therefore, triaxial tests on compacted silt with constant water content at high suctions can be considered as that with constant suction. Secondly, the results of triaxial shear tests on unsaturated compacted silt with the initial void ratio of about 0.75 show a strain-hardening behavior with a slightly shear contraction and then strain-softening behavior with an obviously dilation. As the imposed suction increases, the shear strength increases up to a peak value and then decreases when the suction is beyond a special value corresponding to the peak shear strength. The residual strength increases to fair value and those at high suctions are almost independent of imposed suctions. In addition, the contribution of suction to the strength of compacted silt would not diminish even in a high suction range.
Key Words
    unsaturated soil; soil water retention behavior; triaxial test; high suction
Bo Chen and De\'an Sun: College of Civil Engineering and Architecture, Quzhou University, 78 Jiuhua Road, Quzhou 324000, China

Xiuheng Ding: Shanghai Civil Engineering Co. LTD of CREC, 237 Yangjiangsan Road, Shanghai 200436, China

You Gao: School of Civil and Environmental Engineering, Ningbo University, 818 Fenghua Road, Ningbo 315211, China

Haihao Yu:Laboratory of Geomechnics and Geotechnical Engineering, Guilin University of Technology, 12 Jian Gan Road, Guilin, 541004, China

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