Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (6): 1790-1798.doi: 10.13278/j.cnki.jjuese.201606202

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Practical Computation Method of Deformation with Water Content Increasing of Unsaturated Soil

Liu Lanlan1, Li Hongru2, Chang Qiuying1, Li Xiaole1, Wang Hongyu1, Zhao Chuanhai1   

  1. 1. School of Civil Engineering, Changchun Architecture & Civil Engineering College, Changchun 130607, China;
    2. School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, China
  • Received:2016-02-07 Online:2016-11-26 Published:2016-11-26
  • Supported by:
    Supported by National Natural Science Foundation of China(51479168)and Key Research Project of Jilin Provincial Department of Education ([2016] No.539)

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Abstract: The research of unsaturated soil mechanics cannot yet reach in practical application because of the difficulty in measuring suction. A new test method to measure suction is suggested in this paper, in which the actual suction is replaced by equivalent suction. The cell pressure in a certain degree of saturation is taken as the equivalent suction according to the principle of deformation equivalence and the stress-strain curves obtained by triaxial compression tests of saturated and unsaturated undisturbed soil. A nonlinear relationship formula between equivalent suction and degree of saturation is presented. Then, considering the influences of water contents on strength, a non-linear shear strength model and stress-strain model of unsaturated loess are developed. And the parameters of Dancun-Chang's model are obtained for unsaturated soils with different saturation degree. The deformation from presented model under the case of rain-seepage into unsaturated soil show that the maximum of suction and displacement occurs in place in flooding, in which the maximum degree of saturation is 95%, the maximum equivalent suction is 160 kPa, the maximum horizontal displacement and vertical displacement are 0.6 cm and 20.0 cm, respectively. The calculation results rationally reflect the distribution trend of unsaturated soil deformation.

Key words: unsaturated soils, equivalent suction, triaxial compression tests, equivalence of deformation, strength

CLC Number: 

  • P642.116
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