›› 2016, Vol. 37 ›› Issue (4): 1013-1022.doi: 10.16285/j.rsm.2016.04.014

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental studies of rotation angles of principal strain axes for wet sandy soil specimens under uniaxial compression

GU Lu1，WANG Xue-bin1, 2, 3，DU Ya-zhi1，FENG Wei-wu1   

  1. 1. College of Mechanics and Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, China; 2. Institute of Computational Mechanics, Liaoning Technical University, Fuxin, Liaoning 123000, China; 3. School of Mechanics and Architecture Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China
  • Received:2014-07-16 Online:2016-04-11 Published:2018-06-09
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (NSFC) (51374122), Program for Liaoning Scientific Research Public Welfare Foundation (GY2014-C-008), Research Fund for the Doctoral Program of Higher Education of China (RFDP) (20132121110006) and Program for Liaoning Excellent Talents in University (LNET) ( LR2015029).

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Abstract: Using the self-developed digital image correlation method based on the particle swarm optimization algorithm, the spatiotemporal distributions of rotation angles of principal strain axes for wet sandy soil specimens are investigated under uniaxial compression. Using the bicubic spline interpolation, the rotation angles of principal strain axes at any positions are obtained to study the evolution of the rotation angles of principal strain axes with the longitudinal strains before the occurrence of a shear band, at its center, in the vicinity and at both sides of the band. It is found that with the increase of longitudinal strain, the rotation angles of principal strain axes change from a scattered distribution to a stable one; and at last, its range in most regions is -10°-10°. After the occurrence of an apparent shear band at the late stage of strain-hardening, at the center of the band, the rotation angles of principal strain axes tend to be stable or descend slightly, within a range of -5°-5°, while those at both sides of the band still increase. At tip of the band, the evolution of the rotation angles of principal strain axes is complex.

Key words: sandy soil specimen, rotation of principal strain axes, shear band, spline interpolation, digital image correlation method

CLC Number: 

  • TU 454

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