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Geomechanics and Engineering
  Volume 11, Number 5, November 2016 , pages 713-723

Shear wave velocity of sands subject to large strain triaxial loading
Supot Teachavorasinskun and Pulpong Pongvithayapanu

    Shear wave velocities of three selected sandy soils subject to drained triaxial compression test were continuously measured using the bender elements. The shear wave velocity during isotropic compression, as widely recognized, increased as confining pressure increased and they were correlated well. However, during drained shearing, the mean effective stress could no further provide a suitable correlation. The shear wave velocity during this stage was almost constant with respect to the mean effective stress. The vertical stress was found to be more favorable at this stage (since confining stress was kept constant). When sample was attained its peak stress, the shear wave velocity reduced and deviated from the previously existed trend line. This was probably caused by the non-uniformity induced by the formation of shear band. Subsequently, void ratios computed based on external measurements could not provide reasonable fitting to the initial stage of post-peak shear wave velocity. At very large strain levels after shear band formation, the digital images revealed that sample may internally re-arrange itself to be in a more uniform loose stage. This final stage void ratio estimated based on the proposed correlation derived during pre-peak state was close to the value of the maximum void ratio.
Key Words
    shear wave velocity; shear band; triaxial compression test; sandy soil
(1) Supot Teachavorasinskun:
Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, Thailand;
(2) Pulpong Pongvithayapanu:
Department of Civil Engineering, Faculty of Engineering at Si Racha, Kasetsart University, Chonburi, Thailand.

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