American Society of Civil Engineers


Simulation and Amelioration of Wu-Bauer Hypoplastic Constitutive Model under Dynamic Load


by Baolin Xiong, (Department of Civil Engineering, Shijiazhuang Railway Institute, Hebei, Shijiazhuang, 050043, People’s Republic of China E-mail: xiongbao77@126.com) and Chunjiao Lu, (Department of Architecture and Art Design, Shijiazhuang Railway Institute, Hebei, Shijiazhuang, 050043, People’s Republic of China E-mail: ruyan1978@126.com)

pp. 74-79, (doi:  http://dx.doi.org/10.1061/41049(356)12)

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Document type: Conference Proceeding Paper
Part of: Slope Stability, Retaining Walls, and Foundations: Selected Papers from the 2009 GeoHunan International Conference
Abstract: The stress-strain relation of sand can be modeled with Wu-Bauer hypoplastic constitutive model, in which the magnitude and direction of stress increment depend on not only the previous stress state, but also the magnitude and direction of current strain increment. The parameters of this model can be determined conveniently by simple triaxial test. Under static load Wu-Bauer hypoplastic constitutive model can well simulate strength and deformation of sand. But under dynamic load, the major shortcoming—ratcheting is produced in Wu-Bauer hypoplastic constitutive model. For eliminating ratcheting, Wu-Bauer hypoplastic model is ameliorated based on intergranular strain tensor. The new parameters in ameliorated model are determined by mode search method. Under cyclic load of oedometric compression and undrained dynamic triaxial, the mechanics features of sand are described by the ameliorated Wu-Bauer hypoplastic constitutive model. Preliminary result shows that stress-strain relation of sand under dynamic load can be well considered and ratcheting may be removed in the ameliorated Wu-Bauer hypoplastic constitutive model.


ASCE Subject Headings:
Simulation
Constitutive models
Dynamic loads
Elastoplasticity
Stress strain relations