Elastoplastic Model of Sand Under Complex Loading
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The unified hardening model for overconsolidated clay is extended to the cyclic model considering the stress–strain relationship for sands by adopting the rotational hardening rule. The equations for the normal consolidated line and critical state line are revised in the e – ln p space to describe the breakage behavior of gravel sands under high pressures. The power function is used to define the above equations. The model features the following characteristics: (1) equations for the above lines are redefined in the e – ln p space; (2) potential strength is revised by the Hvorslev line containing the power parameter; (3) cyclic behavior of sands is described by the evolutionary rule of current yield surface and rotational hardening rule; (4) generalized cyclic model is realized using the transformed stress method based on the spatially mobilized plane criterion. Simulation results show that the breakage and cyclic loading behavior of gravel sands are adequately described.
Keywordssands rotational hardening transformed stress method cyclic loading
This study was supported by the National Natural Science Foundation of China for young scholars (Grant No. 11402260).
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