科研之友
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摘要
Conventional consolidation tests on reconstituted specimens of numerous natural soft clays show a decreasing of creep index C (alpha e) with increasing soil density. Based on all selected and conducted experimental results, a modified creep index C (alpha e)* defined in double logarithmic plane lge-lgt, was plotted for various clays, from which C (alpha e)* can be assumed as a constant for different soil densities. Then, the modified creep index was applied to a newly developed elastic viscoplastic model. In this way, the modified creep index C (alpha e)* can naturally take into account the nonlinear C (alpha e) revealing the influence of soil density in the soil assemblies without additional parameters. Finally, the enhanced model was incorporated into the finite element code ABAQUS and used to simulate a consolidation test and a test embankment. The improvement of simulations by the modified creep index was highlighted by comparing simulations using the conventional creep index C (alpha e).
