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Abstract Aiming at the defects that the Cam-clay model cannot reflect the mechanics and strength characteristics of the remolded clay，based on the test research，the critical state line is improved. Through the undrained triaxial test，it is found that the critical state line of the remolded unsaturated clay has a shape of hyperbola. Therefore，the improved Cam-clay model is established based on the combination of hyperbolic critical state and the traditional Cam-clay model，and its secondary development is carried out in FLAC3D program. At the same time，Newton-Simpson iterative method is used to improve the relatively complex algorithm for plastic factor in FLAC3D. Finally，three axis numerical simulation tests on soil samples with different compactness are carried out using the improved Cam-clay model. The results show that，the mechanics characteristics of remolded unsaturated soil can be well reflected by the improved Cam-clay model；and the improved algorithm has higher precision and better performance.
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Received: 20 May 2013
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2013, Vol. 32 
