 2015, Vol. 34 Issue (12): 2542-2549 DOI: ELASTOPLASTIC ACCUMULATION MODEL FOR PREDICTING SOIL PLASTIC ENVELOPE DUE TO HIGH-CYCLIC LOADING |
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| ELASTOPLASTIC ACCUMULATION MODEL FOR PREDICTING SOIL PLASTIC ENVELOPE DUE TO HIGH-CYCLIC LOADING |
| JIA Pengfei1，KONG Lingwei2 |
(1. State Key Laboratory of Continental Dynamics，Department of Geology，Northwest University，Xi?an，Shaanxi 710069，China；2. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，
Chinese Academy of Sciences，Wuhan，Hubei 430071，China) |
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Abstract At present，there is no comprehensive theoretical framework that not only can describe reasonably the behaviour of normal cyclic deformation of soil，but is also suitable for its calculation and prediction at high-cyclic conditions，i.e.，at large numbers of load cycles. In this paper，an elastoplastic accumulation model was developed which incorporates the characteristics of high-cyclic loading and allows a free selection of the integration step size. This model adopts the theoretical framework of Perzyna viscoplasticity and uses an accumulated plastic strain increment over a number of load cycles as a response envelope. Based on the general principles of critical state soil mechanics，the accumulated plastic volumetric strain was used as the hardening parameter to describe the size of the plastic strain accumulation using a power law. A factor representing the influence of average stress was introduced to describe the strain hardening process. In addition，the principles of the modified Cam-clay model at the average stress state were used to describe the direction of the plastic strain accumulation. The developed model was calibrated with data from cyclic triaxial tests. It was found that the model can describe with a sufficient level of accuracy the plastic strain accumulation at low stress levels. However，there were some discrepancies between the model predictions and experimental results at high stress levels，especially when the average stress level was close to or higher than the critical state values.
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