桩–筏–土体系的地震软化行为及 ABAQUS模拟研究

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Abstract By conducting dynamic centrifuge tests on the pile-raft-clay system，that soil softening will be taken place in both near field and far field clay in a great degree is investigated，which are manifested as an increase in the resonance periods of clay layers with the level of shaking and successive earthquakes，while this is not the case for the pile-raft foundation since resonance periods of raft and bending moment envelopes of the pile are hardly affected by earthquake loadings. Furthermore，pile-raft dynamic behavior is hardly affected by the stiffness degradation of surrounding clay and could keep stable in successive earthquakes process. Then centrifuge tests are back-analyzed by using ABAQUS 6.9. The results show that，which are conducted using Hypoelastic model embedded in ABAQUS and a developed constitutive relationship，gave reasonably good agreement with the experimental observations. The ability of the numerical model to reasonably replicate the centrifuge tests suggested that ABAQUS simulation can be a powerful method to analyze the dynamic behavior of pile-raft-clay system under different conditions which can not be considered in the centrifuge experiments. Moreover，in ABAQUS analysis，the soil model with or without considering degradation can give almost similar results，but calculation using Hypoelastic soil model showed timesaving and speedy advantages.

Key words： foundation pit earthquake pile-raft foundation soft clay interaction soft softening resonance period bending moment

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	MA Kang1
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	XU Qiang 2

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MA Kang1,2,XU Qiang 2. study of seismic softening behavior and ABAQUS simulation of pile-raft-clay system[J]. , 2012, 31(S1): 3254-3263.

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/IS1/3254

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