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| Calculation and analysis of elasto-plastic dynamic response of fluid-saturated porous media based on explicit finite element method |
| Received:July 20, 2009 Revised:January 20, 2010 |
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| DOI：10.7511/jslx201103021 |
| KeyWord:fluid-saturated porous media elasto-plastic dynamic response time-domain explicit finite element method dynamic constitutive model based on SMP failure criterion |
| Author | Institution |
| 李亮 |
北京工业大学 城市与工程安全减灾省部共建教育部重点实验室, 北京 |
| 杜修力 |
北京工业大学 城市与工程安全减灾省部共建教育部重点实验室, 北京 |
| 赵成刚 |
北京交通大学 土木建筑工程学院, 北京 |
| 翟威 |
北京工业大学 城市与工程安全减灾省部共建教育部重点实验室, 北京 |
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| Abstract: |
| In this paper, the incremental elasto-plastic wave equations of fluid-saturated porous media are solved by the time-domain explicit finite element method based on explicit step-by-step integral format. The elasto-plastic dynamic constitutive model baesd on SMP failure criterion is adopted to describe the dynamic property of fluid-saturated porous media. Then, the elasto-plastic dynamic response of fluid-saturated porous media under input earthquake wave is calculated and analyzed with the method and constitutive model mentioned above, and calculating results are compared with the corresponding results of elastic dynamic response. At last, the effect of constitutive model parameter value on the calculating results of elasto-plastic dynamic response of fluid-saturated porous media is studied. Calculating results show that both the peak value and the figure of time history of elasto-plastic displacement has obvious difference to those of elastic displacement; the plastic potential parameter in the constitutive model adopted in this paper has important influence on the calculating results of elasto-plastic displacement, but the ratio of hardening parameters in initial loading and unloading stage to reloading stage will only affect the amplitude of plastic deformation appears by the end of dynamic response. In the meanwhile, numerical calculations carried out in this paper indicate that the time-domain explicit finite element method is effective for the calculation and analysis of the elasto-plastic dynamic response of fluid-saturated porous media. |