VISCO-ELASTO-PLASTIC CONSTITUTIVE MODEL FOR ROCKFILL CONSIDERING PARTICLE CRUSHING
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摘要: 通过对等向压缩条件下加载速率对堆石料应力-应变特性的影响规律的分析,提出与时间相关的应力-应变关系式。结合堆石料颗粒破碎的研究成果,将与时间相关的本构关系由等向压缩推广到剪切,从而建立能够考虑颗粒破碎和时间效应综合影响的本构模型。对试验数据的预测结果表明:新模型不仅能够合理地考虑加载过程中颗粒破碎及时间因素对变形的影响,而且还能较好地描述荷载稳定时变形随时间的发展规律。Abstract: The influence of loading rate on stress-strain behaviors of rockfill under isotropic compression condition was analyzed. Based on the research achievements of particle crushing for rockfill,the time dependent constitutive relationship was generalized from isotropic to shearing condition,and a constitutive model considering particle crushing and time-effect was proposed further. The comparison of predicted and tested results indicate that the proposed model can not only consider the influence of particle crushing and time-effect on deformation while loading reasonably,but also describe well the deformation with time increasing during holding the load.
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Key words:
- rockfill /
- particle crushing /
- loading rate /
- time-effect /
- constitutive model
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