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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。
By analyzing the influence of load rate on the stress-strain behavior of rockfill under the condition of isotropic compression, the time-dependent stress-strain relation is proposed. Based on the research results of the crushing of rockfill materials, the constitutive relation related to time is generalized from isotropic compression to shear, so as to establish a constitutive model that can consider the combined effect of particle crushing and time effect. The test results show that the new model not only can reasonably consider the influence of particle breakage and time on the deformation during loading, but also can better describe the deformation of the load with time over time.