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针对粗粒料的剪胀特性和强度非线性,在经典弹塑性理论框架内,建立了一个基于细观结构的粗粒料弹塑性本构模型。模型采用基于颗粒材料细观结构变化推导得到的屈服函数,在此基础上由非相关联流动法则得到的剪胀方程,结合粗粒料典型的三轴压缩试验结果,引入一种无黏性土的压缩模式,构造了能够统一描述粗粒料剪胀、剪缩特性的硬化参数。阐述了由常规三轴试验和等向压缩试验确定模型全部7个参数的方法。对3种粗粒料三轴压缩试验结果进行了预测,预测结果与试验结果吻合良好,说明模型能够合理地反映粗粒料的应力变形特性。
Aimed at the dilatancy and strength nonlinearity of coarse aggregate, a coarse-grained elasto-plastic constitutive model based on mesoscopic structure was established in the framework of classical elasto-plastic theory. Based on the yield function derived from the change of the microstructure of the granular material, the model uses the dilatancy equation obtained by the non-associated flow law and the typical triaxial compression test result of the coarse aggregate to introduce a non-cohesive soil The compression model was used to construct the hardening parameters which can describe the dilatancy and shear-shrinkage characteristics of coarse aggregate uniformly. The method of determining all seven parameters of the model by conventional triaxial tests and isotropic compression tests is described. The results of triaxial compression tests of three kinds of coarse aggregates were predicted. The predicted results agree well with the experimental results, which shows that the model can reasonably reflect the stress-strain characteristics of coarse aggregates.