采用二维颗粒流软件研究水泥冷再生混合料特性过程中本构模型和细观力学参数的标定

Determination of Constitutive Model and Micromechanical Parameters in the Simulation Test on the Property of Cement Cold Recycling Mixtures Using Particle Flow Code in 2D

基于PFC2D开展水泥冷再生混合料特性模拟试验研究的方法和其他研究方法相比具有不可比拟的优势,但是试验过程中细观力学参数的确定比较困难。为了快速确定细观力学参数,本文通过详细地分析水泥冷再生混合料的结构特性,确定内部颗粒的接触本构模型为线性刚度模型、滑动模型、平行黏结模型,从而确定了对应细观力学参数的个数。通过分析各细观力学参数之间的关系及其与宏观力学行为之间的对应关系,总结了调整参数的方法。并通过模拟试验进行验证,结果表明的细观力学参数的取值是正确的。通过本文方法今后可在相关研究中快速的调整出对应的细观力学参数值,为今后基于PFC软件深入研究水泥冷再生混合料特性奠定了基础。

Comparing with other research methods, the simulation test on the property of cement cold recycling mixtures using PFC2D has obvious advantags. However, it＇ s difficult to determine the nficromechanical parameters in the simulation. In order to determined the micromechanical parameters quickly, thes paper analyzed the structural property of cement cold recycling mixtures minutely, finally the contact constitutive model among all the aggregate was determined, including contact - stiffness model, slip model and parallel - bond model. Than, the number of micromechanical parameters was detemfined. Through analyzing the relationship between the micromechanical parameters and macro mechanical parameters, the method of adjusting parameters is proposed. The simulation test showd the determined micromechanical parameters are right. It can ensure the corresponding micromechanical parameters are quickly adjusted in the related research. It can lay a foundation for further research on the characteristics of cement cold recycleld mixture by using PFC.