红粘土细观力学特性的颗粒流模拟

Simulation of Mesoscopic Mechanic Properties on Red Clay by Using Particle Flow Code

红粘土作为一种特殊的工程土,对其研究多集中在宏观力学响应,而从细观角度解释其力学特性的研究较少。根据室内三轴试验获得的红粘土宏观力学性质指标,进行了基于PFC3D的颗粒流数值三轴试验,标定出红粘土颗粒的接触力、接触模量、粘结强度等细观力学参数,实现了细观力学参数与宏观力学指标的统一。细观参数反映出红粘土力学性质的本质特点。

As a kind of special engineering soil,the research regarding the red clay is mainly focused on the macroscopic mechanical response.However,contrast to the macroscopic mechanism,the mesoscopic mechanism,which was used to explain the red clay mechanical properties,has been less analyzed.By referring to the red clay macroscopic mechanism indicator produced by the indoor triaxial test,this paper has proposed the triaxial test based on the PFC3 D particle flow code numerical simulation.Besides,it also has calibrated some mesoscopic mechanical parameters such as the red clay particles contact force,contact modulus and bond strength,etc.This paper not only achieves the unification of the mesoscopic mechanical parameters and macro mechanics index,but also uses themacroscopic parameter to reflect the essential characteristics of the mechanical properties.