Discrete Element Method for Coarse Aggregate Particles in Broken State

Abstract

The invention discloses a smashed-state coarse aggregate discrete element method. The smashed-state coarse aggregate discrete element method comprises the following steps: (1) performing initial screening of coarse aggregate particles; (2) performing CT scanning; (3) performing PFC2D modeling of discrete element software; (4) calibrating parameters of a single-particle-size coarse aggregate particle contact rigidity model; (5) performing statistics to obtain the smashing amount of single-particle-size coarse aggregate particle under penetration resistance; (6) performing statistics to obtain the smashing amount of different grades of coarse aggregate particles under penetration resistance; and (7) correcting parallel connection model parameters based on the coarse aggregate particle smashing amount. Through adoption of the smashed-state coarse aggregate discrete element method, the problem that virtual coarse aggregate particles cannot be smashed in a road engineering discrete elementsimulation process is solved. Micro model parameters of particles of different particle sizes are determined by a Cluster model in discrete element software in conjunction with statistics of the smashing amount in an indoor penetration resistance test in order to simulate a smashing process of a particle material under the action of external resistance, and the virtual coarse aggregate particle shape rebuilding accuracy is ensured by image scanning.

Description

technical field [0001] The invention relates to a discrete element method for aggregate particles in road engineering, in particular to a discrete element method for coarse aggregate particles in a broken state. Background technique [0002] In the numerical discrete simulation test of road engineering, the simulation of the broken state of particles has always been a difficult point, which has become an obstacle to accurate simulation. Most of the existing simulation methods use discrete element software PFC2D / 3D. When simulating coarse aggregate particles, The clump command has been defined as a rigid body. Under this command, the virtual particles cannot be broken. In the actual simulation experiment, the virtual particles formed by this method are under the conditions of large stress and large strain. The virtual simulation results are quite different from the actual ones, and the particle breakage cannot be described. , The true state of specimen failure. Contents of ...

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Problems solved by technology

[0002] In the numerical discrete simulation test of road engineering, the simulation of the broken state of particles has always been a difficult point, which has become an obstacle to accurate simulation. Most of the existing simulation methods use discrete element software PFC2D / 3D. When simulating coarse aggregate particles, The clump command has been defined as a rigid body. Under this command, the virtual particles cannot be broken. In the actual simulation experiment, the virtual particles formed by this method are under the conditions of large stress and large strain. The virtual simulation results are quite different from the actual ones, and the particle breakage cannot be described. , The true state of specimen failure

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