Modeling method of discrete element fluid-solid coupling grid model based on ABAQUS-PFC3D

Abstract

The invention discloses a modeling method of a discrete element fluid-solid coupling grid model based on ABAQUS-PFC3D. The method comprises the following steps: building a pretreatment grid-junction model with ABAQUS, rewriting information of the model so as to determine unit and junction information and geometric characteristics imported into a PFC flow domain grid model, importing a fluid grid into a PFC3D simulation platform, and endowing the fluid grid with hydrodynamic parameters; building sphere and wall elements, endowing with micro-parameters and initial conditions, and performing iterative operation of fluid-solid coupling analysis till balance.

Description

technical field [0001] The invention relates to a modeling method of a discrete element fluid-solid coupling grid model based on ABAQUS-PFC3D. Background technique [0002] In the analysis of the design feasibility and safety and stability of underground engineering, the influence of groundwater in most working conditions cannot be ignored. Groundwater will have a great impact on the mechanical properties of rock and soil, and will also affect the construction safety belt Here comes the hidden danger. [0003] At present, the finite element method is widely used in the modeling of rock and soil in underground engineering, but the finite element method is based on the assumption of continuity, which does not conform to the nature of rock and soil as a discrete medium, so PFC3D based on discrete elements The software is widely used in the numerical simulation of rock and soil, and the discrete element method simulation based on PFC3D has played a positive role in engineering ...

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Problems solved by technology

[0006] 2. When PFC3D considers water-rock-soil interaction, that is, in the process of fluid-solid coupling simulation, because it lacks a visual modeling method for fluid-solid coupling grid models, it can only carry out extremely simple watersheds with fewer units mesh modeling;

[0007] 3. PFC3D only supports the modeling of the fluid-solid coupling mesh model in the command flow mode, and the command flow is complex. In the absence of visualization, designers and evaluation personnel can only imagine the numbers and coordinates of units and nodes out of thin air. Taking 1000 units as an example, 14002 unit information data need to be input. In addition, node information needs to be input, and nodes will be shared between units. If there is no visual modeling method, it is extremely difficult to model any geometric model. difficult;

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