Rapid simulation modeling method for multi-field coupled discrete elements of soil water loss and cracking

Abstract

The invention provides a rapid simulation modeling method for multi-field coupled discrete elements of soil water loss and cracking which is a multi-field coupled discrete element modeling and simulation method used in cohesive soil water loss and cracking. The method comprises following steps: 1) constructing a three-dimensional close packing discrete element model, giving the water content attribute to the element, and using the finite difference theory to simulate a water field; 2) building coupling of the water field and a stress field taking account of influences on mechanical properties such as tensile strength of discrete elements from water field; 3) assuming that the surface water content of the soil three-dimensional close packing discrete element model evaporates at a certain speed, the relationship between the water content and the three-dimensional discrete element shrinkage of the soil is established based on the experimental data, and the deformation and fracture of the three-dimensional discrete element of the soil is calculated in the discrete element method to realize rapid simulation and modeling of multi-field coupled discrete element for evaporation water loss, shrinkage and cracking deformation of clay soil. Multi-filed coupled simulation of evaporation water loss, shrinkage and cracking deformation of clay soil is achieved. The invention provides a novel method for simulating soil deformation and fracture under multi-field effect.

Description

technical field [0001] The invention relates to the simulation of water loss and cracking of cohesive soil, especially the multi-field coupled three-dimensional discrete element modeling and simulation method. Background technique [0002] Cohesive soil is widely distributed and is often used as building foundations or as materials such as dams and embankment fills. Due to drying and water loss, shrinkage cracks often appear on the surface and inside of cohesive soil, which greatly enhances the permeability, overall strength and stability of the soil. Soil cracking is subject to multi-field coupling, and the influencing factors are very complex. In addition, the inhomogeneity of soil particles and the variability of soil properties affected by the environment make the simulation of soil cracking extremely difficult. Numerical simulation of soil drying shrinkage cracks is an important means to study and predict the formation and development of soil cracks. Discrete element ...

AI Technical Summary

Problems solved by technology

However, the theoretical and applied research of 3D discrete element models is still in its infancy, and the theoretical and numerical simulation tools for 3D discrete element multi-field coupling (such as temperature field, moisture field, stress-strain field, etc.) are still lacking.

The current research work is mostly based on some commercial software (such as PFC), which is difficult to solve the problem of multi-field interaction

Images