A multi-field coupled discrete element fast simulation modeling method for soil dehydration and cracking
A modeling method and discrete element technology, applied in instrumentation, design optimization/simulation, calculation, etc., can solve difficult problems such as multi-field interaction and lack of
Active Publication Date: 2019-06-25
南京南力科技有限公司
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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
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[0009] The working process of the inventive method is as Figure 1-Figure 3 shown.
[0010] figure 1 Flowchart for the implementation of the 3D discrete element modeling and simulation method for soil dehydration cracking.
[0011] Step 10 inputs the mechanical properties of the soil and the geometric parameters of the model, including the density of the soil, the tensile strength of the soil, the compressive strength of the soil, Poisson's ratio, elastic modulus and model size, etc.;
[0012] Step 11 establishes a three-dimensional hexagonal closest packing discrete element model according to the model and particle radius, as shown in the accompanying drawing;
[0013] Step 12 is to set the initial mechanical parameters between the units according to the conversion formula, and set the initial moisture content of the units, etc. The positive and tangential forces are considered between the model particle units, and are determined by five parameters: positive stiffness coef...
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The present invention provides a fast multi-field coupling discrete element modeling method for soil dehydration and cracking, that is, a multi-field coupling discrete element modeling and simulation method for cohesive soil dehydration and cracking, including: 1) constructing a three-dimensional close-packed discrete The element model is given the water content attribute of the element, and the finite difference idea is used to realize the water field simulation; 2) Consider the influence of the water field on the mechanical properties such as the tensile strength of the discrete element, and establish the coupling of the water field and the stress field; 3) Assume that the soil is The water on the surface of the three-dimensional close-packed discrete element model evaporates at a certain rate, and the relationship between the water content and the shrinkage of the three-dimensional discrete elements of the soil is established according to the test data, and the deformation and failure of the three-dimensional discrete elements of the soil are calculated in the discrete element method, so as to realize the clay Multi-field coupling discrete element fast simulation and modeling of soil evaporation, shrinkage and cracking deformation process. Realize the multi-field coupling simulation of clay evaporation and water loss, shrinkage and cracking deformation process. The invention provides a new method for soil deformation and damage simulation under multi-field action.
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 ...
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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 刘春施斌张晓宇许强张丹顾颖凡刘兵
Owner 南京南力科技有限公司