A Modeling Method of Geotechnical Model

Abstract

The invention discloses a modeling method of a rock-soil model. The modeling method is characterized in that according to the natural forming process of a particular rock body, the particles naturally fall, stack, are compressed and make full contact with each other in a specified area, then configuration is carried out by removing particles in the shape different from specified shapes, and the left particles are balanced in a calculation mode to obtain an initial ground stress field. Compared with classical steps, mul is needless to be calculated in the method, a separation wall between a slope wall and a soil layer is needless to be built, suspending particles are needless to be removed, but the calculation and configuration processes during falling of the particles are added. The method includes the following steps of building the model peripheral separation wall, setting rigidity of the wall, generating the particles in the projecting area in the vertical direction of stratified rock soil, setting gravity acceleration, a particle density, rigidity and a friction coefficient, calculating the particles until the needed stacking height is reached, setting mutual functions among the particles, deleting the unnecessary particles and calculating the particles until a balance is reached. The modeling method can be used for building a rock engineering model.

Description

technical field [0001] The present invention relates to geotechnical engineering, especially involving In geotechnical engineering simulation, modeling of loose granular rock and soil mass. Background technique [0002] PFC3D is a high-end product released by Itasca in 2008, which is especially suitable for the research of complex mechanism problems. It is a micro / micro-mechanics program developed by using explicit difference algorithm and discrete element theory. It considers the basic mechanical properties of the medium from the perspective of the basic particle structure of the medium, and considers the basic properties of a given medium under different stress conditions It mainly depends on the change of the contact state between particles, and is suitable for studying the cracking and cracking development of granular aggregates, as well as large displacement problems such as the flow of particles. In geotechnical engineering, it can be used to study a series of prob...

AI Technical Summary

Problems solved by technology

[0027] According to the modeling steps provided by the PFC3D user manual, there will be some problems in modeling, such as the difficulty in determining the radius magnification factor (mul), the difficulty in ensuring the contact degree of grain boundaries with different properties, and the removal of the boundary wall between the slope wall and the soil layer. The problem of the ball flying out, the influence of the model shape is not considered when determining the mul after specifying the porosity, etc.

These problems make the model construction inaccurate, and the deformation of the model after calculation is large, resulting in rework and other problems.

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