Discrete element model construction method for realizing accurate control of single-particle breaking strength weibull distribution

Abstract

The invention discloses a discrete element model construction method for realizing accurate control of single-particle breaking strength weibull distribution. The method comprises the following steps:1, measuring the single-particle breaking strength and counting a strength characteristic value sigma 0 and a weibull modulus m of the weibull distribution, 2, measuring the size effect of the particle strength, 3, determining a macro-micro intensity corresponding relation: f (sigma<mu>)=sigma, 4, determining the corresponding relation between the particle size and the macroscopic strength: f(d)=sigma, 5, generating a particle discrete element model, 6, assigning values to the corresponding BCM particle models, and 7, repeating the step 6, and assigning values to the particles contained in the N groups of each particle size group until all parameters are successfully assigned. The method has the beneficial effect that the particle breaking strength distribution of the constructed discreteelement model is very consistent with the actual situation. The calculation principle is simple, the calculation program is concise and efficient, and the actual particle breaking strength characteristics can be effectively reflected. An effective technical means is provided for further understanding the mechanical behavior of the crushable granular material.

Description

technical field [0001] The invention relates to a discrete element model construction method, in particular to a discrete element model construction method for realizing precise control of single particle crushing strength Weibull distribution. Background technique [0002] At present, brittle granular materials are widely used in geotechnical engineering fields including rockfill dams, embankments, roads, and railways. When the external load applied to the particle exceeds the strength of the particle itself, the particle breaks. Usually, single-particle compression crushing chamber experiments are used to indirectly measure the particle strength σ (σ=F / d 2 ), where F is the peak force recorded on the roof during the entire loading process, and d is the particle size. Affected by the complex external environmental conditions in the process of particle formation, the internal structure of brittle particles is quite different. Thus, even particles of similar shape and size...

AI Technical Summary

Problems solved by technology

However, this method has the following defects: one is that when the particle removes too many units (such as 20%), the particle shows a porous character, which is not in line with reality

In addition, although this method can realize Weibull distribution, the strength characteristic value, Weibull modulus and size effect of particles are difficult to control

That is to say, it is extremely difficult to fully reflect the discreteness of the experimental results of the particle crushing strength in the construction of the discrete element model

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