Method for quickly determining discrete element model parameters of rock-like brittle material

Abstract

The invention discloses a method for quickly determining discrete element model parameters of a rock-like brittle material. According to the method, a discrete element model corresponding to an experiment is built by combining a compression experiment of a limestone material; a model parameter determination problem is transformed into an optimization problem; a minimum error between an experimenttest response and a discrete element numerical calculation response is taken as an objective function; a real physical model is replaced with an approximate model; reverse calculation is carried out by adopting a global optimization-based intelligent algorithm; and a group of optimal discrete element model parameters of the limestone material are quickly obtained. According to the method, the discrete element model parameters of the material are quickly determined on the basis of a few physical experimental data, the calculation efficiency and calculation accuracy for parameter determination are effectively improved, the model parameters which cannot be easily determined in a traditional method can be quickly and effectively determined, the precision of a discrete element digital model isimproved, application development of a discrete element method in performance research of the brittle material is facilitated and the method has good practical value.

Description

technical field [0001] The invention belongs to the field of determining parameters of discrete element models of brittle materials, and in particular relates to a method for obtaining parameters of discrete element models of rock-like brittle materials. Background technique [0002] Rock is a natural geological body with characteristics of discontinuity, heterogeneity, anisotropy and nonlinearity. With the construction of high-speed railways, excavation of tunnels, construction of protective engineering, and exploitation of shale gas, the study of rock failure criteria is becoming an important hotspot. [0003] The discrete element method is a reliable and effective numerical simulation method, which has been widely used in the study of the mechanical properties of rock-like brittle materials. Based on Newton's second law of motion, the problem is analyzed mechanically. When using the discrete element method to study rock problems, it is first necessary to determine the m...

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Problems solved by technology

[0005] Aiming at the problem that a large number of material experiments were required to determine the parameters of the discrete element model of rock-like brittle materials in the past, the purpose of the present invention is to propose an effective method for determining the parameters of the discrete element model of rock-like brittle materials, which can be quickly and effectively obtained with only a small amount of experimental data Key Parameters in Discrete Element Modeling of Materials

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