Numerical method for graded crushed stone dynamic triaxial test

Abstract

The invention discloses a numerical method for a graded crushed stone dynamic triaxial test. The numerical method comprises the following steps of: simulating the graded crushed stone dynamic triaxial test through establishing a physical model and a mechanical model by using a PFC2D software platform, wherein the simulation operation comprises test of basic parameters, simulation of a test model and generation of a graded crushed stone simulation specimen; secondly, giving micro mechanical parameters to the physical model, and constructing the mechanical model; and then, carrying out repeated dynamic load simulation on the graded crushed stone simulation specimen so as to obtain a graded crushed stone stress-strain curve and a graded crushed stone permanent deformation-loading frequency curve. According to the numerical method disclosed by the invention, the graded crushed stone permanent deformation-loading frequency curve in a triaxial test can be reproduced accurately, conveniently and quickly, and a graded crushed stone deformation rule is disclosed, so that the graded crushed stone fracture mechanism is favorable to research intensively; and the problems of high instrument price and inconvenience for operation in an indoor dynamic triaxial test are avoided, so that the test efficiency is improved, and the research cost is saved.

Description

technical field [0001] The invention belongs to the field of traffic civil engineering, and relates to a numerical method for a dynamic triaxial test of graded gravel. The method uses PFC 2D As a basic platform, the software can accurately simulate the accumulation process of plastic deformation of graded crushed stone under repeated loads, and predict the law of permanent deformation of graded crushed stone. Background technique [0002] Graded crushed stone is a typical road base material with extremely complex physical and mechanical properties. At present, indoor dynamic triaxial tests are often used to study the deformation behavior of graded crushed stones. The basic principles and steps are as follows: (1) Prepare specimens according to the maximum dry density and optimum water content; (2) Install a stress-strain monitoring system; (3) Apply axial dynamic pressure to the specimen; (4) Organize the test results to obtain the relationship curve between permanent defo...

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Problems solved by technology

[0003] The applicant analyzed the above-mentioned laboratory dynamic triaxial test method for graded crushed stones, and there are the following defects: (1) the test cost is high and the efficiency is low, which is not conducive to revealing the deformation behavior of graded crushed stones; (2) it is difficult to monitor the graded crushed stones under load. Internal material migration and mesomechanical characteristics of stone

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