Method for obtaining dynamic resilience mechanical characteristic parameters of aggregates

Abstract

The invention relates to the field of civil engineering, and discloses a method for acquiring dynamic resilience mechanical characteristic parameters of aggregates, which comprises the following steps: 1) deriving a stress increment constitutive equation of the aggregates, and determining a stress loading sequence according to the equation; 2) performing a dynamic triaxial test on the granules according to the stress loading sequence, recording the stress level, the stress increment, the corresponding horizontal deformation and the corresponding vertical deformation of the test, and calculating the horizontal strain increment and the vertical strain increment; 3) introducing a stress dependence model of dynamic resilience mechanical characteristic parameters; and 4) performing parameter regression analysis, and determining model parameters to obtain a nonlinear dynamic resilience mechanical characteristic parameter prediction model including dynamic resilience modulus, Poisson's ratioand orthotropic parameters. According to the method, the model for predicting the dynamic resilience mechanical characteristic parameters of the aggregate under different stress states can be established, the dynamic resilience mechanical characteristic parameters under various stress states can be conveniently and accurately obtained, and the requirements of engineering construction are met.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a method for obtaining dynamic springback mechanics characteristic parameters of granular materials. Background technique [0002] Aggregate is a common building material in civil engineering, and is widely used in road bases, cushions, etc. The dynamic resilience mechanical properties of pellets have typical stress dependence and orthotropy, that is, the dynamic resilience modulus and Poisson's ratio of pellets change with the change of stress level, and in different directions of force Up (horizontal and vertical) are also different. The dynamic resilience parameters of aggregates directly affect the mechanical characteristics and structural strength of the base, and then affect the design of civil engineering structures and parameters. Therefore, in civil engineering, it is necessary to obtain the dynamic springback mechanical characteristic parameters of aggregates under va...

AI Technical Summary

Problems solved by technology

Although these measures simplify the process of solving the mechanical parameters of aggregates, they inevitably reduce its accuracy and easily lead to unreasonable structural responses in structural calculations.

Recently, there have also been some studies on the stress dependence and orthotropy of the dynamic springback properties of pellets, but they are still mainly studied separately, and there is no fast and effective acquisition method

However, the simulation experiment method can only obtain the dynamic springback mechanical characteristic parameters under the set stress state, and the experimental process is complicated and the acquisition speed is slow.

[0004] The current method of obtaining dynamic springback mechanical characteristic parameters is far from meeting the requirements for obtaining dynamic springback mechanical characteristic parameters under various stress states in the process of civil engineering design and construction. big impact

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