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Sandy soil ratchet behavior prediction method

A prediction method and technology of behavior, applied in special data processing applications, instruments, electrical digital data processing, etc., to achieve the effect of accurate capture

Inactive Publication Date: 2021-12-10
CHINA THREE GORGES CORPORATION
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Problems solved by technology

Therefore, it is still challenging to use the dynamic constitutive model to describe the phenomenon of ratchet behavior

Method used

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  • Sandy soil ratchet behavior prediction method
  • Sandy soil ratchet behavior prediction method
  • Sandy soil ratchet behavior prediction method

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Embodiment Construction

[0049] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0050] The ratcheting behavior of sandy soil is predicted by a boundary surface plasticity model; the boundary surface plasticity model is established based on a generalized isotropic hardening criterion in the deviatoric stress ratio space. The boundary surface plasticity model refers to the stress history or limit state of the material represented by the boundary surface in the stress space. All stress state points can only be in the boundary surface or on the boundary surface. The current stress point and its position on the boundary surface The distance of the conjugate image points represents the gap between the current state of the material and the stress history or the limit state of matter, and the position and size of the boundary surface will change with the change of stress and strain, thus forming a plastic hardening modulus field in the s...

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Abstract

The invention provides a sandy soil ratchet behavior prediction method. The existing generalized isotropic hardening criterion is improved on the basis of physical mechanisms of cyclic stability and ratchet behaviors, and the improved criterion is popularized to a deviatoric stress ratio space. The thought of'memory 'structure change of a loading memory surface is combined with the concept of a generalized isotropic hardening criterion, and the generalized isotropic hardening criterion suitable for sandy soil is established in a deviatoric stress ratio space. Based on a generalized isotropic hardening criterion, a boundary surface plasticity model capable of describing sand cycle stability and ratchet behavior is established in a deviatoric stress ratio space. According to the model, the cycle stability and ratchet behavior of the sand can be simulated only through three cycle parameters.

Description

technical field [0001] The invention belongs to the field of rock and soil mechanics, in particular to a method for predicting the behavior of a sand ratchet, in particular to a theoretical method for predicting the behavior of a sand ratchet under long-term cyclic loading. Background technique [0002] Under long-term cyclic loading, the dynamic response of sandy soil can be mainly classified into two phenomena: cyclic stability and ratchet behavior. Cyclic stability means that the cumulative plastic deformation of the soil under cyclic loading no longer increases, the soil reaches a stable state, and the stress-strain hysteresis loop is completely closed; the ratchet behavior indicates that the soil is in a state of continuous accumulation of plastic deformation during cyclic loading. The hysteresis loop is not closed and moves in the direction of strain growth. [0003] So far, most of the existing techniques for simulating the cyclic dynamic response of sand have focuse...

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Application Information

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IPC IPC(8): G06F30/20G06F119/14
CPCG06F30/20G06F2119/14
Inventor 李洲张炜李鹏罗仑博代加林
Owner CHINA THREE GORGES CORPORATION
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