Collapsible loess constitutive simulation method for transmission lines

A technology of collapsible loess and simulation method, which is applied in the field of stress-strain simulation of collapsible loess foundations, can solve problems such as structural damage of saturated loess in the consolidation stage and shear stage, and achieve wide applicability, uniqueness and Accurate, mechanically well-defined effects

Inactive Publication Date: 2018-04-10
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0004] In view of this, the present invention aims at the problem of structural damage of saturated loess in the consolidation stage and shear stage, and provides a method for constructing a structural soil constitutive model based on the results of indoor compression tests and conventional triaxial tests, through kinematic hardening The structural model introduces a hardened yield surface that moves the center of the structural surface

Method used

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  • Collapsible loess constitutive simulation method for transmission lines
  • Collapsible loess constitutive simulation method for transmission lines
  • Collapsible loess constitutive simulation method for transmission lines

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Embodiment example 2

[0075] Based on "The dynamic constitutive model of saturated loess and its application in the seismic dynamic interaction of pile-soil-structure system" (Hu Wei. The dynamic constitutive model of saturated loess and its application in the seismic dynamic interaction of pile-soil-structure system Using [D]. Xi'an University of Architecture and Technology, 2008.), the results of the undrained triaxial test of isobaric consolidation of saturated loess with different pre-consolidation stresses are carried out as follows:

[0076] (1) According to the loess physical properties given in the paper, combined with empirical formulas, the relevant material parameters and state variables of the constitutive model are obtained. The physical properties given in the paper are shown in Table 1 below:

[0077]

[0078] (2) Due to the lack of parameter λ in the text * and κ * In the absence of compressibility test data, the compression index C of remolded soil introduced in "Principles of ...

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Abstract

The invention discloses a collapsible loess constitutive simulation method for transmission lines. The method comprises the following steps of 1, measuring and recording the test average stress or axial stress according to a loess sample indoor compression test and a triaxial undrained test result; 2, determining material constants involved in boundary surface equations of a constitutive model, and using a modified Cambridge model to derive the boundary surface equations of remolded soils; 3, using the associated flow rule and combining with the isotropic hardening and kinematic hardening rules to control the change of yield surface size and center position, using interpolation calculations to determine plastic modulus, and determining the constitutive model; 4, selecting appropriate soilparameters and state variables, so that simulation results and natural soil sample triaxial test results are consistent.

Description

technical field [0001] The invention relates to the field of stress-strain simulation methods for collapsible loess foundations, in particular to a constitutive simulation method for collapsible loess of power transmission lines. Background technique [0002] The loess in the natural state has high strength and low compressibility, but its structure will be destroyed rapidly after being soaked in water under a certain pressure, which brings serious safety hazards to the foundation of transmission line towers in the loess area. In the past, when analyzing the mechanical change characteristics of soil, the changes of humidity, density and particle size were often used to analyze the changes, and the important influencing factor of soil structure was ignored. In this case, it is necessary to study the influence of structure on the engineering physical and mechanical properties of loess foundation in transmission line engineering. [0003] Most of the existing constitutive mode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/24G01N33/24
Inventor 胡鑫钱建固刘湘莅郭新菊席小娟汪秋雨顾晓强齐道坤奚妍梁晟景川
Owner STATE GRID CORP OF CHINA
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