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Collapsible loess foundation stress-strain simulating method for overhead transmission line

A technology for overhead transmission lines and collapsible loess, which is applied in the direction of applying stable tension/pressure to test the strength of materials, and can solve the problems of poor soil strength attenuation simulation effect, failure to reflect structural deformation characteristics, and unreasonable application. , to achieve the effect of ensuring uniqueness and accuracy, wide applicability, and clear mechanical meaning

Inactive Publication Date: 2018-03-30
STATE GRID CORP OF CHINA +2
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Problems solved by technology

Most of the existing constitutive models are based on the remodeling disturbed loess as the research object, which does not reflect the structural deformation characteristics, which is a unique property of natural undisturbed loess. And the soil strength attenuation simulation effect caused by structural damage is not good, so it is obviously unreasonable to apply it in actual engineering

Method used

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  • Collapsible loess foundation stress-strain simulating method for overhead transmission line
  • Collapsible loess foundation stress-strain simulating method for overhead transmission line
  • Collapsible loess foundation stress-strain simulating method for overhead transmission line

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Embodiment example

[0086] 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 Apply the undrained triaxial test results of isobaric consolidation of saturated loess with different pre-consolidation stresses in [D]. Xi'an University of Architecture and Technology, 2008.), perform the following operations:

[0087] (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:

[0088]

[0089] (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 o...

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Abstract

The invention discloses a collapsible loess foundation stress-strain simulating method for an overhead transmission line. The collapsible loess foundation stress-strain simulating method for the overhead transmission line comprises the following steps: (1) according to results of an indoor compression test and a constant-pressure consolidated undrained test of a saturated remoulded loess sample, measuring and recording average stress or axial stress of the tests, and drawing an e-lgp curve of the indoor compression test and a soil body stress-strain relationship curve and an lnv-lnp curve of the constant-pressure consolidated undrained test; (2) respectively determining the early consolidation stress of a soil body and material constants and the like involved in a constitutive model boundary surface equation, and obtaining a boundary surface equation of remoulded soil by utilizing a modified Cam-Clay model; (3) controlling the size of a yield surface and the change of a central position by adopting an associated flow rule and combining isotropic hardening and kinematic hardening rules, and solving plasticity modulus and determining a constitutive model through interpolation calculation of the distance between a current stress point and an image stress point; (4) selecting suitable soil body parameters and a state variable initial value to make a simulation result accord with the result of an undisturbed soil constant-pressure consolidated undrained shear test.

Description

technical field [0001] The invention relates to the technical field of stress-strain simulation of collapsible loess foundations, and relates to a stress-strain simulation method for collapsible loess foundations of overhead 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] The research on the con...

Claims

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Application Information

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IPC IPC(8): G01N3/08
Inventor 胡鑫钱建固刘湘莅郭新菊奚妍汪秋雨顾晓强郭正位杨敏
Owner STATE GRID CORP OF CHINA
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