Method for detecting cementation failure of undisturbed sand

A detection method and undisturbed technology, applied in the field of undisturbed sand cementation failure detection

Pending Publication Date: 2021-06-22
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

At present, there is a lack of a method that does not need to compare the stress-strain characteristics or strength characteristics with the undisturbed cemented sand and the sand with cemented failure, and does not need to do particle cementation analysis on the microscopic level, but only uses a sand particle aggregate sample to quickly judge the cementation Is it invalid?

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  • Method for detecting cementation failure of undisturbed sand
  • Method for detecting cementation failure of undisturbed sand
  • Method for detecting cementation failure of undisturbed sand

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Embodiment Construction

[0024] In order to make the technical means, innovative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0025] The invention provides a detection method for undisturbed sand cementation failure.

[0026] The present invention involves some abbreviations and symbols, the following are notes:

[0027] σ 1 : the vertical stress on the aggregate of particles

[0028] σ 2 and σ 3 : Horizontal stress on the particle aggregate, σ 2 and σ 3 The direction is vertical

[0029] ε 1 , ε 2 and ε 3 : strain, and respectively related to the stress σ 1 , σ 2 and σ 3 same direction

[0030] R: stress ratio,

[0031] ε v : volume strain, ε v =ε 1 +ε 2 +ε 3

[0032] t 0 ,t 1 ,t 2 ,...,t i ,...,t n : The starting moment of recording during loading is t 0 , and then the recorded time is t from small to large 1 ,t 2 ,...,t i ,...,t n ,...

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Abstract

The invention belongs to the field of geotechnical engineering research, and particularly relates to a method for detecting cementation failure of undisturbed sand, which comprises the following steps of: calculating a stress ratio, volume strain and axial strain through a triaxial sample of a particle aggregate, calculating corresponding parameters, and calculating the cementation failure of the undisturbed sand without respectively comparing stress-strain characteristics or strength characteristics with cementation undisturbed sand and cementation failure sand, using only one triaxial sample for quickly judging whether the cementation is invalid or not, and microscopically particle cementation analysis being not needed.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering research, in particular to a detection method for undisturbed sand cementation failure. Background technique [0002] Some undisturbed sandy soils in engineering have weak cementation, but their cementation is affected by disturbance or load. When weak bonds fail, both the stress-strain and strength properties of sandy soils change. At present, there is a lack of a method that does not need to compare the stress-strain characteristics or strength characteristics with the undisturbed cemented sand and the sand with cemented failure, and does not need to do particle cementation analysis on the microscopic level, but only uses a sand particle aggregate sample to quickly judge the cementation Is it invalid. Contents of the invention [0003] The present invention does not need to compare the stress-strain characteristics or strength characteristics with the undisturbed cemented sand and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 金炜枫马永航陶颖
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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