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High-precision frozen soil p-equaling-constant test method

A test method, a high-precision technique, applied in the direction of strength characteristics, testing material strength using applied stable tension/pressure, measuring devices, etc.

Inactive Publication Date: 2019-07-02
国网内蒙古东部电力有限公司经济技术研究院 +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to change the current situation of lack of complex stress path tests in frozen soil mechanical test methods, the present invention provides a high-precision frozen soil etc. p test method

Method used

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Embodiment Construction

[0028] The features of the present invention and other relevant features are further described in detail through the specific test process below, so as to facilitate the understanding of researchers in the same industry:

[0029] The present invention adopts the freezing Lanzhou loess that water content is 16.68% to make specimen and carry out the equal p test of frozen soil, and concrete steps are as follows:

[0030] 1. Preparation of frozen soil samples

[0031] First prepare the soil into a loose soil body with the target water content, and keep it under the condition of limited evaporation for about 6 hours to make the water uniform in the soil body, then install the mold in layers, and compact the soil according to the dry bulk density required by the test. Form a cylindrical sample with a height of 125mm and a diameter of 61.8mm. Put the sample together with the mold into the refrigeration box, and freeze it quickly in the environment of -30 ° C. After about 48 hours o...

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Abstract

The invention discloses a high-precision frozen soil p-equaling-constant test method, which comprises the following steps: a) putting a frozen soil sample into a low-temperature tri-axial apparatus pressure chamber, and realizing consolidation under a given confining pressure; b) calculating correction area based on axial strain to set each stage of axial force, realizing approximate p-equaling-constant test, calculating volumetric strain after finishing loading, calculating correction area based on the axial strain and the volumetric strain and obtaining an actual mean stress p; c) checking whether the p obtained in the step b) is a constant within a permissible range of accuracy, if so, ending the test, or otherwise, carrying out fitting to obtain a relation between the axial strain epsilon1 and the sample cross-sectional area A through a high-precision function; and d) according to the epsilon1-A relation obtained in the step c), setting each stage of axial force and confining pressure and carrying out p-equaling-constant test, after finishing the test, calculating true cross-sectional area and p, and if the p can be regarded as a constant within the permissible range of accuracy, judging that the test is the p-equaling-constant test, or otherwise, carrying out p-equaling-constant test again according to a new epsilon1-A relation, and repeating iteratively until the obtainedp can be regarded as a constant.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of geotechnical tests, and specifically relates to a method for realizing high-precision equal-p tests in frozen soil, which provides a new method for investigating the mechanical behavior of frozen soil under complex stress paths and verifying the constitutive model of frozen soil experiment method [0003] Background technique: [0004] The equal p test refers to maintaining the average stress p=(σ 1 +σ 2 +σ 3 ) / 3 is a constant test, which can be used to investigate the effect of equivalent shear stress on the deformation characteristics of rock and soil materials under different p values, and can also be used to verify the constitutive model of rock and soil materials. In the elastoplastic constitutive relation, it is necessary to use the test results of the p test to determine the yield surface and hardening law. At present, except for a few equal p tests in thawed soils, there are no reports ...

Claims

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Application Information

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IPC IPC(8): G01N3/18G01N3/02
CPCG01N3/02G01N3/18G01N2203/0019G01N2203/0228
Inventor 刘万福张海宁曹阳曹春诚晨光张松徐湘田白瑞强杨宗维张伟东
Owner 国网内蒙古东部电力有限公司经济技术研究院
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