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Method for determining uniaxial compressive strength damage of red mudstone after dry-wet cycle

A technology of uniaxial compressive strength and dry-wet cycle, which is applied in the direction of applying stable tension/pressure to test material strength, strength characteristics, instruments, etc., and can solve the problems of long and cumbersome test periods

Pending Publication Date: 2022-05-10
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the research on mudstone mechanical damage is based on uniaxial compressive strength test. In order to obtain the degree of mechanical damage, indoor sample preparation and destructive test are required, and the test cycle is long and cumbersome.

Method used

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  • Method for determining uniaxial compressive strength damage of red mudstone after dry-wet cycle
  • Method for determining uniaxial compressive strength damage of red mudstone after dry-wet cycle
  • Method for determining uniaxial compressive strength damage of red mudstone after dry-wet cycle

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Embodiment 1

[0028] The present invention carries out technical verification by the method of test, and concrete test process is as follows.

[0029] Uniaxial compressive strength test of red bed mudstone under dry-wet cycle:

[0030] On-site sampling and indoor sample preparation and dry-wet cycle test are carried out according to the specifications, and the uniaxial compressive strength test is carried out on the samples that have completed the dry-wet cycle. The loading rate is controlled by the formula, and the loading rate is set at 0.12mm / min, and the loading rate is maintained until the mudstone sample is destroyed.

[0031] Analysis of uniaxial compressive strength test results:

[0032] The results of uniaxial compression test of red bed mudstone under the action of dry-wet cycle are shown in figure 2 . From figure 2 It can be seen from the figure that the uniaxial compressive strength of the red bed mudstone decreases with the increase of the number of dry-wet cycles; under...

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Abstract

The invention discloses a method for determining the uniaxial compressive strength damage of red-layer mudstone after the dry-wet cycle action, which comprises the following steps: acquiring a stress-strain curve of a mudstone sample after the dry-wet cycle action to obtain the uniaxial compressive strength, and performing scanning electron microscope image processing on the mudstone after different dry-wet cycles to obtain the uniaxial compressive strength damage of the red-layer mudstone. Analyzing the porosity of the sample under a specific multiple, calculating a pore expansion coefficient, obtaining a change rule of the pore expansion coefficient along with a dry-wet cycle, and determining the correlation between the uniaxial compressive strength and the pore expansion coefficient based on response characteristics of the uniaxial compressive strength and the pore expansion coefficient; the method can be used for rapidly calculating the uniaxial compressive strength and the damage amount of the mudstone after the dry-wet cycle action.

Description

technical field [0001] The invention relates to the field of rock mechanics, in particular to a method for determining the uniaxial compressive strength damage of red mudstone after drying and wetting cycles. Background technique [0002] The red bed mudstone has the special property of being easy to disintegrate, expand and soften when exposed to water. Affected by the natural climate and groundwater level fluctuations, the slope or foundation is mostly in a state of alternating dry and wet cycles, and the dry and wet cycle is the cause of the red bed. It is an important reason for the strength damage of mudstone, and it is easy to cause a series of engineering problems. At present, most of the studies on mechanical damage of mudstone are based on uniaxial compressive strength tests. In order to obtain the degree of mechanical damage, indoor sample preparation and destructive tests are required, and the test cycle is long and cumbersome. There is a significant correlation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/02G01N3/08
CPCG01N3/02G01N3/08
Inventor 邱恩喜陈秋玲孙希望杜宪武邵永波张蕊舒中文聂文峰唐科行王智猛肖飞知万旭升渠孟飞路建国李康乐王知深刘凤云王彬何巧玲熊小田赵剑杰肖杰
Owner SOUTHWEST PETROLEUM UNIV
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