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

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 ...

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.

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