Method for Determination of Minimum Specimen in Shear Test of Anchored Structure Surface

Abstract

A method for determining the minimum sample size of an anchorage structural surface shear test, comprising the following steps: 1) making a concrete sample according to the principle of indoor sample similarity ratio; 2) inserting a smooth plastic tube during the manufacturing process and monitoring stress and strain; Take out the plastic pipe, insert a bolt and inject cement slurry, and evenly arrange fiber grating sensors on the surface of the bolt; 4) Use a large-scale direct shear instrument to conduct a direct shear test on the sample; 5) Use MATLAB software to mathematically analyze the stress and strain signals processing, slice analysis is performed to obtain the stress influence range of the anchor rod on the sample, which is the minimum unit size of the anchored structural surface shear sample; 6) use numerical simulation analysis to verify the above minimum unit size; 7) repeat step 1 )—6) That is to obtain the smallest sample for the shear test of the structural surface strengthened by multiple anchor rods. The invention improves the accuracy and scientificity of the test results, and at the same time, can avoid material waste caused by excessive sample size.

Description

technical field [0001] The invention belongs to the technical field of indoor physical and mechanical tests, and relates to a method for determining the minimum sample size of an anchorage structural surface shear test. Background technique [0002] In recent years, with the rapid development of my country's economy, some large-scale construction projects related to the national economy and people's livelihood have been implemented one after another, such as large-scale hydropower projects in the central and western regions, expressways and high-speed railways, deep resource mining, strategic oil reserves, and nuclear power projects. The stability and catastrophe problems of large-scale open-pit mine slopes are quite prominent, especially the landslide geological disasters on the slopes of large-scale open-pit mines, which seriously affect production at least, and cause casualties and heavy losses of equipment and mineral resources. Anchoring technology is an important means ...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of existing anchorage structural surface shear tests that cannot take into account the accuracy of test results, test difficulties and waste of materials, the present invention provides a method for determining the minimum sample size of anchorage structural surface shear tests, which can avoid boundary effects It improves the accuracy and scientificity of the test results, and at the same time avoids material waste caused by excessive sample size, providing a scientific basis for the design of shear tests on anchored structural surfaces

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