Lever-type sample preparation machine for disturbed soil triaxial compression test and sample preparation method thereof

Abstract

The invention discloses a lever-type sample preparation machine for a disturbed soil triaxial compression test and a sample preparation method thereof. A sample preparation mold is fixed to a mold support plate. The mold support plate is fixed to the slider of a linear guide rail. The slider, the mold support plate and the sample preparation mold can be integrally detached from the guide rail multiple times in order to separately load various soil sample layers into the sample preparation mold. A lifting plate is connected with the push rod of a lever assembly. The force applying arm of the lever assembly rotates to lift or lower of a punch pin so that the punch pin compacts each soil sample layer in the sample preparation mold to a set thickness. The operation only requires to press downthe force applying arm manually. Multiple samples can be pressed at one time. The punching depth of the punch pin is controlled by a positioning frame to control the different heights of the force applying arm. The limit of the different heights of the positioning frame can be calculated in combination the size of the force applying arm and a motion track during sample preparation. The lifting plate is guided by a vertical pole when moving. The lever-type sample preparation machine can precisely control the thickness and flatness of the sample layers, has high sample preparation efficiency, and is simple in molding and demolding operation.

Description

technical field [0001] The invention relates to a sample preparation device for a triaxial compression test, in particular to a lever type sample preparation machine and a sample preparation method for a disturbed soil triaxial compression test. Background technique [0002] Triaxial compression test is a test method for measuring the shear strength of soil. Usually, 3 to 4 soil samples are used to apply axial pressure under different confining pressures, and shear until failure. The outstanding advantages of the triaxial compression test are that the drainage conditions can be controlled more strictly and the pore water pressure change in the test sample can be measured, and the stress state in the sample is relatively clear. [0003] According to the specification requirements, during the triaxial compression test, the disturbed soil sample is generally prepared by the compaction method, and the sample preparation steps and requirements are as follows: [0004] The soil s...

AI Technical Summary

Problems solved by technology

[0006] 1. Only one sample can be produced at a time, the sample preparation steps are cumbersome, the sample preparation efficiency is low, and the physical strength of the sample preparation personnel is relatively large;

[0007] 2. Each layer of soil sample may be subjected to uneven force, which makes it difficult to accurately control the height, flatness and density of the sample, and it is difficult to meet the specification requirements;

[0008] 3. There will be harsh hammering sound during sample preparation, and the generated vibration is relatively large, causing serious noise pollution

[0009] 4. The shaving equipment is a single shaving needle, which takes a long time and is inefficient

However, after the sample pressing is completed, the sample preparation device needs to be dismantled to take out the sample. The process is complicated and the efficiency is not high.

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