Dual-mode sample preparation and demolding method for unsaturated soil triaxial experiments

A technology of triaxial experiment and sample making mold, which is used in the preparation, sampling, measuring device and other directions of test samples, which can solve the problems such as the calculated density is not the actual density, and the uncontacted end of the sample end is loose.

Pending Publication Date: 2021-02-02
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the direct contact between the jack and the soil sample in the traditional sample preparation device, the end of the sample is dense and the uncontacted end is loose, resulting in the calculated density after sample preparation is not the actual density

Method used

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  • Dual-mode sample preparation and demolding method for unsaturated soil triaxial experiments
  • Dual-mode sample preparation and demolding method for unsaturated soil triaxial experiments
  • Dual-mode sample preparation and demolding method for unsaturated soil triaxial experiments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Prepare a soil sample with a certain moisture content according to the sample required by the test, put it in a plastic bag and put it in an airtight container for 24 hours, then take it out for use.

[0035] According to the required sample size and quality, weigh the soil samples for later use.

[0036] The number of pads in the sample cylinder is configured according to the height of the sample, and a layer of Vaseline is evenly applied to the inner wall of the convex three-lobed intima.

[0037] Pour the soil required for the production time into the double-mold cylinder for making the test piece, and smooth the surface of the soil.

[0038] Use a universal testing machine or a jack to compact the soil with static pressure to a certain required height of the specimen.

Embodiment 2

[0040] The compacted test piece is placed on the demoulding machine, and the bulldozer of the demoulding machine should be aligned with the center of the solid pad inside the test piece cylinder.

[0041] Then turn on the demoulding machine, the bulldozer rises slowly, and pushes the block of the test piece cylinder upwards along the inner membrane wall at a constant speed.

[0042] The convex three-lobe inner mold is gradually pushed out to remove the three-lobe inner membrane, so as to obtain a complete, non-destructive and highly accurate soil specimen.

[0043] In this process, high-quality soil specimens can be obtained under the premise of ensuring the test speed, which provides a guarantee for the later test.

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Abstract

The invention relates to a dual-mode sample preparation and demolding method for an unsaturated soil triaxial experiment, and solves the problems of damage to a test piece and height reduction causedby demolding due to the phenomena of loosening and non-uniformity of the end part of the traditional sample preparation. The machine sample preparation precision is low, the manual sample preparationlabor amount is large, and the quality and quantity are guaranteed. The device basically comprises an upper baffle plate, a lower baffle plate, four upright post sample outlet holes, a convex three-petal inner die, a convex cushion block, a sample pushing top cover and a groove outer die. Looseness, density and non-uniformity of a sample manufacturing compaction end are considered; the demouldingprocess is vulnerable, and density deviation is calculated. Dual-mode sample preparation is applied to a sample pressing method, so that the accuracy of a test piece is improved. The device is different from a traditional three-section mold, the outer surface of the device is convex to be embedded with a double-mold outer cylinder, and more importantly, sliding demolding is facilitated. The deviceis composed of the double-layer mold and the cushion block, the inner mold and the cushion block can be embedded and can also be taken out in a sliding mode, thrust acts on the convex cushion block in the demolding process to push the three-section inner mold, and the defects of traditional sample preparation are overcome.

Description

technical field [0001] The invention is used to solve the problems of uneven compactness, unequal heights of samples and easy damage of demoulding in unsaturated soil during triaxial test sample preparation and sample pressing method. Background technique [0002] The traditional molding device and demoulding have the following disadvantages: [0003] When the traditional molding device is used for sample preparation by compression method, the compactness of the end of the sample cannot be kept consistent. [0004] In the traditional sample preparation device, there is no solid pad in the sample cylinder, and the compaction process is very destructive. [0005] There are large errors in the height of the sample prepared by the traditional sample preparation and demoulding device, which are different. [0006] Due to the direct contact between the jack and the soil sample in the traditional sample preparation device, the end of the sample is dense and the uncontacted end is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/36G01N1/28
CPCG01N1/286G01N1/36G01N2001/366
Inventor 李国金王淼孟上九穆海龙
Owner HARBIN UNIV OF SCI & TECH
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