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A remodeling soil layered sampling device and sample preparation method thereof

A technology of layering samples and reshaping soil, which is applied in the preparation of test samples, etc., can solve the problems of measurement accuracy interference, high dry density of samples, and easy to produce errors, etc., and achieve cost reduction, simple operation, and easy production. same exact effect

Active Publication Date: 2017-05-03
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the height of the soil sample is generally controlled by observing the scale of the ruler or vernier caliper, that is, after a certain number of compactions, use the ruler to measure the height of the compacted soil sample. If the height is greater than the predetermined height, continue to compact. And repeat the previous steps. Once the height is less than the predetermined height, it means that the dry density of the sample obtained at this time is greater than the predetermined value. In order to ensure the accuracy of sample preparation, it is necessary to re-sample, which is time-consuming and laborious.
In addition, when using a ruler or a vernier caliper to measure the height of a soil sample, the measurement accuracy is greatly disturbed by human factors, and errors are easily generated

Method used

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  • A remodeling soil layered sampling device and sample preparation method thereof
  • A remodeling soil layered sampling device and sample preparation method thereof
  • A remodeling soil layered sampling device and sample preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Embodiment 1: prepare a kind of remodeling soil direct shear sample, diameter 61.8mm, height 20mm, comprise the following steps:

[0060] (1) According to the moisture content of the soil sample required for the test, calculate the amount of water added to the soil material and add water, mix well, put it into a sealed bag and wet it for 24 hours.

[0061] (2) Due to the small height of the direct shear sample, only one layer of sampling is required according to the specifications; according to the dry density and moisture content of the sample required for the test, the mass of the soil sample is calculated and weighed; The inner walls of the mold and base were evenly coated with a layer of petroleum jelly.

[0062] (3) Pour the soil sample that has just been weighed into the three-opening mold and stir it to make it smooth, put the compactor into the three-opening mold, and then put the stopper on the three-opening mold along the dowel rod, so that The limit ring is ...

Embodiment 2

[0065] Embodiment 2: prepare remolded soil triaxial sample, diameter 61.8mm, height 125mm, comprise the following steps:

[0066] (1) According to the moisture content of the soil sample required for the test, calculate the amount of water to be added to a certain soil material and add water, mix well, put it into a sealed bag and wet it for 24 hours.

[0067] (2) The height of the sample that needs to be prepared is 125mm, which can be compacted in five layers, each layer is 25mm; then according to the dry density and water content of the sample required for the test, calculate the quality of each layer of soil sample and weigh it; The inner walls of the three opening molds and the base are evenly coated with a layer of Vaseline.

[0068] (3) Pour the soil sample that has just been weighed into the three-opening mold, put the compactor into the three-opening mold, and then put the stopper on the three-opening mold along the dowel rod, so that the limit ring is just right. Em...

Embodiment 3

[0072] Embodiment 3: According to the "Soil Engineering Test Regulations SL237-1999", the ratio of the height to the diameter of the sample in the triaxial shear test should be 2.0-2.5. For samples with a diameter of 61.8 mm, the height should be 123.6 mm to 154.5 mm, usually 125 mm, 140 mm, 150 mm, etc. For a sample with a height of 125mm, it is Example 2; for a sample with a height of 140mm, it can be divided into 7 layers or 4 layers, each layer is 20mm or 35mm; for a sample with a height of 150mm, it can be divided into 5 layers or 6 layers. Sample, 30mm or 25mm per layer. For samples with a height of 140 mm and 150 mm, the manufacturing steps are similar to those in Example 2, and the combinations of sleeves required for each layer of sample preparation are shown in Table 1 below.

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Abstract

The invention discloses a layered sampling device for remolding soil, which comprises a base, a sample holding mold, a compactor, a limiter, a sleeve and a pressure plate installed in sequence; The soil sample is shot, including the indenter and the dowel rod, the stopper and the sleeve are matched and connected, and then set on the dowel rod. Matching connection; by pre-determining the height of the compacted soil sample and its layered height, use the required sleeve combination to assemble and hit the sample. After the compactor hits the sample, the bottom end surface of the bearing plate and the top of the sleeve Layered sample preparation is realized when the surfaces are connected, and samples can be precisely prepared by changing the specifications and quantities of stacked sleeves. Simple structure, convenient disassembly, simple operation, low cost, long life, not only accurate sample preparation, high efficiency and reliability, can quickly prepare samples of different heights and layers; and can be used repeatedly, by adjusting the pressure head and other components to make Samples of different diameters were obtained.

Description

technical field [0001] The invention relates to a sample preparation device, in particular to a remolded soil layered sampling device and a sample preparation method thereof, belonging to the field of soil engineering test sample preparation in the discipline of civil engineering. Background technique [0002] According to relevant geotechnical test regulations (SL237-1999, JTGE40-2007), the currently commonly used remolded soil sample preparation methods are divided into sample-beating method and sample-compression method. [0003] The sampling method is to calculate the mass of the required wet soil according to the volume of the sample preparation cylinder and the required dry density, pour it into the sample preparation cylinder, and compact the soil sample in one layer or layers; while the compression method is Calculate the mass of wet soil required according to the volume of the sample compactor and the required dry density, pour the wet soil sample into the sample co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28
Inventor 鲁洋许雷刘斯宏王柳江王雅华宋迎俊宗佳敏林亚伟
Owner HOHAI UNIV