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Method for repeatedly imitating soil samples by heating and volatilizing organic material skeleton based on 3D printing technology

An organic material, 3D printing technology, applied in the preparation of test samples, etc.

Active Publication Date: 2019-05-07
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The physical and chemical parameters obtained from the undisturbed soil can truly reflect the properties of the soil sample, so experimenters often use undisturbed soil samples for testing, but the disadvantage is that undisturbed soil samples cannot be used for repeatability tests, and it is often impossible to ensure that the obtained results are consistent with the real indicators. The difference is within a reasonable range

Method used

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  • Method for repeatedly imitating soil samples by heating and volatilizing organic material skeleton based on 3D printing technology
  • Method for repeatedly imitating soil samples by heating and volatilizing organic material skeleton based on 3D printing technology
  • Method for repeatedly imitating soil samples by heating and volatilizing organic material skeleton based on 3D printing technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: General method for preparing imitation soil samples

[0031] see Figure 1-Figure 3 , using 3D printing technology to repeat the method of imitating soil samples by heating up the volatilized organic material skeleton, the specific operation steps are as follows

[0032] 1. Preparation of undisturbed soil samples

[0033] (1) Take soil

[0034] The choice of drilling method should first consider avoiding excessive disturbance to the soil due to tool vibration during the drilling process. Measures such as mud hole protection can be used. The diameter and depth of the borehole should be appropriate, and a certain hydrostatic pressure should be ensured to prevent the soil from becoming soft during the soil extraction process. During the soil extraction process, under the premise of minimizing soil disturbance and maintaining the natural state and structure of the soil, use drilling tools to select soil samples at a predetermined depth; the soil samples shoul...

Embodiment 2

[0047] Implementation Example 2: Using Different Organic Materials as Soil Skeleton

[0048] (1) Obtain undisturbed soil samples

[0049] (1-1) Use a reasonable drilling method to take out a cylindrical undisturbed soil sample of a certain size without major disturbance.

[0050] (1-2) The soil samples taken in the field cannot be sent to the laboratory immediately, so the soil samples that cannot be tested immediately should be properly preserved. The environment for storing soil samples should meet the temperature and humidity requirements, and the sample box should be sealed tightly to avoid wind, rain, sun exposure, freezing, etc.

[0051] (1-3) Determination of the physical and mechanical indicators of the undisturbed soil sample according to the method steps in the "Code for Geotechnical Testing", such as measuring the moisture content of the soil by the drying method, measuring the specific gravity of the soil by the pycnometer method, etc.

[0052] (2) Imitate the so...

Embodiment 3

[0062] Implementation Example 3: Manufactured soil samples with different shapes and sizes

[0063] (1) Obtain undisturbed soil samples

[0064] The implementation is the same as the method in Example 1.

[0065] (2) Production method

[0066] Soil samples can be made with a soil cutter in the laboratory, and this patent can also make soil samples of other shapes (such as squares) and sizes as required, as long as they can be placed under the CT scanner and all can be scanned by the CT scanner. After obtaining the pore structure of the soil by CT scanning, 3D printing technology is used to use organic materials as 3D printing materials to print out the pore structure skeleton of different soils. Then, according to the physical and mechanical indicators of the undisturbed soil and following the principle of equal moisture content, ice particles and soil particles with different gradations are produced by granulation technology. Pour the ice particles and soil particles into ...

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Abstract

The invention discloses a method for repeatedly imitating soil samples by heating and volatilizing organic material skeleton based on 3D printing technology. The method comprises the following steps:scanning an undisturbed soil sample with a CT device to obtain the pore structure of the sample; establishing the pore structure of the undisturbed soil by image processing and integrating it into a 3D model; using a high-strength, volatile organic material as a 3D printing material to prepare a pore structure skeleton of the undisturbed soil sample; uniformly mixing ice particles and soil particles obtained by the granulation technique after the 3D pore structure skeleton of the soil is formed and stabilized; pouring the mixture into the pore structure skeleton, and performing vibration so that the particles all enter the pore structure skeleton; heating to melt the ice particles, wherein the temperature is lower than the boiling point of the organic material; uniformly mixing the soil and the water; and heating the mixture to the boiling point of the organic material after the mixture is stabilized, so that the organic material is volatilized from the pore structure to form a soil sample having the same pore distribution as the original soil sample. By repeating the above steps, a plurality of parallel samples having the same pore structure can be prepared.

Description

technical field [0001] The invention relates to a method for repeatedly imitating soil samples by using 3D printing technology to volatilize the skeleton of organic materials by heating. Background technique [0002] The physical and chemical parameters obtained from the undisturbed soil can truly reflect the properties of the soil sample, so experimenters often use undisturbed soil samples for testing, but the disadvantage is that undisturbed soil samples cannot be used for repeatability tests, and it is often impossible to ensure that the obtained results are consistent with the real indicators. The difference is within a reasonable range. At present, remolded soil samples are usually used to obtain various indicators of soil, but the pore distribution of remolded soil samples is quite different from that of the original soil. The pore structure of the soil has a very important influence on the engineering properties of the soil such as permeability, deformation and stren...

Claims

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Application Information

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IPC IPC(8): G01N1/28
Inventor 孙文静刘孝阳刘成黄继忠
Owner SHANGHAI UNIV
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