AU2020103784A4

AU2020103784A4 - 3D printing device capable of controlling temperature field and used for testing diffusion coefficient of soil body

Info

Publication number: AU2020103784A4
Application number: AU2020103784A
Authority: AU
Inventors: Yuzhang Bi; Yanjun DU; Xianlei FU; Zheyuan Jiang; Xinpo Sun; Haoliang Wu
Original assignee: Bizhao Geotechnical Technology Nanjing Co Ltd; Southeast University
Current assignee: Bizhao Geotechnical Technology Nanjing Co Ltd; Southeast University
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-02-11
Anticipated expiration: 2028-11-30

Abstract

The invention discloses a 3D printing device capable of controlling temperature field and used for testing the diffusion coefficient of soil body, which comprises a diffusion chamber and a temperature field generator arranged on the upper part of the diffusion chamber, wherein the upper part of the diffusion chamber is provided with an annular baffle plate used for placing the annular knife for sampling. The temperature field generator comprises a shell, upper and lower groups of water bath pipes are arranged in the shell. The upper water bath pipe is respectively connected with an upper layer liquid inlet and an upper layer liquid outlet; the lower water bath pipe is respectively connected with a lower layer liquid inlet and a lower layer liquid outlet. The diffusion chamber is connected with a gas inlet and a gas outlet; and a layer for heat preservation is arranged outside the diffusion chamber. The invention can be used for researching the gas diffusion blocking performance of the soil body under the action of the temperature field. 1/2 Figures 4 F 6 5 7 3 9 8 10 12 FIGURE 1

Description

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Figures

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FIGURE 1

3D printing device capable of controlling temperature field and used for testing diffusion coefficient of soil body

TECHNICAL FIELD

The invention relates to a 3D printing device capable of controlling temperature field and used for testing the diffusion coefficient of soil body, and belongs to the technical field of civil and environmental engineering.

BACKGROUND

With the aggravation of urban pollution, landfill method has been widely used in the treatment of various pollutants. In practical engineering, the engineering cover soil is usually covered above the landfill to prevent the lower polluted gas from diffusing to the surrounding environment so as to pollute the surrounding environment. The gas diffusion coefficient of engineering covered soil is generally used for evaluating the capability of blocking the polluted gas, but the temperature gradient of the environment of the engineering covered soil has seasonal variation. The high temperature condition in summer can cause the water loss and cracking of the engineering covered soil, so that the diffusion coefficient of the engineering covered soil is reduced, and the blocking performance becomes poor. Meanwhile, the existence of the temperature gradient can cause the solute to diffuse, the thermal diffusion effect is commonly called as the Soret effect. The essence of the thermal diffusion effect is that the concentration gradient of the solute is changed due to the temperature gradient, so that the molecular diffusion phenomenon is generated. Therefore, it is very necessary to develop an instrument to study the gas diffusion barrier of soil body under the action of temperature field.

SUMMARY

The invention aims to provide a 3D printing device which can control the temperature field and is used for testing the diffusion coefficient of the soil body, and the 3D printing device can be used for researching the gas diffusion blocking performance of the soil body under the action of the temperature field.

The above object of the present invention can be achieved by the following technical scheme:

The invention discloses a 3D printing device capable of controlling temperature field and used for testing the diffusion coefficient of soil body, which comprises a diffusion chamber and a temperature field generator arranged at the upper part of the diffusion chamber, wherein the upper part of the diffusion chamber is provided with an annular baffle plate used for placing the annular knife for sampling; the temperature field generator comprises a shell, an upper water bath pipe and a lower water bath pipe are arranged in the shell. The upper water bath pipe is respectively connected with an upper layer liquid inlet and an upper layer liquid outlet. The lower water bath pipe is respectively connected with a lower layer liquid inlet and a lower layer liquid outlet. The diffusion chamber is connected with a gas inlet and a gas outlet, and a layer for heat preservation is arranged outside the diffusion chamber.

For the 3D printing device capable of controlling temperature field and used for testing the diffusion coefficient of soil body recited, the upper layer liquid inlet, the upper layer liquid outlet, the lower layer liquid inlet and the lower layer liquid outlet are respectively provided with the joints which are used for being connected with the water pipes of the circulating water pump.

For the 3D printing device capable of controlling temperature field and used for testing the diffusion coefficient of soil body recited, the gas inlet and the gas outlet are provided with threads used for connecting valves.

The invention has the beneficial effects that:

The invention provides a temperature field for the soil sample, and measures the gas diffusion coefficient in the soil body under the action of the temperature field so as to simulate the condition that the soil body has the temperature field in practical application. And the structure of the whole instrument is simple. In addition, the instrument is manufactured by 3D printing, and the whole instrument is only divided into a shell and a soil sample container, so that the splicing joint is greatly reduced. Due to the accurate and controllable characteristic of 3D printing, the connecting parts of the two parts have an extremely high matching degree, so that the tightness of the experiment process is ensured. The annular baffle plate allows the soil sample to still support the soil sample after water loss and shrinkage. Finally, the size of the soil sample container is the same as that of the annular knife, and an annular knife sample can be directly placed in the soil sample container, so that the prepared sample is convenient and reliable.

BRIEF DESCRIPTION OF THE FIGURES

Figure 1 is a schematic structural diagram of the present invention.

Figure 2 is a top view of the present invention.

The reference number in the figure is as follows: 1. a diffusion chamber; 2. a temperature field generator; 3. an annular baffle plate; 4. an upper water bath pipe; 5. an upper layer liquid inlet; 6. an upper layer liquid outlet; 7. a lower water bath pipe; 8. a lower layer liquid inlet; 9. a lower layer liquid outlet; 10. a gas inlet; 11. a gas outlet; and 12. a layer for heat preservation.

DESCRIPTION OF THE INVENTION

The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments thereof.

The 3D printing device capable of controlling the temperature field and used for testing the diffusion coefficient of the soil body comprises a diffusion chamber 1 and a temperature field generator 2 arranged on the upper part of the diffusion chamber. Wherein the upper part of the diffusion chamber is provided with the annular baffle plate 3 used for placing an annular knife sample. The temperature field generator comprises a shell, and the upper water bath pipe 4 and the lower water bath pipe are arranged in the shell. The upper water bath pipe 4 is respectively connected with the upper layer liquid inlet 5 and the upper layer liquid outlet 6, the lower water bath pipe 7 is respectively connected with the lower layer liquid inlet 8 and the lower layer liquid outlet 9. The diffusion chamber is connected with the gas inlet 10 and the gas outlet 11. The layer for heat preservation 12 is arranged outside the diffusion chamber. In the embodiment, a certain distance is kept between the upper water bath tube and the lower water bath tube to ensure the upper and lower temperature differences. In the arrangement of the baffle 3, the annular knife filled with the soil sample can be directly placed on the baffle, and the soil sample with uneven edges can be ignored. In addition, the presence of the baffle 3 prevents the soil sample from shrinking and slipping after slight water loss.

In order to avoid the obvious difference between soil sample water loss and initial water content during the test, even the diffusion coefficient is not consistent with the actual working condition due to the crack caused by water loss shrinkage. A humidifier is used to control the moisture content of soil samples during the test.

Working principle and working process:

The instrument provides a temperature field for a soil sample and measures the gas diffusion coefficient of the soil body under the action of the temperature field so as to simulate the condition that the soil body has the temperature field in actual engineering (such as the effect of blocking landfill gas under the conditions of spring, summer, autumn and winter), and the structure of the whole instrument is simple. In addition, the instrument is manufactured by 3D printing, and the whole instrument is only divided into a shell and a soil sample container, so that the splicing joint is greatly reduced. Due to the accurate and controllable characteristic of 3D printing, the connecting parts of the two parts have an extremely high matching degree, so that the tightness of the experiment process is ensured. The annular baffle plate allows the soil sample to still support the soil sample after water loss shrinkage under the influence of a temperature field. Finally, the size of the soil sample container can be directly put into the soil sample container by using an annular knife for sampling, so that the prepared sample is convenient and reliable, and the in-situ soil sample can be directly taken from the site by using the annular knife for testing.

The foregoing description of the embodiments is provided to facilitate the understanding and application of the present invention by those of ordinary skill in the art. It will be apparent to those skilled in the art that various modifications may be readily made to these embodiments and that the generic principles described herein may be applied to other embodiments without creative effort. Accordingly, the present invention is not limited to the embodiments herein, and it is intended that those skilled in the art, in light of the disclosure of the present invention, make modifications and alterations without departing from the scope of the present invention, which are within the scope of the present invention.

Claims

1. For the 3D printing device capable of controlling temperature field and used for testing the diffusion coefficient of soil body recited, wherein the device comprises a diffusion chamber and a temperature field generator arranged at the upper part of the diffusion chamber. The upper part of the diffusion chamber is provided with an annular baffle plate used for placing the annular knife for sampling. The temperature field generator comprises a shell. The upper water bath pipe and the lower water bath pipe are arranged in the shell. The upper water bath pipe is respectively connected with the upper layer liquid inlet and the upper layer liquid outlet, and the lower water bath pipe is respectively connected with the lower layer liquid inlet and the lower layer liquid outlet. The diffusion chamber is connected with the gas inlet and the gas outlet, and the layer for heat preservation is arranged outside the diffusion chamber.

2. The 3D printing device is capable of controlling temperature field and used for testing the diffusion coefficient of the soil body according to claim 1, wherein the upper layer liquid inlet, the upper layer liquid outlet, the lower layer liquid inlet and the lower layer liquid outlet are respectively provided with the joints used for being connected with the water pipes of the circulating water pump.

3. The 3D printing device is capable of controlling temperature field and used for testing the diffusion coefficient of the soil body according to claim 1, wherein the gas inlet and the gas outlet are provided with threads for connecting valves.

Figures 1/2

FIGURE 1