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Device and method for testing soil deformation and moisture migration characteristics under temperature gradient

A technology of temperature gradient and soil deformation, applied in soil material testing, material inspection products, etc., can solve problems such as no soil deformation research

Active Publication Date: 2015-07-29
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on soil deformation under the action of temperature gradient is still at the qualitative level, that is, the soil shrinks and deforms when it loses water at high temperature, and the soil expands and deforms due to water migration when measured at low temperature. There is no effect on soil deformation. conduct research on a quantitative level

Method used

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  • Device and method for testing soil deformation and moisture migration characteristics under temperature gradient
  • Device and method for testing soil deformation and moisture migration characteristics under temperature gradient
  • Device and method for testing soil deformation and moisture migration characteristics under temperature gradient

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] see Figure 1-6 The device for testing soil deformation and moisture migration characteristics under the action of temperature gradient includes a sample chamber 13, a temperature gradient control device, and a temperature and water content acquisition device. The sample chamber 13 is composed of an inner sleeve 6 , an outer sleeve 7 , an interlayer, an upper cover 18 and a lower cover 1 . On the side of the inner sleeve 6 and the outer sleeve 7, there are four vertical and evenly distributed round holes 23, and the temperature and moisture sensor probes 11 are inserted in the round holes 23. The inner sleeve 6, the outer sleeve 7, the upper cover plate 18 and the lower cover plate 1 are tightly connected into one body by bolts 12 . The temperature gradient control device includes a lower high-temperature water bath 26, an upper low-temperature water bath 15, upper and lower heating chambers 2 placed inside the sample chamber 13, upper and lower heat transfer plates 4 ...

Embodiment 2

[0027] Embodiment 2: This embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0028] see figure 1 with 2 , The inner sleeve 6 and the outer sleeve 7 of the sample chamber 13 in the test device for soil deformation and moisture migration characteristics under the action of temperature gradient of the present invention are made of plexiglass material, forming a double-layer hollow interlayer structure. A thermal insulation material 8 is placed between the inner sleeve 6 and the outer sleeve 7 . The inner sleeve 6 has an inner diameter of 50mm±0.1mm, an outer diameter of 66mm±0.1mm, a height of 150mm±0.1mm, and a wall thickness of 8mm±0.2mm; the outer sleeve 7 has an inner diameter of 84mm±0.1mm and an outer diameter of 100mm± 0.1mm, height 150mm±0.1mm, wall thickness 8mm±0.2mm. There is an annular groove 17 on the inner wall of the inner sleeve 6 at a distance of 15 mm ± 0.1 mm from the upper and lower bottom surfaces, for fixing the h...

Embodiment 3

[0032] Embodiment 3: This embodiment relies on the above-mentioned experimental device for the determination method of soil deformation and water content under temperature gradient, and the experimental steps are as follows:

[0033]1. Installation steps: Place the annular lower cover 1 horizontally, place the lower heating chamber 2 in the concave space of the lower cover 1, and connect the lower heating chamber 2 with the lower high temperature constant temperature water bath 26 with the pipe 24; The rubber ring 5 is embedded in the annular groove 17 at the lower end of the inner wall of the inner sleeve 6, and the lower heat transfer plate 4 is pushed into the inner wall of the inner sleeve 6, so that the rubber ring 5 is inserted into the annular groove 17 in the middle of the heat transfer plate 4, so as to Fix the lower end heat transfer plate 4; insert the rubber pad 9 into the rectangular groove 25 on the inner wall of the inner sleeve 6, then place the inner sleeve 6 o...

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Abstract

The invention discloses a device and method for testing deformation and water transfer characteristics of a soil body under a temperature gradient effect. The device comprises a sample chamber, a temperature gradient control device and a temperature and water content collecting device, wherein the sample chamber comprises an dual-layer hollow organic glass interlayer sleeve and a cover plate; a high-temperature control device and a low-temperature control device are arranged at the upper end and the lower end of the temperature gradient control device respectively, and the temperature gradient control device comprises a constant-temperature water bath, a heating chamber inside the sample chamber, heat transfer plates at two ends of a sample, and a full-closed circulating pipeline. The device for testing the water and temperature of the soil body can be used for testing the water content and the temperature of the soil body synchronously in real time. The device provided by the invention is convenient, simple and light in design, convenient to operate, good in integration performance, and high in testing precision.

Description

technical field [0001] The invention relates to a device and method for testing soil deformation and moisture migration characteristics under the action of a temperature gradient, and belongs to the field of geotechnical engineering measuring instrument manufacturing technology and testing. Background technique [0002] Temperature gradients widely exist in nature. For example, in the deep geological disposal project of high-level radioactive nuclear waste, the nuclear waste in the innermost layer continuously decays to generate higher heat energy, and the surrounding rock barrier located in the outer layer has a lower temperature. The barrier produces a temperature gradient. Under this gradient, the unsaturated high-compacted bentonite used as a buffer / backfill material in the engineering barrier will deform, and at the same time, the moisture in the soil will be redistributed under the action of the temperature gradient. In addition, the cables buried in the ground will ge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24
Inventor 孙文静孙德安于响
Owner SHANGHAI UNIV
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