Combined testing device and method for measuring matrix suction and thermal conductivity of unsaturated soil

A technology of matrix suction and combined testing, which is applied in soil material testing, material thermal development, material inspection products, etc., can solve problems such as low control accuracy and cumbersome measurement process, achieve high degree of automation, broad application prospects, and save measurement costs Effect

Pending Publication Date: 2019-01-25
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

Traditional tensiometers are widely used in the on-site measurement of matrix suction, and the suction measurement using traditional tensiometers is limited to 85kPa; the axis translation technology needs to manually adjust the air pressure of the pressure plate, the control accuracy is low, and the measurement process is cumbersome

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  • Combined testing device and method for measuring matrix suction and thermal conductivity of unsaturated soil
  • Combined testing device and method for measuring matrix suction and thermal conductivity of unsaturated soil
  • Combined testing device and method for measuring matrix suction and thermal conductivity of unsaturated soil

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Embodiment Construction

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0029] Please refer to figure 1 with figure 2 , the embodiment of the present invention discloses a combined test device for measuring the suction and thermal conductivity of unsaturated soil matrix, including a water storage tank, a controller and a pressure chamber, the pressure chamber includes a side wall, fixed on the side The cover plate at the top of the wall and the bottom plate fixed at the bottom of the side wall. In this embodiment, the side wall is made of plexiglass side wall, the bottom plate can be a stainless steel bottom plate, the cover plate can be a stainless steel cover plate, and the stainless steel bottom plate to stainless steel The vertical height of the cover plate is 200mm, the inner diameter of the plexiglass side wall is 17...

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Abstract

The invention relates to a combined testing device and method for measuring matrix suction and thermal conductivity of unsaturated soil. The device mainly comprises a water storage tank, a water pressure chamber, a gas pressure chamber, a clay plate, a water pressure sensor, a controller, a pneumatic regulating valve, a thermal sensor and the like. The testing method includes the steps of first placing the thermal sensor in a cylindrical soil sample with a hole formed in advance; second placing the soil sample in the water pressure chamber, opening the controller to control the pneumatic regulating valve according to data received by a water pressure reader to ensure that the water pressure under the clay plate is +/-10 kPa and recording and saving the data of the thermal sensor through athermal conductivity reader; finally calculating the matrix suction of the soil sample according to the measured air pressure, water pressure and the data measured by the thermal sensor. The testing device has the advantages of large range, high precision and high degree of automation for measuring the matrix suction of the unsaturated soil. The obtained thermal conductivity also has the characteristic of verifying the matrix suction.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering unsaturated soil matrix suction and thermal conductivity, in particular to a combined testing device and method for measuring unsaturated soil matrix suction and thermal conductivity. Background technique [0002] In the natural state, most soils are in an unsaturated state, and the basic engineering properties of unsaturated soils are closely related to the stability of structures, which deserves close attention in engineering practice. [0003] Matric suction is one of the parameters to evaluate the properties of unsaturated soil, which has an important influence on its strength characteristics, permeability characteristics and heat conduction characteristics; for unsaturated soil, with the change of soil moisture content, the matric suction will also produce corresponding Change. The relationship curve between matric suction and water content of soil is called the soil-water c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20G01N33/24
CPCG01N25/20G01N33/24
Inventor 张涛王才进陈杨
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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