Stress state-controllable instrument for testing content of unfrozen water in frozen soil

A technology for controlling stress and testing instruments, which is applied in the direction of instruments, scientific instruments, measuring devices, etc., to achieve the effects of stable work, accurate testing, and small fluctuations in temperature changes

Active Publication Date: 2018-08-10
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
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Problems solved by technology

However, most of the existing testing instruments based on these methods measure the unfrozen water content of the soil sample under no load, which is not consistent with the in-situ conditions of the soil sample under a certain stress state.

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  • Stress state-controllable instrument for testing content of unfrozen water in frozen soil
  • Stress state-controllable instrument for testing content of unfrozen water in frozen soil
  • Stress state-controllable instrument for testing content of unfrozen water in frozen soil

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Embodiment Construction

[0035] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", "end", "side" etc. is based on the Orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0036] In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Con...

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Abstract

The invention discloses a stress state-controllable instrument for testing the content of unfrozen water in frozen soil. The instrument comprises an organic glass top cover with an embedded nondestructive TDR probe, the organic glass top cover is arranged in a pressure chamber filled with an antifreeze liquid and is located above a soil sample, the organic glass top cover is connected with a vertical stress loading frame outside the pressure chamber through a loading rod in order to apply a vertical load, the soil sample is connected with a freeze-thaw temperature control system for heat exchange, the antifreeze liquid in the pressure chamber is connected with a hydraulic system in order to apply a confining pressure load, the nondestructive TDR probe is connected with a signal transmitterthrough a coaxial cable, and the dielectric constant of a medium is obtained by a pulse reflection signal in order to determine the content of unfrozen water. The TDR nondestructive probe and the freeze-thaw temperature control system are arranged in a loading system, so the instrument has the advantages of accuracy in stress state control, normality in working, and accuracy in testing the content of the unfrozen water in the frozen soil in different stress states.

Description

technical field [0001] The invention belongs to the technical field of measuring the unfrozen water content of frozen soil, and in particular relates to a testing instrument for the unfrozen water content of frozen soil which can control the stress state. Background technique [0002] China's permafrost area accounts for 22.3% of the country's land area, ranking third in the world. A thorny problem in infrastructure construction in permafrost regions is the frost heaving and thawing of soil samples, such as the uneven settlement of road and railway subgrades after freezing and thawing, and the inclination deformation of building foundations after freezing and thawing. Frost heaving and thawing of soil samples are caused by the phase change of liquid water and solid ice in the pores under the action of temperature, which leads to the change of soil sample volume. According to the existing research, with the decrease of temperature, the freezing of liquid water in soil sample...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/22
CPCG01N27/221G01N27/223
Inventor 穆青翼吴宏伟周超廖红建周公旦
Owner XI AN JIAOTONG UNIV
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