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Test probe for monitoring pore water pressure in frozen soil

A technology of pore water pressure and frozen soil, applied in the direction of measuring fluid pressure, measuring devices, instruments, etc., can solve the problems of freezing of force-transmitting medium, failure of probe, inability to apply pore water pressure test, etc., to achieve the effect of convenient use

Inactive Publication Date: 2017-12-01
COLD & ARID REGIONS ENVIRONMENTAL & ENG RES INST CHINESE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a negative temperature environment, the force transmission medium (liquid water) in the tensiometer freezes, which will lead to the failure of the probe. Therefore, the traditional pore water pressure testing technology in thawing soil cannot be applied to the pore water pressure in frozen soil. test

Method used

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  • Test probe for monitoring pore water pressure in frozen soil

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Embodiment Construction

[0016] Such as figure 1 As shown, a test probe for monitoring pore water pressure in frozen soil, the probe includes clay head 1, hard plastic pipe 2, pressure sensor 5 and adapter 6. The pressure sensor 5 is connected with the adapter 6, and the adapter 6 is connected with one end of the hard plastic pipe 2 through the quick joint 3; the other end of the hard plastic pipe 2 is bonded with the clay head 1; A vent hole is provided with a nut 4 on the vent hole.

[0017] Wherein: the pressure sensor 5 is connected with the adapter 6 through a screw thread.

[0018] The probe cavity formed by clay head 1, hard plastic pipe 2, adapter 6 and pressure sensor 5 is filled with alcohol.

[0019] Working steps of the present invention:

[0020] (1) Saturation before the test:

[0021] Inject alcohol into the hard plastic tube 2 with clay head 1, connect the hard plastic tube 2 to the adapter 6 through the quick connector 3 after filling, then inject alcohol into the adapter 6, and t...

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Abstract

The invention relates to a test probe for monitoring the pore water pressure in frozen soil. The probe includes a clay head, a rigid plastic pipe, a pressure sensor and an adapter. The pressure sensor is connected with the adapter, and the adapter is connected with one end of the rigid plastic pipe through a quick connector. The other end of the rigid plastic pipe is bonded to the clay head. The adapter is provided with an air vent, and a nut is arranged on the air vent. The test probe is stable, reliable and convenient to use, and can be used to monitor the change of pore water pressure in the soil freezing process so as to provide a basis for analyzing the moisture migration and ice condensation process of soil during freezing and thawing.

Description

technical field [0001] The invention relates to a test equipment required for testing the internal variables of soil mechanics during the freezing and thawing process of the soil, in particular to a test probe for monitoring pore water pressure in frozen soil. Background technique [0002] Frost heaving and thawing are the two most important diseases of engineering construction in cold regions, which have brought great harm to engineering construction and operation in cold regions. Moisture migration and ice segregation are the most fundamental causes of frost heaving and thawing deformation. During the freezing process of the soil, the soil will form layered segregated ice, resulting in frost heave. Moreover, when the temperature is lower than the freezing point of water, there is still a certain amount of unfrozen water in the soil, and the pore water pressure at the ice segregation front will drop, which will cause water to flow through the unfrozen water film under the ...

Claims

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Application Information

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IPC IPC(8): G01L11/00
CPCG01L11/006
Inventor 杨成松张莲海马巍王丹
Owner COLD & ARID REGIONS ENVIRONMENTAL & ENG RES INST CHINESE
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