Device for measuring pore water pressure in frozen soil

Abstract

A device for measuring the pore water pressure in frozen soil comprises a temperature control box, experimental tanks and an osmometer, wherein the experimental tanks are arranged between a base and a fixing plate, the base and the fixing plate are connected by a fixing member, the top of the experimental tanks is provided with a pressurization head, the upper end of the pressurization head is provided with a pressurization rod and the lower end of the pressurization head is provided with permeable stones, a frozen soil sample is arranged between the base and the permeable stones, and sealing rings are arranged between the experimental tanks and between the experimental tanks and the base. Layered experimental tanks are adopted in the device so that the pressure of pore water in different soil samples and at different heights can be measured in real time. An adopted micro probe is placed in a soil body, pressure in frozen soil is transmitted out of the soil body through a low-temperature nonfreezing pressure transmission medium, and a traditional method in which the pore water pressure is measured on the surface of the soil body is replaced. Therefore, change of the pore water pressure can be measured without the need for the soil body to discharge water. In addition, as the probe is embedded in a cut, the micro probe cannot be damaged due to great deformation of the soil sample, and the problem that the pore water pressure cannot be measured in frozen soil due to the fact that water is frozen after oozing out of the surface of the soil body is solved.

Description

technical field [0001] The invention relates to the field of frozen soil experimental instruments, in particular to a device for measuring pore water pressure in frozen soil. Background technique [0002] In the field of physical and mechanical research of frozen soil, the measurement of pore water pressure has become a key point to explore the deformation mechanism of frozen soil frost heaving, thawing settlement and carry out related calculations. In frozen soil, not all water exists in the form of ice. When the temperature of frozen soil is close to the phase transition point, the volume content of unfrozen water will reach 20%-30% of the total water content. Low, when the unfrozen water in frozen soil is discharged to the surface of the soil under load, it will freeze, so the traditional consolidation test method of measuring pore water pressure on the experimental tank wall cannot be applied to frozen soil. In addition, in traditional soil mechanics experiments, the so...

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Problems solved by technology

[0003] In summary, the object of the present invention is to provide a device for measuring pore water pressure in frozen soil to solve the difficult problem of pore water pressure measurement in frozen soil

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