Device and method for measuring frozen soil pore water pressure
A pore water pressure and measuring device technology, which is applied in the direction of measuring devices, measuring fluid pressure, instruments, etc., can solve problems such as failure to work, pressure-sensitive membrane damage, etc., and achieve the effect of simple structure and reliable measurement
Inactive Publication Date: 2013-01-16
CHINA GEOKON INSTR
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Problems solved by technology
[0005] The present invention aims at the problem that the traditional pressure measuring device used for measuring the pore water pressure of frozen soil cannot work under 0°C due to the damage of the pressure sensing membrane, and provides a new type of measuring device for the pore water pressure of frozen soil. It can still work normally below 0°C, and has the advantages of simple structure and reliable measurement
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[0024] The present invention will be described below in conjunction with the accompanying drawings.
[0025] The invention discloses a device for measuring pore water pressure in frozen soil, the schematic diagram of which is as follows figure 2 As shown, it includes a filter probe 21, a communication pipe 22, a sealed cavity 24, a pressure sensor 25 and a signal cable 26 connected in sequence. One end of the communication pipe 22 communicates with the filter probe 21, and the other end of the communication pipe 22 is connected to the sealing chamber. The top of the cavity 24 communicates with the inside of the sealed cavity 24, and the sealed cavity 24 and the communication pipe 22 are filled with the force transmission liquid 23, which is denser than water and insoluble in water and insoluble in the required low temperature range. A liquid that freezes. The pressure sensor 25 is fixed on the bottom of the sealed cavity 24 , and the pressure sensing film of the pressure sen...
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The invention relates to a device and a method for measuring frozen soil pore water pressure. The device comprises a filter probe, a communication tube, a seal cavity, a pressure sensor and a signal cable which are connected successively. One end of the communication tube is communicated with the filter probe, and the other end of the communication tube is connected and communicated with the top of the seal cavity. Transmission liquids are filled in the seal cavity and the communication tube and are liquids which are larger than water in density, insoluble in water and not frozen in a required low temperature range. The pressure sensor is fixed at the bottom of the seal cavity, pressure induction film of the pressure sensor is communicated with the interior of the seal cavity, and an output end of the pressure sensor is connected with the signal cable. The device can work normally when the environment temperature is lower than 0 DEG C and has the advantages of simple structure and reliable measurement.
Description
technical field [0001] The invention relates to the technical field of rock and soil safety monitoring, in particular to a device and method for measuring pore water pressure of frozen soil in a low-temperature environment, which can measure pore water pressure of plateau frozen soil, earth-rock dams, roads, side slopes and backfilled soil. Background technique [0002] After the soil in geotechnical engineering is frozen, not all the liquid water in the soil turns into solid ice. Due to the effect of the particle surface energy, a certain amount of liquid water remains in it, which is called unfrozen water. High-temperature frozen soil, also known as near-phase-transition frozen soil, is usually used to describe frozen soil with a relatively high temperature (-1.5°C to 0°C) in a low-temperature environment. It is widely accepted that high-temperature frozen soil has a high content of frozen water. Because its temperature range is in the severe phase transition region of fr...
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Login to View More IPC IPC(8): G01L11/00G01L19/06
Inventor 谭斌沈省三
Owner CHINA GEOKON INSTR