CN202836859U - Measurement device for frozen earth pore water pressure - Google Patents
Measurement device for frozen earth pore water pressure Download PDFInfo
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- CN202836859U CN202836859U CN 201220518132 CN201220518132U CN202836859U CN 202836859 U CN202836859 U CN 202836859U CN 201220518132 CN201220518132 CN 201220518132 CN 201220518132 U CN201220518132 U CN 201220518132U CN 202836859 U CN202836859 U CN 202836859U
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- pressure transducer
- pore water
- frozen soil
- pressure
- measurement device
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- Measuring Fluid Pressure (AREA)
Abstract
The utility model relates to a measurement device for frozen earth pore water pressure. The measurement device for the frozen earth pore water pressure comprises a filter probe, a communicating pipe, a sealed cavity body, a pressure sensor and a signal cable, wherein the filter probe, the communicating pipe, the sealed cavity body, the pressure sensor and the signal cable are connected in sequence. One end of the communicating pipe is communicated with the filter probe, and the other end of the communicating pipe is connected with the top portion of the sealed cavity body and is communicated with the top portion of the sealed cavity body. The sealed cavity body and the communicating pipe are full of conveying force liquid. The density of the conveying force liquid is larger than the density of water, and the conveying force liquid is liquid which is insoluble in the water and is free from freeze within a scope of required low temperature. The pressure sensor is fixed at the bottom of the sealed cavity body, a pressure sensing film of the pressure sensor is communicated with the interior of the sealed cavity body, and an output end of the pressure sensor is connected with the signal cable. The measurement device for the frozen earth pore water pressure can still work normally under the condition that the environment temperature is lower than 0 DEG C and has the advantages of being simple in structure and reliable in measurement.
Description
Technical field
The utility model relates to ground safety monitoring technology field, and particularly the frozen soil pore water pressure measurement device under low temperature environment can carry out the pore water pressure of plateau permafrost, earth and rockfill dam, highway, side slope and the backfill soil body and measure.
Background technology
Behind the freezing soil of Geotechnical Engineering, be not that aqueous waters all in the soil body all is transformed into solid-state ice, because the effect of particle surface energy, the aqueous water that is wherein remaining some is called and does not freeze water.High Temperature Permafrost claims again nearly phase change zone frozen soil, is commonly used to describe under the low temperature environment the relatively frozen soil of high-temperature (1.5 ℃～0 ℃), and widely accepted is that High Temperature Permafrost has the water that do not freeze of high level.Because its temperature range is in the violent phase change zone of frozen soil, freezes soil water and does not freeze the ratio of water to variation and the sensitivity thereof of temperature, therefore the physics character of High Temperature Permafrost has strong instability.Simultaneously, because the water in the frozen soil is not pure water, wherein be dissolved with the solute of variable concentrations, therefore, freeze the also corresponding reduction of freezing point of soil water.In the High Temperature Permafrost of relative temperature higher (1.5 ℃～0 ℃), aqueous water has considerable magnitude, and its volumetric(al) moisture content can reach 10%～15%.Because a large amount of existence of not freezing water have positive effect by measuring frozen Pore Pressure and Changing Pattern thereof to the characteristics such as mechanics of studying frozen soil.
At present in ground safety monitoring industry, measure then can cause device for pressure measurement to damage if adopt traditional device for pressure measurement to carry out frozen soil pore water pressure under the low temperature environment.The structure of traditional device for pressure measurement comprises filtrator 11, cavity 12, pressure transducer 15, shell 16 and cable 17 as shown in Figure 1, and pressure transducer 15 comprises pressure sensitive film 13 and is installed in sensitive element 14 on the pressure sensitive film 13.Liquid in the frozen soil hole (being water) enters cavity 12 by filtrator 11, and the fluid pressure direct effect is sensed fluid pressure and is converted into electric signal by cable 17 outputs by sensitive element 14 by pressure sensitive film 13 to pressure sensitive film 13.
Traditional device for pressure measurement directly places the environment that needs to measure fluid pressure usually, as is embedded in the soil body, or places other to comprise the environment such as the soil body, rock, well, boring and pipeline, is used for directly monitoring the pressure of water or pore water.But, nearly all device for pressure measurement all can only work in the water environment more than 0 degree centigrade, when if the environment temperature of monitored point is lower than 0 degree centigrade, water in the cavity of device for pressure measurement will freeze, and water volume after freezing will produce the also squeeze pressure sense film 13 that expands, thereby cause pressure sensitive film 13 to produce mechanically deform, therefore do not cause permanent damages even behind ice-out, can not return to original state yet, can't carry out again all later on that the frozen soil pore water pressure is measured or can not Measurement accuracy.Therefore, be used for the environment that traditional device for pressure measurement of measuring frozen pore water pressure can only work in more than 0 ℃ usually and just be unlikely damage.Yet, some extremely frigid zones such as the tundras such as Qinghai-Tibet Platean, some areas, northeast or other freeze thawing circulation environment under, to such an extent as to will reducing with environment temperature, the frozen soil pore water freezes, when water after traditional device for pressure measurement internal induction freezes, all can occur to cause pressure transducer to damage the problem that can't work because of the expansion of ice.
The utility model content
The utility model is measured for present frozen soil pore water pressure and is adopted traditional device for pressure measurement to cause the problem that can't work owing to the pressure sensitive film damages in meeting below 0 ℃, a kind of novel frozen soil pore water pressure measurement device is provided, this device is lower than 0 ℃ in environment temperature and still can works, have simple in structure, measure reliable advantage.
The technical solution of the utility model is as follows:
A kind of frozen soil pore water pressure measurement device, it is characterized in that, comprise the filtrator probe that connects successively, communicating pipe, seal chamber, pressure transducer and signal cable, the end of described communicating pipe communicates with the filtrator probe, the other end of communicating pipe connects the top of seal chamber and communicates with the inside of seal chamber, described seal chamber and be full of power transmission liquid in communicating pipe, described power transmission liquid be density greater than water and water insoluble and in the low temperature range that requires not congelative liquid, described pressure transducer is fixed in the bottom of seal chamber, and the pressure sensitive film of described pressure transducer communicates with seal chamber inside, and the output terminal of pressure transducer links to each other with signal cable.
Described filtrator probe is the stainless steel sintering probe of porous ceramics probe or porous, and described filtration is popped one's head in and intercepted fine particle in the frozen soil hole by porous.
The long-pending shaft section less than seal chamber of the shaft section of described communicating pipe is long-pending.
The low temperature range of described requirement is-50 ℃ ~ 0 ℃, and described power transmission liquid is not congelative liquid when being low to moderate-50 ℃ in temperature.
Described power transmission liquid is methenyl choloride or decane.
Described pressure transducer is steel chord type pressure transducer or piezoresistive pressure sensor or fiber Bragg grating type pressure transducer or resistance-strain chip pressure transducer or differential resistance type pressure transducer or capacitance pressure transducer, or differential capacitance type pressure transducer.
Described signal cable is low temperature resistant cable or low temperature resistant fiber.
Technique effect of the present utility model is as follows:
The frozen soil pore water pressure measurement device that the utility model relates to, comprise the filtrator probe that connects successively, communicating pipe, seal chamber, pressure transducer and signal cable, the granule foreign that filtrator probe can intercept beyond dewatering in the frozen soil hole is set enters the utility model measurement mechanism, after the frozen soil pore water pressure is popped one's head in through filtrator, because seal chamber and be full of power transmission liquid in communicating pipe, power transmission liquid be density greater than water and water insoluble and in the low temperature range that requires not congelative liquid, therefore power transmission liquid of the present utility model can effectively stop the water of frozen soil hole to enter seal chamber, so that the water of frozen soil hole swims in power transmission liquid top, power transmission liquid is delivered to the frozen soil pore water pressure on the pressure sensitive film of pressure transducer, pressure transducer sends out the size of frozen soil pore water pressure through signal cable, thereby finishes frozen soil pore water pressure force measurement.The power transmission liquid of device described in the utility model not only transmits the frozen soil pore water pressure; the contacting of pressure sensitive film that can also stop water and pressure transducer; like this; when freezing even environment temperature reaches the condition that is enough to make water freezing; because power transmission liquid can not freeze; therefore can not contacting and have influence on the pressure sensitive film of pressure transducer, water freezing do not cause its mechanicalness to be damaged; thereby protected pressure transducer; overcome present traditional device for pressure measurement and can cause the problem that to work again because the pressure sensitive film damages below 0 ℃; device described in the utility model can be in the tundra or the normal operation of freeze thawing circulation environment; power transmission liquid can be delivered to pressure transducer fully with the frozen soil pore water pressure; the signal of Obtaining Accurate frozen soil pore water pressure is finished at the frozen soil pore water pressure of tundra in the protection pressure transducer and is measured.That the utility model device has advantages of is simple in structure, measure reliable and long service life, and has filled up the blank that the frozen soil pore water pressure is measured.
Description of drawings
Fig. 1 is the structural representation of traditional device for pressure measurement.
Fig. 2 is the structural representation of the utility model frozen soil pore water pressure measurement device.
Each label lists as follows among the figure:
The 11-filtrator; The 12-cavity; 13-pressure sensitive film; The 14-sensitive element; The 15-pressure transducer; The 16-shell; The 17-cable; 21-filtrator probe; 22-communicating pipe; 23-power transmission liquid; The 24-seal chamber; The 25-pressure transducer; The 26-signal cable.
Embodiment
Below in conjunction with accompanying drawing the utility model is described.
The utility model discloses a kind of frozen soil pore water pressure measurement device, its structural representation as shown in Figure 2, comprise the filtrator probe 21, communicating pipe 22, seal chamber 24, pressure transducer 25 and the signal cable 26 that connect successively, the end of communicating pipe 22 communicates with filtrator probe 21, the other end of communicating pipe 22 connects the top of seal chamber 24 and communicates with the inside of seal chamber 24, seal chamber 24 and be full of power transmission liquid 23 in communicating pipe 22, this power transmission liquid be density greater than water and water insoluble and in the low temperature range that requires not congelative liquid.Pressure transducer 25 is fixed in the bottom of seal chamber 24, and the pressure sensitive film of pressure transducer 25 communicates with seal chamber 24 inside, and the output terminal of pressure transducer 25 links to each other with signal cable 26.
In device described in the utility model, the filtrator probe 21 preferred probes that adopt porous structure, as adopt the sintered stainless steel of porous ceramics probe or porous to pop one's head in, the porous ceramics probe can adopt the probe of the porous structure of aluminium oxide ceramics material, porous described here is a plurality of micropores, and the fine particle that is used for obstruct frozen soil hole enters device described in the utility model.
As shown in Figure 2, the upper end of communicating pipe 22 connects filtrator probe 21 communicating with external environment, and except communicating pipes 22 upper ends, device described in the utility model is hermetically-sealed construction.Communicating pipe 22 connects filtrator probe 21 and seal chamber 24, the purpose that communicating pipe 22 is set is convenient operation and filtrator probe 21 and seal chamber 24 is installed, the long-pending shaft section less than seal chamber 24 of the shaft section of preferred communicating pipe 22 is long-pending, like this, the frozen soil pore water pressure that enters long-pending little communicating pipe 22 of shaft section can be more concentrated, so that power transmission liquid 23 can be passed to this frozen soil pore water pressure the pressure sensitive film of pressure transducer 25 better fully.
Frozen soil pore water pressure measurement device described in the utility model in use, the utility model device that will be full of power transmission liquid 23 is embedded in the frozen soil soil body of measured environment, and keeps filtrator probe 23 up, namely vertically buries underground as shown in Figure 2.The frozen soil pore water of the utility model frozen soil pore water pressure measurement device surrounding enviroment or frozen water pressure also were delivered to by power transmission liquid 23 on the pressure sensitive film of pressure transducer 25 through filter probe 21, communicating pipe 22, and its frozen soil pore water or frozen water pressure size are sent on the data acquisition equipment record at a distance by signal cable 26 or show.
Device described in the utility model can be realized automatically measuring in the environment of frozen soil environment or freeze thawing circulation; each parts that need not will be embedded in the soil body because worry the pressure transducer physical damage take out, and this device can be finished at the frozen soil pore water pressure of tundra in the protection pressure transducer and measure.
Should be pointed out that the above embodiment can make the invention of those skilled in the art's comprehend, but do not limit the present invention in any way creation.Therefore; although this instructions has been described in detail the invention with reference to drawings and Examples; but; those skilled in the art are to be understood that; still can make amendment or be equal to replacement the invention; in a word, all do not break away from technical scheme and the improvement thereof of the spirit and scope of the invention, and it all should be encompassed in the middle of the protection domain of the invention patent.
Claims (7)
1. frozen soil pore water pressure measurement device, it is characterized in that, comprise the filtrator probe that connects successively, communicating pipe, seal chamber, pressure transducer and signal cable, the end of described communicating pipe communicates with the filtrator probe, the other end of communicating pipe connects the top of seal chamber and communicates with the inside of seal chamber, described seal chamber and be full of power transmission liquid in communicating pipe, described power transmission liquid be density greater than water and water insoluble and in the low temperature range that requires not congelative liquid, described pressure transducer is fixed in the bottom of seal chamber, and the pressure sensitive film of described pressure transducer communicates with seal chamber inside, and the output terminal of pressure transducer links to each other with signal cable.
2. frozen soil pore water pressure measurement device according to claim 1 is characterized in that, described filtrator probe is the stainless steel sintering probe of porous ceramics probe or porous, and described filtration is popped one's head in and intercepted fine particle in the frozen soil hole by porous.
3. frozen soil pore water pressure measurement device according to claim 1 is characterized in that, the long-pending shaft section less than seal chamber of the shaft section of described communicating pipe is long-pending.
4. frozen soil pore water pressure measurement device according to claim 1 is characterized in that, the low temperature range of described requirement is-50 ℃ ~ 0 ℃, and described power transmission liquid is not congelative liquid when being low to moderate-50 ℃ in temperature.
5. frozen soil pore water pressure measurement device according to claim 4 is characterized in that, described power transmission liquid is methenyl choloride or decane.
6. frozen soil pore water pressure measurement device according to claim 1, it is characterized in that, described pressure transducer is steel chord type pressure transducer or piezoresistive pressure sensor or fiber Bragg grating type pressure transducer or resistance-strain chip pressure transducer or differential resistance type pressure transducer or capacitance pressure transducer, or differential capacitance type pressure transducer.
7. frozen soil pore water pressure measurement device according to claim 1 is characterized in that, described signal cable is low temperature resistant cable or low temperature resistant fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220518132 CN202836859U (en) | 2012-10-10 | 2012-10-10 | Measurement device for frozen earth pore water pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220518132 CN202836859U (en) | 2012-10-10 | 2012-10-10 | Measurement device for frozen earth pore water pressure |
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| Publication Number | Publication Date |
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| CN202836859U true CN202836859U (en) | 2013-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220518132 Expired - Lifetime CN202836859U (en) | 2012-10-10 | 2012-10-10 | Measurement device for frozen earth pore water pressure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879148A (en) * | 2012-10-10 | 2013-01-16 | 基康仪器(北京)有限公司 | Device and method for measuring frozen soil pore water pressure |
| CN107421679A (en) * | 2017-08-15 | 2017-12-01 | 中国科学院寒区旱区环境与工程研究所 | A kind of test probe for being used to monitor frozen soil Pore Pressure |
| CN110306393A (en) * | 2019-07-11 | 2019-10-08 | 哈尔滨工业大学 | A kind of involution form high temperature permafrost area reinforcement heat melts a road structure |
-
2012
- 2012-10-10 CN CN 201220518132 patent/CN202836859U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879148A (en) * | 2012-10-10 | 2013-01-16 | 基康仪器(北京)有限公司 | Device and method for measuring frozen soil pore water pressure |
| CN107421679A (en) * | 2017-08-15 | 2017-12-01 | 中国科学院寒区旱区环境与工程研究所 | A kind of test probe for being used to monitor frozen soil Pore Pressure |
| CN110306393A (en) * | 2019-07-11 | 2019-10-08 | 哈尔滨工业大学 | A kind of involution form high temperature permafrost area reinforcement heat melts a road structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: JIKANG INSTRUMENT CO., LTD. Free format text: FORMER NAME: JIKANG INSTRUMENT(BEIJING) CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 102488 Beijing city Fangshan District Liangxiang Kaixuan Street Binhe Street No. 3 Patentee after: CHINA GEOKON INSTRUMENTS Co.,Ltd. Address before: 102488 Beijing city Fangshan District Liangxiang Kaixuan Street Binhe Street No. 3 Patentee before: Geokon Instruments (Beijing) Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130327 |