CN103512699A - Device for measuring pore water pressure in frozen soil - Google Patents
Device for measuring pore water pressure in frozen soil Download PDFInfo
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- CN103512699A CN103512699A CN201210207347.4A CN201210207347A CN103512699A CN 103512699 A CN103512699 A CN 103512699A CN 201210207347 A CN201210207347 A CN 201210207347A CN 103512699 A CN103512699 A CN 103512699A
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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
The present invention relates to frozen soil experiment instrument field, is a kind of device of measuring pore water pressure in frozen soil specifically.
Background technology
In frozen soil physical mechanics research field, pore water pressure force measurement has become deformation mechanisms such as exploring Frost heave of frozen soil, thaw collapse and has carried out the key point of correlation computations.In frozen soil, not all water all exists with the form of ice, when frozen soils temperature is during close to transformation temperature, do not freeze the 20%-30% that water volume content can reach total moisture content, but because environment temperature is lower, not freezing when water is discharged to soil body surface under load action in frozen soil can be freezed, so traditional consolidation test can not be applicable to frozen soil in the method for experiment tank skin measured hole gap water pressure.In addition, in traditional Soil mechanics experiment, certain experimental apparatus adaptable soil sample height fix.In addition in frozen soil experiment, in order to observe the Water Transport phenomenon of frozen soil under thermograde, the height of soil sample need to be increased, in traditional Soil mechanics experiment, certain experimental apparatus adaptable soil sample height fix, cannot meet the observation of the Water Transport phenomenon of frozen soil under thermograde, thereby need to design a kind of experimental provision that can adapt to different soil sample height, necessitate.
Summary of the invention
In sum, the object of the present invention is to provide a kind of device of measuring pore water pressure in frozen soil, a difficult problem of measuring to solve frozen soil Pore Pressure.
The object of the invention is to realize by following technology:
In frozen soil, measure a device for pore water pressure, comprise temperature control box 1, experimental tank and osmometer, between base and fixed head, be provided with experimental tank, and connect by fixture; Experimental tank top is provided with polishing head; Polishing head upper end is provided with pressure rod, and lower end is provided with permeable stone; It between base and permeable stone, is frozen soil sample; Between experimental tank and between experimental tank and base, there is O-ring seal.
The inside of above-mentioned base and polishing head is provided with cold liquid circulation passage.
Above-mentioned experimental tank 1-5, adopt organic glass to make, the tank skin of experimental tank is provided with slotting and boring, and slotting drill hole are laid osmometer, and drill hole is laid temp probe.
Above-mentioned osmometer is to consist of miniature probe, pressure tube, pressure transducer and data acquisition line concentration; The front end of pressure tube connects miniature probe, rear end Bonding pressure sensor; Between pressure tube and pressure transducer, be provided with saturated fluid infusion mouth; The end of pressure transducer connects data acquisition line concentration; Data acquisition line concentration is connected with the data collecting instrument of temperature-controlled box outside.
The diameter of above-mentioned miniature probe is 4 ± 0.3mm, adopts permeable stone, or pottery clay plates, or porous ceramics is made.
In above-mentioned pressure tube, be full of the uncongealable pressure transmitting medium of low temperature.
Above-mentioned pressure transmitting medium is to decane, or sherwood oil, or dimethyl silicon oil, or methenyl choloride, or ethanol.
Advantage of the present invention and beneficial effect:
1, the present invention adopts layering experimental tank, can carry out real-time measurement to the pore water pressure of different soil samples, differing heights position.
2, the present invention adopts a small probe, be placed in the soil body, the pressure transmitting medium not freezing by low temperature is derived the soil body by the pressure in frozen soil, thereby replace tradition and in soil body surface, measure the mode of pore water pressure, like this, just do not need the outside draining of the soil body just can measure the situation of change of pore water pressure, because probe is buried underground in slotting, so the destruction that can not cause miniature probe because specimen deformation is too large, solved in traditional experiment because water freezes after oozing out soil body surface simultaneously, caused cannot measuring the problem of pore water pressure in frozen soil.
3, the layering experimental tank that the present invention adopts is intended to solve the experimental tank device problem that adapts to various sample height, and can in experiment, monitor the situation of change of soil body differing heights place's temperature and pore water pressure.
4, the present invention, in conjunction with the advantage of conventional compression experiment, can measure the situations such as soil sample compress variation, Temperature Distribution, pore water pressure variation, has easy to operately, controls simple advantage.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the enlarged diagram of osmometer in Fig. 1.
Fig. 3 pore water pressure change curve that to be clay sample measure under-1.0 ℃, 90kPa load action.
Fig. 4 pore water pressure change curve that to be loess sample measure under-1.0 ℃, 102kPa load action.
In figure: the saturated fluid infusion mouth of 1-temperature-controlled box 2-base 3-O-ring seal 4-osmometer 5-organic glass experimental tank 6-permeable stone 7-fixed head 8-polishing head 9-pressure rod 10-fixture 11-temp probe 12-slotting 13-miniature probe 14-pressure tube 15-16-pressure transducer 17-data acquisition line concentration
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described:
As shown in Figure 1, 2, a kind of device of measuring pore water pressure in frozen soil, comprises temperature control box 1, experimental tank 5 and osmometer 4, is provided with experimental tank 5, and connects by fixture 10 between base 2 and fixed head 7; Experimental tank 5 tops are provided with polishing head 8; Polishing head 8 upper ends are provided with pressure rod 9, and lower end is provided with permeable stone 6; Between base 2 and permeable stone 6, it is frozen soil sample; Between experimental tank 5 and between experimental tank 5 and base 2, there is O-ring seal 3.
Fig. 3 and Fig. 4 are proving tests, do not apply thermograde in experimentation, only to test unit temperature control in subzero temperature, and the interstitial hydraulic pressure of experiments of measuring pot bottom only, experimental result shows that the development of experimental provision is very resultful.
Claims (8)
1. in frozen soil, measure a device for pore water pressure, comprise temperature control box (1), experimental tank (5) and osmometer (4), it is characterized in that: between base (2) and fixed head (7), be provided with experimental tank (5), and connect by fixture (10); Experimental tank (5) top is provided with polishing head (8); Polishing head (8) upper end is provided with pressure rod (9), and lower end is provided with permeable stone (6); Between base (2) and permeable stone 6, it is frozen soil sample; Between experimental tank (5) and between experimental tank (5) and base (2), there is O-ring seal (3).
2. a kind of device of measuring pore water pressure in frozen soil as claimed in claim 1, is characterized in that: in described base (2) and described polishing head (8), be provided with cold liquid circulation passage.
3. a kind of device of measuring pore water pressure in frozen soil as claimed in claim 1, is characterized in that: experimental tank (5) has 1-5, adopts organic glass to make.
4. a kind of device of measuring pore water pressure in frozen soil as claimed in claim 1, is characterized in that: the tank skin of experimental tank (5) is provided with slotting (12) and boring; Slotting (12) drill hole are laid osmometer (4); Drill hole is laid temp probe (11).
5. a kind of device of measuring pore water pressure in frozen soil as claimed in claim 1, is characterized in that: described osmometer (4) consists of miniature probe (13), pressure tube (14), pressure transducer (16) and data acquisition line concentration (17); The front end of pressure tube (14) connects miniature probe (13), rear end Bonding pressure sensor (16); Between pressure tube (14) and pressure transducer (16), be provided with saturated fluid infusion mouth (15); The end of pressure transducer (16) connects data acquisition line concentration (17); Data acquisition line concentration (17) data collecting instrument outside with temperature-controlled box (1) is connected.
6. a kind of device of measuring pore water pressure in frozen soil as claimed in claim 5, is characterized in that: the diameter of described miniature probe (13) is 4 ± 0.3mm, adopts permeable stone, or pottery clay plates, or porous ceramics is made.
7. a kind of device of measuring pore water pressure in frozen soil as claimed in claim 5, is characterized in that: in described pressure tube (13), be full of the uncongealable pressure transmitting medium of low temperature.
8. a kind of device of measuring pore water pressure in frozen soil as claimed in claim 7, is characterized in that: described pressure transmitting medium is to decane, or sherwood oil, or dimethyl silicon oil, or methenyl choloride, or ethanol.
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Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104568286A (en) * | 2014-12-22 | 2015-04-29 | 山东大学 | Osmometer and method convenient for sensor replacement |
CN104819798A (en) * | 2015-05-08 | 2015-08-05 | 西南科技大学 | Sensor for monitoring water pressure change in tailings leaching experiment online |
CN104990947A (en) * | 2015-07-22 | 2015-10-21 | 哈尔滨工业大学 | Bilateral frost-heaving test device for porous materials and testing method |
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 |
CN109580070A (en) * | 2018-11-23 | 2019-04-05 | 北京航天试验技术研究所 | A kind of vectored thrust measuring device not influencing engine axial admission |
CN110068415A (en) * | 2018-07-11 | 2019-07-30 | 内蒙古大学 | Positive frozen soil Pore Pressure and ice pressure measuring device and method |
CN110118628A (en) * | 2019-05-28 | 2019-08-13 | 中国科学院寒区旱区环境与工程研究所 | Frozen soil pore water pressure measurement device |
CN110208065A (en) * | 2019-06-28 | 2019-09-06 | 长沙理工大学 | The rocks sample integration system of batch control compactness is for device and method |
CN110320249A (en) * | 2019-07-12 | 2019-10-11 | 中国农业大学 | A kind of frozen soil flow of water measuring device and method |
CN113739984A (en) * | 2021-08-18 | 2021-12-03 | 中国科学院西北生态环境资源研究院 | Device for measuring frozen soil pore water pressure change |
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104568286A (en) * | 2014-12-22 | 2015-04-29 | 山东大学 | Osmometer and method convenient for sensor replacement |
CN104819798A (en) * | 2015-05-08 | 2015-08-05 | 西南科技大学 | Sensor for monitoring water pressure change in tailings leaching experiment online |
CN104990947A (en) * | 2015-07-22 | 2015-10-21 | 哈尔滨工业大学 | Bilateral frost-heaving test device for porous materials and testing method |
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 |
CN110068415A (en) * | 2018-07-11 | 2019-07-30 | 内蒙古大学 | Positive frozen soil Pore Pressure and ice pressure measuring device and method |
CN110068415B (en) * | 2018-07-11 | 2024-04-02 | 内蒙古大学 | Device and method for measuring pore water pressure and ice pressure in normal frozen soil |
CN109580070A (en) * | 2018-11-23 | 2019-04-05 | 北京航天试验技术研究所 | A kind of vectored thrust measuring device not influencing engine axial admission |
CN110118628A (en) * | 2019-05-28 | 2019-08-13 | 中国科学院寒区旱区环境与工程研究所 | Frozen soil pore water pressure measurement device |
CN110208065A (en) * | 2019-06-28 | 2019-09-06 | 长沙理工大学 | The rocks sample integration system of batch control compactness is for device and method |
CN110208065B (en) * | 2019-06-28 | 2021-07-16 | 长沙理工大学 | Rock-like sample integrated preparation device and method for controlling compaction degree in batches |
CN110320249A (en) * | 2019-07-12 | 2019-10-11 | 中国农业大学 | A kind of frozen soil flow of water measuring device and method |
CN113739984A (en) * | 2021-08-18 | 2021-12-03 | 中国科学院西北生态环境资源研究院 | Device for measuring frozen soil pore water pressure change |
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