CN106370596A - Device for measuring unfrozen water content of frozen soil on different stress paths - Google Patents
Device for measuring unfrozen water content of frozen soil on different stress paths Download PDFInfo
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- CN106370596A CN106370596A CN201610688306.XA CN201610688306A CN106370596A CN 106370596 A CN106370596 A CN 106370596A CN 201610688306 A CN201610688306 A CN 201610688306A CN 106370596 A CN106370596 A CN 106370596A
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- nonmagnetic metal
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- lock catch
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/10—Measuring moisture content, e.g. by measuring change in length of hygroscopic filament; Hygrometers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
- G01N24/081—Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- High Energy & Nuclear Physics (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Engineering & Computer Science (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a device for measuring unfrozen water content of frozen soil on different stress paths. The device comprises a temperature-controllable constant temperature tank, a nitrogen cylinder, a pressure-resistant nonmagnetic metal can, a lock catch-type nonmagnetic metal cover, a gas-tight membrane, a waterless thermal insulation sleeve, a nonmagnetic metal sample pedestal, an adjustable nonmagnetic metal rack, a nuclear magnetic resonance instrument and a substrate. The substrate is provided with the temperature-controllable constant temperature tank, the adjustable nonmagnetic metal rack and the nuclear magnetic resonance instrument. The adjustable nonmagnetic metal rack is connected to the pressure-resistant nonmagnetic metal can. The lock catch-type nonmagnetic metal cover tightly fits to the pressure-resistant nonmagnetic metal can. The nonmagnetic metal sample pedestal is arranged in the pressure-resistant nonmagnetic metal can. The device realizes direct, fast and accurate measurement of unfrozen water content of a frozen soil sample under uniaxial, triaxial and isotropic conditions, realizes measurement of unfrozen water content of frozen soil on different stress paths and provides basis data for frozen soil physical and mechanical phenomenon explanation and correlation theory development.
Description
Technical field
The present invention relates to frozen soil measurement apparatus, unfrozen water content in measuring frozen under specifically a kind of difference stress path
Device, can achieve the direct test of unfrozen water content in frozen soil sample under difference stress paths.
Background technology
Frozen soil be a kind of temperature be less than 0 DEG C and the rock mass containing ice or soil, its after freezing not all of aqueous water complete
Portion is transformed into ice, but remains a number of aqueous water (referred to as not freezing water), and its content is not only with intrinsic factor soil
The change of matter, water content, dry density etc. and change, and also change with the change of the extrinsic factor such as temperature, pressure.Do not freeze
Water content has a major impact to the calorifics of frozen soil body and physico-mechanical properties, and it is by must referring to of frozen soil thermal technology simulation calculating
Mark, is also the leading factor that frozen soil mechanics property changes, and proposes unfrozen water content in multiple test frozen soil for this scholar
Method, such as calorimetry, nuclear magnetic resonance method, domain reflectometer method, supercritical ultrasonics technology, solidification point method etc., wherein nuclear magnetic resonance method
Measurement result is more accurate.A common issue present in these methods is can not to carry out inside soil body under load action not freezing
The test of water content, then Xu Xue ancestral etc. propose a set of with nuclear magnetic resonance analyser matching used mechanical pressurization system, this system
Achieve the test of unfrozen water content in vertical uniform load q sample when the soil body to a certain extent, because machine power needs liquid
Potential source provides, thus being constant temperature and quick scanning brings difficulty, and within the system limited by the lateral deformation of sample, and not
Each test to unfrozen water content in sample under equipressure or three axle load condition can be carried out.
Content of the invention
In view of above-mentioned, the purpose of the present invention aims to provide unfrozen water content in measuring frozen under a kind of difference stress path
Device, can realize the quick measurement of unfrozen water content in frozen soil sample under different stress paths by this device, and should
Power path is basically identical with the stress path in conventional frozen soil mechanics test.
The object of the present invention is achieved like this:
The device of unfrozen water content in measuring frozen under a kind of difference stress path, including controllable temperature temperature chamber, nitrogen cylinder, pressure
Regulating valve, pressure-regulating valve, nonmetallic pressure hose, pressure no magnetic canister, lock catch type no magnetic crown cap, anti-air film, no
Magnetic test button base, adjustable no magnetic metal rack, nuclear magnetic resonance analyser, substrate, substrate is provided with controllable temperature temperature chamber, adjustable no magnetic
Metal rack and nuclear magnetic resonance analyser；Adjustable no magnetic metal rack is connected with pressure no magnetic canister.
Lock catch type no magnetic crown cap and pressure no magnetic canister tight fit, are provided with no magnetic metal in pressure no magnetic canister
Specimen mount.
Lock catch type no magnetic crown cap is provided with pore and pore, and pore is placed in the center of lock catch type no magnetic crown cap；
The lower section of pore is provided with piston；The no magnetic crown cap socket of piston and lock catch type；Sky between piston and lock catch type no magnetic crown cap
Chamber connects with pore；The inner chamber of pressure no magnetic canister is connected with pore.
Pressure-regulating valve and pressure-regulating valve are fixed on nitrogen cylinder；Pressure-regulating valve passes through nonmetallic pressure hose
Connect with pore；Pressure-regulating valve is connected with pore by nonmetallic pressure hose.
Above-mentioned no magnetic test button base is placed in pressure no magnetic metal pot bottom, be sealed on the sample in anti-air film,
It is positioned over after lower setting pressure head no on magnetic test button base；Piston and no magnetic test button base are one on the other, solid by sample
Fixed.
After above-mentioned pressure no magnetic canister and lock catch type no magnetic crown cap tight fit salable in anhydrous muff.
Advantages of the present invention and beneficial effect:
1st, the present invention can directly, quickly, accurately measure in single shaft, three axles and each frozen soil sample under the conditions of equipressure not
Freeze water content.
2 present invention can ensure that in loading procedure sample deformation basically identical with the sample deformation in conventional mechanical test.
3rd, the anhydrous muff one side in the present invention can prevent the change of specimen temperature in scanning process, on the other hand
The formation of pressure no magnetic canister surface moisture film in scanning process can be prevented, reduce detection error.
4th, the present invention is simple, easy to operate, and loading procedure substantially conforms to the loading procedure in conventional frozen soil mechanics test, thus
For frozen soil physics, Mechanics Phenomenon explains and the development of correlation theory provides basic data.
Brief description
Fig. 1 is the structural representation of the present invention.
Fig. 2 is lock catch type pressure no magnetic canister sectional view in the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the structural principle and operation principle of the present invention is described further:
As shown in Figure 1, 2, under a kind of difference stress path in measuring frozen unfrozen water content device, including controllable temperature temperature chamber
1st, nitrogen cylinder 2, pressure-regulating valve 3, pressure-regulating valve 4, nonmetallic pressure hose 5, pressure no magnetic canister 6, lock catch type be no
Magnetic crown cap 7, anti-air film 8, no magnetic test button base 9, adjustable no magnetic metal rack 10, nuclear magnetic resonance analyser 16, substrate 13.
Substrate 13 is provided with controllable temperature temperature chamber 1, adjustable no magnetic metal rack 10, nuclear magnetic resonance analyser 16；Adjustable no magnetic metal
Frame 10 is connected with pressure no magnetic canister 6.
Lock catch type no magnetic crown cap 7 and pressure no magnetic canister 6 tight fit, are provided with no magnetic in pressure no magnetic canister 6
Test button base 9.
Lock catch type no magnetic crown cap 7 is provided with pore 17 and pore 18, and pore 17 occupy lock catch type no magnetic crown cap 7
Center；The lower section of pore 17 is provided with piston 14；Piston 14 and lock catch type no magnetic crown cap 7 is socketed；Piston 14 and lock catch type no magnetic
Cavity between crown cap 7 connects with pore 17；The inner chamber of pressure no magnetic canister 6 is connected with pore 18.
Pressure-regulating valve 3 and pressure-regulating valve 4 are fixed on nitrogen cylinder 2；Pressure-regulating valve 3 passes through nonmetallic pressure
Flexible pipe 5 is connected with pore 18；Pressure-regulating valve 4 is connected with pore 17 by nonmetallic pressure hose 5.
No magnetic test button base 9 is placed in pressure no magnetic canister 6 bottom.
It is positioned over after the sample 12 that is sealed in anti-air film 8 upper and lower setting pressure head 15 no on magnetic test button base 9.
Sample 12 passes through piston 14 and no magnetic test button base 9 is fixed.
After pressure no magnetic canister 6 and lock catch type no magnetic crown cap 7 tight fit salable in anhydrous muff 11.
Embodiment
During test, first by sample 12(diameter 30.0mm, and meet ratio of height to diameter be more than 2:1) two ends place pressure head 15,
And be positioned on the no magnetic test button base 9 in pressure no magnetic canister 6 with after the sealing of anti-air film 8, the material of anti-air film 8 is
Rubber, then by the no magnetic crown cap 7 of the lock catch type with piston 14 and pressure no magnetic canister 6 tight fit, sample 12 passes through piston
14 and no magnetic test button base 9 be fixed.
Pressure no magnetic canister 6 is connected with adjustable no magnetic metal rack 10；Pore 17 on lock catch type no magnetic crown cap 7
Connected with pressure-regulating valve 4 by nonmetallic pressure hose 5, pressure-regulating valve 4 is connected with nitrogen cylinder 2；No magnetic crown cap
Pore 18 on 7 is connected with pressure-regulating valve 3 by nonmetallic pressure hose 5, and pressure-regulating valve 3 is connected with nitrogen cylinder 2.
The on-load pressure respectively of stress path type according to demand:
1). when carrying out unfrozen water content test in the lower sample of uniaxial compression effect, closing presure regulating valve 3, adjust pressure
Force regulating valve 4, until axial compressive force (pressure in cavity between piston (14) and lock catch type no magnetic crown cap 7) reaches target
Value.
2). when carrying out unfrozen water content test in each lower sample to isobaric effect, adjust pressure-regulating valve 3 He simultaneously
Adjust pressure-regulating valve 4, until (pressure no magnetic canister 6 inner chamber) pressure reaches same target around axial compressive force and sample
Value.
3). when carrying out unfrozen water content test in sample under triaxial compressions load action, adjust pressure first simultaneously and adjust
Section valve 3 and pressure-regulating valve 4, until (pressure no magnetic canister 6 inner chamber) pressure reaches same mesh around axial compressive force and sample
Scale value, around holding sample, (pressure no magnetic canister 6 inner chamber) pressure is constant, and then proceeding to regulation pressure-regulating valve 4 makes axle
Reach another desired value to pressure.
After the pressure-loaded needing completes, being sent into pressure no magnetic canister 6 by adjustable no magnetic metal rack 10 can
Carry out constant temperature, after sample 12 temperature reaches target temperature and continues constant temperature 2h, then by pressure no magnetic metal in temperature control temperature chamber 1
Tank 6 removes controllable temperature temperature chamber 1, and the synthermal anhydrous muff 11 such as will have with sample 12 and be enclosed within pressure no magnetic canister
On 6, then the more pressure no magnetic canister 6 with anhydrous muff 11 is rapidly sent into by core by adjustable no magnetic metal rack 10
Magnetic resonance device 16 sample intracavity is scanned, and adjusts the temperature of controllable temperature temperature chamber 1 to next target temperature, scanning completes simultaneously
Anhydrous muff 11 on removal pressure no magnetic canister 6 afterwards, and by adjustable no magnetic metal rack 10 by pressure no magnetic canister 6
Send into the constant temperature carrying out next stage in controllable temperature temperature chamber 1.
So repeatedly, until off-test, thus can record different stress paths and at a temperature of do not freeze water in sample 12 and contain
Amount data.
Claims (2)
1. under a kind of difference stress path in measuring frozen unfrozen water content device, including controllable temperature temperature chamber (1), nitrogen cylinder
(2), pressure-regulating valve (3), pressure-regulating valve (4), nonmetallic pressure hose (5), pressure no magnetic canister (6), lock catch type
No magnetic crown cap (7), anti-air film (8), no magnetic test button base (9), adjustable no magnetic metal rack (10), anhydrous muff
(11), nuclear magnetic resonance analyser (16), substrate (13) it is characterised in that: described substrate (13) be provided with controllable temperature temperature chamber (1), can
Adjust no magnetic metal rack (10), nuclear magnetic resonance analyser (16)；Adjustable no magnetic metal rack (10) is connected with pressure no magnetic canister (6)；
Described lock catch type no magnetic crown cap (7) and pressure no magnetic canister (6) tight fit, set in pressure no magnetic canister (6)
Have or not magnetic test button base (9)；
Described lock catch type no magnetic crown cap (7) is provided with pore (17) and pore (18)；Described pore (17) is placed in lock
Formula no magnetic crown cap (7) center；The lower section of pore (17) is provided with piston (14)；Piston (14) and lock catch type no magnetic crown cap (7)
Socket；Cavity between piston (14) and lock catch type no magnetic crown cap (7) and pore (17) connect；Pressure no magnetic canister (6)
Inner chamber connect with pore (18)；
Described pressure-regulating valve (3) and pressure-regulating valve (4) are fixed on nitrogen cylinder (2)；Pressure-regulating valve (3) passes through non-
Metal pressure hose (5) is connected with pore (18)；Pressure-regulating valve (4) passes through nonmetallic pressure hose (5) and pore
(17) connect.
2. as claimed in claim 1 under a kind of difference stress path in measuring frozen unfrozen water content device, its feature exists
After: described pressure no magnetic canister (6) with lock catch type no magnetic crown cap (7) tight fit salable in anhydrous muff
(11) in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610688306.XA CN106370596A (en) | 2016-08-19 | 2016-08-19 | Device for measuring unfrozen water content of frozen soil on different stress paths |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610688306.XA CN106370596A (en) | 2016-08-19 | 2016-08-19 | Device for measuring unfrozen water content of frozen soil on different stress paths |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106370596A true CN106370596A (en) | 2017-02-01 |
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ID=57878086
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610688306.XA Pending CN106370596A (en) | 2016-08-19 | 2016-08-19 | Device for measuring unfrozen water content of frozen soil on different stress paths |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770418A (en) * | 2017-03-17 | 2017-05-31 | 西安科技大学 | The device and method of Rock And Soil internal moisture migration in real-time monitoring frozen-thaw process |
| CN108107068A (en) * | 2017-12-11 | 2018-06-01 | 内蒙古工业大学 | The test method of lightweight aggregate concrete hole icing rate under Frozen-thawed cycled |
| CN109959563A (en) * | 2017-12-14 | 2019-07-02 | 国网内蒙古东部电力有限公司经济技术研究院 | A kind of p test methods such as high-precision frozen soil |
| CN113238031A (en) * | 2021-05-25 | 2021-08-10 | 中国科学院西北生态环境资源研究院 | Real-time detection system for liquid water content in frozen soil |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770418A (en) * | 2017-03-17 | 2017-05-31 | 西安科技大学 | The device and method of Rock And Soil internal moisture migration in real-time monitoring frozen-thaw process |
| CN108107068A (en) * | 2017-12-11 | 2018-06-01 | 内蒙古工业大学 | The test method of lightweight aggregate concrete hole icing rate under Frozen-thawed cycled |
| CN109959563A (en) * | 2017-12-14 | 2019-07-02 | 国网内蒙古东部电力有限公司经济技术研究院 | A kind of p test methods such as high-precision frozen soil |
| CN113238031A (en) * | 2021-05-25 | 2021-08-10 | 中国科学院西北生态环境资源研究院 | Real-time detection system for liquid water content in frozen soil |
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