CN102749434A - Indenter for indoor freeze thawing test - Google Patents

Indenter for indoor freeze thawing test Download PDF

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Publication number
CN102749434A
CN102749434A CN2012101406850A CN201210140685A CN102749434A CN 102749434 A CN102749434 A CN 102749434A CN 2012101406850 A CN2012101406850 A CN 2012101406850A CN 201210140685 A CN201210140685 A CN 201210140685A CN 102749434 A CN102749434 A CN 102749434A
Authority
CN
China
Prior art keywords
indenter
cover
cover plate
temperature
soil
Prior art date
Application number
CN2012101406850A
Other languages
Chinese (zh)
Inventor
顾同欣
马巍
王贵荣
关辉
Original Assignee
中国科学院寒区旱区环境与工程研究所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 中国科学院寒区旱区环境与工程研究所 filed Critical 中国科学院寒区旱区环境与工程研究所
Priority to CN2012101406850A priority Critical patent/CN102749434A/en
Publication of CN102749434A publication Critical patent/CN102749434A/en

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Abstract

The present invention relates to an indenter for an indoor freeze thawing test. The indenter is divided into two parts of an upper indenter and a lower indenter, wherein the upper indenter and the lower indenter respectively comprise an upper cover plate and a lower cover plate, the cover plate is engraved with a circular groove, and the circular groove is communicated with the outside through temperature control holes, such that a cooling liquid generated by an external refrigeration device can be circulated inside the indenter so as to achieve indenter temperature control. Sealing rings are arranged between the upper cover plates and the lower cover plates, and the upper cover plate and the lower cover plate are connected into integration through fixation bolts so as to ensure integrity and tightness of the indenter. Water replenishment holes are adopted to connect a space between an outside water source and a supporting rib, wherein a multi-hole plate is placed on the supporting rib, such that water imported from the outside can contact soil through holes on the multi-hole plate, and an indenter temperature can be transmitted to the soil in time by using good thermal conductivity of a metal. With the present invention, accurate control of a temperature condition and a water replenishment condition during a soil freeze thawing process can be achieved so as to simulate an outdoor environment, and provide technical supports for an indoor freeze thawing test.

Description

A kind of pressure head that is applicable to the indoor freezing and thawing test
Technical field
The present invention relates to a kind of pressure head that is applicable to the indoor freezing and thawing test.Utilize this pressure head, can realize control temperature conditions in the soil body freezing process and moisturizing condition, thus the simulating chamber external environment, for the indoor freezing and thawing test provides technical support.
Background technology
Frost heave is meant the soil body volumetric expansion that causes when soil water divides glaciation, and soil body thaw collapse is meant the soil body sedimentation that causes after freezing the soil body melts, and the both is inside soil body temperature field, moisture field and stress field results of interaction.Frost heave and thaw collapse problem are the main engineering diseases of ever frost district roadbed all the time.With the Qinghai-Tibet Highway is example, and 85% subgrade defect is that thaw collapse causes, and 15% is that frost heave causes with frost boiling.Therefore the research of carrying out soil frost heave and thaw collapse aspect all has very important significance with maintenance for the design of engineering.
To promptly carry out the indoor freezing and thawing process testing in the indoor research of carrying out aspect body frost heaving and the thaw collapse, at first need the test unit that is applicable to soil body frozen-thaw process.To soil body freezing-thawing test the complete relatively pilot system of one cover has been arranged at present, this system comprises the temperature-controlling system of the soil body, water charging system, temperature acquisition system, control pressurer system etc.This system can simulate the actual environment condition of the extraneous soil body basically, but in practical operation, also exists some problems, like operation relative complex, problems such as temperature control pressure head leakage.The leakage problem can cause that thereby round-robin alcohol penetrates into the experiment inside soil body and causes the character of the soil body to change; Cause problems such as experimental result distortion; This has proposed condition for carrying out freezing-thawing test accurately and reliably; Therefore, design is a kind of that can overcome the above problems, simple to operation and be applicable to that the pressure head of indoor freezing and thawing test is very necessary.
Summary of the invention
In view of above-mentioned, the object of the present invention is to provide a kind of pressure head that is applicable to the indoor freezing and thawing test, utilizes this upper and lower pressure head, can simulated soil body in outdoor temperature and moisturizing condition, for studying problems such as soil frost heave, thaw collapse technical support is provided.
The objective of the invention is to realize like this:
A kind of pressure head that is applicable to indoor freezing and thawing test, be by the seaming chuck of control temperature conditions be the may command temperature conditions again the push-down head of may command moisturizing condition constitute:
A. seaming chuck is made up of first upper cover plate and first lower cover, and first upper cover plate is drilled with temperature-control hole, and first lower cover is carved with circulation groove, and temperature-control hole is communicated with the reference position of circulation groove; Between first upper cover plate and first lower cover O-ring seal is housed, two cover plates are fastening through set bolt, inserted num and embedded nut, are fixed as a complete pressure head.
Push-down head is made up of second upper cover plate and second lower cover, and second upper cover plate is carved with and supports stupefied and circulation groove, supports to be placed with porous plate on stupefied; Second lower cover is drilled with temperature-control hole and moisturizing hole, between second upper cover plate and second lower cover O-ring seal is housed, and two cover plates are fastening through set bolt, inserted num and embedded nut, are fixed as a complete pressure head.
The beneficial effect of advantage of the present invention and generation is:
1, first lower cover is carved with circulation groove, between first upper cover plate and first lower cover O-ring seal is set, and can guarantee the sealing between the upper and lower cover plate, avoided the phenomenon of leakage in the cold liquid cyclic process.
2, through on circulation groove, adding an expanded metal, make the moisture that replenishes to contact with the soil body on the one hand through aperture on it, also can utilize the good thermal conductivity of metal to make the temperature of pressure head to be delivered on the soil body timely on the other hand.
When 3, carrying out the indoor freezing and thawing test; Seaming chuck need be positioned over the sample tank interior; Through on seaming chuck, being provided with inserted num, join with nut and can easily seaming chuck be put into the test tank interior, also can easily it be taken out in the test tank body after the off-test.
4, upper cover plate and lower cover are connected as a single entity through set bolt, have guaranteed the globality of pressure head.
Description of drawings:
Fig. 1 is the synoptic diagram of first upper cover plate of the present invention.
Fig. 2 is Fig. 1 cross-section cutaway view.
Fig. 3 is the synoptic diagram of first lower cover of the present invention.
Fig. 4 is Fig. 3 cross-section cutaway view.
Fig. 5 is the synoptic diagram of second upper cover plate of the present invention.
Fig. 6 is Fig. 5 cross-section cutaway view.
Fig. 7 is the synoptic diagram of second lower cover of the present invention.
Fig. 8 is Fig. 7 cross-section cutaway view.
Among the figure:
1-set bolt 2-temperature-control hole 3-inserted num 4-circulation groove 5-embedded nut 6-O-ring seal 7-moisturizing hole 8-porous plate 9-supports stupefied.
Embodiment
Below, in conjunction with accompanying drawing, through implementing that the present invention is done further detailed description again:
A kind of pressure head that is applicable to indoor freezing and thawing test, be by the seaming chuck of control temperature conditions be the may command temperature conditions again the push-down head of may command moisturizing condition constitute.
Seaming chuck is made up of first upper cover plate and first lower cover, is drilled with 2, the first lower covers of 2 temperature-control holes on first upper cover plate and is carved with circulation groove 4.It is fastening through set bolt 1, inserted num 3 and embedded nut 5 between first upper cover plate and first lower cover O-ring seal 6, two cover plates to be housed, and is fixed as a complete pressure head (referring to Fig. 1-2).
2 temperature-control holes 2 are in communication with the outside the reference position of circulation groove 4 closed circuits; Cold liquid by the external refrigeration device produces can be inner into and out of pressure head through temperature-control hole 2; Thereby reach the pressure head temperature controlling, and then can control the temperature conditions of soil body freezing process.Be provided with O-ring seal 6 between the upper and lower cover plate, can avoid in the cold liquid cyclic process phenomenon of leakage taking place.
For being the may command temperature conditions push-down head of may command moisturizing condition again, push-down head is made up of second upper cover plate and second lower cover, and second upper cover plate is carved with support stupefied 9 and circulation groove 4, supports and is placed with porous plate 8 on stupefied 9; Be drilled with on second lower cover that between temperature-control hole 2 and 7, the second upper cover plates in moisturizing hole and second lower cover O-ring seal 6, two cover plates to be housed fastening through set bolt 1, inserted num 3 and embedded nut 5, be fixed as a complete pressure head (referring to Fig. 3-4).
Drill through the moisturizing hole 7 of running through push-down head at second lower cover, moisturizing hole 7 can be connected with the horse Liao Te bottle in the external world, can control head height through the height of regulating horse Liao Te bottle; Make moisture fully contact with the soil body; Porous plate 8 is maked somebody a mere figurehead by supporting stupefied 9, and making can have the moisture enrichment between porous plate 8 and the pressure head, drills through aperture on the porous plate 8 uniformly; Thereby make moisture to be connected with the soil body through porous plate 8; During test, the soil body sucks inside soil body in the meeting that influences of factors such as thermograde with the moisture that its lower end is in contact with it, and external horse Liao Te bottle can guarantee that its lower end moisture contacts with the soil body constantly; Can realize continuous moisturizing, thereby realize control soil body moisturizing condition to the soil body.Upper cover plate is carved with circulation groove 4, is connected with extraneous refrigerating plant through temperature-control hole 2, can make the cold liquid that is produced by extraneous refrigerating plant in circulation groove 4, circulate, thereby realize whole pressure head temperature controlling.Porous plate 8 is elected thermal conductivity good metal material as, makes the temperature of push-down head directly to be delivered on the soil body rapidly.Embedded nut 3 is furnished with a corresponding with it expansion bolt, can bolt be screwed in nut during test, thereby can easily whole pressure head be put into the test tank interior.

Claims (1)

1. pressure head that is applicable to indoor freezing and thawing test, be by the seaming chuck of control temperature conditions be the may command temperature conditions again the push-down head of may command moisturizing condition constitute, it is characterized in that:
A. seaming chuck is made up of first upper cover plate and first lower cover, and first upper cover plate is drilled with temperature-control hole (2), and first lower cover is carved with circulation groove (4), and temperature-control hole (2) is communicated with the reference position of circulation groove (4); Between first upper cover plate and first lower cover O-ring seal (6) is housed, two cover plates are fastening through set bolt (1), inserted num (3) and nut (5), are fixed as a complete pressure head;
B. push-down head is made up of second upper cover plate and second lower cover, and second upper cover plate is carved with and supports stupefied (9) and circulation groove (4), supports and is placed with porous plate (8) on stupefied (9); Second lower cover is drilled with temperature-control hole (2) and moisturizing hole (7); Between second upper cover plate and second lower cover O-ring seal (6) is housed; Two cover plates are fastening through set bolt (1), inserted num (3) and embedded nut (5), are fixed as a complete pressure head.
CN2012101406850A 2012-05-09 2012-05-09 Indenter for indoor freeze thawing test CN102749434A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN2012101406850A CN102749434A (en) 2012-05-09 2012-05-09 Indenter for indoor freeze thawing test

Publications (1)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104215566A (en) * 2013-06-04 2014-12-17 中国科学院寒区旱区环境与工程研究所 Visual soil freeze-thawing process test apparatus
CN104297451A (en) * 2014-10-23 2015-01-21 石家庄铁道大学 Large-grain-size soil body frost heaving performance testing device
CN104316671A (en) * 2014-10-10 2015-01-28 同济大学 Test device for measuring frost heaving force and frost heaving capacity of artificial frozen-thawed soil
CN106018756A (en) * 2016-08-09 2016-10-12 中国科学院寒区旱区环境与工程研究所 Thermal insulation test box with functions of water supplement at bottom and temperature control
CN106645637A (en) * 2016-11-21 2017-05-10 重庆大学 Freeze thawing thermal cycle tri-axial seepage multifunctional pressure chamber for geotechnical material

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007010568A (en) * 2005-07-01 2007-01-18 Hitachi Constr Mach Co Ltd Method for measuring soil dry density and method and apparatus for determining degree of soil compaction
CN102004053A (en) * 2010-09-20 2011-04-06 中国科学院寒区旱区环境与工程研究所 Temperature-controllable portable multifunctional pressure chamber
CN102338797A (en) * 2011-07-29 2012-02-01 中国科学院寒区旱区环境与工程研究所 High-pressure soil freezing temperature test device
CN102435503A (en) * 2011-11-24 2012-05-02 长江水利委员会长江科学院 Large-scale true triaxial experiment testing method and equipment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007010568A (en) * 2005-07-01 2007-01-18 Hitachi Constr Mach Co Ltd Method for measuring soil dry density and method and apparatus for determining degree of soil compaction
CN102004053A (en) * 2010-09-20 2011-04-06 中国科学院寒区旱区环境与工程研究所 Temperature-controllable portable multifunctional pressure chamber
CN102338797A (en) * 2011-07-29 2012-02-01 中国科学院寒区旱区环境与工程研究所 High-pressure soil freezing temperature test device
CN102435503A (en) * 2011-11-24 2012-05-02 长江水利委员会长江科学院 Large-scale true triaxial experiment testing method and equipment

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104215566A (en) * 2013-06-04 2014-12-17 中国科学院寒区旱区环境与工程研究所 Visual soil freeze-thawing process test apparatus
CN104215566B (en) * 2013-06-04 2017-04-05 中国科学院寒区旱区环境与工程研究所 Visualization soil body frozen-thaw process assay device
CN104316671A (en) * 2014-10-10 2015-01-28 同济大学 Test device for measuring frost heaving force and frost heaving capacity of artificial frozen-thawed soil
CN104316671B (en) * 2014-10-10 2016-05-18 同济大学 A kind of experimental rig that measures artificial freeze thawing soil frost-heave force and frost heaving amount
CN104297451A (en) * 2014-10-23 2015-01-21 石家庄铁道大学 Large-grain-size soil body frost heaving performance testing device
CN104297451B (en) * 2014-10-23 2017-02-15 石家庄铁道大学 Large-grain-size soil body frost heaving performance testing device
CN106018756A (en) * 2016-08-09 2016-10-12 中国科学院寒区旱区环境与工程研究所 Thermal insulation test box with functions of water supplement at bottom and temperature control
CN106645637A (en) * 2016-11-21 2017-05-10 重庆大学 Freeze thawing thermal cycle tri-axial seepage multifunctional pressure chamber for geotechnical material
CN106645637B (en) * 2016-11-21 2019-01-22 重庆大学 Three axis seepage flow multifunctional compression chamber of rock-soil material freeze thawing thermal cycle

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Application publication date: 20121024