CN204514767U - A kind of varying head permeability experimental facility of indoor freezing and thawing equipment - Google Patents
A kind of varying head permeability experimental facility of indoor freezing and thawing equipment Download PDFInfo
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- CN204514767U CN204514767U CN201520167673.6U CN201520167673U CN204514767U CN 204514767 U CN204514767 U CN 204514767U CN 201520167673 U CN201520167673 U CN 201520167673U CN 204514767 U CN204514767 U CN 204514767U
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Abstract
The utility model discloses a kind of varying head permeability experimental facility of indoor freezing and thawing equipment, it comprises permeability apparatus, this permeability apparatus comprises locating support (1), water supply bottle (2) and change water device (3), described locating support (1) comprises and to control separately respectively by low temperature tank and to regulate upper cryostat dish (11) and the lower cryostat dish (12) of temperature, described lower cryostat dish (12) is fixed on base (13), is fixed with the permeability vessel (18) of tubular above it.The utility model project organization is ingenious, simply novel, and dependable performance is easy to operate.Can normally carry out temperature moisture in indoor freezing and thawing process on the one hand, frozen swell and melt settlement amount is tested, on the other hand, after freezing-thawing test terminates, in the mensuration process of soil sample infiltration coefficient, farthest can avoid producing disturbance to soil sample, guarantee the accuracy of test findings.
Description
Technical field
The utility model relates to the testing equipment processing and manufacturing field that soil is relevant, be specifically related to a kind of varying head permeability experimental facility of indoor freezing and thawing equipment.
Background technology
Soil is the multiphase medium that a kind of skeleton be made up of mineral grain is filled by water and gas and formed.When the soil body is in subzero temperature environment, the moisture in soil will be frozen into ice, namely freezes.The process freezed i.e. the precipitation process of ice crystal, can make soil particle be subjected to displacement generation frost heave.During dissolving, ice-out Cheng Shui, and the large space stayed can not revert to the small spaces before freezing, and causes the soil weight to change, infiltration coefficient increases.The main varying head permeability test of quantitative analysis is determined for infiltration coefficient native after unfreezing and obtains data analysis, so the accuracy of the result of test has a great impact analysis.Along with the development of test, positive frozen soil or the research of just melting native infiltration coefficient are also become and extremely needs, but also do not have a kind of method to measure at present.
Existing technical scheme: sample soil sample after unfreezing, then carries out permeability test; Directly utilize small size soil sample to carry out freezing-thawing test, and then be transferred in penetration equipment and carry out permeability test.Both defines disturbance to soil sample all to a certain extent, and soil sample is again after several freezing-thawing test, can become very soft and be not easy to sampling and transfer, these two kinds of methods can not well take into account other related experiment simultaneously, such as: for small size soil sample, frozen-thaw process water translocation and Experiment on Temperature Distribution can not be done.
Utility model content
The utility model object is to provide a kind of varying head permeability experimental facility of indoor freezing and thawing equipment, and it can solve problem existing in background technology effectively.
In order to solve problem existing in background technology, it comprises permeability apparatus, this permeability apparatus comprises locating support 1, water supply bottle 2 and change water device 3, described locating support 1 comprises and to control separately respectively by low temperature tank and to regulate the upper cryostat dish 11 of temperature and lower cryostat dish 12, described lower cryostat dish 12 is fixed on base 13, the permeability vessel 18 of tubular is fixed with above it, its inwall of laminating is provided with and the upper cryostat dish 11 be slidably matched with it in described permeability vessel 18, on this, cryostat dish 11 is provided with the hold down gag be attached thereto above, this hold down gag is fixed on base 13 by the first connecting rod 14 being arranged on its surrounding, described upper cryostat dish 11 offers water delivering orifice 15, upper exhausr port 19 and upper liquid coolant input port 23 and upper liquid coolant escape hole 24, described lower cryostat dish 12 offers water inlet 16, lower exhausr port 17 and lower liquid coolant escape hole 25 and lower liquid coolant escape hole 26, described water inlet 16 is provided with the first conduit 4, the other end of described first conduit 4 through main valve 7 by the second conduit 5 and the 3rd conduit 6 respectively with water supply bottle 2 with become water device 3 and be connected, the second described conduit 5 is provided with the first valve 10, the 3rd described conduit 6 is provided with the second valve 8, the sidewall of described permeability vessel 18 is reserved with the hole 181 of several gap arrangement, each sensor plug sealing with it grafting and coordinate is provided with in this hole 181.
The side of described change water device 3 is provided with a support 31 that slidable adjustment is also fixing with it.
Owing to have employed above technical scheme, the utility model has following beneficial effect: project organization is ingenious, simply novel, and dependable performance is easy to operate.Can normally carry out temperature moisture in indoor freezing and thawing process on the one hand, frozen swell and melt settlement amount is tested, on the other hand, after freezing-thawing test terminates, in the mensuration process of soil sample infiltration coefficient, farthest can avoid producing disturbance to soil sample, guarantee the accuracy of test findings.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model, below in conjunction with accompanying drawing, embodiment is briefly described.
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of permeability vessel in the utility model.
Embodiment
The technological means realized to make the utility model, creation characteristic, reaching object and effect is easy to understand, below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment being clearly and completely described.
embodiment 1
Referring to Fig. 1-2, a kind of varying head permeability experimental facility of indoor freezing and thawing equipment it comprise permeability apparatus, this permeability apparatus comprises locating support 1, water supply bottle 2 and change water device 3, described locating support 1 comprises and to control separately respectively by low temperature tank and to regulate the upper cryostat dish 11 of temperature and lower cryostat dish 12, described lower cryostat dish 12 is fixed on base 13, the permeability vessel 18 of tubular is fixed with above it, its inwall of laminating is provided with and the upper cryostat dish 11 be slidably matched with it in described permeability vessel 18, on this, cryostat dish 11 is provided with the hold down gag be attached thereto above, this hold down gag is fixed on base 13 by the first connecting rod 14 being arranged on its surrounding, described upper cryostat dish 11 offers water delivering orifice 15, upper exhausr port 19 and upper liquid coolant input port 23 and upper liquid coolant escape hole 24, described lower cryostat dish 12 offers water inlet 16, lower exhausr port 17 and lower liquid coolant escape hole 25 and lower liquid coolant escape hole 26, described water inlet 16 is provided with the first conduit 4, the other end of described first conduit 4 through main valve 7 by the second conduit 5 and the 3rd conduit 6 respectively with water supply bottle 2 with become water device 3 and be connected, the second described conduit 5 is provided with the first valve 10, the 3rd described conduit 6 is provided with the second valve 8, the sidewall of described permeability vessel 18 is reserved with the hole 181 of several gap arrangement, each sensor plug sealing with it grafting and coordinate is provided with in this hole 181, make it also can carry out conventional freezing-thawing test, comprise soil sample internal moisture migration in observation freezing process, temperature variation etc., and the monitoring of these data needs temperature sensor and moisture transducer to be inserted in the soil body obtains, so preformed hole 181 is popped one's head in the soil body to be inserted by relevant sensor.
Described hold down gag comprises and is positioned at location-plate 9 above cryostat dish 11 and fixed head 20, be connected and fixed integral by second connecting rod 21 between described location-plate 9 and fixed head 20, the two bottom sides of described location-plate 9 is fixed on base 13 by first connecting rod 14, the guide pole 91 of clearance sliding fit is with it provided with in the middle part of it, the bottom of this guide pole 91 is fixedly connected with the middle part of upper cryostat dish 11 through fixed head 20, be connected and fixed by fastener 22 between described location-plate 9 and guide pole 91, this fastener 22 terminates rear fixing upper cryostat dish 11 for freezing-thawing test, prevent in permeability test process because the pressure of water causes the phenomenon of upper cryostat dish 11 movement, thus impact experiment accuracy.
The side of described change water device 3 is provided with a support 31 that slidable adjustment is also fixing with it.
embodiment 2
By the varying head permeability experimental facility of a kind of indoor freezing and thawing equipment described in embodiment 1, it comprises permeability apparatus and carries out the operation of varying head permeability test, and its concrete operation steps is as follows:
1. after freezing-thawing test terminates, treat that soil sample thaw collapse terminates, with the fixing upper cryostat dish of fastener 22, ensure that in permeability test process, cryostat dish 11 can not produce because of water flow pressure mobile;
2. the height adjusting varying head device 3 makes head meet testing requirements, then main valve 7 is closed, open the first valve 10 and the second valve 8, test by becoming water device 3 pairs of water level, after water level reaches, close the second valve 8 and open main valve 7, confession water saturation is carried out by water supply bottle 2 couples of soil sample a, open water delivering orifice 15 and lower exhausr port 17 in saturated process simultaneously, water progressively gets rid of the air bottom permeability vessel in the process entering soil sample a, until from water delivering orifice 15 overflow water bubble-free, then progressively water delivering orifice 15 and lower exhausr port 17 is closed, continue water supply 12 hours, soil sample is made to reach complete state of saturation,
3. after soil sample reaches complete state of saturation, closing the first valve 10, opening the second valve 8 carries out infiltration coefficient mensuration by becoming water device 3;
4. in varying head device 3, inject pure water, head is made to rise to predetermined altitude, head height is according to the porousness of soil sample a structure, generally should not be greater than 2m, cut off the water supply after stable level, open the second valve 8 and main valve 7, make water by soil sample a, open water delivering orifice 15 simultaneously but have water to overflow water delivering orifice 15 and waterflow stabilization time start to survey initial head height and the initial time of note varying head device 3, note head and the change of time are surveyed in interval on schedule, and survey the water temperature of note water delivering orifice 15;
5. by the water level conversion height in varying head device 3, treat that stable level carries out surveys note head and time variations again, revision test 5-6 time, the infiltration coefficient starting to measure under head when difference is when allowing in difference range, and end is tested; The calculating of varying head permeability test is as follows:
Wherein:
The sectional area cm2 of a-varying head pipe
L----water flow path (height of soil sample) cm
A----soil sample sectional area cm2
H1----initial water grease head highness cm
H2-----end of a period head height cm
6. varying head permeability test once dismantles each device after terminating, and again can carry out freezing-thawing test, guarantees the continuity of freezing-thawing test and the integrality of soil sample.
Because various seepage problem causes the solution of experimental data deviation in the present embodiment:
1. the permeability vessel 18 in the varying head permeability experimental facility of a kind of indoor freezing and thawing equipment used due to the varying head permeability test in the present embodiment also needs to consider conventional freezing-thawing test, therefore its sidewall is reserved with the hole 181 of several gap arrangement, and this some holes 181 easily occurs oozing water problem (even if each sensing probe is not extracted in the process of operation, also there will be infiltration in a small amount), the no matter accuracy of the whole test figure of impact that the size of aquifer yield all can be serious, be directed to this, while each sensing probe of maintenance is not extracted, the outside of permeability vessel 18 is blocked water by band and fluid sealant, thus effectively ensure that in process of the test, the moisture of soil sample inside does not run off,
2. circumference neighbouring also there will be in permeability test process and freezing process of going up cryostat dish 11, leaks, its solution embeds installation 4 road circle O-ring seal respectively in the both sides up and down of upper cryostat dish 11 periphery, O-ring seal after fixing and the inwall of permeability vessel 18 are interference fit, on O-ring seal, finally apply one deck vaseline (reduce friction, also can play the impermeable role of any simultaneously);
3. in permeability test process, top still there will be and leaks, but is found by test, and just no longer change after water level rises to certain altitude, at this time carry out permeability test again, the data of test are only accurately.Simultaneously, soil sample volume is larger, so carrying out in variable head permeability test process, particularly early stage is in order to make soil sample reach capacity, the confession water saturation will carrying out about 12 hours is found by test, be exactly continue to supply water to soil sample by varying head device in fact, after about 12 hours, just can carry out permeability test.
comparative example 3
Carry out the contrast of varying head permeability test below in conjunction with the permeability experimental facility described in conventional varying head penetration equipment and embodiment 1, the soil sample that this contrast test adopts is silty clay, and its infiltration coefficient scope is 10
-5~ 10
-6its concrete infiltration coefficient is see table one;
Table one. the infiltration coefficient index contrast table that the varying head permeability experimental facility of conventional varying head penetration equipment and a kind of indoor freezing and thawing equipment is concrete
| Conventional varying head penetration equipment | A kind of varying head permeability experimental facility of indoor freezing and thawing equipment |
| 2*10 -5 | 3*10 -5 |
| 2.6*10 -5 | 3.6*10 -5 |
The infiltration coefficient that the varying head permeability experimental facility of a kind of indoor freezing and thawing equipment as can be seen from the above table in embodiment 1 and conventional varying head penetration equipment are tested is comparatively close, thus demonstrates the reliability of this permeability experimental facility.
Last it is noted that above embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to previous embodiment, those of ordinary skill in the art is to be understood that, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (2)
1. the varying head permeability experimental facility of an indoor freezing and thawing equipment, it is characterized in that it comprises permeability apparatus, this permeability apparatus comprises locating support (1), water supply bottle (2) and change water device (3), described locating support (1) comprises and to control separately respectively by low temperature tank and to regulate upper cryostat dish (11) and the lower cryostat dish (12) of temperature, described lower cryostat dish (12) is fixed on base (13), the permeability vessel (18) of tubular is fixed with above it, its inwall of laminating is provided with and the upper cryostat dish (11) be slidably matched with it in described permeability vessel (18), on this, cryostat dish (11) is provided with the hold down gag be attached thereto above, this hold down gag is fixed on base (13) by the first connecting rod (14) being arranged on its surrounding, described upper cryostat dish (11) offers water delivering orifice (15), upper exhausr port (19) and upper liquid coolant input port (23) and upper liquid coolant escape hole (24), described lower cryostat dish (12) offers water inlet (16), lower exhausr port (17) and lower liquid coolant escape hole (25) and lower liquid coolant escape hole (26), described water inlet (16) is provided with the first conduit (4), the other end of described first conduit (4) through main valve (7) by the second conduit (5) and the 3rd conduit (6) respectively with water supply bottle (2) with become water device (3) and be connected, described the second conduit (5) is provided with the first valve (10), the 3rd described conduit (6) is provided with the second valve (8), the sidewall of described permeability vessel (18) is reserved with the hole (181) of several gap arrangement, each sensor plug sealing with it grafting and coordinate is provided with in this hole (181).
2. the varying head permeability experimental facility of a kind of indoor freezing and thawing equipment according to claim 1, is characterized in that the side of described change water device (3) is provided with a support (31) that slidable adjustment is also fixing with it.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520167673.6U CN204514767U (en) | 2015-03-24 | 2015-03-24 | A kind of varying head permeability experimental facility of indoor freezing and thawing equipment |
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| CN201520167673.6U CN204514767U (en) | 2015-03-24 | 2015-03-24 | A kind of varying head permeability experimental facility of indoor freezing and thawing equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104819920A (en) * | 2015-03-24 | 2015-08-05 | 河南理工大学 | Varying-head permeability experiment apparatus for indoor freezing and thawing equipment |
| CN105092450A (en) * | 2015-08-07 | 2015-11-25 | 中国地质大学（武汉） | Low-permeability saturated clay permeation testing instrument and method |
-
2015
- 2015-03-24 CN CN201520167673.6U patent/CN204514767U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104819920A (en) * | 2015-03-24 | 2015-08-05 | 河南理工大学 | Varying-head permeability experiment apparatus for indoor freezing and thawing equipment |
| CN105092450A (en) * | 2015-08-07 | 2015-11-25 | 中国地质大学（武汉） | Low-permeability saturated clay permeation testing instrument and method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150729 Termination date: 20190324 |
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| CF01 | Termination of patent right due to non-payment of annual fee |