CN104914028B - False three axle high pressure infiltration experiment instrument - Google Patents

False three axle high pressure infiltration experiment instrument Download PDF

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Publication number
CN104914028B
CN104914028B CN201510229210.2A CN201510229210A CN104914028B CN 104914028 B CN104914028 B CN 104914028B CN 201510229210 A CN201510229210 A CN 201510229210A CN 104914028 B CN104914028 B CN 104914028B
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China
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pressure
soil sample
undisturbed soil
base
cover
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CN201510229210.2A
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CN104914028A (en
Inventor
高宗军
于晨
冯建国
王敏
孟祥旭
张洪英
田红
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山东科技大学
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Abstract

A kind of present invention offer three axle high pressure infiltration experiment instrument of vacation, belong to Geotechnical Engineering field, and it is applied to consolidation and non-consolidation ground, is especially the non-infiltration for consolidating plasticity cohesive undisturbed soil sample and filter salt aptitude tests.The present invention is using undisturbed soil sample as experiment soil sample, utilize false three axle principles, by being arranged flexible silicon gum cover pipe outside undisturbed soil sample, and it is arranged on the outside of flexible silica gel sleeve pipe and has borehole jack cylinder for support undisturbed soil sample, confined pressure is applied to undisturbed soil sample by the confined pressure hole for being opened in side wall, confined pressure is more than axle when pressing, and High-Pressure Water is only inside undisturbed soil sample by rather than from seepage on the composition surface of undisturbed soil sample and encapsulant, so as to reach sealing effectiveness under high pressure;By screw connection between the upper top cover and lower bottom base and side wall of the present invention, undisturbed soil sample filling or placement process can be avoided to cause deformation.The present invention is simple in construction, and the actual state of underground aqueous system can be simulated, and solve thes problems, such as that high pressure undisturbed soil sample permeance property is tested.

Description

False three axle high pressure infiltration experiment instrument
Technical field
The present invention relates to Geotechnical Engineering field, specifically a kind of consolidation and non-consolidation ground, especially of being applied to It is the axle high pressure infiltration experiment instrument of vacation three for the infiltration and filter salt aptitude tests of non-consolidation plasticity cohesive undisturbed soil sample.
Background technology
When the solution of various concentrations splits pellicle both sides, chemosmosis occurs, hydrone is by pellicle from low dense The solution of degree enters in the solution of high concentration.If applying certain pressure in the side of high concentration, the infiltration of hydrone can be made Carry out round about, so that by solute retention in high concentration side, and form a concentration and increase band, here it is reverse osmosis membrane Filter the general principle of salt.
In the aqueous system of underground, the situation that aquiclude both sides form certain head difference is relatively common.East China China Beijing original area, degree of saltiness water layer alternating layers, with a large amount of exploitations of deep fresh water resource, formed between deep, shallow water-bearing layer larger Head difference.The height mineralising salt water of superficial part after the aquiclude leakage-releasing water that underlies is to deep fresh-water aquifer, not because Occur obvious " salinization " for the leakage-releasing water of salt water, or deep fresh water aquifer is by the degree of salinization, do not envision that It is serious.Whether because aquiclude is in the case where larger head difference is driven, while through water, the salinity of salt water is blocked The salinity of either salt water is adsorbed(Storage)In aquicludeObviously, salinity is blocked in salt water layer or is stored In aquiclude, the process that enables the water through aquiclude to desalinate is called " filter salt ".
In view of such consideration, probes into aquiclude film effect and filter salt functional, the water for causing North China is provided Evaluate and its develop prospect expected from change in source.In order to verify the film effect of aquiclude and filter salt effect, it is necessary to carry out Permeability test.
The main comprise material of aquiclude is cohesive soil, native CLAY MINERALS AND THEIR SIGNIFICANCE using montmorillonite, illite, kaolinite as It is main.Existing penetration testing equipment is mainly darcy test instrument, but darcy test instrument is only applicable to low pressure or minute-pressure.Common high pressure Penetration equipment is only applicable to the solid rock of consolidation.Although popular triaxial pressure meter can survey high pressure on the market, only it is applicable In the solid rock of consolidation, sticky soil sample is not suitable for, be not suitable for particularly for unconsolidated, loose soft cohesive soil Test under the conditions of sample original state, and pressure failure test can only be done, permeability test can be also served as sometimes, but can not do filter salt (Using sticky soil sample as permeable membrane)Experiment.Utilize oozing designed by cohesive undisturbed soil sample and water stop sealing material as filler Saturating test equipment, water-stagnating effect is bad under high pressure for it, main reason is that the following aspects:
1st, the penetrating power of sticky soil sample is very poor, and soil sample is not easy to combine with other water stop sealing materials;
2nd, water stop sealing material general in society, as glass cement, leak stopping spirit equal strength are inadequate, slightly pressure fails;With Commercial clay is as water stop sealing material, and it can not be bonded between soil sample, especially easy to crack, water saturation after moisture reduction Intensity can reduce afterwards;Although the water-stagnating effect of cement is satisfied by condition with intensity, gap can not remove between sticky soil sample, Liquid flows through along crack;
3rd, confined pressure caused by above-mentioned four kinds of water stop sealing materials is respectively less than the axle pressure of sticky soil sample.
Therefore, High-Pressure Water how is allowed only inside cohesive undisturbed soil sample by rather than from soil sample and water stop sealing material Composition surface on seepage be develop high pressure infiltration experiment instrument success or failure key.
The content of the invention
The technical assignment of the present invention is in view of the shortcomings of the prior art, there is provided one kind tests undisturbed soil using false three axle principles The special test equipment of sample -- false three axle high pressure infiltration experiment instrument, it is close in flexible silica gel sleeve pipe by the way that undisturbed soil sample is coated on Envelope, solves the sealing problem of soil sample perisporium using the method for confined pressure extruding flexible wall is added.
The technical solution adopted for the present invention to solve the technical problems is:
False three axle high pressure infiltration experiment instrument, it is characterised in that including upper top cover, lower bottom base and connection upper top cover and under The side wall of base, upper top cover, lower bottom base and side wall surround closed cavity, and internal head cover, interior base, use are mounted with the closed cavity In the flexible silica gel sleeve pipe for coating undisturbed soil sample and there is borehole jack cylinder, confined pressure hole, the external confined pressure in confined pressure hole are offered in the middle part of side wall Pressure gauge, confined pressure pressue device are applied confined pressure to undisturbed soil sample by confined pressure hole and acted on simulated formation confined pressure;
The internal head cover is arranged on below upper top cover, and is provided with downward projection of peripheral flange in its bottom, internal head cover with The intake tunnel to connect, the outer spindle pressure pressure table of intake tunnel are provided with upper top cover;The interior base is arranged on lower bottom base Side, and the peripheral flange projected upwards is provided with the top of it, exhalant canal is provided with interior base, water storage cavity is provided with lower bottom base, The pressure measurement apopore being connected with the external world is opened up on water storage cavity;The bottom surface of the internal head cover and the top surface of interior base offer respectively The groove of water filter plate is placed, surrounds undisturbed soil sample permeation chamber between water filter plate, internal head cover, interior base and side wall, above-mentioned intake tunnel, Permeation chamber, exhalant canal, water storage cavity and pressure measurement apopore are sequentially communicated;
The flexible silica gel sleeve pipe is close to the outside for being set in internal head cover and interior base peripheral flange, outside flexible silica gel sleeve pipe Side is arranged with borehole jack cylinder, has borehole jack cylinder to be placed between internal head cover and interior base, has pre- between borehole jack cylinder and flexible silica gel sleeve pipe Leave space and form confined pressure chamber.
The flexible silica gel sleeve pipe is reinforced using sealing steel card with the outside of internal head cover and interior base peripheral flange and sealed.
It is described to there is borehole jack cylinder to offer the groove for elastic sealing steel card up and down.
Top inner chamber is provided between the intake tunnel and water filter plate, bottom inner chamber is provided between exhalant canal and water filter plate.
Above and below the water filter plate and undisturbed soil sample steel gauze is provided between contact surface.
The interior base and internal head cover are in contact by O-ring seal with side wall respectively.
The internal head cover upper surface is in contact by interior sealing cushion rubber with upper top cover.
The interior base lower surface is in contact by inner seal ring with lower bottom base..
The upper top cover and lower bottom base are screwed in side wall upper and lower end face respectively.
Hard ground or non-consolidation ground of the undisturbed soil sample for consolidation.
Compared with prior art, caused beneficial effect is the axle high pressure infiltration experiment instrument of vacation three of the present invention,
1st, using false three axle principles, flexible silicon gum cover pipe is arranged outside undisturbed soil sample, sticky soil sample is applied by confined pressure hole Add confined pressure, when confined pressure is more than axle pressure, High-Pressure Water is only by rather than from undisturbed soil sample and encapsulant inside undisturbed soil sample Composition surface on seepage, so as to reaching sealing effectiveness under high pressure;
2nd, be cased with borehole jack cylinder on the outside of flexible silica gel sleeve pipe, undisturbed soil sample played a supporting role, upper top cover and lower bottom base with By screw connection without using screw thread, such design can avoid undisturbed soil sample filling or placement process because of upper top between side wall Lid or lower bottom base knob and cause deformation;
3rd, flexible silica gel sheath pipe collar muscle internal head cover and interior base, such design can effectively be solved into original state with sealing steel card The sealing problem of soil sample;
4th, internal head cover, sealing rubber ring is encrypted between interior base and outer wall, between internal head cover and upper top cover, interior base and lower bottom base Between plus interior sealing cushion rubber, such design can effectively solve the sealing problem of confined pressure chamber;
5th, permeation chamber places water filter plate and steel gauze respectively up and down, is advantageous to water under high pressure a fluid stream and is uniformly applied on undisturbed soil sample Pressure, and prevent water under high pressure a fluid stream by undisturbed soil sample(Especially it is the non-sticky soil sample of consolidation)Breakdown;
6th, top inner chamber is provided between intake tunnel and water filter plate, bottom inner chamber is provided between exhalant canal and water filter plate, so Design High-Pressure Water can be made to be evenly distributed on whole water filter plate;
To sum up, the axle high pressure infiltration experiment instrument of vacation three of the invention, it is former using false three axles using undisturbed soil sample as experiment soil sample Reason, the actual state of underground aqueous system is simulated, its is simple in construction, operation and it is easy to use, be applicable to consolidation with Non- consolidation ground, infiltration and filter salt aptitude tests in particular for non-consolidation plasticity cohesive undisturbed soil sample, can effectively solve height The problem of pressing the test of undisturbed soil sample permeance property.
Brief description of the drawings
Accompanying drawing 1 is the structural representation of the false three axle high pressure infiltration experiment instrument of the present invention;
Accompanying drawing 2 is that 1# of the present invention tests axle pressure, confined pressure and percolate(It should be stated herein with table 1 unanimously)Volume is with the time Change curve;
Accompanying drawing 3 is that 2# of the present invention tests axle pressure, confined pressure and percolate(It should be stated herein with table 2 unanimously)Volume is with the time Change curve.
In figure, 1, upper top cover, 2, internal head cover, 3, interior base, 4, lower bottom base, 5, side wall, 6, permeation chamber, 7, screw, 8, enclose Press hole, 9, flexible silica gel sleeve pipe, 10, have a borehole jack cylinder, 11, O-ring seal, 12, interior sealing cushion rubber, 13, intake tunnel, 14, water storage Chamber, 15, sealing steel card, 16, confined pressure chamber, 17 axle pressure pressure tables, 18, confined pressure pressure gauge, 19, connecting tube, 20, pressure measurement apopore, 21st, steel gauze, 22, water filter plate, 23, top inner chamber, 24, bottom inner chamber, 25, exhalant canal.
Embodiment
1-3 is described in detail below to the axle high pressure infiltration experiment instrument of vacation three of the present invention below in conjunction with the accompanying drawings.
As shown in Figure 1, the axle high pressure infiltration experiment instrument of vacation three of the invention, its structure include upper top cover 1, lower bottom base 4, with And the side wall 5 of connection upper top cover 1 and lower bottom base 4, upper top cover 1 are fixed on the upper surface of side wall 5 by screw 7, lower bottom base 4 passes through spiral shell Silk 7 is fixed on the lower surface of side wall 5, and the middle part of side wall 5 offers confined pressure hole 8, and confined pressure pressue device gives sticky soil sample by confined pressure hole 8 Apply confined pressure to act on simulated formation confined pressure, confined pressure hole 8 passes through the external confined pressure pressure gauge 18 of connecting tube 19.
The upper top cover 1, lower bottom base 4 and side wall 5 surround closed cavity, and internal head cover 2, interior bottom are mounted with the closed cavity Seat 3, the flexible silica gel sleeve pipe 9 for coating undisturbed soil sample and there is borehole jack cylinder 10, interior base 3 and internal head cover 2 are respectively by close Sealing rubber ring 11 is in contact with side wall 5, and the upper surface of internal head cover 2 is in contact by interior sealing cushion rubber 12 with upper top cover 1, interior base 3 lower surfaces are in contact by interior sealing cushion rubber 12 with base 4.
The internal head cover 2 is arranged on the lower section of upper top cover 1, and is provided with downward projection of peripheral flange, internal head cover 2 in its bottom Pass through the outer spindle pressure pressure table 17 of connecting tube 19 provided with the intake tunnel 13 to connect, intake tunnel 13 with upper top cover 1;It is described Interior base 3 is arranged on the top of lower bottom base 4, and the peripheral flange projected upwards is provided with the top of it, leads in interior base 3 provided with water outlet Road 25, is provided with water storage cavity 14 in lower bottom base 4, is opened up on water storage cavity 14 and the extraneous pressure measurement apopore 20 being connected;Internal head cover 2 The top surface of bottom surface and interior base 3 offers the groove for placing water filter plate 22 respectively, and top is provided between intake tunnel 13 and water filter plate 22 Inner chamber 23, bottom inner chamber 24 is provided between exhalant canal 25 and water filter plate 22, between water filter plate 22 and the upper and lower contact surface of undisturbed soil sample Provided with steel gauze 21, undisturbed soil sample permeation chamber 6, above-mentioned water inlet are surrounded between water filter plate 22, internal head cover 2, interior base 3 and side wall 5 Passage 13, permeation chamber 6, exhalant canal 25, water storage cavity 14 and pressure measurement apopore 20 are sequentially communicated;The flexible silica gel sleeve pipe 9 is tight Patch is set in the outside of internal head cover 2 and the peripheral flange of interior base 3, and reinforces sealing, flexible silica gel sleeve pipe 9 using sealing steel card 15 Outer sheath is provided with borehole jack cylinder 10, has borehole jack cylinder 10 to be placed between internal head cover 2 and interior base 3, there is borehole jack cylinder 10 and flexible silica gel Space is reserved between sleeve pipe 9 and forms confined pressure chamber 16, has borehole jack cylinder to offer the groove for elastic sealing steel card 15 about 10.
The axle high pressure infiltration experiment instrument of vacation three of the present invention, the undisturbed soil sample can or non-consolidation ground native for competent rock (Especially for non-consolidation plasticity cohesive undisturbed soil sample).The present embodiment illustrates its specific workflow by taking sticky soil sample as an example:
1st, sample preparation:Sticky soil sample is processed into the cylindrical sample of accurate dimension;
2nd, setting-out seals:
1)Flexible silica gel sleeve pipe 9 is caught in the interior base 3 for having placed water filter plate 22 and steel gauze 21, flexible silica gel sleeve pipe 9 Downside is fixed using sealing steel card 15;
2)Sample is put into flexible silica gel sleeve pipe 9;
3)There to be borehole jack cylinder 10 to be enclosed on the flexible outside of silica gel sleeve pipe 9, be placed in interior base 3;
4)The sealing steel card 15 do not tightened is enclosed on the flexible upside of silica gel sleeve pipe 9;
5)Steel gauze 21 above sample and water filter plate 22 are placed, internal head cover 2 is caught in flexible silica gel sleeve pipe 9, will be upper Side sealing steel card 15 is tightened;
6)It is overall by more than to put on lower bottom base 4, side wall 5 is put, side wall 5 and lower bottom base 4 are fixed, confined pressure chamber 16 It is interior to be full of water;
7)Upper top cover 1 is covered, and fixed with side wall 5.
3rd, test:Add confined pressure, water filling, test(Water filling axle pressure is less than confined pressure)Water flows out from pressure measurement apopore 20, accesses and oozes Filtrate.
1)1# experimental samples and condition
With samplers sample undisturbed soil sample, sample position is Renqiu, and the m of depth selection 90.60 ~ 90.90, lithology is clay, It is processed into the mm of diameter 85,100 mm of height cylindrical sample, axle pressure:0.150 ~ 0.450 Mpa, confined pressure:0.310~ 0.575 Mpa, 11.0 DEG C of room temperature, 15.9 DEG C of water temperature, NaCl solution concentration:10 g/L;
2)1# experimental conditions
29 days 16 January in 2015:10 start experiments, every 5 min observe and record the number of axle pressure pressure table and confined pressure pressure gauge Value changes and the water outlet situation of pressure measurement apopore 20,20:30 to start to increase observation interval be 10 min, in experimentation, Axle pressure, confined pressure slowly rise, next day 00:00 percolate is begun to flow out, each afterwards hour sampling and measuring, and every 9 hours are a collection of Secondary collection.Experimental period lasts 2980 minutes, about 50 hours, finally gives the percolate that cumulative volume is 162.5ml.
Axle pressure, confined pressure and percolate volume dependency relation are shown in Fig. 2.
From Figure 2 it can be seen that 7:Start percolate occur after 50, confined pressure pressure value changes and changed with axle pressure pressure, and axle pressure is got over Greatly, confined pressure is bigger, and flow also has more closely related relation with pressure increase and decrease.
This experiment obtains the water sample of 5 batches altogether, to verify the percolate salt content of different time sections.Using nitric acid Argentometry determines NaCl concentration.Details see the table below 1.
Coefficient of permeability K=7.12E-08 cm/s, NaCl clearances are about 0.25.
The 1# of table 1. experiment NaCl concentration measure
3)2# experimental samples and condition
With samplers sample undisturbed soil sample, sample position is Renqiu Nan Wulipu villages, the m of depth selection 119.5 ~ 119.8, Lithology is dauk, is processed into the mm of diameter 79,100 mm of height cylindrical sample, axle pressure:0.330~0.6150 Mpa, confined pressure:0.480 ~ 0.618 Mpa, 14.0 DEG C of room temperature, 16 DEG C of water temperature, NaCl solution concentration:10 g/L;
4)2# experimental conditions
On 2 3rd, 2015 21:00 start experiment, every 5 min observe and record the numerical value of axle pressure pressure table and confined pressure pressure gauge Change and the water outlet situation of pressure measurement apopore 20.00:It is 10 minutes that 30, which start to observe and record time interval, which increases,.Experimentation In, axle pressure, confined pressure slowly rise.Next day 03:40 percolates are begun to flow out, afterwards every 1 hour sampling and measuring, for every eight hours for One batch is collected.Experimental period lasts 3700 minutes, about 61 hours 40 points, finally give cumulative volume be 200.05ml diafiltration Liquid.
Axle pressure, confined pressure and percolate volume dependency relation are shown in Fig. 3.
From the figure 3, it may be seen that confined pressure pressure value changes and changed with axle pressure pressure, axle pressure is bigger, and confined pressure is bigger, and experiment starts to add There is water outlet for the first time after 40 minutes 6 hours in pressure;Water yield and pressure increase and decrease dependency relation are little.
This experiment obtains the water sample of 7 batches altogether, to verify the percolate salt content of different time sections.Using nitric acid Argentometry determines NaCl concentration.Refer to table 2.
Coefficient of permeability K=3.71E-08 cm/s, NaCl clearances are about 0.2.
The 2# of table 2. experiment NaCl concentration measure
4th, after experiment terminates, upper top cover 1 is beaten by two on upper top cover 1 screws 7 for being used to aid in opening upper top cover 1 Open, sticky soil sample is taken out, preserved.
Axle high pressure infiltration experiment instrument its processing and fabricating of vacation three of the present invention is simple and convenient, and processing shown in by specification accompanying drawing is made Work.
It is the known technology of those skilled in the art in addition to the technical characteristic described in specification.

Claims (3)

1. false three axle high pressure infiltration experiment instrument, it is characterised in that including upper top cover, lower bottom base and connection upper top cover and bottom The side wall of seat, upper top cover, lower bottom base and side wall surround closed cavity, internal head cover, interior base are mounted with the closed cavity, is used for Coat the flexible silica gel sleeve pipe of undisturbed soil sample and have borehole jack cylinder, confined pressure hole, the external confined pressure pressure in confined pressure hole are offered in the middle part of side wall Power table, confined pressure pressue device are applied confined pressure to undisturbed soil sample by confined pressure hole and acted on simulated formation confined pressure;
The internal head cover is arranged on below upper top cover, and is provided with downward projection of peripheral flange, internal head cover and upper top in its bottom The intake tunnel to connect, the outer spindle pressure pressure table of intake tunnel are provided with lid;The interior base is arranged on above lower bottom base, and The peripheral flange projected upwards is provided with the top of it, exhalant canal is provided with interior base, water storage cavity, water storage cavity are provided with lower bottom base On open up and the extraneous pressure measurement apopore being connected;The bottom surface of the internal head cover and the top surface of interior base offer placement filter respectively The groove of water plate, undisturbed soil sample permeation chamber, above-mentioned intake tunnel, infiltration are surrounded between water filter plate, internal head cover, interior base and side wall Chamber, exhalant canal, water storage cavity and pressure measurement apopore are sequentially communicated;
The flexible silica gel sleeve pipe is close to the outside for being set in internal head cover and interior base peripheral flange, flexible silica gel sleeve pipe outer sheath Provided with borehole jack cylinder, there is borehole jack cylinder to be placed between internal head cover and interior base, have and be reserved between borehole jack cylinder and flexible silica gel sleeve pipe Space forms confined pressure chamber;
The flexible silica gel sleeve pipe is reinforced using sealing steel card with the outside of internal head cover and interior base peripheral flange and sealed;It is described to have Borehole jack cylinder offers the groove for elastic sealing steel card up and down;
Top inner chamber is provided between the intake tunnel and water filter plate, bottom inner chamber is provided between exhalant canal and water filter plate;
Above and below the water filter plate and undisturbed soil sample steel gauze is provided between contact surface;
The interior base and internal head cover are in contact by O-ring seal with side wall respectively;The internal head cover upper surface passes through interior sealing Cushion rubber is in contact with upper top cover;The interior base lower surface is in contact by inner seal ring with lower bottom base.
2. false three axles high pressure infiltration experiment instrument according to claim 1, it is characterised in that the upper top cover and lower bottom base point It is not screwed in side wall upper and lower end face.
3. false three axles high pressure infiltration experiment instrument according to claim 1, it is characterised in that the undisturbed soil sample is consolidation Hard ground or non-consolidation ground.
CN201510229210.2A 2015-05-08 2015-05-08 False three axle high pressure infiltration experiment instrument CN104914028B (en)

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Publication number Priority date Publication date Assignee Title
CN105403458B (en) * 2015-12-12 2018-04-24 中原工学院 Tensile test device and its operating method based on normal triaxial instrument
CN105954109A (en) * 2016-04-29 2016-09-21 温州大学 Vacuum consolidation test device of unit soil sample under triaxial state
CN106124366A (en) * 2016-08-31 2016-11-16 温州大学 The undisturbed soil sampling device used in undisturbed soil contaminant transportation test method under load action and test
CN108226006B (en) * 2017-12-28 2020-07-07 哈尔滨工业大学 Method for testing fluid permeability of cement-based material

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CN2826404Y (en) * 2005-06-29 2006-10-11 长春工程学院 Pressurized flexible-wall permeameter
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CN204789256U (en) * 2015-05-08 2015-11-18 山东科技大学 False triaxial high pressure permeability test appearance

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CN2826404Y (en) * 2005-06-29 2006-10-11 长春工程学院 Pressurized flexible-wall permeameter
CN101603913A (en) * 2009-06-30 2009-12-16 安徽省(水利部淮河水利委员会)水利科学研究院 Permeability coefficient of cement soil determinator and assay method thereof
CN204789256U (en) * 2015-05-08 2015-11-18 山东科技大学 False triaxial high pressure permeability test appearance

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