CN106153520B - Ultrafiltration test device for undisturbed clay - Google Patents

Ultrafiltration test device for undisturbed clay Download PDF

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Publication number
CN106153520B
CN106153520B CN201610652799.1A CN201610652799A CN106153520B CN 106153520 B CN106153520 B CN 106153520B CN 201610652799 A CN201610652799 A CN 201610652799A CN 106153520 B CN106153520 B CN 106153520B
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base
pressure
liquid
ultrafiltration
cavity
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CN106153520A (en
Inventor
高宗军
时孟杰
张洪英
夏璐
牟林凯
刘久潭
董涛
陆瀛
林海斌
王晗
文坦
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Shandong University of Science and Technology
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Shandong University of Science and Technology
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082Investigating permeability by forcing a fluid through a sample
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082Investigating permeability by forcing a fluid through a sample
    • G01N15/0826Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change

Abstract

The invention discloses an original state clay ultrafiltration test device, which comprises an ultrafiltration tester, a manual pressurizing device and a self-gravity pressurizing device; the ultrafiltration tester is provided with a lateral sampling port, a solenoid is installed at the lateral sampling port, threaded interfaces matched with the solenoid are arranged on the side wall and the flexible silica gel sleeve, and a flexible filter screen is arranged on the flexible silica gel sleeve corresponding to the lateral sampling port; the manual pressurizing device comprises a liquid storage tank, a water pressing well structure for manually pressing out liquid stored in the liquid storage tank is arranged on the liquid storage tank, and a liquid injection port is arranged above one end of the liquid storage tank; the self-gravity pressurizing device comprises a hydraulic cavity, a pressure guide column is arranged in the hydraulic cavity, and the top end of the pressure guide column is connected with the pressure bearing plate; the liquid outlet of the pressurized-water well structure is communicated with the hydraulic cavity through a hydraulic connecting pipe, and the hydraulic cavity is communicated with the liquid inlet channel or the confining pressure hole through a pressure stabilizing output pipe. The invention has more stable and accurate pressure control and reduces the test error in the test process.

Description

Ultrafiltration test device for undisturbed clay
Technical Field
The invention relates to an ultrafiltration test device for laboratory test of the permeability and salt filtering capacity of undisturbed clay.
Background
The main component of the weak permeable layer is clay, and the clay minerals in the clay mainly comprise montmorillonite, illite and kaolinite. To verify the salt leaching effect of the weakly permeable layer, a high pressure permeation test was performed. The existing penetration testing equipment is mainly a Darcy tester, but the Darcy tester is only suitable for low pressure or micro pressure. Conventional high pressure infiltration equipment such as commercially available three-axis pressure gauges, while capable of measuring high pressures, are only suitable for use with hard rock to be consolidated and are not suitable for use with clay samples.
The applicant filed 5/8/2015 with chinese patent application No. 201510229210.2 discloses a pseudo-triaxial high-pressure penetration tester, which solves the problem of sealing the circumferential wall of a soil sample by pressing a flexible wall with confining pressure, and can be used for testing the penetration and salt filtration capacity of a viscous undisturbed soil sample. However, the applicant finds that in the subsequent test process, the pressure of the pressurizing pump used in combination with the tester is unstable in the axial pressure and confining pressure processes, so that a large test error exists. In addition, the pseudo-triaxial high-pressure penetration tester can only sample at the bottom outlet, has fewer sampling points, and cannot analyze the water quality change condition of the percolate in the clay.
Disclosure of Invention
Based on the technical problem, the invention provides an original-state clay ultrafiltration test device.
The technical solution adopted by the invention is as follows:
an original state clay ultrafiltration test device comprises an ultrafiltration tester, a manual pressurizing device and a self-gravity pressurizing device; the ultrafiltration tester comprises an outer top cover, an outer base and a side wall connecting the outer top cover and the outer base, wherein the outer top cover, the outer base and the side wall are enclosed to form an enclosed cavity, an inner top cover, an inner base, a flexible silica gel sleeve for coating a undisturbed soil sample and a perforated sleeve are arranged in the enclosed cavity, the inner top cover is arranged below the outer top cover, a communicated liquid inlet channel is arranged in the inner top cover and the outer top cover, the liquid inlet channel is externally connected with an axial pressure gauge, the inner base is arranged above the outer base, a water outlet channel is arranged in the inner base, a water storage cavity communicated with the water outlet channel and a bottom sampling port for communicating the water storage cavity with the outside are arranged in the outer base, the inner top cover, the inner base and the flexible silica gel sleeve are enclosed to form an undisturbed soil sample permeation cavity, the perforated sleeve is sleeved outside the flexible silica gel sleeve, an confining pressure cavity is formed between the perforated sleeve and the flexible silica gel sleeve, and confining, the confining pressure hole is externally connected with a confining pressure gauge, a lateral sampling port is arranged at the corresponding position of the side wall, the perforated sleeve and the flexible silica gel sleeve, a solenoid is arranged at the lateral sampling port, threaded interfaces matched with the solenoid are arranged on the side wall and the flexible silica gel sleeve, and a flexible filter screen is arranged at the position of the flexible silica gel sleeve corresponding to the lateral sampling port; the manual pressurizing device comprises a liquid storage tank, a water pressing well structure for manually pressing out liquid stored in the liquid storage tank is arranged on the liquid storage tank, and a liquid injection port is arranged above one end of the liquid storage tank; the self-gravity pressurizing device comprises a base, a top plate and a bearing plate, wherein a supporting column is arranged between the base and the top plate, the bearing plate is sleeved on the supporting column and can move up and down along the supporting column, a pressure distribution plate is arranged on the bearing plate, a hydraulic cavity is arranged on the base, a pressure guide column is arranged in the hydraulic cavity and is connected with the bearing plate; the liquid outlet of the pressurized-water well structure is communicated with the hydraulic cavity through a hydraulic connecting pipe, the hydraulic cavity is communicated with the liquid inlet channel or the confining pressure hole through a pressure stabilizing output pipe, and the hydraulic connecting pipe and the pressure stabilizing output pipe are both provided with one-way valves.
Preferably, the lateral sampling ports are 2-5 and are arranged along the side wall at intervals from top to bottom.
Preferably, the pressurized-water well structure comprises a well body and a pressure handle, the well body is of a hollow cylindrical structure, the bottom of the well body is communicated with the lower part of the liquid storage tank through a liquid inlet pipe, a liquid outlet is formed in the upper part of the well body, a piston is arranged in the well body, and the piston is connected with the pressure handle which drives the piston to reciprocate.
Preferably, base and roof all are squarely, the support column sets up four altogether, is located the four corners department of base and roof respectively, lead the center connection of pressure column and pressure-bearing plate.
Preferably, manual pressure device sets up two altogether, is the manual pressure device of axle load and the manual pressure device of confining pressure respectively, it sets up one to follow gravity pressure device, the liquid outlet of the manual pressure device of axle load passes through hydraulic pressure connecting pipe and the hydraulic pressure chamber intercommunication from gravity pressure device, the hydraulic pressure chamber passes through steady voltage output tube and inlet channel intercommunication, the liquid outlet of the manual pressure device of confining pressure is through another hydraulic pressure connecting pipe and confining pressure hole intercommunication.
Preferably, the ultrafiltration tester is provided with a plurality of the ultrafiltration testers, the liquid inlet channel and the confining pressure hole of each ultrafiltration tester are respectively connected with a tee joint, the tee joints at the liquid inlet channels of all the ultrafiltration testers are mutually communicated, and the tee joints at the confining pressure holes of all the ultrafiltration testers are also mutually communicated.
Preferably, the bottom of inside cap is equipped with downward convex circumference flange, the top of interior base is equipped with the convex circumference flange that makes progress, flexible silica gel sleeve pipe adopts solid steel card to consolidate sealedly with the outside of inside cap and interior base circumference flange.
Preferably, the bottom surface of the inner top cover is provided with a first groove, a first water filtering plate is arranged in the first groove, the top surface of the inner base is provided with a second groove, a second water filtering plate is arranged in the second groove, a top inner cavity is arranged between the water inlet channel and the first water filtering plate, and a bottom inner cavity is arranged between the water outlet channel and the second water filtering plate.
Preferably, a steel gauze is arranged between the water filtering plate and the upper contact surface and the lower contact surface of the undisturbed soil sample.
Preferably, the inner base and the inner top cover are respectively contacted with the side wall through a first sealing rubber ring, the upper end face of the inner top cover is contacted with the outer top cover through a second sealing rubber ring, the lower end face of the inner base is contacted with the outer base through a third sealing rubber ring, and the outer top cover and the outer base are respectively fixed on the upper end face and the lower end face of the side wall through screws.
The beneficial technical effects of the invention are as follows:
1. the invention adopts the way of matching the manual pressure device with the self-gravity pressure device to mechanically add axial pressure and confining pressure to the ultrafiltration tester, compared with a pulse type pressure pump or a peristaltic pump, the pressure control is more stable and accurate, and the test error in the test process is greatly reduced.
2. Because of adopting the pure mechanical pressurizing mode of the self-gravity pressurizing device and the manual pressurizing device, the undisturbed clay ultrafiltration test device can be simultaneously provided with a plurality of ultrafiltration test instruments for carrying out a plurality of groups of test operations, the test efficiency is higher, and each ultrafiltration test instrument is provided with a tee joint at the liquid inlet channel and the confining pressure hole, so that the connection can be easily realized, the structure is simple, and the operation and the control are easy.
3. The invention adds a plurality of lateral sampling ports on the ultrafiltration tester, and can sample the exudates passing through different positions of the undisturbed soil sample according to the requirements, thereby realizing the analysis of the water quality change condition of the exudates in the clay.
4. According to the invention, the side sampling can be easily realized by installing the screw pipe at the side sampling port and arranging the threaded interfaces matched with the screw pipe on the side wall and the flexible silica gel sleeve, and the side sampling has a better sealing effect.
Drawings
The invention will be further described with reference to the following detailed description and drawings:
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of a self-gravity pressurizing device;
FIG. 3 is a schematic view of a manual pressurizing device;
FIG. 4 is a schematic diagram of the structural principle of the ultrafiltration tester;
fig. 5 is a partial enlarged view of fig. 4, mainly illustrating the structure at the lateral sampling port.
In the figure: 1-an ultrafiltration tester, 101-an outer top cover, 102-an outer base, 103-a side wall, 104-an inner top cover, 105-an inner base, 106-a flexible silica gel sleeve, 107-a perforated sleeve, 108-a liquid inlet channel, 109-an axial pressure gauge, 1010-a water outlet channel, 1011-a water storage cavity, 1012-a bottom sampling port, 1013-an original soil sample permeation cavity, 1014-a confining pressure cavity, 1015-a confining pressure hole, 1016-a confining pressure gauge, 1017-a lateral sampling port, 1018-a spiral tube, 1019-a threaded interface, 1020-a flexible filter screen, 1021-a solid seal steel card, 1022-a first filter screen, 1023-a second filter screen, 1024-a top inner cavity, 1025-a bottom inner cavity, 1026-a steel gauze screen, 1027-a screw, 1028-a connecting pipe and 2-a manual pressurizing device, 201-a liquid storage tank, 202-a water pressing well structure, 203-a liquid injection port, 2021-a well body, 2022-a pressing handle, 2023-a liquid inlet pipe, 2024-a liquid outlet, 2025-a piston, 2026-a film, 211-a shaft pressure manual pressurizing device, 212-a confining pressure manual pressurizing device, 3-a self-gravity pressurizing device, 301-a base, 302-a top plate, 303-a pressure bearing plate, 304-a supporting column, 305-a pressure distribution plate, 306-a hydraulic cavity, 307-a pressure guide column, 4-a first hydraulic connecting pipe, 5-a pressure stabilizing output pipe, 6-a tee joint, 7-a second hydraulic connecting pipe, 8-a one-way valve, 9-a first water stop valve and 10-a second water stop valve.
Detailed Description
As shown in figure 1, the undisturbed clay ultrafiltration test device comprises an ultrafiltration tester 1, a manual pressurizing device 2 and a self-gravity pressurizing device 3. As shown in fig. 4, the ultrafiltration tester 1 comprises an outer cap 101, an outer base 102, and a sidewall 103 connecting the outer cap 101 and the outer base 102, wherein the outer cap 101, the outer base 102 and the sidewall 103 define a sealed cavity, and an inner cap 104, an inner base 105, a flexible silica gel sleeve 106 for covering an undisturbed soil sample, and a perforated sleeve 107 are disposed in the sealed cavity. The inner top cover 104 is arranged below the outer top cover 101, a liquid inlet channel 108 which is communicated with the inner top cover 104 and the outer top cover 101 is arranged in the inner top cover 104, and the liquid inlet channel 108 is externally connected with an axial pressure gauge 109. The inner base 105 is arranged above the outer base 102, a water outlet channel 1010 is arranged in the inner base 105, a water storage cavity 1011 communicated with the water outlet channel and a bottom sampling port 1012 communicating the water storage cavity with the outside are arranged in the outer base 102. Interior top cap 104, interior base 105 encloses into original state soil sample infiltration chamber 1013 with flexible silica gel sleeve 106, porose sleeve 107 cover is in the outside of flexible silica gel sleeve 106, form confining pressure chamber 1014 between porose sleeve 107 and flexible silica gel sleeve 106, also form a cavity between porose sleeve 107 and lateral wall 103, confining pressure hole 1015 has been seted up on the lateral wall, confining pressure hole 1015 and above-mentioned cavity intercommunication, and then intercommunication confining pressure chamber 1014, confining pressure manometer 1016 is connected outward to the confining pressure hole, be provided with second stagnant water valve 10 in confining pressure hole department. A lateral sampling port 1017 is arranged at a corresponding position of the side wall, the perforated sleeve and the flexible silica gel sleeve, as shown in fig. 5, a screw pipe 1018 is installed at the lateral sampling port 1017, a threaded interface 1019 matched with the screw pipe is arranged on the side wall 103 and the flexible silica gel sleeve 106, and a flexible filter screen 1020 is arranged at a position of the flexible silica gel sleeve 106 corresponding to the lateral sampling port. As shown in fig. 3, the manual pressurizing device 2 includes a tank 201, a pumping well structure 202 for manually pumping out a liquid stored in the tank is provided in the tank 201, and a liquid injection port 203 is provided above one end of the tank. As shown in fig. 2, the self-gravity pressurizing device 3 includes a base 301, a top plate 302 and a pressure-bearing plate 303, a support column 304 is disposed between the base 301 and the top plate 302, and the pressure-bearing plate 303 is sleeved on the support column 304 and can move up and down along the support column. A pressure distribution plate 305 is placed on the pressure bearing plate 303, a hydraulic cavity 306 is arranged on the base 301, a pressure guide column 307 is arranged in the hydraulic cavity 306, and the top end of the pressure guide column 307 is connected with the movable pressure bearing plate 303. As shown in fig. 1, two manual pressurizing devices are provided, namely, an axial pressure manual pressurizing device 211 and a confining pressure manual pressurizing device 212, and one self-gravity pressurizing device is provided. The liquid outlet of the manual axial pressure pressurizing device 211 is communicated with the hydraulic cavity 306 of the self-gravity pressurizing device 3 through a first hydraulic connecting pipe 4, the hydraulic cavity 306 is communicated with the liquid inlet of the tee joint 6 through a pressure stabilizing output pipe 5, one of the liquid outlets of the tee joint 6 is communicated with the liquid inlet channel 108, and the other liquid outlet is closed through a first water stop valve 9. And the liquid outlet of the confining pressure manual pressurizing device is communicated with the confining pressure hole 1015 through a second hydraulic connecting pipe 7. The first hydraulic connecting pipe 4, the pressure stabilizing output pipe 5 and the second hydraulic connecting pipe 7 are all provided with one-way valves 8, so that liquid can only be transmitted in one way and cannot flow back reversely.
Above-mentioned side direction sample connection 1017 is preferred to set up 2 ~ 5, and is interval arrangement from top to bottom along the lateral wall.
As a further design of the present invention, as shown in fig. 3, the pressurized-water well structure 202 includes a well 2021 and a pressure handle 2022, the well 2021 is a hollow cylindrical structure, the bottom of the well 2021 is communicated with the lower portion of the liquid storage tank 201 through a liquid inlet pipe 2023, a liquid outlet 2024 is disposed at the upper portion of the well 2021, a piston 2025 is disposed inside the well 2021, a rubber sheet 2026 is fixed below the piston 2025, and the piston 2025 is connected to the pressure handle 2022 for driving the piston 2025 to reciprocate. The structure and the working principle are consistent with those of a common pressurized water well.
Furthermore, the base 301 and the top plate 302 are both square, the number of the support columns 304 is four, the four support columns are respectively located at four corners of the base 301 and the top plate 302, and the pressure guide columns 306 are connected with the center of the pressure bearing plate 303. The structural design can enable the bearing plate to run more stably, and further, the accurate control of the axial pressure is facilitated.
Furthermore, the ultrafiltration tester is provided with a plurality of the ultrafiltration tester, a tee joint is connected to the liquid inlet channel and the confining pressure hole of each ultrafiltration tester, the tee joints at the liquid inlet channels of all the ultrafiltration testers are communicated with each other through pipelines, and the tee joints at the confining pressure holes of all the ultrafiltration testers are also communicated with each other through pipelines. Of course, the confining pressure can also be provided by the self-gravity pressurizing device and the confining pressure manual pressurizing device together, namely, water pressed out by the confining pressure manual pressurizing device firstly enters a hydraulic cavity of the other self-gravity pressurizing device and then enters the confining pressure hole under the action of the pressure bearing plate and the pressure guide column.
Furthermore, as shown in fig. 4, a downward convex circumferential flange is arranged at the bottom of the inner top cover, an upward convex circumferential flange is arranged at the top of the inner base, and the flexible silicone sleeve is sealed with the outer sides of the inner top cover and the inner base circumferential flange by a fixing steel clamp 1021. The bottom surface of inner top cap is equipped with first recess, places first drainage board 1022 in first recess, the top surface of interior base is equipped with the second recess, places second drainage board 1023 in the second recess, be equipped with top inner chamber 1024 between inlet channel and the first drainage board, be equipped with bottom inner chamber 1025 between outlet channel and the second drainage board. And steel gauze 1026 is arranged between the upper contact surface of the first water filtering plate and the undisturbed soil sample and between the lower contact surface of the second water filtering plate and the undisturbed soil sample. Interior base and interior top cap contact with the lateral wall through first sealed rubber ring respectively, interior top cap up end contacts with outer top cap through second sealed rubber ring, interior base lower extreme face contacts with outer base through third sealed rubber ring, outer top cap and outer base are fixed in terminal surface about the lateral wall through screw 1027 respectively.
The undisturbed clay ultrafiltration test device provided by the invention is applicable to undisturbed clay which can be a non-consolidated plastic viscous undisturbed soil sample. The specific working flow of the clay sample is described by taking the clay sample as an example and combining the structure of the invention:
1. preparing a sample: processing the clay sample into a cylindrical sample with accurate size;
2. lofting and sealing:
1) the flexible silica gel sleeve 106 is clamped into the inner base 105 on which the second water filter plate 1023 and the steel gauze 1026 are placed, and the lower side of the flexible silica gel sleeve 106 is fixed by a fixing and sealing steel clamp 1021;
2) putting the cylindrical sample into a flexible silica gel sleeve 106;
3) sleeving a perforated sleeve 107 outside the flexible silica gel sleeve 106 and placing the perforated sleeve on the inner base 105;
4) sleeving the unthreading fixing and sealing steel card 1021 on the upper side of the flexible silica gel sleeve 106;
5) placing a steel gauze 1026 and a first water filtering plate 1022 above the sample, clamping the inner top cover 104 into the flexible silica gel sleeve 106, and screwing the upper fixed steel card 1021;
6) the whole body is placed on the outer base 102, the side wall 103 is sleeved, and the side wall 103 and the perforated sleeve 107 are adjusted to align the lateral sampling port 1017;
7) a screw pipe 1018 is arranged in and screwed with the flexible silica gel sleeve 106 and the threaded interface 1019 on the side wall 103;
8) filling tap water into the confining pressure cavity 1014, covering the outer top cover 101 and fixing the outer top cover and the side wall 103;
9) the liquid inlet channel 108 is connected with a pressure stabilizing output pipe 5 of the self-gravity pressurizing device through a connecting pipe 1028;
10) the first hydraulic connecting pipe 4 of the axial pressure manual pressurizing device is communicated with the hydraulic cavity 306 of the self-gravity pressurizing device, and the second hydraulic connecting pipe 7 of the confining pressure manual pressurizing device is well connected with the confining pressure hole 1015 of the ultrafiltration tester;
11) and injecting the prepared test solution into a liquid storage tank of the axial pressure manual pressurizing device, and injecting tap water into the liquid storage tank of the confining pressure manual pressurizing device to finish the test preparation.
3. And (3) testing:
1) closing the liquid inlet channel 108 of the ultrafiltration tester and the second water stop valve 10 at the confining pressure hole, and respectively applying appropriate pressure to the axial pressure manual pressurizing device and the confining pressure manual pressurizing device;
2) first, slowly opening the second water stop valve 10 at the confining pressure hole 1015, observing the change condition of the confining pressure gauge 1016 at the confining pressure hole, simultaneously slowly opening the liquid inlet channel 108, observing the change condition of the axle pressure gauge 109 at the liquid inlet channel, adjusting the axle pressure and the confining pressure, and ensuring that the reading of the axle pressure gauge 109 at the liquid inlet channel is not more than that of the confining pressure gauge 1016 at the confining pressure hole. When the readings of the shaft pressure gauge and the confining pressure gauge are basically stable, reading the pressure value and recording the time;
3) connecting each side sampling port 1017 and bottom sampling port 1012 with rubber hose, introducing into wide-mouth liquid storage bottle to collect exudate, sampling when the exudate of infusion bottle reaches 20ml, and numbering Yi-j(wherein i ═ 1, 2, 3, 4, which represent three side sampling ports 1017 and bottom sampling ports 1012, respectively, from top to bottom; j ═ 1, 2, 3 ·, which represents the order in which the samples were taken).
4) And performing water chemistry analysis on the prepared test solution and the obtained exudate water sample, and drawing a exudate water quality change curve.
The technical contents not mentioned in the above modes can be realized by adopting or referring to the prior art.
It is intended that all equivalents and obvious modifications made by those skilled in the art in light of the teachings of this specification be within the scope of the invention.

Claims (4)

1. The utility model provides an undisturbed clay ultrafiltration test device which characterized in that: comprises an ultrafiltration tester, a manual pressurizing device and a self-gravity pressurizing device; the ultrafiltration tester comprises an outer top cover, an outer base and a side wall connecting the outer top cover and the outer base, wherein the outer top cover, the outer base and the side wall are enclosed to form an enclosed cavity, an inner top cover, an inner base, a flexible silica gel sleeve for coating a undisturbed soil sample and a perforated sleeve are arranged in the enclosed cavity, the inner top cover is arranged below the outer top cover, a communicated liquid inlet channel is arranged in the inner top cover and the outer top cover, the liquid inlet channel is externally connected with an axial pressure gauge, the inner base is arranged above the outer base, a water outlet channel is arranged in the inner base, a water storage cavity communicated with the water outlet channel and a bottom sampling port for communicating the water storage cavity with the outside are arranged in the outer base, the inner top cover, the inner base and the flexible silica gel sleeve are enclosed to form an undisturbed soil sample permeation cavity, the perforated sleeve is sleeved outside the flexible silica gel sleeve, an confining pressure cavity is formed between the perforated sleeve and the flexible silica gel sleeve, and confining, the confining pressure hole is externally connected with a confining pressure gauge, a lateral sampling port is arranged at the corresponding position of the side wall, the perforated sleeve and the flexible silica gel sleeve, a solenoid is arranged at the lateral sampling port, threaded interfaces matched with the solenoid are arranged on the side wall and the flexible silica gel sleeve, and a flexible filter screen is arranged at the position of the flexible silica gel sleeve corresponding to the lateral sampling port; the manual pressurizing device comprises a liquid storage tank, a water pressing well structure for manually pressing out liquid stored in the liquid storage tank is arranged on the liquid storage tank, and a liquid injection port is arranged above one end of the liquid storage tank; the self-gravity pressurizing device comprises a base, a top plate and a bearing plate, wherein a supporting column is arranged between the base and the top plate, the bearing plate is sleeved on the supporting column and can move up and down along the supporting column, a pressure distribution plate is arranged on the bearing plate, a hydraulic cavity is arranged on the base, a pressure guide column is arranged in the hydraulic cavity and is connected with the bearing plate; a liquid outlet of the pressurized water well structure is communicated with a hydraulic cavity through a hydraulic connecting pipe, the hydraulic cavity is communicated with a liquid inlet channel or a confining pressure hole through a pressure stabilizing output pipe, and the hydraulic connecting pipe and the pressure stabilizing output pipe are both provided with one-way valves; the device comprises a manual pressurizing device, a self-gravity pressurizing device, a liquid outlet of the manual pressurizing device, a liquid inlet channel, a liquid outlet channel, a liquid stabilizing output tube, a confining pressure hole and a liquid outlet, wherein the manual pressurizing device is provided with two manual pressurizing devices, namely an axial pressure manual pressurizing device and a confining pressure manual pressurizing device;
the bottom surface of the inner top cover is provided with a first groove, a first water filtering plate is placed in the first groove, the top surface of the inner base is provided with a second groove, a second water filtering plate is placed in the second groove, a top inner cavity is arranged between the water inlet channel and the first water filtering plate, and a bottom inner cavity is arranged between the water outlet channel and the second water filtering plate; and a steel gauze is arranged between the water filtering plate and the upper and lower contact surfaces of the undisturbed soil sample.
2. The undisturbed clay ultrafiltration test apparatus of claim 1, wherein: the side direction sample connection sets up 2 ~ 5, and is interval arrangement from top to bottom along the lateral wall.
3. The undisturbed clay ultrafiltration test apparatus of claim 1, wherein: the pressurized-water well structure comprises a well body and a pressurized handle, wherein the well body is of a hollow cylindrical structure, the bottom of the well body is communicated with the lower part of the liquid storage tank through a liquid inlet pipe, a liquid outlet is formed in the upper part of the well body, a piston is arranged in the well body, and the piston is connected with the pressurized handle which drives the piston to reciprocate.
4. The undisturbed clay ultrafiltration test apparatus of claim 1, wherein: the ultrafiltration tester is provided with a plurality of ultrafiltration testers, a tee joint is connected to the liquid inlet channel and the confining pressure hole of each ultrafiltration tester, the tee joints at the liquid inlet channels of all the ultrafiltration testers are communicated with each other, and the tee joints at the confining pressure holes of all the ultrafiltration testers are also communicated with each other.
CN201610652799.1A 2016-08-10 2016-08-10 Ultrafiltration test device for undisturbed clay Active CN106153520B (en)

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