CN111795917A - Dynamic slurry permeability test device and method - Google Patents
Dynamic slurry permeability test device and method Download PDFInfo
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- CN111795917A CN111795917A CN202010815869.7A CN202010815869A CN111795917A CN 111795917 A CN111795917 A CN 111795917A CN 202010815869 A CN202010815869 A CN 202010815869A CN 111795917 A CN111795917 A CN 111795917A
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- 239000002002 slurry Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000035699 permeability Effects 0.000 title claims abstract description 25
- 238000012360 testing method Methods 0.000 title claims abstract description 25
- 239000002689 soil Substances 0.000 claims abstract description 107
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 230000005540 biological transmission Effects 0.000 claims abstract description 47
- 239000011148 porous material Substances 0.000 claims abstract description 30
- 230000008569 process Effects 0.000 claims abstract description 24
- 238000009412 basement excavation Methods 0.000 claims abstract description 23
- 230000000694 effects Effects 0.000 claims abstract description 11
- 230000008595 infiltration Effects 0.000 claims abstract description 6
- 238000001764 infiltration Methods 0.000 claims abstract description 6
- 230000005641 tunneling Effects 0.000 claims abstract description 3
- 230000001360 synchronised effect Effects 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 17
- 230000035515 penetration Effects 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 7
- 238000011156 evaluation Methods 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 6
- 238000010998 test method Methods 0.000 claims description 4
- 238000005056 compaction Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000011161 development Methods 0.000 claims 1
- 230000018109 developmental process Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 8
- 230000008859 change Effects 0.000 abstract description 3
- 238000004088 simulation Methods 0.000 abstract 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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Abstract
A dynamic slurry permeability test device and method comprises: a permeation system, a cutting system, and a pressurization system; the infiltration system comprises a soil sample cylinder, a slurry cylinder A, a slurry cylinder B and a water storage tank and is used for performing slurry infiltration and measuring the pore pressure and the water infiltration amount in the test process in real time; the cutting system comprises a power unit, a transmission shaft and a cutter head and is used for driving the cutter head to rotate and advance so as to cut a soil sample; the pressurization system comprises an air storage tank and a pressure controller and is used for controlling the mud pressure of the soil sample cylinder. The device can be used for carrying out a mud dynamic permeation simulation test under the condition that the cutter head continuously cuts the soil body of the excavation surface in the shield tunneling process, measuring the dynamic change process of the pore water pressure and the stratum water seepage quantity of the soil body, further evaluating the permeation performance of the mud and the transmission effect of the mud pressure on the excavation surface, and obtaining an effective conclusion so as to guide the actual mud-water shield construction project.
Description
Technical Field
The invention relates to the technical field of slurry shield tunnel construction, in particular to a dynamic slurry permeability test device and method suitable for a slurry stabilized tunnel excavation surface.
Background
In recent years, slurry shields are widely applied in the fields of urban rail transit, highway tunnels, water delivery tunnels and the like. The slurry shield tunnel is mostly positioned below the underground water level, the stability of the excavation surface is maintained by applying slurry pressure slightly higher than the water-soil pressure of the excavation surface, solid-phase particles gradually block stratum pores in the slurry permeation process, a slurry film with lower water permeability is further formed, and the pressure difference between the slurry and the water-soil of the excavation surface is maintained. One part of the pressure difference of the slurry is transmitted to the soil body of the excavation surface through a mud film so as to improve the effective stress of the soil body; the other part is transferred to water in the stratum, and the excess pore water pressure is generated in the soil body, but the excess pore water pressure can lower the stability of the soil body of the excavation surface. Therefore, the permeability of the slurry to the stratum and the transmission effect of the slurry pressure directly influence the stability of the excavation surface.
At present, the slurry shield construction mainly responds to different stratum conditions by adjusting characteristic parameters such as specific gravity, viscosity, filtration loss and the like of slurry, the problem of the transmission effect of slurry pressure on an excavation surface is not considered, and the selection of the characteristic parameters of the slurry is usually dependent on the existing construction experience, so that the effect is not ideal in the field application process. The research on the mud permeability rule is generally carried out by adopting a static mud permeability test device in China, different stratum conditions are met by measuring characteristic parameters such as the specific gravity, the viscosity, the filtration loss, the mud film thickness and the like of mud, the periodical damage and reconstruction of the mud permeation and the mud film forming process caused by cutting of a cutter on the soil body of the excavation surface in the excavation process are not considered, the transfer rule of the mud pressure difference on the excavation surface is not measured and evaluated, the research method on the mud performance is over simplified, and the evaluation index on the mud performance is not comprehensive enough.
Therefore, how to simulate the mud permeation process in the excavation process in the actual construction process and obtain the permeability of the mud pressure to different strata and the transmission effect of the mud pressure on the excavation surface is a great problem which needs to be solved by the technical personnel in the field.
Disclosure of Invention
The technical problem is as follows: the invention aims to overcome the defects in the prior art and provides the dynamic mud permeability test device and the dynamic mud permeability test method which are simple in structure, convenient to operate and capable of obtaining different stratums.
The technical scheme is as follows: the invention discloses a dynamic slurry permeability test device, which comprises a permeability system, a cutting system and a pressurizing system, wherein the permeability system comprises a pressure chamber and a pressure chamber;
the infiltration system comprises a soil sample cylinder, a slurry cylinder A, a slurry cylinder B and a water storage tank; the soil sample cylinder comprises a cylinder body, a front end transparent cover and a rear end transparent cover which are arranged on two sides of the cylinder body, a soil sample column with a water permeable partition plate is sequentially arranged at the front part in the cylinder body, a plurality of sensor interfaces communicated with the interior of the cylinder body are arranged on the outer wall of the cylinder body at intervals, each sensor interface is provided with a pore pressure sensor connected with a computer, and the upper computer is used for recording and displaying the information of the pore pressure sensors; the front end transparent cover is also provided with a pore pressure sensor connected with the upper computer, the through hole of the front end transparent cover is connected with a water storage tank through a drain pipe, and the water storage tank is communicated with the atmosphere; the mud cylinder B is connected to the inlet of the outer wall at the rear part of the cylinder body through a mud pipe B, and the mud cylinder A is communicated with the rear end transparent cover through a mud pipe a and a sealing joint;
the cutting system comprises a power unit, a transmission shaft connected to the power unit and a cutter head connected with the transmission shaft and positioned in the soil sample cylinder, and the center of the cutter head is provided with a slurry inlet hole for the transmission shaft to penetrate through; the power unit is arranged on a guide rail capable of moving back and forth, the transmission shaft is a hollow rod, and the axis of the transmission shaft is superposed with the axis of the soil sample cylinder;
the pressurization system comprises an air storage tank and a pressure controller for controlling the air storage tank; the gas storage tank is respectively communicated with the A mud cylinder and the B mud cylinder through gas pipes, and the gas pressure is controlled by the pressure controller to be input into the A mud cylinder and the B mud cylinder.
The soil sample barrel is made of transparent organic glass, and a graduated scale which is convenient for observing the position of the cutterhead and the position of the excavation face is arranged on the outer wall of the barrel.
An electronic scale connected with a computer and used for measuring the seepage water volume in real time is arranged below the water storage tank.
The cutter head comprises a plurality of spokes with right-angle trapezoid cross sections, and each spoke is provided with a plurality of cuboid metal blocks for cutting soil samples.
The circumference surface of the front end transparent cover and the circumference surface of the rear end transparent cover contacted with the inner wall of the cylinder body are provided with semicircular grooves, and sealing rubber rings are arranged in the grooves.
And the mud pipe a is provided with a switch valve a, the mud pipe b is provided with a switch valve b, and the drain pipe is provided with a switch valve c.
The outer diameter of the cutter head is slightly smaller than the inner diameter of the soil sample cylinder body.
The power unit comprises a first synchronous motor and a second synchronous motor which are installed on the guide rail, the first synchronous motor is used for driving the power unit to move along the guide rail, and the second synchronous motor is used for driving the cutter head to rotate.
And a sealing ring matched with the transmission shaft is arranged at the through hole of the rear end through cover.
A test method for measuring the dynamic slurry permeability by using the device comprises the following steps:
step S1: placing a water-permeable partition plate and a soil sample column in the soil sample cylinder in sequence, and carrying out water saturation and compaction treatment on the soil sample column;
step S2: firstly, installing a cutter disc and a transmission shaft in a cutting system in a soil sample cylinder, keeping the interval between the cutter disc and the surface of a soil sample column in the soil sample cylinder at 1-2 cm, then installing a rear-end transparent cover at the rear end of the soil sample cylinder in a sealing manner, then opening a switch valve B, and enabling slurry in a slurry cylinder B to enter a space between the surface of the soil sample column and the rear-end transparent cover until the space is filled;
step S3: fixing the horizontally placed soil sample cylinder, and fixing the transmission shaft on the power unit through a sealing joint;
step S4: setting the gas pressure in the A mud cylinder and the B mud cylinder, and adjusting the gas pressure in the A mud cylinder and the B mud cylinder through a pressure controller to keep the mud pressure in the soil sample cylinder stable in the whole test process; connecting the mud pipe a of the mud cylinder A with a transmission shaft, and simultaneously opening a switch valve a and a switch valve on a drain pipe to pressurize the soil sample column in the soil sample cylinder;
step S5: after the soil sample column is pressurized for 15min, starting a second synchronous motor to enable the cutting system to move towards the soil sample cylinder at a constant speed along the guide rail, wherein the moving speed is adjusted at will between 0 and 60mm/min, and simultaneously starting a first synchronous motor to enable a cutter disc on a transmission shaft to rotate at a fixed rotating speed to cut the soil sample column, wherein the rotating speed is adjusted at will between 0 and 5 r/min;
step S6: recording an output signal of the pore pressure sensor and data measured by the electronic scale through a computer, observing a graduated scale on the outer wall of the soil sample cylinder body, and stopping the power unit when the cutter head is tunneled to a position 5cm away from the front transparent cover;
step S7: and calculating the difference between the mud pressure measured by the pore pressure sensor and the pore water pressure in the soil sample column in the tunneling process as an evaluation index for evaluating the mud pressure transmission effect.
Has the advantages that: due to the adoption of the technical scheme, the method can effectively measure the pore water pressure of the soil body on the excavation surface and the stratum water seepage amount in the dynamic slurry permeation process, further evaluate the permeability of the slurry to the stratum and the transmission effect of the slurry pressure on the excavation surface, and provide safety guarantee for guiding the stability of the actual slurry shield construction excavation surface. The experimental device pressurizes the slurry in the osmotic system through the pressurization system, the slurry pressure acts on the soil sample column, the power unit is started to drive the cutter head to rotate to cut the soil sample column, moisture seeps out of the soil sample column in the slurry osmosis process and flows into the water storage tank through the drain pipe, the pore water pressure of different positions of the soil sample column is measured through the pore pressure sensor, the mass of liquid seeped out of the soil sample column is measured through the electronic scale, and the change rule of the pore water pressure in the soil sample column and the change rule of the seepage water quantity of the soil sample column under the set pressure are obtained. Accords with the mud dynamic permeability process among the actual work progress, can obtain more true, more accurate reliable transmission effect and the mud dynamic permeability of mud pressure, main advantage down compared with prior art is as follows:
the device has the advantages that the cutter head cutting mechanism is provided, dynamic slurry penetration tests are carried out through the device, the principle is simple, the function is clear, the penetration process of slurry to different stratums in the process of cutting soil bodies by the cutter head can be simulated, the actual construction process is met, the pore water pressure and the stratum water seepage quantity of the soil bodies on the excavation surface in the dynamic slurry penetration process can be effectively measured, the penetration performance of the slurry to the stratum and the transmission effect of the slurry pressure on the excavation surface are further evaluated, and an effective conclusion is obtained so as to guide the actual slurry shield construction project.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2(a) is a schematic view of the cutter head structure of the present invention.
FIG. 2(b) is a sectional view taken along line A-A in FIG. 2 (a).
Fig. 3 is a schematic view showing the connection between the components of the present invention.
In the figure: 1-soil sample cylinder, 2-slurry, 3-soil sample column, 4-sensor interface, 5-water permeable clapboard, 6-front permeable cover, 7-drain pipe, 8-c switch valve, 9-pore pressure sensor, 10-rear permeable cover, 11-power unit, 12-sealing joint, 13-guide rail, 14-transmission shaft, 15-cutter head, 16-rectangular metal block, 17-A slurry cylinder, 18-a slurry pipe, 19-a switch valve, 20-gas storage tank, 21-pressure controller, 22-gas pipe, 23-B slurry cylinder, 24-B slurry pipe, 25-B switch valve, 26-electronic scale, 27-water storage tank, 28-cable, 29-computer, 30-first synchronous motor, 31-second synchronous motor, 32-pulp inlet hole, 32-spoke.
Detailed Description
The invention will be further described with reference to examples in the drawings to which:
as shown in FIG. 1, the dynamic slurry permeability test device of the invention mainly comprises a permeability system, a cutting system and a pressurizing system;
the infiltration system comprises a soil sample cylinder 1, an A mud cylinder 17, a B mud cylinder 23 and a water storage tank 27; the soil sample cylinder 1 comprises a cylinder body, a front end transparent cover 6 and a rear end transparent cover 10 which are arranged on two sides of the cylinder body, wherein the centers of the front end transparent cover 6 and the rear end transparent cover 10 are both provided with a through hole, the front part in the cylinder body is sequentially provided with a soil sample column 3 of a water permeable partition plate 5, the outer wall of the cylinder body is provided with a plurality of sensor interfaces 4 communicated with the inside of the cylinder body at intervals, each sensor interface 4 is provided with a pore pressure sensor 9 connected with a computer 29, and the information of the pore pressure sensor 9 is recorded and displayed by an upper computer; the front end transparent cover 6 is also provided with a pore pressure sensor 9 connected with an upper computer, the through hole of the front end transparent cover 6 is connected with a water storage tank 27 through a drain pipe 7, an electronic scale 26 connected with a computer and used for measuring the seepage water quantity in real time is arranged below the water storage tank 27, and the electronic scale 26 is used for measuring the liquid mass discharged into the water storage tank 27 by the soil sample cylinder 1 in real time. The water storage tank 27 is communicated with the atmosphere and is placed on the electronic scale 26 so as to measure the water seepage amount in real time; the mud cylinder B23 is connected to the inlet of the outer wall at the rear part of the cylinder body through a mud pipe B24, and the mud cylinder A17 is communicated with the rear end transparent cover 10 through a mud pipe a 18 and a sealing joint 12; the rear end transparent cover 10 is provided with a sealing ring at the through hole for matching with the transmission shaft 14, and the sealing joint 12 is used for connecting the mud pipe 18 and the transmission shaft 14. The mud pipe 18 a is provided with a switch valve 19 a, the mud pipe 24 b is provided with a switch valve 25 b, and the drain pipe 7 is provided with a switch valve 8 c. The barrel of soil sample section of thick bamboo 1 make by transparent organic glass, be equipped with the scale of just observing blade disc position and excavation face position on the outer wall of barrel. The front end transparent cover 6 and the rear end transparent cover 10 are provided with semicircular grooves on the circumferential surface contacted with the inner wall of the cylinder body, and sealing rubber rings are arranged in the grooves.
The cutting system includes power pack 11, connects transmission shaft 14 on power pack 11 and links to each other the blade disc 15 that is located soil sample section of thick bamboo 1 with transmission shaft 14, the external diameter of blade disc 15 slightly be less than the internal diameter of soil sample section of thick bamboo barrel. The center of the cutter head 15 is provided with a pulp inlet hole 32 for the transmission shaft 14 to pass through; the power unit 11 is arranged on a guide rail 13 capable of moving back and forth, the transmission shaft 14 is a hollow rod, and the axis of the transmission shaft 14 is superposed with the axis of the soil sample cylinder 1; the mud in the mud barrel 17 is injected in front of the cutter head 15 in the soil sample barrel 1 through the transmission shaft 14. The transmission shaft 14 is arranged in the central opening of the end cover 10 and is in sealed connection with the end cover 10, and the transmission shaft 14 can move along the axis of the end cover 10. A cutter head 15 is arranged at one end of the transmission shaft 14, and the outer diameter of the cutter head 15 is slightly smaller than the inner diameter of the soil sample cylinder 1; a plurality of metal blocks 16 are mounted on the cutter head 15, and the metal blocks 16 are cuboid and used for cutting the soil sample column 3. The power unit 11 comprises a first synchronous motor 30 and a second synchronous motor 31 which are installed on the guide rail 13, the first synchronous motor 30 is used for driving the power unit 11 to move along the guide rail, and the second synchronous motor 31 is used for driving the cutter head to rotate to cut the soil sample column 3. The cutter head 15 comprises a plurality of spokes 33 with right trapezoid cross sections, as shown in fig. 2(a) (b), the number of the spokes 33 in the example is 6, the included angle between the central axes of two adjacent spokes is 60 degrees, which can be selected according to experimental conditions, and each spoke is provided with a plurality of cuboid metal blocks 16 for cutting soil samples. During the rotation of the cutter head 15, soil cut by the rectangular metal block 16 is discharged to the rear of the cutter head through the inclined surface of the spoke 33.
The pressurization system comprises an air storage tank 20 and a pressure controller 21 for controlling the air storage tank 20, wherein the pressure controller 21 is arranged on the air storage tank 20; the air storage tank 20 is respectively communicated with the A mud cylinder 17 and the B mud cylinder 23 through air pipes 22, and the air storage tank is controlled by the pressure controller 21 to input air pressure into the A mud cylinder 17 and the B mud cylinder 23 in the test process. The mud is filled in the mud cylinder A17 and the mud cylinder B23, and the upper part of the mud cylinder A is connected with an air inlet communicated with an air storage tank 20.
Fig. 3 is a schematic diagram showing the connection relationship between the components of the present invention, wherein a plurality of sensors on the soil sample cylinder 1 and an electronic scale 27 arranged under a water storage tank 26 are connected with a computer 29 through cables 28, and the soil sample cylinder 1 is connected with a pressure controller 21 connected with a gas storage tank 20 through gas pipes 22 respectively. The computer 29 is used for recording and displaying the measurement results of the pore pressure sensor 9 and the electronic scale 26.
The invention discloses a test method for measuring dynamic slurry permeability, which comprises the following steps:
step S1: placing a water-permeable partition plate 5 and a soil sample column 3 in the soil sample cylinder 1 in sequence, and carrying out water saturation and compaction treatment on the soil sample column 3;
step S2: firstly, installing a cutter head 15 and a transmission shaft 14 in a cutting system in a soil sample cylinder 1, keeping the interval between the cutter head 15 and the surface of a soil sample column 3 in the soil sample cylinder 1 to be 1-2 cm, then, installing a rear-end transparent cover 10 at the rear end of the soil sample cylinder 1 in a sealing manner, then, opening a switch valve 25B, and enabling slurry in a slurry cylinder 23B to enter a space between the surface of the soil sample column 3 and the rear-end transparent cover 10 until the slurry is filled;
step S3: fixing the horizontally placed soil sample cylinder 1, and fixing a transmission shaft 14 on a power unit 11 through a sealing joint 12;
step S4: setting the gas pressure in the A mud cylinder 17 and the mud cylinder 23 to be 0-1 MPa, and adjusting the gas pressure in the A mud cylinder 17 through a pressure controller 21 to keep the mud pressure in the soil sample cylinder 1 stable in the whole test process; connecting a mud pipe 18 of a mud cylinder 17A with a transmission shaft 14, and simultaneously opening a switch valve 19 and a switch valve on a drain pipe 7 to pressurize the soil sample column 3 in the soil sample cylinder 1;
step S5: after the soil sample column is pressurized for 15min, the second synchronous motor 31 is started, the cutting system moves towards the soil sample cylinder 1 at a constant speed along the guide rail 13, the moving speed is randomly adjusted within the range of 0-60 mm/min, and meanwhile, the first synchronous motor 30 is started, so that the cutter head 15 on the transmission shaft 14 rotates to cut the soil sample column 3 at a fixed rotating speed, and the rotating speed is randomly adjusted within the range of 0-5 r/min;
step S6: recording the output signal of the pore pressure sensor 9 and the data measured by the electronic scale 26 through a computer, observing a graduated scale on the outer wall of the soil sample cylinder body, and stopping the operation of the power unit 11 when the cutter head 15 is tunneled to 5cm away from the front transparent cover (6);
step S7: the variation of the water displacement in unit time measured by the electronic scale 26 is used as an evaluation index of the permeability of the slurry 2, and the difference between the pressure of the slurry 2 measured by the pore pressure sensor 9 and the pore water pressure in the soil sample column 3 in the test process is calculated and used as an evaluation index for evaluating the slurry pressure transmission effect.
Claims (10)
1. The utility model provides a developments mud permeability test device which characterized in that: the device comprises a permeation system, a cutting system and a pressurizing system;
the infiltration system comprises a soil sample cylinder (1), an A mud cylinder (17), a B mud cylinder (23) and a water storage tank (27); the soil sample cylinder (1) comprises a cylinder body, a front end transparent cover (6) and a rear end transparent cover (10) which are arranged on two sides of the cylinder body, a soil sample column (3) of a water permeable partition plate (5) is sequentially arranged at the front part in the cylinder body, a plurality of sensor interfaces (4) communicated with the inside of the cylinder body are arranged on the outer wall of the cylinder body at intervals, a pore pressure sensor (9) connected with a computer is arranged on each sensor interface (4), and information of the pore pressure sensor (9) is recorded and displayed through an upper computer; a pore pressure sensor (9) connected with an upper computer is also arranged on the front transparent cover (6), a through hole of the front transparent cover (6) is connected with a water storage tank (27) through a drain pipe (7), and the water storage tank (27) is communicated with the atmosphere; the mud cylinder B (23) is connected to an inlet of the outer wall at the rear part of the cylinder body through a mud pipe B (24), and the mud cylinder A (17) is communicated with the rear end transparent cover (10) through a mud pipe a (18) and a sealing joint (12);
the cutting system comprises a power unit (11), a transmission shaft (14) connected to the power unit (11) and a cutter head (15) connected with the transmission shaft (14) and positioned in the soil sample cylinder (1), wherein a slurry inlet hole (32) for the transmission shaft (14) to penetrate through is formed in the center of the cutter head (15); the power unit (11) is arranged on a guide rail (13) capable of moving back and forth, the transmission shaft (14) is a hollow rod, and the axis of the transmission shaft (14) is superposed with the axis of the soil sample cylinder (1);
the pressurization system comprises an air storage tank (20) and a pressure controller (21) for controlling the air storage tank (20); the gas storage tank (20) is respectively communicated with the A mud cylinder (17) and the B mud cylinder (23) through gas transmission pipes, and the gas storage tank is controlled by the pressure controller (21) to input gas pressure into the mud cylinder (17) and the B mud cylinder (23).
2. The dynamic mud penetration test apparatus of claim 1, wherein: the soil sample barrel (1) is made of transparent organic glass, and a graduated scale which is convenient for observing the position of the cutter head and the position of the excavation surface is arranged on the outer wall of the barrel.
3. The dynamic mud penetration test apparatus of claim 1, wherein: an electronic scale (26) which is connected with a computer and measures the seepage water volume in real time is arranged below the water storage tank (27).
4. The dynamic mud penetration test apparatus of claim 1, wherein: blade disc (15) constitute for spoke (33) of right trapezoid structure by a plurality of cross sections, all install a plurality of cuboid metal blocks (16) that are used for cutting soil sample on every spoke.
5. The dynamic mud penetration test apparatus of claim 1, wherein: the circumference surface of the front end transparent cover (6) and the rear end transparent cover (10) which are contacted with the inner wall of the cylinder body is provided with a semicircular groove, and a sealing rubber ring is arranged in the groove.
6. The dynamic mud penetration test apparatus of claim 1, wherein: the mud pipe (18) of a is provided with a switch valve (19) of a, the mud pipe (24) of b is provided with a switch valve (25) of b, and the drain pipe (7) is provided with a switch valve (8) of c.
7. The dynamic mud penetration test apparatus of claim 1, wherein: the outer diameter of the cutter head (15) is slightly smaller than the inner diameter of the soil sample cylinder body.
8. The dynamic mud penetration test apparatus of claim 1, wherein: power unit (11) including installing first synchronous machine (30) and second synchronous machine (31) on guide rail (13), first synchronous machine (30) are used for driving power unit (11) and move along the guide rail, second synchronous machine (31) are used for driving the blade disc rotation.
9. The dynamic mud penetration test apparatus of claim 1, wherein: and a sealing ring matched with the transmission shaft (14) is arranged at a through hole of the rear end transparent cover (10).
10. A test method for measuring dynamic mud permeability using the apparatus of any of claims 1-8, comprising the steps of:
step S1: a water permeable partition plate (5) and a soil sample column (3) are sequentially placed in the soil sample cylinder (1), and water saturation and compaction treatment are carried out on the soil sample column (3);
step S2: firstly, installing a cutter head (15) and a transmission shaft (14) in a cutting system in a soil sample cylinder (1), keeping the interval between the cutter head (15) and the surface of a soil sample column (3) in the soil sample cylinder (1) to be 1-2 cm, then installing a rear-end transparent cover (10) at the rear end of the soil sample cylinder (1) in a sealing manner, then opening a switch valve (25) B, and enabling slurry in a slurry cylinder (23) B to enter a space between the surface of the soil sample column (3) and the rear-end transparent cover (10) until the slurry is filled;
step S3: fixing the horizontally placed soil sample cylinder (1), and fixing a transmission shaft (14) on a power unit (11) through a sealing joint (12);
step S4: setting gas pressure in the A mud cylinder (17) and the B mud cylinder (23), and adjusting the gas pressure in the A mud cylinder (17) and the B mud cylinder (23) through a pressure controller (21) to keep the mud pressure in the soil sample cylinder (1) stable in the whole test process; connecting a mud pipe (18) a of a mud cylinder (17) A with a transmission shaft (14), simultaneously opening a switch valve (19) a and a switch valve on a drain pipe (7), and pressurizing a soil sample column (3) in the soil sample cylinder (1);
step S5: after the soil sample column is pressurized for 15min, a second synchronous motor (31) is started, a cutting system moves towards the soil sample cylinder (1) at a constant speed along a guide rail (13), the moving speed is randomly adjusted within 0-60 mm/min, and meanwhile, a first synchronous motor (30) is started, a cutter head (15) on a transmission shaft (14) rotates to cut the soil sample column (3) at a fixed rotating speed, and the rotating speed is randomly adjusted within 0-5 r/min;
step S6: recording an output signal of the pore pressure sensor (9) and data measured by the electronic scale (26) through a computer, observing a graduated scale on the outer wall of the soil sample cylinder body, and stopping the power unit (11) when the cutter head (15) is tunneled to a position 5cm away from the front transparent cover (6);
step S7: the variation of the water displacement in unit time measured by the electronic calculating scale (26) is used as an evaluation index of the permeability of the slurry (2), and the difference between the pressure of the slurry (2) measured by the pore pressure sensor (9) and the pore water pressure in the soil sample column (3) in the tunneling process is calculated and used as an evaluation index for evaluating the slurry pressure transmission effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010815869.7A CN111795917A (en) | 2020-08-14 | 2020-08-14 | Dynamic slurry permeability test device and method |
Applications Claiming Priority (1)
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| CN113188970A (en) * | 2021-03-31 | 2021-07-30 | 山东大学 | Variable cross-section test device and method for simulating slurry penetration film formation of slurry shield |
| CN113959924A (en) * | 2021-10-27 | 2022-01-21 | 中铁二十局集团第一工程有限公司 | Slurry horizontal permeability test device and method considering overburden load on stratum |
| CN116297105A (en) * | 2023-03-30 | 2023-06-23 | 浙江大学 | Device and method for simulating three-dimensional dynamic slurry permeation test under supergravity |
| CN116793917A (en) * | 2023-03-09 | 2023-09-22 | 山东交通学院 | Slurry balance shield slurry penetration test device and method |
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