CN109060526A - Thief zone sand-pebble layer earth pressure balanced shield, EPBS consolidates permeability experimental facility and method - Google Patents
Thief zone sand-pebble layer earth pressure balanced shield, EPBS consolidates permeability experimental facility and method Download PDFInfo
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- CN109060526A CN109060526A CN201810728471.2A CN201810728471A CN109060526A CN 109060526 A CN109060526 A CN 109060526A CN 201810728471 A CN201810728471 A CN 201810728471A CN 109060526 A CN109060526 A CN 109060526A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/023—Pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
Abstract
A kind of Thief zone sand-pebble layer earth pressure balanced shield, EPBS consolidation permeability experimental facility, which includes four part of subject and compression system；Its process for simulating the consolidation infiltration when promoting of the shield machine face front end soil body, sandy gravel after the sandy gravel that do not improve, mud and improvement is successively successively placed from cylinder body bottom toward top, constant head permeability test is carried out in the state of being not pressurized and lateral confinement under pressurised conditions consolidates permeability test, can also test the critical pressure for puncturing soil sample by adjusting water pump hydraulic pressure.
Description
Technical field
The invention belongs to geotechnical testament apparatus technical field, specifically a kind of Thief zone sand-pebble layer earth pressure balance
Shield consolidates permeability experimental facility.
Background technique
Sand-pebble layer under hydraulic pressure higher strip part carries out earth pressure balanced shield, EPBS construction will appear serious excavation often
Screw conveyor in sweat problem and shield machine is gushed problem, since the native gravel partial size in sand-pebble layer is larger, sand ovum
Gap is larger between stone, therefore causes the infiltration coefficient on this stratum larger, when water pressure is larger, need to add additive into
Row sediment improvement guarantees that excavation face is stable and screw conveyor is not gushed to reduce its infiltration coefficient, but due to sand
The partial size of cobble is larger, and shield tunneling process is similar to one to the consolidation process of osmosis under the soil body pressurized state of front,
General permeameter can not only be fitted into the biggish sandy gravel of partial size but also can not consider consolidation factor and very heavy in permeability test
Pressurization factor is pushed up, if desired knows the soil improvement effect of Thief zone sand-pebble layer earth pressure balanced shield, EPBS under high hydraulic condition such as
What, it is necessary to permeability apparatus and test method are improved and innovated.
Summary of the invention
Goal of the invention:
The present invention provides a kind of Thief zone sand-pebble layer earth pressure balanced shield, EPBS consolidation permeability experimental facility and method, the purpose is to
It solves the problems of previous.The device can be packed into the biggish sandy gravel soil body of partial size, and be pressurizeed using jack
Make soil solidifying, test the infiltration coefficient of soil sample during this, moreover it is possible to is breakdown by adjusting water pump water pressure test soil sample
Critical pressure.
Technical solution:
A kind of Thief zone sand-pebble layer earth pressure balanced shield, EPBS consolidation permeability experimental facility, it is characterised in that: the device includes real
Test four part of main body and compression system；
Subject include test cylinder (1), the whippletree (4) at the top of test cylinder, upper permeable iron plate (10) and under permeable iron plate
(13)；Whippletree (4) is fixed at the top of test cylinder (1), upper permeable iron plate (10) and under permeable iron plate (13) setting exist
In test cylinder (1), under permeable iron plate (13) setting be arranged in the bottom of test cylinder (1), upper permeable iron plate (10) lower
Above water iron plate (13), upper permeable iron plate (10) and under form the space for accommodating and testing the soil body (2) between permeable iron plate (13)；
It is respectively arranged with the first outlet valve (15), the second outlet valve from top to bottom in the side wall of test cylinder (1)
(17), third outlet valve (19) and cylinder bottommost water inlet valve (21)；
Displacement meter (8) are fixed with by electromagnet (7) in the top of test cylinder (1), the end of probe of displacement meter 8 is placed on permeable
At the top of iron plate (10)；
Compression system is arranged between upper permeable iron plate (10) and the whippletree (4) at top, for the reality below upper permeable iron plate (10)
Test the soil body (2) pressurization.
The inner wall of test cylinder (1) is provided with graduated scale (9).
Compression system is jack (6), and the upper end of jack (6) connects whippletree (4), fixes the upper end；Jack (6)
Lower end contact permeable iron plate (10)；
Load transducer (14) are provided between jack (6) and upper permeable iron plate (10).
Upper permeable iron plate (10) includes barrel mast (25) and is arranged on the chassis (24) with permeable hole of barrel mast (25) bottom,
The bottom of jack (6) is put in barrel mast (25), and chassis (24) withstand the experiment soil body (2) when using, and the end of probe of displacement meter 8 is put
In barrel mast (25) upper end.
Under permeable iron plate (13) include collet (27) and setting collet (27) upper end the permeable supporting plate with permeable hole
(26), collet (27) is contacted with test cylinder (1) bottom, and when use, permeable supporting plate (26) held the experiment soil body (2), cylinder bottommost
Water inlet valve (21) is connected to the space of permeable supporting plate (26) lower part.
Permeable gauze (12) are provided with above permeable supporting plate (26), in use, the experiment soil body (2) is arranged in permeable gauze
(12) on.(permeable gauze effect: 1, mitigates initial water pump flood pressure to the souring of the soil body, bottom soil body is made to become loose；
2, it avoids sand from falling suck-back, is entered in water pump by (21) channel and broken ring is generated to water pump component, shorten water pump service life)
Water delivery rubber hose (16) are connected at first outlet valve (15), and flexible pipe outlet is placed in collecting-tank (24).
The second water pressure sensor is respectively arranged at second outlet valve (17) and third outlet valve (19)
(18) and third water pressure sensor (20).(second and the effect of third water outlet: 1, in experiment need measure two water outlets
Hydraulic pressure force value simultaneously keeps a record；2, it can use it after the end of the experiment to drain step by step from high to low, avoid merely with channel (21)
It drains and hydraulic pressure problems of too occurs.)
Water inlet pressure sensor (22) are provided at water inlet valve (21)；Water inlet valve (21) passes through water delivery rubber tube
(23) water pump (3) are connected to.
The experiment side implemented using above-mentioned Thief zone sand-pebble layer earth pressure balanced shield, EPBS consolidation permeability experimental facility
Method, it is characterised in that: method includes the following steps:
A, by the first outlet valve (15), the second outlet valve (17), third outlet valve (19) and cylinder bottommost into
Mouth of a river valve (21) installs and first valve is allowed to be in close state, and connects cylinder second is connected with third water outlet
The water inlet pressure sensor of two water pressure sensors (18), third water pressure sensor (20) and cylinder body bottom water inlet
(22), water pump (3) are connected with rubber tube in water inlet, it is soft in the water outlet connection water delivery rubber for being located at cylinder topmost
It manages (16), and flexible pipe outlet is placed in collecting-tank (24), permeable iron plate (13) is put into the bottom of test cylinder by under, and spreads
If good permeable gauze (12), then start layering and load the experiment soil body (2), water pump (3) are opened after filling reaches the soil body
Saturation is placed upper permeable iron plate (10) on the soil body, is sequentially placed in the hollow cylinder barrel mast (25) of upper permeable iron plate (10)
Load transducer (14) and jack (6), then by the jack position fixed groove of the top of jack (6) insertion whippletree (4)
(5) in, finally with electromagnet, (7 fix displacement meter (8), and the end of probe of displacement meter (8) is placed on upper permeable iron plate (10) and is pushed up
Portion can open the certain hydraulic pressure of water pump (3) holding after having debugged data collection system, so that more than upper permeable iron plate (10)
When the water surface and water outlet maintain an equal level, the constant head permeability test under being not pressurized；
B, it is pressurizeed using jack (6) to the soil body (2), pressure at this time is measured by the load transducer (14) of its underpart
Value, the soil body (2) generates consolidation phenomenon under a certain pressure value, measures consolidation journey by the displacement data of displacement meter (8) acquisition
Degree opens water pump (3) at this time and keeps certain hydraulic pressure, and the constant head lateral confinement carried out under pressurized state consolidates permeability test；
C, the pressurized state for keeping jack (6), is gradually increased the hydraulic pressure of water pump (3), until the top of upper permeable iron plate (10)
Water layer generates more bubble, records the hydraulic pressure force value of water inlet pressure sensor (22) at this time, this pressure value is that water flow breakdown is real
Test the critical pressure of the soil body.
Advantageous effect:
Thief zone sand-pebble layer earth pressure balanced shield, EPBS consolidates permeability experimental facility and method, the test cylinder and internal junction
Structure mainly include be placed on permeable iron plate and permeable gauze under cylinder body bottom, under the experiment soil body, the soil filled on permeable iron plate
Pressurization whippletree at the top of the upper permeable iron plate that covers above body, cylinder and the jack fixed groove being welded on whippletree, fixation
Four intake-outlets cut in the graduated scale and cylinder inboard wall of cylinder inboard wall and the sealing valve respectively connected.Compression train
System includes the load transducer of the jack and jack lower part that are placed on permeable iron plate.Data collection system includes electricity consumption
The displacement meter that magnet is fixed on cylinder and two water pressure sensors being connect with cylinder intake-outlet.Water circulation system includes
It connects and catchments in the water pressure sensor of cylinder body bottom water inlet, water pump with what cylinder topmost water outlet was connected with rubber hose
Pond, water pump water source is derived from the water in collecting-tank during the test, then finally collects and returns to by cylinder consolidation process of osmosis
In collecting-tank, being carried out continuously for whole process is realized.
It, should using a kind of above-mentioned experimental method of Thief zone sand-pebble layer earth pressure balanced shield, EPBS consolidation permeability experimental facility
Method the following steps are included:
A, the valve of the outlet valve of three water outlets and water inlet is installed and valve is first allowed to be in close state, and
Respective water pressure sensor is connected, goes out in water inlet and connects water pump with rubber tube, in the water outlet for being located at cylinder topmost
Place's connection water delivery rubber hose, and flexible pipe outlet is placed in collecting-tank, permeable iron plate is put into the bottom of test cylinder by under,
And permeable gauze is laid, and then starting layering and loads the experiment soil body, water pump is opened after filling makes the soil body reach saturation,
Upper permeable iron plate is placed on the soil body, is sequentially placed load transducer and jack in the hollow cylinder body of upper permeable iron plate, then
By in the top insertion jack position fixed groove of jack, finally displacement meter is fixed with electromagnet, by displacement meter
End of probe is placed at the top of permeable iron plate, can open the certain hydraulic pressure of water pump holding after having debugged data collection system, so that
When more than upper permeable the iron plate water surface and water outlet maintain an equal level, the constant head permeability test under being not pressurized；
B, it is pressurizeed using the jack pair soil body, pressure value at this time is measured by the load transducer of its underpart, a certain
The soil body generates consolidation phenomenon under pressure value, measures the degree of consolidation by the displacement data of displacement meter acquisition, opens water pump at this time
Certain hydraulic pressure is kept, the constant head lateral confinement carried out under pressurized state consolidates permeability test.
C, the pressurized state for keeping jack, is gradually increased the hydraulic pressure of water pump, until the top aqueous layer of upper permeable iron plate produces
Raw more bubble, records the hydraulic pressure force value of the hydraulic pressure sensor of water inlet at this time, this pressure value is the water flow breakdown test soil body
Critical pressure.
Advantageous effect:
The present invention simulates the process of shield machine face front end soil body consolidation infiltration when promoting, by the sandy gravel that do not improve, mud
Sandy gravel after slurry and improvement is successively successively placed from cylinder body bottom toward top, and constant head infiltration is carried out in the state of being not pressurized
Experiment consolidates permeability test with lateral confinement under pressurised conditions, can also test facing for breakdown soil sample by adjusting water pump hydraulic pressure
Boundary's water pressure.
Detailed description of the invention:
Fig. 1 is the schematic diagram of experimental provision entirety；
Fig. 2 is the top view of upper permeable iron plate；
Fig. 3 is the side view of upper permeable iron plate；
The top view of Fig. 4 permeable iron plate under being；
The side view of Fig. 5 permeable iron plate under being；
Fig. 6 is the schematic diagram of jack position fixing groove；
Fig. 7 is the schematic diagram with thick stick cross section.
Specific embodiment:
The present invention provides a kind of Thief zone sand-pebble layer earth pressure balanced shield, EPBS consolidation permeability experimental facility, it is characterised in that: should
Device includes four part of subject and compression system；
Subject include test cylinder (1), the whippletree (4) at the top of test cylinder, upper permeable iron plate (10) and under permeable iron plate
(13)；Whippletree (4) is fixed at the top of test cylinder (1), upper permeable iron plate (10) and under permeable iron plate (13) setting exist
In test cylinder (1), under permeable iron plate (13) setting be arranged in the bottom of test cylinder (1), upper permeable iron plate (10) lower
Above water iron plate (13), upper permeable iron plate (10) and under form the space for accommodating and testing the soil body (2) between permeable iron plate (13)；
It is respectively arranged with the first outlet valve (15), the second outlet valve from top to bottom in the side wall of test cylinder (1)
(17), third outlet valve (19) and cylinder bottommost water inlet valve (21)；
Displacement meter (8) are fixed with by electromagnet (7) in the top of test cylinder (1), the end of probe of displacement meter 8 is placed on permeable
At the top of iron plate (10)；
Compression system is arranged between upper permeable iron plate (10) and the whippletree (4) at top, for the reality below upper permeable iron plate (10)
Test the soil body (2) pressurization.
The whippletree be by two same models channel steel concave surface it is opposite be welded into hollow cuboid, and at lower central
As jack position fixed groove, whippletree is mainly used for providing impetus when pressurizeing hollow cylinder to jack in welding,
Fixing groove is then used to fix jack position, avoids shifting in pressurization.
The inner wall of test cylinder (1) is provided with graduated scale (9).The graduated scale is common steel ruler, is fixed on cylinder with iron nail
Internal wall, acting predominantly on and loading various soil mass in proportion is that the height value of front and back is loaded on graduated scale to determine by reading
Banket the actual volume of body.
Compression system is jack (6), and the upper end of jack (6) connects whippletree (4), fixes the upper end；Jack (6)
Lower end contact permeable iron plate (10)；
Load transducer (14) are provided between jack (6) and upper permeable iron plate (10).
Upper permeable iron plate (10) includes barrel mast (25) and is arranged on the chassis (24) with permeable hole of barrel mast (25) bottom,
The bottom of jack (6) is put in barrel mast (25), and chassis (24) withstand the experiment soil body (2) when using, and the end of probe of displacement meter 8 is put
In barrel mast (25) upper end.Upper permeable iron plate is placed on cylinder body bottom, by with a thickness of 5mm, diameter is 5mm smaller than test cylinder diameter
Round discus be made, and internal diameter of wherein burn-oning in one side again is 150mm, outer diameter 155mm, the hollow cylinder of a height of 100mm
Body, is distributed according to the law of the circumference the permeable hole that full diameter is 10mm outside cylindrical body, and the then not aperture in hollow cylinder body is main to make
With being that the water for allowing the soil body to ooze out is oozed out from permeable hole, and hollow cylinder body wall then plays a water proof and provides for internal jack
The platform of one uniform pressurization and the datum level of measurement change in displacement is provided for displacement meter；Permeable iron plate removes open circles under described
Permeable hole and cylindrical body lower part is distributed with there are four outside the apopore of omnidirectional distribution in column body, remaining feature and upper permeable iron plate
Described consistent, main function is support top soil sample, opens up water layer for cylinder lower part, provides stable and uniform hydraulic pressure
Power.
Under permeable iron plate (13) include collet (27) and setting collet (27) upper end the permeable supporting plate with permeable hole
(26), collet (27) is contacted with test cylinder (1) bottom, and when use, permeable supporting plate (26) held the experiment soil body (2), cylinder bottommost
Water inlet valve (21) is connected to the space of permeable supporting plate (26) lower part.
Permeable gauze (12) are provided with above permeable supporting plate (26), in use, the experiment soil body (2) is arranged in permeable gauze
(12) on.(permeable gauze effect: 1, mitigates initial water pump flood pressure to the souring of the soil body, bottom soil body is made to become loose；
2, it avoids sand from falling suck-back, is entered in water pump by (21) channel and broken ring is generated to water pump component, shorten water pump service life)
Water delivery rubber hose (16) are connected at first outlet valve (15), and flexible pipe outlet is placed in collecting-tank (24).
The second water pressure sensor is respectively arranged at second outlet valve (17) and third outlet valve (19)
(18) and third water pressure sensor (20).(second and the effect of third water outlet: 1, in experiment need measure two water outlets
Hydraulic pressure force value simultaneously keeps a record；2, it can use it after the end of the experiment to drain step by step from high to low, avoid merely with channel (21)
It drains and hydraulic pressure problems of too occurs.)
Water inlet pressure sensor (22) are provided at water inlet valve (21)；Water inlet valve (21) passes through water delivery rubber tube
(23) water pump (3) are connected to.
Water pressure sensor, displacement meter and load transducer connect acquisition real time continuous data with computer to guarantee to test
The validity and science of data；The water pressure sensor of its middle cylinder body bottommost is the hydraulic pressure for acquiring water pump output, main
It is used to cooperate and adjusts water pump output power and test critical pressure, and remaining two water pressure sensors are for acquiring out
Mouth of a river hydraulic pressure, for due to consideration that the hydraulic pressure of lower part water pump pressurization may be excessive, therefore using in the calculating of permeability test
Water pressure sensor replaces traditional pressure-measuring pipe to observe hydraulic pressure, both ensure that the continuous of data acquisition and accurately in turn avoid because
Hydraulic pressure is excessive and the problem of can not reading；Wherein displacement meter is for acquiring the height change data after the soil body pressurizes, thus instead
Reflect the degree of consolidation of the soil body at this time；Wherein load transducer is the pressure being applied on the soil body for acquiring jack.
The experiment side implemented using above-mentioned Thief zone sand-pebble layer earth pressure balanced shield, EPBS consolidation permeability experimental facility
Method, it is characterised in that: method includes the following steps:
A, by the first outlet valve (15), the second outlet valve (17), third outlet valve (19) and cylinder bottommost into
Mouth of a river valve (21) installs and first valve is allowed to be in close state, and connects cylinder second is connected with third water outlet
The water inlet pressure sensor of two water pressure sensors (18), third water pressure sensor (20) and cylinder body bottom water inlet
(22), water pump (3) are connected with rubber tube in water inlet, it is soft in the water outlet connection water delivery rubber for being located at cylinder topmost
It manages (16), and flexible pipe outlet is placed in collecting-tank (24), permeable iron plate (13) is put into the bottom of test cylinder by under, and spreads
If good permeable gauze (12), then start layering and load the experiment soil body (2), water pump (3) are opened after filling reaches the soil body
Saturation is placed upper permeable iron plate (10) on the soil body, is sequentially placed in the hollow cylinder barrel mast (25) of upper permeable iron plate (10)
Load transducer (14) and jack (6), then by the jack position fixed groove of the top of jack (6) insertion whippletree (4)
(5) in, finally with electromagnet, (7 fix displacement meter (8), and the end of probe of displacement meter (8) is placed on upper permeable iron plate (10) and is pushed up
Portion can open the certain hydraulic pressure of water pump (3) holding after having debugged data collection system, so that more than upper permeable iron plate (10)
When the water surface and water outlet maintain an equal level, the constant head permeability test under being not pressurized；
B, it is pressurizeed using jack (6) to the soil body (2), pressure at this time is measured by the load transducer (14) of its underpart
Value, the soil body (2) generates consolidation phenomenon under a certain pressure value, measures consolidation journey by the displacement data of displacement meter (8) acquisition
Degree opens water pump (3) at this time and keeps certain hydraulic pressure, and the constant head lateral confinement carried out under pressurized state consolidates permeability test；
C, the pressurized state for keeping jack (6), is gradually increased the hydraulic pressure of water pump (3), until the top of upper permeable iron plate (10)
Water layer generates more bubble, records the hydraulic pressure force value of water inlet pressure sensor (22) at this time, this pressure value is that water flow breakdown is real
Test the critical pressure of the soil body.
A kind of Thief zone sand-pebble layer earth pressure balanced shield, EPBS of the invention consolidates permeability experimental facility, realizes to hypertonic
The shield machine face front end soil body, which is pressurized, in saturating sand-pebble layer earth pressure balanced shield, EPBS construction propulsion occurs consolidation process of osmosis
Simulation, using high-precision sensor acquisition system, can continuously and accurately acquire data, preferably reflect soil body penetration system
Relationship between several variations and propelling pressure and water pressure preferably reflects the effect of sediment improvement, provides for practice of construction
Certain guidance reference.
Claims (10)
1. a kind of Thief zone sand-pebble layer earth pressure balanced shield, EPBS consolidates permeability experimental facility, it is characterised in that: the device includes
Subject and compression system；
Subject include test cylinder (1), the whippletree (4) at the top of test cylinder, upper permeable iron plate (10) and under permeable iron plate
(13)；Whippletree (4) is fixed at the top of test cylinder (1), upper permeable iron plate (10) and under permeable iron plate (13) setting exist
In test cylinder (1), under permeable iron plate (13) setting be arranged in the bottom of test cylinder (1), upper permeable iron plate (10) lower
Above water iron plate (13), upper permeable iron plate (10) and under form the space for accommodating and testing the soil body (2) between permeable iron plate (13)；
It is respectively arranged with the first outlet valve (15), the second outlet valve from top to bottom in the side wall of test cylinder (1)
(17), third outlet valve (19) and cylinder bottommost water inlet valve (21)；
Displacement meter (8) are fixed with by electromagnet (7) in the top of test cylinder (1), the end of probe of displacement meter 8 is placed on permeable
At the top of iron plate (10)；
Compression system is arranged between upper permeable iron plate (10) and the whippletree (4) at top, for the reality below upper permeable iron plate (10)
Test the soil body (2) pressurization.
2. Thief zone sand-pebble layer earth pressure balanced shield, EPBS according to claim 1 consolidates permeability experimental facility, feature
Be: the inner wall of test cylinder (1) is provided with graduated scale (9).
3. Thief zone sand-pebble layer earth pressure balanced shield, EPBS according to claim 1 or 2 consolidates permeability experimental facility, special
Sign is: compression system is jack (6), and the upper end of jack (6) connects whippletree (4), fixes the upper end；Jack (6)
Lower end contact permeable iron plate (10)；
Load transducer (14) are provided between jack (6) and upper permeable iron plate (10).
4. Thief zone sand-pebble layer earth pressure balanced shield, EPBS according to claim 3 consolidates permeability experimental facility, feature
Be: upper permeable iron plate (10) includes barrel mast (25) and is arranged on the chassis (24) with permeable hole of barrel mast (25) bottom, thousand
The bottom on jin top (6) is put in barrel mast (25), and chassis (24) withstand the experiment soil body (2) when using, and the end of probe of displacement meter 8 is placed on
Barrel mast (25) upper end.
5. Thief zone sand-pebble layer earth pressure balanced shield, EPBS according to claim 3 consolidates permeability experimental facility, feature
Be: under permeable iron plate (13) include collet (27) and setting collet (27) upper end the permeable supporting plate with permeable hole
(26), collet (27) is contacted with test cylinder (1) bottom, and when use, permeable supporting plate (26) held the experiment soil body (2), cylinder bottommost
Water inlet valve (21) is connected to the space of permeable supporting plate (26) lower part.
6. Thief zone sand-pebble layer earth pressure balanced shield, EPBS according to claim 5 consolidates permeability experimental facility, feature
It is: is provided with permeable gauze (12) above permeable supporting plate (26), in use, the experiment soil body (2) is arranged in permeable gauze
(12) on.
7. Thief zone sand-pebble layer earth pressure balanced shield, EPBS according to claim 1 consolidates permeability experimental facility, feature
It is: connects water delivery rubber hose (16) at the first outlet valve (15), and flexible pipe outlet is placed in collecting-tank (24).
8. Thief zone sand-pebble layer earth pressure balanced shield, EPBS according to claim 1 consolidates permeability experimental facility, feature
Be: be respectively arranged at the second outlet valve (17) and third outlet valve (19) the second water pressure sensor (18) and
Third water pressure sensor (20).
9. Thief zone sand-pebble layer earth pressure balanced shield, EPBS according to claim 1 consolidates permeability experimental facility, feature
It is: is provided with water inlet pressure sensor (22) at water inlet valve (21)；Water inlet valve (21) passes through water delivery rubber tube
(23) water pump (3) are connected to.
10. being implemented using Thief zone sand-pebble layer earth pressure balanced shield, EPBS consolidation permeability experimental facility described in claim 1
Experimental method, it is characterised in that: method includes the following steps:
A, by the first outlet valve (15), the second outlet valve (17), third outlet valve (19) and cylinder bottommost into
Mouth of a river valve (21) installs and first valve is allowed to be in close state, and connects cylinder second is connected with third water outlet
The water inlet pressure sensor of two water pressure sensors (18), third water pressure sensor (20) and cylinder body bottom water inlet
(22), water pump (3) are connected with rubber tube in water inlet, it is soft in the water outlet connection water delivery rubber for being located at cylinder topmost
It manages (16), and flexible pipe outlet is placed in collecting-tank (24), permeable iron plate (13) is put into the bottom of test cylinder by under, and spreads
If good permeable gauze (12), then start layering and load the experiment soil body (2), water pump (3) are opened after filling reaches the soil body
Saturation is placed upper permeable iron plate (10) on the soil body, is sequentially placed in the hollow cylinder barrel mast (25) of upper permeable iron plate (10)
Load transducer (14) and jack (6), then by the jack position fixed groove of the top of jack (6) insertion whippletree (4)
(5) in, finally with electromagnet, (7 fix displacement meter (8), and the end of probe of displacement meter (8) is placed on upper permeable iron plate (10) and is pushed up
Portion can open the certain hydraulic pressure of water pump (3) holding after having debugged data collection system, so that more than upper permeable iron plate (10)
When the water surface and water outlet maintain an equal level, the constant head permeability test under being not pressurized；
B, it is pressurizeed using jack (6) to the soil body (2), pressure at this time is measured by the load transducer (14) of its underpart
Value, the soil body (2) generates consolidation phenomenon under a certain pressure value, measures consolidation journey by the displacement data of displacement meter (8) acquisition
Degree opens water pump (3) at this time and keeps certain hydraulic pressure, and the constant head lateral confinement carried out under pressurized state consolidates permeability test；
C, the pressurized state for keeping jack (6), is gradually increased the hydraulic pressure of water pump (3), until the top of upper permeable iron plate (10)
Water layer generates more bubble, records the hydraulic pressure force value of water inlet pressure sensor (22) at this time, this pressure value is that water flow breakdown is real
Test the critical pressure of the soil body.
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