CN106290077A - The full water stratum face soil body is in three-dimensional stress lower critical infiltration pressure testing device and test method - Google Patents
The full water stratum face soil body is in three-dimensional stress lower critical infiltration pressure testing device and test method Download PDFInfo
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- CN106290077A CN106290077A CN201610972503.4A CN201610972503A CN106290077A CN 106290077 A CN106290077 A CN 106290077A CN 201610972503 A CN201610972503 A CN 201610972503A CN 106290077 A CN106290077 A CN 106290077A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 238000012360 testing method Methods 0.000 title claims abstract description 50
- 230000008595 infiltration Effects 0.000 title claims abstract description 31
- 238000001764 infiltration Methods 0.000 title claims abstract description 31
- 239000002689 soil Substances 0.000 title claims abstract description 25
- 238000010998 test method Methods 0.000 title claims abstract description 5
- 239000012466 permeate Substances 0.000 claims abstract description 6
- 239000004575 stone Substances 0.000 claims description 44
- 239000004927 clay Substances 0.000 claims description 37
- 239000007788 liquid Substances 0.000 claims description 32
- 229920006395 saturated elastomer Polymers 0.000 claims description 28
- 238000007906 compression Methods 0.000 claims description 14
- 230000006835 compression Effects 0.000 claims description 14
- 229920001971 elastomer Polymers 0.000 claims description 14
- 238000004088 simulation Methods 0.000 claims description 14
- 230000000740 bleeding effect Effects 0.000 claims description 13
- 239000012528 membrane Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 9
- 239000000446 fuel Substances 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000009472 formulation Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 18
- 238000002474 experimental method Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000005514 two-phase flow Effects 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
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/04—Investigating osmotic effects
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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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Abstract
The invention discloses a kind of full water stratum face soil body and permeate pressure testing device and test method at three-dimensional stress lower critical, including sample saturation unit, critical infiltration air pressure test cell, axial compressive force analogue unit, radially confined pressure analogue unit.This device can accurately test out the quantitative relationship of the soil body of full water stratum face different aperture ratio critical infiltration air pressure under different three-dimensional stresses and infiltration air pressure and gas loss rate, thus provide reliable Key experiments data and foundation for full water stratum shield tunnel tool changing with pressure construction, on the premise of face stability is effectively ensured, reduce construction cost, there is provided construction speed, it is ensured that construction safety.
Description
Technical field
The present invention relates to a kind of full water stratum face soil body in three-dimensional stress lower critical infiltration pressure testing device and examination
Proved recipe method.
Background technology
Carry out in Analysis on Shield Tunnel Driven Process in tunnel by full water stratum, along with the continuous abrasion of shield cutter, driving effect
Rate constantly reduces, and needs to be replaced cutter.If carrying out normal pressure tool changing, face is pole under hydraulic pressure with the common effect of soil pressure
Easily there is unstable failure, seriously jeopardize tool changing operating personnel's safety, affect construction progress.Tool changing technology with pressure utilizes air to compress
Machine is by air pressurized, and injects voltage stabilizing cabin, makes air pressure progressively discharge in cabin while reaching dynamic equilibrium with earth pressure in cabin
The soil body, and balance cutterhead front water, soil pressure further by setting up rational air pressure in voltage stabilizing cabin, make excavation face reach
Stablize and prevent subsoil water from pouring in cabin interior, enhancing face stability, drastically increasing the safety of tool changing personnel
And work efficiency.Tool changing technology the most with pressure is now widely used in Jiang Yuehai tunnel, urban subway tunnel construction.Mesh
The subject matter of the correlation test equipment of front simulation tool changing with pressure construction is that (1) test cannot realize sample by same device
Saturated and follow-up infiltration air pressure measures, owing to sample is fully saturated to putting rubber pattern, installing permeable and put into test apparatus
In, undisturbed sample can be caused the most unnecessary artificial disturbance, cause sample structure to destroy so that result of the test is inaccurate；
(2) method that existing testing equipment uses lateral spacing mostly, along with the increase of axial compression, confining pressure also can increase and cannot be quantitative
Control, in test, the soil body also can change along with the entrance of gas, soil body confined pressure, and these are all tool changing rings with pressure with reality
Border has bigger difference, it is impossible to truly simulates soil body three-dimensional stress constraint in actual environment and water-loading coupled action process, makes
Become result of the test distortion.
If be therefore directly used in the result of the test of gas loss rate according to the infiltration air pressure of original testing equipment gained
Shield tunnel tool changing with pressure is constructed, or air pressure is less than being actually needed air pressure, causes subsoil water to pour out, has a strong impact on area
Face and supporting construction stability, jeopardize tool changing personal security, have a strong impact on construction speed；Air pressure is more than being actually needed gas
Pressure, significantly increases tool changing difficulty with pressure, construction cost, lowers speed of application, is good for the health carrying out tool changing personnel with pressure
Health also brings along and has a strong impact on；Even if air pressure is close to being actually needed value, also also can be very big because of the inaccurate of gas loss rate prediction
Ground increases construction cost, jeopardizes tool changing personal security with pressure.
Summary of the invention
It is an object of the invention to provide the full water stratum face soil body and permeate pressure testing device at three-dimensional stress lower critical,
This device can accurately test out the critical infiltration under different three-dimensional stresses of the soil body of full water stratum face different aperture ratio
Air pressure and the quantitative relationship of infiltration air pressure and gas loss rate, thus carry for the shield tunnel tool changing with pressure construction of full water stratum
For reliable Key experiments data and foundation, on the premise of face stability is effectively ensured, reduce construction cost, it is provided that execute
Work progress, it is ensured that construction safety.
The technical solution adopted in the present invention is:
A kind of full water stratum face soil body permeates pressure testing device at three-dimensional stress lower critical, including the saturated list of sample
Infiltration air pressure test cell first, critical, axial compressive force analogue unit, radially confined pressure analogue unit；
Sample saturation unit: include sidewall (7), upper dankness stone (1), lower permeable stone (2) and upper cover (6) and base (9), former
Shape sample (4) puts water proof rubber membrane (3) and loads in sidewall (7), and makes sidewall (7) fit tightly with water proof rubber membrane (3), and
Undisturbed sample (4) top is fitted tightly with high osmosis upper dankness stone (1), lower permeable stone (2) respectively with bottom, under finally inciting somebody to action
Permeable stone (2) seals to set with the loading piston (16) in the groove of base (9) and is connected, by upper dankness stone (1) and upper cover (6)
Groove is set and is tightly connected；Upper cover (6) middle part arranges upper cover passage (5), and base (9) middle part is provided with base passages (10)；Enter
When row sample is saturated, base passages (10) is connected with gas-liquid pressure-flow control system (11), upper cover passage (5) and big gas phase
Even, open upper cover passage (5) and foot passage (10), maintain certain hydraulic pressure to former by gas-liquid pressure-flow control system (11)
Shape sample (4) carries out saturated, and after upper cover passage (5) continuous effluent, undisturbed sample (4) is the most fully saturated；
Critical infiltration air pressure test cell: by the sidewall (7) in sample saturation unit, upper dankness stone (1), lower permeable stone
(2) the ventilative upper pottery clay plates (12) of pressure-bearing wall (27), sealing and lower pottery clay plates (13) are replaced with, by the top of saturated sample (4)
Fit tightly with upper pottery clay plates (12), lower pottery clay plates (13) respectively with bottom, it is ensured that seal, then by lower pottery clay plates (13) and loading
Piston (16) seals and sets connection, and upper pottery clay plates (12) and bearing plate (24) are set and be tightly connected, pressure-bearing wall (27) and upper cover
(6) and base (9) seal set composition pressure chamber (21)；The groove at base (9) middle part is fixed with oil cylinder (22), oil cylinder (22)
Internal load bar (25) is connected with loading piston (16), loads piston (16) and extends upwardly into pressure chamber (21)；Base (9) is positioned at
Position between pressure chamber (21) inner chamber and oil cylinder (22) is provided with the water intaking valve (18) to pressure chamber (21) water filling；Upper cover passage
(5) it is connected with gas-liquid pressure-flow testing system (14), base passages (10) and gas-liquid pressure-flow control system (11) phase
Even, base passages (10) runs through loading piston (16)；Gas-liquid pressure-flow control system (11) is right by foot passage (10)
Undisturbed sample (4) applies and maintains the atmospheric pressure value of formulation, upper cover passage (5) to be connected with gas-liquid pressure-flow testing system (14),
Gas through undisturbed sample (4) is carried out its pressure of synchronous recording, flow and flow velocity；
Axial compressive force analogue unit includes GDS axial compression control system (19), fuel inlet fitting (17), delivery connection (20), oil
Cylinder (22), loading piston (16), GDS axial compression control system, by being connected with fuel inlet fitting (17), delivery connection (20), controls the end
The pressure in oil cylinder (22) fixing in the groove at seat (9) middle part, the internal load bar (25) of oil cylinder (22) with load piston
(16) it is connected；GDS axial compression control system (19) by load piston (16) to undisturbed sample (4) apply set axial compressive force with
The axial compressive force of simulation tunnel；
Radially confined pressure analogue unit: include pressure chamber (21), base (9) be positioned at pressure chamber (21) inner chamber and oil cylinder (22) it
Between position be provided with the water intaking valve (18) to pressure chamber (21) water filling, upper cover (6) is provided with the air bleeding valve connected with pressure chamber (21)
(15), water intaking valve (18) is connected with radially confined pressure control system (26)；Radially confined pressure control system (26) by water intaking valve (18),
Pressure chamber (21), applies radial pressure radial direction confined pressure σ 3 with simulation tunnel of setting to undisturbed sample (4).
Carry out the full water stratum face soil body according to described full critical infiltration pressure testing device to face under three-dimensional stress
The test method of boundary's infiltration air pressure test, its specific practice is:
A., undisturbed sample (4) puts water proof rubber membrane (3) load in sidewall (7), and make sidewall (7) and water proof rubber membrane
(3) fit tightly, and by undisturbed sample (4) top with bottom respectively with high osmosis upper dankness stone (1), lower permeable stone (2) tightly
Closely connected conjunction, finally sets lower permeable stone (2) with loading piston (16) sealing in the groove of base (9) and is connected, by upper permeable
The groove of stone (1) and upper cover (6) is set and is tightly connected；
B. sample saturation process: open upper cover passage (5) and foot passage (10), by gas-liquid pressure-flow control system
(11) certain hydraulic pressure (50kPa) is maintained to carry out saturated to undisturbed sample (4), after upper cover passage (5) continuous effluent, undisturbed sample
(4) the most fully saturated；
C. saturated sample device in the middle part of device is replaced with the pressure-bearing wall (27) transparent by outer wall and upper cover (6) and base (9)
Seal the pressure chamber (21) setting composition, and by the high osmosis upper dankness stone (1) at undisturbed sample (4) two ends, lower permeable stone (2)
Pull down, replace with sealing, ventilative upper pottery clay plates (12), lower pottery clay plates (13), equally the top of saturated sample is divided with bottom
Do not fit tightly with upper pottery clay plates (12), lower pottery clay plates (13), it is ensured that seal, then by lower pottery clay plates (13) and loading piston (16)
Connection is set in sealing, and former upper pottery clay plates (12) and bearing plate (24) are set and be tightly connected；
D. tightening pull bar (8) nut, unclamp the air bleeding valve (15) of upper cover (6), confined pressure control system (26) passes through water intaking valve
(18) to pressure chamber (21) water filling, when air bleeding valve (15) has water to close air bleeding valve (15) when overflowing；
The axial compressive force that E.GDS axial compression control system (19) sets by loading piston (16) to apply to undisturbed sample (4)
Axial compressive force with simulation tunnel；Confined pressure control system (26) passes through water intaking valve (18), pressure chamber (21), to undisturbed sample (4)
Apply the radial pressure radial direction confined pressure with simulation tunnel of setting；
F. undisturbed sample (4) is applied also by foot passage (10) by gas-liquid pressure-flow control system (11)
Maintain the atmospheric pressure value formulated, and to the gas-liquid pressure-flow rate test by upper cover passage (5) of the gas through undisturbed sample (4)
System (14) is connected, the pressure of synchronous recording gas, flow and flow velocity；The full water formation tunnel face difference hole of final acquisition
Gap is than the soil body critical infiltration air pressure under different three-dimensional stress states, gas loss rate, and sets up infiltration air pressure and gas
The quantitative relationship of loss rate.
Compared with prior art, the invention has the beneficial effects as follows:
1, sample is achieved from the integration operation being saturated to permeate the correlation tests such as air pressure test so that sample is unmanned
For achieving the saturated of sample on the premise of disturbance in the same apparatus and permeating the correlation tests such as air pressure test, improve test
Precision；
2, by pressure chamber water filling, in pressure chamber, sample surrounding forms the hydraulic pressure radial direction pressure with simulation tunnel country rock
Power, applies the pressure axial compressive force with simulation tunnel country rock by oil cylinder to the end face of sample；
3, use gas-liquid pressure-flow control system that sample applies by base passages and maintains different atmospheric pressure value,
And to the gas-liquid pressure-flow testing system by upper cover passage of the gas through sample, synchro measure, the pressure of record gas
Power, flow and flow velocity；
4, during test, the stress field environment of sample and water-air two phase flows process with actual tunnel closely, to solid,
Liquid, gas are multiphase coupled can completely, reasonably simulate.Can be by using this device and corresponding method, can be accurate
Obtain quantitative than the soil body critical infiltration air pressure under different three-dimensional stresses and infiltration air pressure and gas seepage velocity of different aperture
Relation, thus provide reliable Key experiments data and foundation, effectively for full water stratum shield tunnel tool changing with pressure construction
On the premise of ensureing face stability, reduce construction cost, it is provided that construction speed, it is ensured that construction safety.
Accompanying drawing explanation
Fig. 1 is the structural representation of sample saturation unit of the present invention.
Fig. 2 is the structural representation of the present invention critical infiltration air pressure test cell.
Fig. 3 is the enlarged diagram of pressure chamber.
1 upper dankness stone, 2 times permeable stones, 3 water proof rubber membranes, 4 undisturbed samples, 5 upper cover passages, 6 upper covers, 7 sidewalls, 8 draw
Bar, 9 bases, 10 base passages, 11 gas-liquid pressures-flow control system, pottery clay plates on 12,13 times pottery clay plates, 14 gas-liquid pressures-
Flow testing system, 15 air bleeding valves, 16 load piston, and 17 fuel inlet fittings, 18 water intaking valves, 19GDS axial compression control system, 20 is fuel-displaced
Joint, 21 pressure chamberes, 22 oil cylinders, 24 bearing plates, 25 load bars, 26 radial direction confined pressure control systems, 27 pressure-bearing walls；
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
Fig. 1, Fig. 2, Fig. 3 illustrate, a kind of full water stratum face soil body is at three-dimensional stress lower critical infiltration air pressure test dress
Put, including sample saturation unit, critical infiltration air pressure test cell, axial compressive force analogue unit, radially confined pressure analogue unit；
Sample saturation unit: include that sidewall 7, upper dankness stone 1, lower permeable stone 2 and upper cover 6 and base 9, sidewall 7 are bottomless
Cylindrical shape, undisturbed sample 4 puts water proof rubber membrane 3 and loads in sidewall 7, and makes sidewall 7 fit tightly with water proof rubber membrane 3, and
Undisturbed sample 4 top is fitted tightly, finally by lower permeable stone with high osmosis upper dankness stone 1, lower permeable stone 2 respectively with bottom
2 seal with the loading piston 16 in the groove of base 9 and to set and be connected, and the groove of upper dankness stone 1 with upper cover 6 are set sealing even
Connect；Upper cover passage 5 is set in the middle part of upper cover 6, in the middle part of base 9, is provided with base passages 10；Carry out sample saturated time, base passages 10
Being connected with gas-liquid pressure-flow control system 11, upper cover passage 5 is connected with air, opens upper cover passage 5 and foot passage 10,
Maintain certain hydraulic pressure (50kPa) to carry out saturated to undisturbed sample 4 by gas-liquid pressure-flow control system 11, treat that upper cover passage 5 is even
After continuous water outlet, undisturbed sample 4 is that is fully saturated.
Critical infiltration air pressure test cell: the sidewall 7 in sample saturation unit, upper dankness stone 1, lower permeable stone 2 are replaced
The upper pottery clay plates 12 ventilative for pressure-bearing wall 27, sealing and lower pottery clay plates 13, by the top of saturated sample 4 and bottom respectively with upper pottery
Soil plate 12, lower pottery clay plates 13 fit tightly, it is ensured that seal, more lower pottery clay plates 13 and loading piston 16 are sealed and set connection, will
Upper pottery clay plates 12 and bearing plate 24 are set and are tightly connected, and pressure-bearing wall 27 and upper cover 6 and base 9 seal sets composition pressure chamber 21.
Being fixed with oil cylinder 22 in groove in the middle part of base 9, the load bar 25 within oil cylinder 22 is connected with loading piston 16, loads piston 16
Extend upwardly into pressure chamber 21；The base 9 position between pressure chamber 21 inner chamber and oil cylinder 22 is provided with to pressure chamber 21 water filling
Water intaking valve 18.Upper cover passage 5 is connected with gas-liquid pressure-flow testing system 14, base passages 10 and gas-liquid pressure-flow-control
System 11 is connected, and base passages 10 runs through loading piston 16.Foot passage is passed through by gas-liquid pressure-flow control system 11
10 pairs of undisturbed samples 4 apply and maintain the atmospheric pressure value of formulation, and upper cover passage 5 is connected with gas-liquid pressure-flow testing system 14, right
Gas through undisturbed sample 4 carries out its pressure of synchronous recording, flow and flow velocity.
Axial compressive force analogue unit includes GDS axial compression control system 19, fuel inlet fitting 17, delivery connection 20, oil cylinder 22, adds
Carrying piston 16, GDS axial compression control system, by being connected with fuel inlet fitting 17, delivery connection 20, controls in the groove in the middle part of base 9
The fixing pressure in oil cylinder 22, the load bar 25 within oil cylinder 22 is connected with loading piston 16.GDS axial compression control system 19 is led to
Cross loading piston 16 and apply the axial compressive force axial compressive force with simulation tunnel of setting to undisturbed sample 4.
Radially confined pressure analogue unit: include pressure chamber 21, the base 9 position between pressure chamber 21 inner chamber and oil cylinder 22
Being provided with the water intaking valve 18 to pressure chamber 21 water filling, upper cover 6 is provided with the air bleeding valve 15 connected with pressure chamber 21, water intaking valve 18 and radial direction
Confined pressure control system 26 is connected；Radially confined pressure control system 26 is by water intaking valve 18, pressure chamber 21, applies to set to undisturbed sample 4
Fixed radial pressure is with radial direction confined pressure σ 3 of simulation tunnel.
The full water stratum face soil body using this example carries out full water at three-dimensional stress lower critical infiltration pressure testing device
The stratum face soil body permeates air pressure testing experiment method at three-dimensional stress lower critical, and its specific practice is:
A. undisturbed sample 4 is put water proof rubber membrane 3 to load in sidewall 7, and make sidewall 7 closely paste with water proof rubber membrane 3
Close, and undisturbed sample 4 top is fitted tightly with high osmosis upper dankness stone 1, lower permeable stone 2 respectively with bottom, under finally inciting somebody to action
Permeable stone 2 seals to set with the loading piston 16 in the groove of base 9 and is connected, and sets close by upper dankness stone 1 with the groove of upper cover 6
Envelope connects.
B. sample saturation process: open upper cover passage 5 and foot passage 10, tie up by gas-liquid pressure-flow control system 11
Holding 50kPa hydraulic pressure and carry out saturated to undisturbed sample 4, after upper cover passage 5 continuous effluent, undisturbed sample 4 is that is fully saturated；
C. saturated sample device in the middle part of device is replaced with the pressure-bearing wall 27 transparent by outer wall and upper cover 6 and base 9 seals embedding
Put the pressure chamber 21 of composition, and high osmosis upper dankness stone 1, the lower permeable stone 2 at undisturbed sample 4 two ends are pulled down, till replacement
Water, ventilative upper pottery clay plates 12, lower pottery clay plates 13, equally by the top of saturated sample and bottom respectively with upper pottery clay plates 12, under
Pottery clay plates 13 fits tightly, it is ensured that seal, more lower pottery clay plates 13 and loading piston 16 is sealed and set connection, by upper pottery clay plates 12
Set with bearing plate 24 and be tightly connected；
D. tightening pull bar 8 nut, unclamp the air bleeding valve 15 of upper cover 6, confined pressure control system 26 passes through water intaking valve 18 to pressure
Room 21 water filling, when air bleeding valve 15 has water to close air bleeding valve 15 when overflowing；
E.GDS axial compression control system 19 applies the axial compressive force of setting with simulation by loading piston 16 to undisturbed sample 4
The axial compressive force in tunnel；Confined pressure control system 26, by water intaking valve 18, pressure chamber 21, applies the radial direction set to undisturbed sample 4
Pressure is with the radial direction confined pressure of simulation tunnel；
F. by foot passage 10 by gas-liquid pressure-flow control system 11 undisturbed sample 4 is applied and maintains system
Fixed atmospheric pressure value, and the gas through undisturbed sample 4 is connected by the gas-liquid pressure-flow testing system 14 of upper cover passage 5,
The pressure of synchronous recording gas, flow and flow velocity；Finally obtain full water formation tunnel face different aperture than the soil body not
With three-dimensional stress state under critical infiltration air pressure, gas loss rate, and set up the quantitative of infiltration air pressure and gas loss rate
Relation.
It should be appreciated that for those of ordinary skills, can be improved according to the above description or be converted,
And all these modifications and variations all should belong to the protection domain of claims of the present invention.
Claims (2)
1. a full water stratum face soil body permeates pressure testing device at three-dimensional stress lower critical, it is characterised in that include
Sample saturation unit, critical infiltration air pressure test cell, axial compressive force analogue unit, radially confined pressure analogue unit；
Sample saturation unit: include sidewall (7), upper dankness stone (1), lower permeable stone (2) and upper cover (6) and base (9), original state is tried
Sample (4) puts water proof rubber membrane (3) and loads in sidewall (7), and makes sidewall (7) fit tightly with water proof rubber membrane (3), and by former
Shape sample (4) top and bottom fit tightly with high osmosis upper dankness stone (1), lower permeable stone (2) respectively, permeable under finally inciting somebody to action
Stone (2) seals to set with the loading piston (16) in the groove of base (9) and is connected, by the groove of upper dankness stone (1) Yu upper cover (6)
Set and be tightly connected；Upper cover (6) middle part arranges upper cover passage (5), and base (9) middle part is provided with base passages (10)；Try
When sample is saturated, base passages (10) is connected with gas-liquid pressure-flow control system (11), and upper cover passage (5) is connected with air, beats
Open upper cover passage (5) and foot passage (10), maintain certain hydraulic pressure to undisturbed sample by gas-liquid pressure-flow control system (11)
(4) carrying out saturated, after upper cover passage (5) continuous effluent, undisturbed sample (4) is the most fully saturated；
Critical infiltration air pressure test cell: the sidewall (7) in sample saturation unit, upper dankness stone (1), lower permeable stone (2) are replaced
It is changed to the ventilative upper pottery clay plates (12) of pressure-bearing wall (27), sealing and lower pottery clay plates (13), by top and the bottom of saturated sample (4)
Fit tightly with upper pottery clay plates (12), lower pottery clay plates (13) respectively, it is ensured that seal, then by lower pottery clay plates (13) and loading piston
(16) seal set connection, upper pottery clay plates (12) and bearing plate (24) are set and are tightly connected, pressure-bearing wall (27) and upper cover (6) and
Base (9) seals sets composition pressure chamber (21)；Being fixed with oil cylinder (22) in the groove at base (9) middle part, oil cylinder (22) is internal
Load bar (25) with load piston (16) be connected, loading piston (16) extend upwardly into pressure chamber (21)；Base (9) is positioned at pressure
Position between room (21) inner chamber and oil cylinder (22) is provided with the water intaking valve (18) to pressure chamber (21) water filling；Upper cover passage (5) with
Gas-liquid pressure-flow testing system (14) is connected, and base passages (10) is connected with gas-liquid pressure-flow control system (11), the end
Seat passage (10) runs through loading piston (16)；Gas-liquid pressure-flow control system (11) passes through foot passage (10) to original state
Sample (4) applies and maintains the atmospheric pressure value of formulation, and upper cover passage (5) is connected with gas-liquid pressure-flow testing system (14), to wearing
The gas crossing undisturbed sample (4) carries out its pressure of synchronous recording, flow and flow velocity；
Axial compressive force analogue unit includes GDS axial compression control system (19), fuel inlet fitting (17), delivery connection (20), oil cylinder
(22), loading piston (16), GDS axial compression control system, by being connected with fuel inlet fitting (17), delivery connection (20), controls base
(9) pressure in oil cylinder (22) fixing in the groove at middle part, the load bar (25) of oil cylinder (22) inside and loading piston (16)
It is connected；GDS axial compression control system (19) applies the axial compressive force of setting with simulation by loading piston (16) to undisturbed sample (4)
The axial compressive force in tunnel；
Radially confined pressure analogue unit: include that pressure chamber (21), base (9) are positioned between pressure chamber (21) inner chamber and oil cylinder (22)
Position is provided with the water intaking valve (18) to pressure chamber (21) water filling, and upper cover (6) is provided with the air bleeding valve (15) connected with pressure chamber (21),
Water intaking valve (18) is connected with radially confined pressure control system (26)；Radially confined pressure control system (26) passes through water intaking valve (18), pressure
Room (21), applies radial pressure radial direction confined pressure σ 3 with simulation tunnel of setting to undisturbed sample (4).
Full critical infiltration pressure testing device the most according to claim 1 carries out the full water stratum face soil body should in three-dimensional
The test method of power lower critical infiltration air pressure test, it is characterised in that its specific practice is:
A., undisturbed sample (4) puts water proof rubber membrane (3) load in sidewall (7), and make sidewall (7) and water proof rubber membrane (3)
Fit tightly, and undisturbed sample (4) top is closely pasted with high osmosis upper dankness stone (1), lower permeable stone (2) respectively with bottom
Close, finally lower permeable stone (2) is set with loading piston (16) sealing in the groove of base (9) and be connected, by upper dankness stone (1)
Set with the groove of upper cover (6) and be tightly connected；
B. sample saturation process: open upper cover passage (5) and foot passage (10), with gas-liquid pressure-flow control system (11)
Maintaining certain hydraulic pressure to carry out saturated to undisturbed sample (4), after upper cover passage (5) continuous effluent, undisturbed sample (4) is the fullest
With；
C. saturated sample device in the middle part of device is replaced with the pressure-bearing wall (27) transparent by outer wall and upper cover (6) and base (9) seals
Set the pressure chamber (21) of composition, and the high osmosis upper dankness stone (1) at undisturbed sample (4) two ends, lower permeable stone (2) are torn open
Under, replace with sealing, ventilative upper pottery clay plates (12), lower pottery clay plates (13), equally by the top of saturated sample with bottom respectively
Fit tightly with upper pottery clay plates (12), lower pottery clay plates (13), it is ensured that seal, then by close to lower pottery clay plates (13) and loading piston (16)
Envelope sets connection, and former upper pottery clay plates (12) and bearing plate (24) are set and be tightly connected；
D. tightening pull bar (8) nut, unclamp the air bleeding valve (15) of upper cover (6), confined pressure control system (26) passes through water intaking valve (18)
To pressure chamber (21) water filling, when air bleeding valve (15) has water to close air bleeding valve (15) when overflowing；
E.GDS axial compression control system (19) applies the axial compressive force of setting with mould by loading piston (16) to undisturbed sample (4)
Intend the axial compressive force in tunnel；Confined pressure control system (26) passes through water intaking valve (18), pressure chamber (21), applies to undisturbed sample (4)
The radial pressure set is with the radial direction confined pressure of simulation tunnel；
F. by foot passage (10) by gas-liquid pressure-flow control system (11) undisturbed sample (4) is applied and maintains
The atmospheric pressure value formulated, and to the gas-liquid pressure-flow testing system by upper cover passage (5) of the gas through undisturbed sample (4)
(14) it is connected, the pressure of synchronous recording gas, flow and flow velocity；The full water formation tunnel face different aperture ratio of final acquisition
The soil body critical infiltration air pressure under different three-dimensional stress states, gas loss rate, and set up infiltration air pressure and gas loss
The quantitative relationship of rate.
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