CN109406365A - A kind of three axis gas injection experimental rig of geotechnique and method of fast assembling-disassembling - Google Patents
A kind of three axis gas injection experimental rig of geotechnique and method of fast assembling-disassembling Download PDFInfo
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- CN109406365A CN109406365A CN201811446176.4A CN201811446176A CN109406365A CN 109406365 A CN109406365 A CN 109406365A CN 201811446176 A CN201811446176 A CN 201811446176A CN 109406365 A CN109406365 A CN 109406365A
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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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- 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
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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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
- 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
- G01N2015/0813—Measuring intrusion, e.g. of mercury
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Abstract
The invention discloses the three axis gas injection experimental rigs of geotechnique and method of a kind of fast assembling-disassembling, including pedestal, top cap and latex film, base top central protuberance is equipped with first boss, lower part permeable stone is fitted with outside the first boss of pedestal, first boss center is equipped with gas injection needle, pedestal side section is not connected with external air injection pipe and external water injection pipe, top cap bottom centre protrusion is equipped with second boss, top permeable stone is fitted with outside second boss, top cap side is connected with back-pressure pipe, back-pressure communicating pipe is equipped with inside top cap, the input end of back-pressure communicating pipe is placed at the top of the permeable stone of top, the outlet end of back-pressure communicating pipe is connected with back-pressure pipe；Latex film is connected between top cap and pedestal, latex film top is closed to be set in top cap bottom outside, and latex film bottom is closed to be set on the outside of base top.The present invention has many advantages, such as that structure is simple, installation and removal are quick, can be realized the free switching between ordinary triaxial test and gas injection test.
Description
Technical field
The present invention relates to geotechnical engineering geotechnique's laboratory test technical field more particularly to a kind of three axis of geotechnique of fast assembling-disassembling
Gas injection experimental rig and method.
Background technique
Currently, usually needing transport issues of the learning gas in rock soil medium in geotechnical engineering field.Such as: in large area
Weak soil Dredger Filling Engineering in, frequently with pressed gas injection hydraulic reclamation soil layer in cause the soil body to cleave under gas pressure, to reach
To the effect of quick-discharging consolidation；In the engineering measure for administering sand liquefaction, has to inject bubble in sand and prevent and treat sand
Liquefied method；In city refuse landfill engineering, the gas that rubbish generates for a long time to cover capping layer failure；Seabed
The free gas of preservation can penetrate overlying water and close object cap rock and loss etc. into ocean under gas hydrates layer, such
It is both needed in engineering it is to be understood that migration and intrusive behavior of the pressed gas in rock soil medium.However, geotechnological three axis in current interior
There is no gas injection experimental rig in testing equipment.Although existing unsaturation triaxial apparatus can be filled with gas into three axis samples,
It is that injecting hole is located on the contact surface of pedestal and sample, pressed gas often just passes through sample and latex before not entering into sample
It is escaped in the gap of membrane boundary, so as to cause being difficult to the accurate migration with quantitatively research pressed gas in rock soil medium and invading
Enter behavior.If directly reequiping the specimen mount of existing triaxial test instrument, original understructure can be not only destroyed, is influenced
Geotechnical centrifuge model operation, and installation and removal are also very complicated, are unfavorable for the development of three axis gas injection experimental studies.
Summary of the invention
Place in view of the shortcomings of the prior art, the purpose of the present invention is to provide a kind of three axis of geotechnique of fast assembling-disassembling
Gas injection experimental rig and method can not change the specimen mount structure of existing ordinary triaxial test equipment, directly be sleeved on original
Have on the pedestal of normal triaxial, the quantification Study on Triaxial Tests that gas is migrated and invaded in rock soil medium can be completed.This
Invention has many advantages, such as the advantages of structure is simple, installation and removal are quick, does not influence original ordinary triaxial test device structure, energy
Enough realize the free switching between ordinary triaxial test and gas injection test.
The purpose of the invention is achieved by the following technical solution:
A kind of three axis gas injection experimental rig of geotechnique of fast assembling-disassembling, including pedestal, top cap and latex film, the base top
Central protuberance is equipped with first boss, and the lower part permeable stone of circular ring shape is fitted with outside the first boss of the pedestal, described
First boss center is equipped with gas injection needle, and the pedestal side section is not connected with external air injection pipe and external water injection pipe, the bottom
Seat is internal to be equipped with connection water pipe and connectivity trachea, and the water inlet end of the connection water pipe is connected with external water injection pipe, the connection
The water outlet of water pipe is placed in lower part permeable stone bottom, and the inlet end of the connectivity trachea is connected with external air injection pipe, the company
The outlet side of snorkel is connected with gas injection needle；Top cap bottom centre protrusion is equipped with second boss, outside the second boss
Portion is fitted with the top permeable stone of circular ring shape, and the top cap side is connected with back-pressure pipe, is equipped with back-pressure inside the top cap
Communicating pipe, the input end of the back-pressure communicating pipe are placed at the top of the permeable stone of top, the outlet end of the back-pressure communicating pipe and back-pressure
Pipe is connected；Latex film is connected between the top cap and pedestal, the latex film internal sleeve is equipped with soil sample, the latex film top
Portion is packaged in top cap bottom outside by zero type sealing ring, which plays close between top cap bottom at the top of latex film
The effect of envelope；The latex film bottom is packaged on the outside of base top by zero type sealing ring, which plays latex
The effect sealed between film bottom and base top.Currently preferred zero type sealing ring is fabricated by rubber material.This hair
Zero bright type sealing ring is technology contents known to the art public, be a kind of section is circular rubber ring, because of it
Section is zero type, therefore is called zero type sealing ring, is mainly used between mechanical part preventing the leakage of liquids and gases medium,
The dynamic sealing element of axially reciprocating and low-speed rotation can also be used as simultaneously；Zero type sealing ring is properly termed as circle again
Sealing ring plays sealing function between two components.
In order to which the present invention is better achieved, it is recessed that base top recess on the outside of first boss is equipped with a circle pedestal
The notch end of slot, the base groove is corresponding with lower part permeable stone bottom, the connection water pipe with base groove is closed is connected to；
Top cap bottom recess on the outside of second boss is equipped with a circle top cap groove, and the notch end and top of the top cap groove are saturating
Corresponding at the top of water stone, the back-pressure communicating pipe is connected to top cap groove sealing.
Preferably, the gas injection needle includes the gas injection needle tubing for connecting tube socket A and being plugged in connection tube socket A, the note
Air tube tube top portion is placed in inside latex film, and the first boss center is provided with threaded hole, and the connection lower part tube socket A is external screw thread
The external thread column A of column A, the connection tube socket A are threadedly connected in the threaded hole of first boss, the gas injection needle tubing be connected to gas
Manage closed connection.
Preferably, the pedestal side is provided with gas injection threaded hole the invention also includes connection tube socket B and connection tube socket C
With water filling threaded hole, there is the connection tube socket B external thread column B, the external thread column B of the connection tube socket B to be threadedly connected to bottom
In the gas injection threaded hole of seat, there is the connection tube socket C external thread column C, the external thread column C of the connection tube socket C to be threadedly coupled
In the water filling threaded hole of pedestal；There is the pipeline A of connection corresponding with connectivity trachea inside the connection tube socket B, it is described external
In the closed pipeline A for being plugged in connection tube socket B of gas injection tube end；There is connect corresponding with connection water pipe inside the connection tube socket C
In logical pipeline B, the external closed pipeline B for being plugged in connection tube socket C of water filling tube end.
Preferably, the top cap side is provided with back-pressure threaded hole, the connecting tube the invention also includes connection tube socket D
There is seat D external thread column D, the external thread column D of the connection tube socket D to be threadedly connected in the back-pressure threaded hole of top cap, the company
There is the pipeline C of connection corresponding with back-pressure communicating pipe, the back-pressure tube end is closed to be plugged in connection tube socket D inside stub (tube) D
Pipeline C in.
Preferably, the pedestal, first boss are in cylindrical shape, the internal diameter of the lower part permeable stone and first convex
The diameter of platform is equal, and the height of the lower part permeable stone is equal with the height of first boss, the outer diameter of the lower part permeable stone with
The diameter of pedestal is equal.
Preferably, the top cap, second boss are in cylindrical shape, the internal diameter of the top permeable stone and second convex
The diameter of platform is equal, and the height of the top permeable stone is equal with the height of second boss, the outer diameter of the top permeable stone with
The diameter of top cap is equal.
Preferably, the back-pressure communicating pipe is made of back-pressure general pipeline and two back-pressure branch pipes, all back-pressure branch pipes are divided equally
It is not connected with back-pressure general pipeline, it is different that the input end of all back-pressure branch pipes is respectively placed in the top cap inside grooves on the permeable stone of top
The back-pressure general pipeline of position, the back-pressure communicating pipe is connected with back-pressure pipe.
Preferably, the base bottom is equipped with cutting ferrule, the routine the invention also includes normal triaxial instrument specimen mount
Tight clamping fit is in cutting ferrule at the top of triaxial apparatus specimen mount.
A kind of three axis gas injection test method of geotechnique of fast assembling-disassembling, including geotechnological three axis gas injection experimental rigs, method step
It is rapid as follows:
A, select the Ottawa AFS50/70 normal sand as soil sample, the relative compaction control of soil sample is 50%, by latex
Film bottom is tightened with base top with zero type sealing ring, and is supported latex film with split cavity and fixed, currently preferred zero type
Sealing ring is fabricated by rubber material；
B, drying and processing is carried out to the soil sample that step A is obtained, soil sample is weighed according to relative compaction, by weighed soil sample
Divide five layers to fall into latex film through funnel, soil sample surface is struck off, whether measurement present level reaches requirement, when highly higher
When, split cavity side wall need to be tapped using rubber hammer, settle sand, until height reaches requirement；Then top cap is installed, by latex
Tightened with top cap bottom with zero type sealing ring at the top of film, be cased in this way latex film soil sample be just installed on top cap and pedestal it
Between；By earthwork triaxial apparatus pressure chamber to the confining pressure of 30kPa is applied on the outside of soil sample to hold soil sample, currently preferred zero type is close
Seal is fabricated by rubber material；
C, using the intrapore gas of carbon dioxide gas displacement soil sample, external air injection pipe is closed, external water injection pipe is passed through
It is passed through carbon dioxide gas, gas flows out after passing through soil sample from back-pressure pipe, and venting process is not less than 2 hours, and venting pressure is little
In the confining pressure for the soil sample being applied on latex film；
D, after the completion of ventilation, water flowing operation is carried out by external water injection pipe, water flows out after passing through soil sample from back-pressure pipe, external
The water that water injection pipe is passed through is no steam distillation water, and water flowing pressure is not more than the confining pressure for the soil sample being applied on latex film；To back-pressure pipe
After the water for flowing out twice of soil sample volume, stop water flowing operation；
E, back-pressure is saturated, and control effective confining pressure 150kPa is constant, applies back-pressure and confining pressure step by step, every to have increased level-one back-pressure
After confining pressure, after pore pressure is stablized, the changing value of back-pressure is recorded, and calculate B value, B=back-pressure changing value/confining pressure changing value, to B
After value is greater than 0.98, i.e., it is believed that soil sample is fully saturated；
F, control effective confining pressure 150kPa keep 2 hours it is constant sample is consolidated, consolidation style is using each to equipressure
Consolidation；
G, external water injection pipe is closed, external air injection pipe is opened and carries out gas injection operation, gas is injected from external air injection pipe, just
Beginning injection pressure is equal to the pore water pressure in soil sample, and gas injection pressure is incremented by step by step, and every grade of gas injecting time of control is identical, and sets
It sets back-pressure to remain unchanged, and the back-pressure, pore pressure and the air pressure that finally obtain gas injection test change over time figure.
The present invention compared with the prior art, have the following advantages that and the utility model has the advantages that
(1) the present invention provides a kind of three axis gas injection experimental rig of the geotechnique of fast assembling-disassembling, original routine three is not being dismantled
It is quickly reequiped in the case where axis instrument specimen mount, thus meet the needs of gas injection test, it, can using modular component
Different components is matched according to testing program requirement.
(2) present invention has many advantages, such as that structure is simple, installation and removal are quick, can be realized ordinary triaxial test and gas injection
Free switching between test.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the structural schematic diagram of pedestal of the present invention and water filling, gas injection；
Fig. 3 is the structural schematic diagram of lower part permeable stone of the present invention；
Fig. 4 is the A-A cross-sectional view of Fig. 3；
Fig. 5 is the structural schematic diagram of gas injection needle of the present invention；
Fig. 6 is that back-pressure, pore pressure and air pressure change over time figure in the embodiment of the present invention.
Wherein, title corresponding to the appended drawing reference in attached drawing are as follows:
1- pedestal, the lower part 2- permeable stone, 3- gas injection needle, 31- connection tube socket A, 32- gas injection needle tubing, the external note of 4-
Tracheae, the external water injection pipe of 41- connection tube socket B, 5-, 51- connection tube socket C, 6- top cap, 61- second boss, 7- conventional three
Axis instrument specimen mount, 8- soil sample, 9- latex film, 10- back-pressure pipe, 101- connection tube socket D, 11- first boss, 12- connect
Water service pipe, 13- connectivity trachea, 14- back-pressure communicating pipe, 15- cutting ferrule, the top 16- permeable stone, 17- base groove, 18-
Top cap groove.
Specific embodiment
The present invention is described in further detail below with reference to embodiment:
Embodiment
As shown in fig. 1~fig. 5, the three axis gas injection experimental rig of geotechnique of a kind of fast assembling-disassembling, including pedestal 1, top cap 6 and cream
Glue film 9,1 top center protrusion of pedestal are equipped with first boss 11, are fitted with circular ring shape outside the first boss 11 of pedestal 1
It is equal to place internal diameter, an outer diameter before installing lower part permeable stone 2 between lower part permeable stone 2 and pedestal 1 for lower part permeable stone 2
Equal to the annular filter paper of lower part permeable stone 2.The center of first boss 11 is equipped with gas injection needle 3, and 1 side of pedestal is connected separately with outer
Air injection pipe 4 and external water injection pipe 5 are connect, connection water pipe 12 and connectivity trachea 13 is equipped with inside pedestal 1, is connected to the water inlet end of water pipe 12
It is connected with external air injection pipe 4, the water outlet of connection water pipe 12 is placed in 2 bottom of lower part permeable stone, the inlet end of connectivity trachea 13
It is connected with external water injection pipe 5, the outlet side of connectivity trachea 13 is connected with gas injection needle 3；6 bottom centre's protrusion of top cap is equipped with the
Two boss 61 are fitted with the top permeable stone 16 of circular ring shape outside second boss 61, and 6 side of top cap is connected with back-pressure pipe
10, back-pressure communicating pipe 14 is equipped with inside top cap 6, the input end of back-pressure communicating pipe 14 is placed in 16 top of top permeable stone, and back-pressure connects
The outlet end of siphunculus 14 is connected with back-pressure pipe 10；It is connected with latex film 9 between top cap 6 and pedestal 1, is set with inside latex film 9
There is a soil sample 8,6 bottom outside of top cap is packaged in by zero type sealing ring at the top of the latex film 9,9 bottom of latex film passes through
Zero type sealing ring is packaged in 1 top outer of pedestal, and currently preferred zero type sealing ring is fabricated by rubber material.
Recess is equipped with a circle base groove 17 on the outside of first boss 11 at the top of pedestal 1 of the present invention, base groove 17
Notch end is corresponding with 2 bottom of lower part permeable stone, and connection water pipe 12 and base groove 17 is closed to be connected to (the present embodiment connection water pipe
The water outlet at 12 tops with base groove 17 is closed is connected to)；When external water injection pipe 5 carries out water flowing operation, external water injection pipe 5 is passed through
It crosses connection water pipe 12 to be input in base groove 17, water is uniformly distributed in 2 bottom of lower part permeable stone by base groove 17, is made in this way
It obtains water to enter in soil sample 8 uniformly through lower part permeable stone 2, base groove 17 can allow water uniformly through lower part permeable stone 2.Top
6 bottom of cap recess on the outside of second boss 61 is equipped with a circle top cap groove 18, and the notch end and top of top cap groove 18 are permeable
The top of stone 16 is corresponding, back-pressure communicating pipe 14 and top cap groove 18 be closed to be connected to (the present embodiment back-pressure communicating pipe 14 bottom into
Mouthful end with top cap groove 18 is closed is connected to)；When in soil sample 8 gas or water top cap groove 18 is input to by top permeable stone 16
In, gas or water are uniformly distributed and are input in back-pressure communicating pipe 14 by top cap groove 18.
As shown in figure 5, gas injection needle 3 includes connection tube socket A31 and is plugged in the gas injection needle tubing 32 connected in tube socket A31, this
The gas injection needle tubing 32 of invention has different standard caliber and length, and the gas injection needle 3 of different size can be matched according to experimental program
It is connected with pedestal 1, is placed at the top of gas injection needle tubing 32 inside latex film 9,11 center of first boss is provided with threaded hole, connects tube socket
The lower part A31 is external thread column A, and the external thread column A of connection tube socket A31 is threadedly connected in the threaded hole of first boss 11, gas injection
Needle tubing 32 with connectivity trachea 13 is closed is connected to.
As shown in Fig. 2, 1 side of pedestal is provided with gas injection screw thread the invention also includes connection tube socket B41 and connection tube socket C51
There is external thread column B, the external thread column B of connection tube socket B41 to be threadedly connected to pedestal 1 by hole and water filling threaded hole, connection tube socket B41
Gas injection threaded hole in, connection tube socket C51 have external thread column C, connection tube socket C51 external thread column C be threadedly connected to pedestal 1
Water filling threaded hole in；Connect the pipeline A inside tube socket B41 with connection corresponding with connectivity trachea 13, external 4 end of air injection pipe
In the closed pipeline A for being plugged in connection tube socket B41；Connect the pipeline inside tube socket C51 with connection corresponding with connection water pipe 12
In B, the closed pipeline B for being plugged in connection tube socket C51 in external 5 end of water injection pipe.
As shown in Figure 1,6 side of top cap is provided with back-pressure threaded hole the invention also includes connection tube socket D101, tube socket is connected
There is D101 external thread column D, the external thread column D of connection tube socket D101 to be threadedly connected in the back-pressure threaded hole of top cap 6, connecting tube
There is the pipeline C of connection corresponding with back-pressure communicating pipe 14,10 end of back-pressure pipe is closed to be plugged in connection tube socket inside seat D101
In the pipeline C of D101.
Currently preferred pedestal 1, first boss 11 are in cylindrical shape, the internal diameter of lower part permeable stone 2 and first convex
The diameter of platform 11 is equal, and the height of lower part permeable stone 2 is equal with the height of first boss 11, the outer diameter of lower part permeable stone 2 and bottom
The diameter of seat 1 is equal.
Currently preferred top cap 6, second boss 61 are in cylindrical shape, the internal diameter of top permeable stone 16 and second convex
The diameter of platform 61 is equal, and the height of top permeable stone 16 is equal with the height of second boss 61, the outer diameter of top permeable stone 16 with
The diameter of top cap 6 is equal.
As shown in Figure 1, back-pressure communicating pipe 14 is made of back-pressure general pipeline and two back-pressure branch pipes, all back-pressure branch pipes are distinguished
It is connected with back-pressure general pipeline, the input end of all back-pressure branch pipes is respectively placed in inside the top cap groove 18 on top permeable stone 16 not
The back-pressure general pipeline of same position, back-pressure communicating pipe 14 is connected with back-pressure pipe 10.
As shown in Figure 1,1 bottom of pedestal is equipped with cutting ferrule 15, routine three the invention also includes normal triaxial instrument specimen mount 7
7 top tight clamping fit of axis instrument specimen mount is in cutting ferrule 15.
As shown in Fig. 1~Fig. 6, the three axis gas injection test method of geotechnique of a kind of fast assembling-disassembling, it is characterised in that: including geotechnique
Three axis gas injection experimental rigs, method and step are as follows:
A, select the Ottawa AFS50/70 normal sand as soil sample 8, the relative compaction control of soil sample 8 is 50%, will be newborn
9 bottom of glue film is tightened at the top of pedestal 1 with zero type sealing ring, and is supported latex film 9 with split cavity and fixed, currently preferred
Zero type sealing ring is fabricated by rubber material；
B, drying and processing is carried out to the soil sample 8 that step A is obtained, soil sample 8 is weighed according to relative compaction, by weighed soil
Sample 8 divides five layers to fall into latex film 9 through funnel, and 8 surface of soil sample is struck off, and whether measurement present level reaches requirement, when height
When higher, split cavity side wall need to be tapped using rubber hammer, settle sand, until height reaches requirement；Then top cap 6 is installed,
9 top of latex film is tightened with 6 bottom of top cap with zero type sealing ring, the soil sample 8 equipped with latex film 9 is just installed on top cap 6 in this way
Between pedestal 1；By earthwork triaxial apparatus pressure chamber on the outside of soil sample 8 apply 30kPa confining pressure to hold soil sample 8, the present invention
Preferred zero type sealing ring is fabricated by rubber material；
C, using the intrapore gas of carbon dioxide gas displacement soil sample 8, external air injection pipe 4 is closed, external water filling is passed through
Pipe 5 is passed through carbon dioxide gas, and gas flows out after passing through soil sample 8 from back-pressure pipe 10, and venting process is not less than 2 hours, ventilation pressure
Power is not more than the confining pressure for the soil sample 8 being applied on latex film 9, and the venting pressure of the present embodiment uses 20kPa；
D, after the completion of ventilation, water flowing operation is carried out by external water injection pipe 5, water flows out after passing through soil sample 8 from back-pressure pipe 10,
The water that external water injection pipe 5 is passed through is no steam distillation water, and water flowing pressure is not more than the confining pressure for the soil sample 8 being applied on latex film 9, this
The water flowing pressure of embodiment uses 20kPa；After back-pressure pipe 10 flows out the water of twice of 8 volume of soil sample, stop water flowing operation；
E, back-pressure is saturated, and control effective confining pressure 150kPa is constant, applies back-pressure and confining pressure step by step, every to have increased level-one back-pressure
After confining pressure, after pore pressure is stablized, the changing value of back-pressure is recorded, and calculate B value, B=back-pressure changing value/confining pressure changing value, to B
After value is greater than 0.98, i.e., it is believed that soil sample 8 is fully saturated；
F, control effective confining pressure 150kPa keep 2 hours it is constant sample is consolidated, consolidation style is using each to equipressure
Consolidation；
G, external water injection pipe 5 is closed, external air injection pipe 4 is opened and carries out gas injection operation, gas is from external 4 note of air injection pipe
Enter, initial injection pressure is equal to the pore water pressure in soil sample 8, and gas injection pressure is incremented by step by step, controls every grade of gas injecting time phase
Together, it and back-pressure is set remains unchanged, and the back-pressure, pore pressure and the air pressure that finally obtain gas injection test change over time figure (such as Fig. 6 institute
Show).
Term used in the present invention be should be noted that merely to describing specific embodiment, and not intended to limit
According to the illustrative embodiments of the application.It is unless the context clearly indicates otherwise, otherwise singular if used herein
Form be also intended to include plural form, additionally, it should be understood that, when in the present specification use term "comprising" and/or
When " comprising ", existing characteristics, step, operation, device, component and/or their combination are indicated.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of three axis gas injection experimental rig of geotechnique of fast assembling-disassembling, it is characterised in that: including pedestal (1), top cap (6) and latex
Film (9), pedestal (1) the top center protrusion are equipped with first boss (11), match outside the first boss (11) of the pedestal (1)
The lower part permeable stone (2) for being equipped with circular ring shape is closed, first boss (11) center is equipped with gas injection needle (3), the pedestal (1)
Side is connected separately with external air injection pipe (4) and external water injection pipe (5), be equipped with inside the pedestal (1) connection water pipe (12) and
The water inlet end of connectivity trachea (13), connection water pipe (12) is connected with external water injection pipe (5), connection water pipe (12)
Water outlet is placed in lower part permeable stone (2) bottom, and the inlet end of the connectivity trachea (13) is connected with external air injection pipe (4), institute
The outlet side for stating connectivity trachea (13) is connected with gas injection needle (3)；Top cap (6) bottom centre's protrusion is equipped with second boss
(61), the top permeable stone (16) of circular ring shape, top cap (6) the side connection are fitted with outside the second boss (61)
Have back-pressure pipe (10), be equipped with back-pressure communicating pipe (14) inside the top cap (6), the input end of the back-pressure communicating pipe (14) is placed in
At the top of top permeable stone (16), the outlet end of the back-pressure communicating pipe (14) is connected with back-pressure pipe (10)；The top cap (6) with
It is connected between pedestal (1) latex film (9), is packaged in outside top cap (6) bottom at the top of the latex film (9) by zero type sealing ring
Side, latex film (9) bottom are packaged in pedestal (1) top outer by zero type sealing ring.
2. a kind of three axis gas injection experimental rig of geotechnique of fast assembling-disassembling described in accordance with the claim 1, it is characterised in that: described
Recess is equipped with circle base groove (17), the slot of the base groove (17) on the outside of first boss (11) at the top of pedestal (1)
Mouthful end is corresponding with lower part permeable stone (2) bottom, the connection water pipe (12) with base groove (17) is closed is connected to；The top cap
(6) bottom recess on the outside of second boss (61) is equipped with circle top cap groove (18), the notch end of the top cap groove (18)
It is corresponding at the top of top permeable stone (16), the back-pressure communicating pipe (14) with top cap groove (18) is closed is connected to.
3. a kind of three axis gas injection experimental rig of geotechnique of fast assembling-disassembling described in accordance with the claim 1, it is characterised in that: the note
Air tube (3) include connection tube socket A(31) and be plugged in connect tube socket A(31) in gas injection needle tubing (32), the first boss
(11) center is provided with threaded hole, the connection tube socket A(31) lower part be external thread column A, the connection tube socket A(31) external screw thread
Column A is threadedly connected in the threaded hole of first boss (11), the gas injection needle tubing (32) with connectivity trachea (13) is closed is connected to.
4. a kind of three axis gas injection experimental rig of geotechnique of fast assembling-disassembling described in accordance with the claim 1, it is characterised in that: further include
Connect tube socket B(41) and connection tube socket C(51), pedestal (1) side is provided with gas injection threaded hole and water filling threaded hole, the company
Stub (tube) B(41) with external thread column B, the connection tube socket B(41) external thread column B be threadedly connected to the gas injection of pedestal (1)
In threaded hole, the connection tube socket C(51) the external thread column C threaded connection with external thread column C, the connection tube socket C(51)
In the water filling threaded hole of pedestal (1)；The connection tube socket B(41) pipeline of the inside with connection corresponding with connectivity trachea (13)
A, external air injection pipe (4) end is closed to be plugged in connection tube socket B(41) pipeline A in；The connection tube socket C(51) it is internal
Pipeline B with connection corresponding with connection water pipe (12), external water injection pipe (5) end is closed to be plugged in connection tube socket C
(51) in pipeline B.
5. a kind of three axis gas injection experimental rig of geotechnique of fast assembling-disassembling described in accordance with the claim 1, it is characterised in that: further include
Connect tube socket D(101), top cap (6) side is provided with back-pressure threaded hole, the connection tube socket D(101) there is external thread column D,
The connection tube socket D(101) external thread column D be threadedly connected in the back-pressure threaded hole of top cap (6), the connection tube socket D
(101) the internal pipeline C with connection corresponding with back-pressure communicating pipe (14), back-pressure pipe (10) end is closed to be plugged in connection
Tube socket D(101) pipeline C in.
6. a kind of three axis gas injection experimental rig of geotechnique of fast assembling-disassembling described in accordance with the claim 1, it is characterised in that: the bottom
Seat (1), first boss (11) are in cylindrical shape, the internal diameter of the lower part permeable stone (2) and the diameter of first boss (11)
Equal, the height of the lower part permeable stone (2) is equal with the height of first boss (11), the outer diameter of the lower part permeable stone (2)
It is equal with the diameter of pedestal (1).
7. a kind of three axis gas injection experimental rig of geotechnique of fast assembling-disassembling described in accordance with the claim 1, it is characterised in that: the top
Cap (6), second boss (61) are in cylindrical shape, the internal diameter of the top permeable stone (16) and the diameter of second boss (61)
Equal, the height of the top permeable stone (16) is equal with the height of second boss (61), outside the top permeable stone (16)
Diameter is equal with the diameter of top cap (6).
8. the three axis gas injection experimental rig of geotechnique of a kind of fast assembling-disassembling according to claim 2, it is characterised in that: described anti-
Pressure communicating pipe (14) is made of back-pressure general pipeline and two back-pressure branch pipes, and all back-pressure branch pipes are connected with back-pressure general pipeline respectively,
The input end of all back-pressure branch pipes is respectively placed in the internal different location of the top cap groove (18) on top permeable stone (16), described anti-
The back-pressure general pipeline of pressure communicating pipe (14) is connected with back-pressure pipe (10).
9. a kind of three axis gas injection experimental rig of geotechnique of fast assembling-disassembling described in accordance with the claim 1, it is characterised in that: further include
Normal triaxial instrument specimen mount (7), pedestal (1) bottom are equipped with cutting ferrule (15), normal triaxial instrument specimen mount (7) top
Portion's tight clamping fit is in cutting ferrule (15).
10. a kind of three axis gas injection test method of geotechnique of fast assembling-disassembling, it is characterised in that: including geotechnological three axis gas injections test dress
It sets, method and step is as follows:
A, select the Ottawa AFS50/70 normal sand as soil sample (8), the relative compaction control of soil sample (8) is 50%, by latex
Film (9) bottom is tightened at the top of pedestal (1) with zero type sealing ring, and is supported latex film (9) with split cavity and fixed；
B, drying and processing is carried out to the soil sample (8) that step A is obtained, soil sample (8) is weighed according to relative compaction, by weighed soil
Five layers of sample (8) point fall into latex film (9) through funnel, and soil sample (8) surface is struck off, and whether measurement present level reaches requirement,
When highly higher, split cavity side wall need to be tapped using rubber hammer, settle sand, until height reaches requirement；Then it installs
Top cap (6) will be tightened with zero type sealing ring with top cap (6) bottom at the top of latex film (9), the soil sample of latex film (9) be housed in this way
(8) it is just installed between top cap (6) and pedestal (1)；By earthwork triaxial apparatus pressure chamber to application 30kPa on the outside of soil sample (8)
Confining pressure is to hold soil sample (8)；
C, using carbon dioxide gas displacement soil sample (8) intrapore gas, external air injection pipe (4) is closed, external water filling is passed through
Pipe (5) is passed through carbon dioxide gas, and gas flows out after passing through soil sample (8) from back-pressure pipe (10), and venting process is not less than 2 hours,
Venting pressure is not more than the confining pressure for the soil sample (8) being applied on latex film (9)；
D, after the completion of ventilation, water flowing operation is carried out by external water injection pipe (5), water flows after passing through soil sample (8) from back-pressure pipe (10)
Out, the water that external water injection pipe (5) is passed through is no steam distillation water, and water flowing pressure is not more than the soil sample (8) being applied on latex film (9)
Confining pressure；After back-pressure pipe (10) flow out the water of twice of soil sample (8) volume, stop water flowing operation；
E, back-pressure is saturated, and control effective confining pressure 150kPa is constant, applies back-pressure and confining pressure step by step, every to have increased level-one back-pressure and enclosed
After pressure, after pore pressure is stablized, the changing value of back-pressure is recorded, and calculate B value, B=back-pressure changing value/confining pressure changing value is big to B value
After 0.98, i.e., it is believed that soil sample (8) is fully saturated；
F, control effective confining pressure 150kPa keep 2 hours it is constant sample is consolidated, consolidation style is using each to isotonic consolidation；
G, external water injection pipe (5) is closed, external air injection pipe (4) is opened and carries out gas injection operation, gas is infused from external air injection pipe (4)
Enter, initial injection pressure is equal to the pore water pressure in soil sample (8), and gas injection pressure is incremented by step by step, controls every grade of gas injecting time
It is identical, and back-pressure is set and is remained unchanged, and the back-pressure, pore pressure and the air pressure that finally obtain gas injection test change over time figure.
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