CN109507084A - A kind of discrete material porosity intelligent recognition true triaxial experimental system and method - Google Patents
A kind of discrete material porosity intelligent recognition true triaxial experimental system and method Download PDFInfo
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- CN109507084A CN109507084A CN201811610620.1A CN201811610620A CN109507084A CN 109507084 A CN109507084 A CN 109507084A CN 201811610620 A CN201811610620 A CN 201811610620A CN 109507084 A CN109507084 A CN 109507084A
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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
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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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
Abstract
A kind of discrete material porosity intelligent recognition true triaxial experimental system and method, system include main frame, pressure chamber, first axle pressure charging assembly, the second axis pressure charging assembly, the first mechanical confining pressure charging assembly, the second mechanical confining pressure charging assembly, liquid confining pressure charging assembly, discrete material sample hole pressure-loaded component, computer and CCD camera.Method are as follows: first discrete material sample is installed in pressure chamber, then is filled the water to pressure chamber, confining pressure load is carried out after water filling, then carries out pore pressure load, finally carries out mechanical confining pressure load and axis pressure load；Through the transparent tank wall of pressure chamber, Image Acquisition is carried out to discrete material sample by CCD camera, binary conversion treatment is carried out to acquired image by computer, the area of treated picture black part and white portion is counted again, the porosity change process of discrete material sample during the experiment is analyzed, realizes and intelligent recognition is carried out to porosity change during discrete material sample is loaded.
Description
Technical field
The invention belongs to civil engineering test technical fields, true more particularly to a kind of discrete material porosity intelligent recognition
Triaxial tests system and method.
Background technique
The intensity of discrete material is influenced by many factors, and play a crucial role be discrete material mineral grain friction
The structure feature of characteristic and its aggregate；Friction is the substantive characteristics of particulate mineral, has both included the sliding friction between particle,
Including intergranular occlusion and rolling friction；Aggregated structure can usually be characterized with anisotropic degree, but since the soil body is heavy
The influence of product history or loading environment, the soil body is often with there is anisotropy, and anisotropy is generally divided into two kinds, the first is primary
Anisotropy, second is Induced Anisotropy；Formed during soil body deposition, in the deposition process grain composition and
Particle preferred arrangement direction difference, particle attaching space difference and pore shape, size variation that shape difference generates etc., this
Kind property is known as inherent anisotropy；It is formed in soil body loading procedure, due to the influence of imposed load, discrete material is moulded in bullet
Property deformation process in particle contact separation, sliding, particle rotation recombination it is even broken, so that the primary fabric of discrete material be made to send out
Changing, and then the mechanical behavior of discrete material is influenced, this property is known as Induced Anisotropy；Therefore, discrete material by
Porosity change during load is an important indicator of discrete material research.
But be directed at present three axis loading experiment systems of discrete material mainly both for traditional parametric measurement into
Row design, and have ignored the identification of porosity during the experiment.Therefore, it designs a set of for discrete material porosity intelligence
The true triaxial experimental system and method for identification are very necessary.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of discrete material porosity intelligent recognition true triaxial experiment
System and method introduces image processing techniques, and high-precision true triaxial load, and true three can be carried out to discrete material sample
Axis is loaded as the mode that hydraulic pressure is combined with mechanical pressurization, and can be during discrete material sample is loaded to porosity change
Carry out intelligent recognition.
To achieve the goals above, the present invention adopts the following technical scheme: a kind of discrete material porosity intelligent recognition is true
Triaxial tests system, including main frame, pressure chamber, first axle pressure charging assembly, the second axis pressure charging assembly, the first mechanical confining pressure
Charging assembly, the second mechanical confining pressure charging assembly, liquid confining pressure charging assembly, discrete material sample hole pressure-loaded component,
Computer and CCD camera；The pressure chamber is packed in main frame by pressure chamber's support frame；The first axle presses charging assembly
It is arranged on the main frame top beam above pressure chamber；The main frame bottom below pressure chamber is arranged in the second axis pressure charging assembly
On plate；Described first mechanical confining pressure charging assembly is arranged on the main frame column on the left of pressure chamber；Described second mechanical confining pressure
Charging assembly is arranged on the main frame column on the right side of pressure chamber；The liquid confining pressure charging assembly, discrete material sample hole
Pressure-loaded component and computer are arranged inside main frame；The CCD camera is located at outside main frame.
The pressure chamber uses square structure, is equipped with detachable capping, detachable capping and pressure at the top of pressure chamber
It is connected by screw bolts between chamber body, installs seal washer additional between detachable capping and the contact surface of pressure chamber's cabinet；Institute
The face tank wall for stating pressure chamber is set as transparent tank wall, other three faces tank walls are opaque tank wall；The CCD camera and pressure chamber
The setting of transparent tank wall face, and the camera lens of CCD camera is towards transparent tank wall；The wherein impermeable camera-lucida of one side in the pressure chamber
Water injection hole, the external Water filling valve of water injection hole are offered on wall, water injection hole is connected by Water filling valve with water source.
The first axle pressure charging assembly includes axis pressure load jack, axis pressure load bar and first axle pressure load plate；Institute
It states axis pressure load jack to be packed in vertically on main frame top beam, and the piston rod of axis pressure load jack is downward；The axis pressure
The detachable capping of load bar hermetically passing, axis press load bar upper end to press the piston rod end of load jack to be fixedly connected with axis,
Axis pressure load bar lower end is located inside pressure chamber；First axle pressure load plate level is packed in axis pressure load bar lower end, and first
Axis pressure load plate lower surface is in contact with discrete material sample.
The second axis pressure charging assembly includes axis pressure load cylinder and the second axis pressure load plate；The axis pressure load cylinder is vertical
It is packed on main frame bottom plate, the piston rod packing of axis pressure load cylinder passes through pressure chamber's bottom plate, the tailpiece of the piston rod of axis pressure load cylinder
Portion is located inside pressure chamber；The second axis pressure load plate level is packed in the piston rod end of axis pressure load cylinder, the second axis pressure
Load plate lower surface is in contact with discrete material sample.
The discrete material sample hole pressure-loaded component includes pore pressure controller, pore pressure switch valve and hole
Gap pressure transmission pipe；It presses the piston rod inner of load cylinder to offer pore pressure conduction pathway in the axis, adds in the second axis pressure
Pore pressure conduction hole is offered on support plate；The external hole pressure switch of the pore pressure delivery outlet of the pore pressure controller
Valve；The arrival end of the pore pressure conduction pathway is connected by hole pressure transmission pipe with pore pressure switch valve, Pore Pressure
The outlet end of power conduction pathway is connected with pore pressure conduction hole, and pore pressure conduction hole is communicated with discrete material sample.
The first mechanical confining pressure charging assembly includes the first mechanical confining pressure controller, the first mechanical confining pressure load bar and the
One mechanical confining pressure load plate；Described first mechanical confining pressure controller level is packed on main frame column；First machinery encloses
Press the opaque tank wall of load bar hermetically passing pressure chamber, the first mechanical confining pressure load bar outer end and the first mechanical confining pressure controller
Piston rod end be fixedly connected with, the first mechanical confining pressure load bar inner end is located inside pressure chamber；Described first mechanical confining pressure load
Plate is packed in the first mechanical confining pressure load bar inner end, the inner surface and discrete material sample of the first mechanical confining pressure load plate vertically
It is in contact.
The second mechanical confining pressure charging assembly includes the second mechanical confining pressure controller, the second mechanical confining pressure load bar and the
Two mechanical confining pressure load plates；Described second mechanical confining pressure controller level is packed on main frame column；Second machinery encloses
Press the opaque tank wall of load bar hermetically passing pressure chamber, the second mechanical confining pressure load bar outer end and the second mechanical confining pressure controller
Piston rod end be fixedly connected with, the second mechanical confining pressure load bar inner end is located inside pressure chamber；Described second mechanical confining pressure load
Plate is packed in the second mechanical confining pressure load bar inner end, the inner surface and discrete material sample of the second mechanical confining pressure load plate vertically
It is in contact.
The liquid confining pressure charging assembly includes liquid confining pressure controller, confining pressure switch valve, confining pressure conducting tube and manual three
Position three-way valve；The external confining pressure switch valve of the confining pressure delivery outlet of the liquid confining pressure controller；It is opened in the detachable capping
Equipped with confining pressure loading hole, the external manual three-position three-way valve of confining pressure loading hole leads between manual three-position three-way valve and confining pressure switch valve
It crosses confining pressure conducting tube to be connected, exhaust outlet is equipped on manual three-position three-way valve.
Described first mechanical confining pressure load plate is identical with the second mechanical confining pressure load plate structure, is all made of double-layer structure, adds
The internal layer of support plate is AND DEWATERING FOR ORIFICE STRUCTURE, and the outer layer of load plate is solid slab structure, the internal layer orifice plate and discrete material sample of load plate
It is in contact, the internal layer orifice plate of load plate is as confining pressure conductive medium.
A kind of discrete material porosity intelligent recognition true triaxial experimental method, using the discrete material porosity intelligence
It can identify true triaxial experimental system, include the following steps:
Step 1: it first will connect detachable capping and the bolt of pressure chamber's cabinet unload, then control shaft pressure load thousand
The piston rod retraction on jin top, until detachable capping and first axle pressure load plate are lifted away from pressure chamber；
Step 2: the discrete material sample prepared is placed into the second axis pressure load plate upper surface, granular media material at this time
Material sample is finished by heat shrinkage film package；
Step 3: controlling the first mechanical confining pressure controller and the second mechanical confining pressure controller action by computer, until
First mechanical confining pressure load plate and the second mechanical confining pressure load plate with discrete material sample contacts；
Step 4: the piston rod of control shaft pressure load jack stretches out, until detachable capping falls back to pressure again
On chamber body, then the bolt unloaded is all reinstalled；
Step 5: the piston rod for continuing control shaft pressure load jack stretches out, until first axle pressure load plate and granular media material
Expect sample contacts；
Step 6: manual three-position three-way valve is first adjusted to exhaust gear, Water filling valve is then turned on, starts to pressure chamber
Middle water filling, in the injecting process, the air in pressure chamber directly passes through manual three-position three-way valve and is discharged, when manual three-position three-way valve is opened
After there is water discharge in beginning, Water filling valve is closed, pressure chamber completes water filling；
Step 7: manual three-position three-way valve is adjusted to confining pressure load gear, is then turned on confining pressure switch valve, then pass through meter
Calculation machine controls liquid confining pressure controller action, starts to carry out confining pressure load to discrete material sample, until confining pressure reaches setting value；
Step 8: first opening hole pressure opening and closing valve, then controls the movement of hole pressure controller by computer, starts
Pore pressure load is carried out to discrete material sample, until pore pressure reaches setting value；
Step 9: by the mechanical confining pressure controller of computer control first and the second mechanical confining pressure controller action, to scattered
Body material sample carries out mechanical confining pressure load, until mechanical confining pressure reaches setting value；Meanwhile it being pressed and being loaded by computer control shaft
Jack and axis pressure load cylinder movement, carry out axis pressure load to discrete material sample, until axis pressure reaches setting value；
Step 10: through the transparent tank wall of pressure chamber, carrying out Image Acquisition to discrete material sample by CCD camera,
The opaque tank wall of middle pressure chamber is as image background, for distinguishing the profile of discrete material sample and pressure chamber；Then pass through
Computer carries out binary conversion treatment to acquired image, and black portions therein are the entity part of discrete material sample, and
White portion is the hole of discrete material sample；The area of black portions and white portion is counted again, can be analyzed scattered
The porosity change process of body material sample during the experiment.
Beneficial effects of the present invention:
Discrete material porosity intelligent recognition true triaxial experimental system of the invention and method, introduce image procossing skill
Art can carry out high-precision true triaxial load to discrete material sample, and true triaxial is loaded as hydraulic pressure and mutually ties with mechanical pressurization
The mode of conjunction, and intelligent recognition can be carried out to porosity change during discrete material sample is loaded；The present invention also has
The feature that structure is simple, easy to operate, experimental precision is high, experiment accuracy is high, safe and reliable and low in cost.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of discrete material porosity intelligent recognition true triaxial experimental system of the invention；
Fig. 2 is the structural schematic diagram of pressure chamber of the invention；
In figure, 1-main frame, 2-pressure chambers, 3-pressure chamber's support frames, 4-detachable cappings, 5-transparent tank walls,
6-opaque tank walls, 7-Water filling valves, 8-axis pressure load jack, 9-axis press load bar, and 10-first axles press load plate,
11-discrete material samples, 12-axis pressure load cylinder, the 13-the second axis press load plate, 14-pore pressure controllers, 15-holes
Gap pressure opening and closing valve, 16-pore pressure conducting tubes, 17-pore pressure conduction pathways, 18-pore pressures conduction hole, 19-
First mechanical confining pressure controller, the 20-the first mechanical confining pressure load bar, the 21-the first mechanical confining pressure load plate, 22-the second is mechanical
Confining pressure controller, the 23-the second mechanical confining pressure load bar, the 24-the second mechanical confining pressure load plate, 25-liquid confining pressure controllers,
26-confining pressure switch valves, 27-confining pressure conducting tubes, 28-manual three-position three-way valves, 29-computers.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, 2, a kind of discrete material porosity intelligent recognition true triaxial experimental system, including main frame 1, pressure
Room 2, first axle pressure charging assembly, the second axis pressure charging assembly, the first mechanical confining pressure charging assembly, the second mechanical confining pressure load group
Part, liquid confining pressure charging assembly, discrete material sample hole pressure-loaded component, computer and CCD camera；The pressure chamber 2
It is packed in main frame 1 by pressure chamber's support frame 3；The main frame of 2 top of pressure chamber is arranged in the first axle pressure charging assembly
On 1 top beam of frame；The second axis pressure charging assembly is arranged on 1 bottom plate of main frame below pressure chamber 2；First machinery encloses
Pressure charging assembly is arranged on 1 column of main frame in 2 left side of pressure chamber；Described second mechanical confining pressure charging assembly is arranged in pressure
On 1 column of main frame on 2 right side of room；The liquid confining pressure charging assembly, discrete material sample hole pressure-loaded component and meter
Calculation machine 29 is arranged inside main frame 1；The CCD camera is located at outside main frame 1.
The pressure chamber 2 uses square structure, is equipped with detachable capping 4 at the top of pressure chamber 2, detachable capping 4 with
It is connected by screw bolts between 2 cabinet of pressure chamber, installs additional and seal between detachable capping 4 and the contact surface of 2 cabinet of pressure chamber
Washer；One face tank wall of the pressure chamber 2 is set as transparent tank wall 5, other three faces tank walls are opaque tank wall 6；The CCD phase
5 face of transparent tank wall of machine and pressure chamber 2 is arranged, and the camera lens of CCD camera is towards transparent tank wall 5；In its of the pressure chamber 2
Water injection hole, the external Water filling valve 7 of water injection hole are offered on the middle opaque tank wall 6 of one side, water injection hole passes through Water filling valve 7 and water source
It is connected.
The first axle pressure charging assembly includes axis pressure load jack 8, axis pressure load bar 9 and first axle pressure load plate
10；The axis pressure load jack 8 is packed in vertically on 1 top beam of main frame, and the piston rod of axis pressure load jack 8 is downward；
The detachable capping 4 of axis pressure 9 hermetically passing of load bar, axis press the piston rod of 9 upper end of load bar and axis pressure load jack 8
End is fixedly connected with, and axis pressure 9 lower end of load bar is located inside pressure chamber 2；First axle pressure 10 level of load plate is packed in axis pressure
9 lower end of load bar, first axle pressure 10 lower surface of load plate are in contact with discrete material sample 11.
The second axis pressure charging assembly includes axis pressure load cylinder 12 and the second axis pressure load plate 13；The axis pressure load cylinder
12 are packed on 1 bottom plate of main frame vertically, and the piston rod packing of axis pressure load cylinder 12 passes through 2 bottom plate of pressure chamber, axis pressure load cylinder
12 piston rod end is located inside pressure chamber 2；Second axis pressure, 13 level of load plate is packed in the work of axis pressure load cylinder 12
Stopper rod end, the second axis pressure 13 lower surface of load plate are in contact with discrete material sample 11.
The discrete material sample hole pressure-loaded component includes pore pressure controller 14, pore pressure switch valve 15
And pore pressure conducting tube 16；The piston rod inner of load cylinder 12 is pressed to offer pore pressure conduction pathway 17 in the axis,
Pore pressure conduction hole 18 is offered in second axis pressure load plate 13；The pore pressure delivery outlet of the pore pressure controller 14
External hole pressure opening and closing valve 15；The arrival end of the pore pressure conduction pathway 17 passes through hole pressure transmission pipe 16 and hole
Pressure opening and closing valve 15 is connected, and the outlet end of pore pressure conduction pathway 17 is connected with pore pressure conduction hole 18, pore pressure
Conduction hole 18 is communicated with discrete material sample 11.
Described first mechanical confining pressure charging assembly includes the first mechanical confining pressure load bar 20 of mechanical confining pressure controller 19, first
And the first mechanical confining pressure load plate 21；Described first mechanical 19 level of confining pressure controller is packed on 1 column of main frame；Described
The opaque tank wall 6 of one mechanical 20 hermetically passing pressure chamber 2 of confining pressure load bar, the first mechanical 20 outer end of confining pressure load bar and first
The piston rod end of mechanical confining pressure controller 19 is fixedly connected with, and the first mechanical 20 inner end of confining pressure load bar is located inside pressure chamber 2；Institute
It states the first mechanical confining pressure load plate 21 and is packed in the first mechanical 20 inner end of confining pressure load bar, the first mechanical confining pressure load plate 21 vertically
Inner surface be in contact with discrete material sample 11.
Described second mechanical confining pressure charging assembly includes the second mechanical confining pressure load bar 23 of mechanical confining pressure controller 22, second
And the second mechanical confining pressure load plate 24；Described second mechanical 22 level of confining pressure controller is packed on 1 column of main frame；Described
The opaque tank wall 6 of two mechanical 23 hermetically passing pressure chambers 2 of confining pressure load bar, the second mechanical 23 outer end of confining pressure load bar and second
The piston rod end of mechanical confining pressure controller 22 is fixedly connected with, and the second mechanical 23 inner end of confining pressure load bar is located inside pressure chamber 2；Institute
It states the second mechanical confining pressure load plate 24 and is packed in the second mechanical 23 inner end of confining pressure load bar, the second mechanical confining pressure load plate 24 vertically
Inner surface be in contact with discrete material sample 11.
The liquid confining pressure charging assembly include liquid confining pressure controller 25, confining pressure switch valve 26, confining pressure conducting tube 27 and
Manual three-position three-way valve 28；The external confining pressure switch valve 26 of confining pressure delivery outlet of the liquid confining pressure controller 25；Described removable
Unload and offer confining pressure loading hole in formula capping 4, the external manual three-position three-way valve 28 of confining pressure loading hole, manual three-position three-way valve 28 with
It is connected between confining pressure switch valve 26 by confining pressure conducting tube 27, exhaust outlet is equipped on manual three-position three-way valve 28.
Described first mechanical confining pressure load plate 21 is identical with the second mechanical confining pressure 24 structures of load plate, is all made of the double-deck knot
Structure, the internal layer of load plate are AND DEWATERING FOR ORIFICE STRUCTURE, and the outer layer of load plate is solid slab structure, the internal layer orifice plate and discrete material of load plate
Sample 11 is in contact, and the internal layer orifice plate of load plate is as confining pressure conductive medium.
In the present embodiment, pore pressure controller 14 and liquid confining pressure controller 25 are all made of model STDDPCv2's
GDS normal pressure/fixing fabric structure device；Described first mechanical confining pressure controller 19 and the second mechanical confining pressure controller 22 are all made of type
Number be YAW-10000 microcomputer controlled electro-hydraulic servo press machine.
A kind of discrete material porosity intelligent recognition true triaxial experimental method, using the discrete material porosity intelligence
It can identify true triaxial experimental system, include the following steps:
Step 1: it first will connect detachable capping 4 and the bolt of 2 cabinet of pressure chamber unload, then the load of control shaft pressure
The piston rod of jack 8 bounces back, until detachable capping 4 and first axle pressure load plate 10 are lifted away from pressure chamber 2；
Step 2: by the discrete material sample 11 prepared be placed into the second axis pressure 13 upper surface of load plate, at this time dissipate
Body material sample 11 is finished by heat shrinkage film package；
Step 3: dynamic by the mechanical confining pressure controller 19 of the control of computer 29 first and the second mechanical confining pressure controller 22
Make, until the first mechanical confining pressure load plate 21 and the second mechanical confining pressure load plate 24 are contacted with discrete material sample 11；
Step 4: the piston rod of control shaft pressure load jack 8 stretches out, until detachable capping 4 falls back to pressure again
On 2 cabinet of power room, then the bolt unloaded is all reinstalled；
Step 5: the piston rod for continuing control shaft pressure load jack 8 stretches out, until first axle presses load plate 10 and granular media
Material sample 11 contacts；
Step 6: manual three-position three-way valve 28 is first adjusted to exhaust gear, Water filling valve 7 is then turned on, starts to pressure
It is filled the water in power room 2, in the injecting process, the air in pressure chamber 2 directly passes through manual three-position three-way valve 28 and is discharged, when manual three
After triple valve 28 begins with water discharge, Water filling valve 7 is closed, pressure chamber 2 completes water filling；
Step 7: manual three-position three-way valve 28 is adjusted to confining pressure load gear, is then turned on confining pressure switch valve 26, then lead to
It crosses computer 29 and controls the movement of liquid confining pressure controller 25, start to carry out confining pressure load to discrete material sample 11, until confining pressure
Reach setting value；
Step 8: first opening hole pressure opening and closing valve 15, and it is dynamic then to control hole pressure controller 14 by computer 29
Make, starts to carry out pore pressure load to discrete material sample 11, until pore pressure reaches setting value；
Step 9: dynamic by the mechanical confining pressure controller 19 of the control of computer 29 first and the second mechanical confining pressure controller 22
Make, mechanical confining pressure load is carried out to discrete material sample 11, until mechanical confining pressure reaches setting value；Meanwhile passing through computer 29
Control shaft pressure load jack 8 and axis pressure load cylinder 12 act, and axis pressure load are carried out to discrete material sample 11, until axis pressure reaches
To setting value；
Step 10: through the transparent tank wall 5 of pressure chamber 2, image is carried out to discrete material sample 11 by CCD camera and is adopted
Collection, wherein the opaque tank wall 6 of pressure chamber 2 is used as image background, for distinguishing the wheel of discrete material sample 11 Yu pressure chamber 2
It is wide；Then binary conversion treatment is carried out to acquired image by computer 29, black portions therein are discrete material sample
11 entity part, and white portion is the hole of discrete material sample 11；Again to the areas of black portions and white portion into
Row statistics, can analyze the porosity change process of discrete material sample 11 during the experiment.
The scope of patent protection that scheme in embodiment is not intended to limit the invention, it is all without departing from carried out by the present invention etc.
Effect implements or change, is both contained in the scope of the patents of this case.
Claims (10)
1. a kind of discrete material porosity intelligent recognition true triaxial experimental system, it is characterised in that: including main frame, pressure chamber,
First axle press charging assembly, the second axis pressure charging assembly, the first mechanical confining pressure charging assembly, the second mechanical confining pressure charging assembly,
Liquid confining pressure charging assembly, discrete material sample hole pressure-loaded component, computer and CCD camera；The pressure chamber passes through
Pressure chamber's support frame is packed in main frame；The main frame top beam above pressure chamber is arranged in the first axle pressure charging assembly
On；The second axis pressure charging assembly is arranged on the main frame bottom plate below pressure chamber；Described first mechanical confining pressure load group
Part is arranged on the main frame column on the left of pressure chamber；The master on the right side of pressure chamber is arranged in described second mechanical confining pressure charging assembly
On upright of frame；The liquid confining pressure charging assembly, discrete material sample hole pressure-loaded component and computer are arranged at
Inside main frame；The CCD camera is located at outside main frame.
2. a kind of discrete material porosity intelligent recognition true triaxial experimental system according to claim 1, it is characterised in that:
The pressure chamber uses square structure, is equipped with detachable capping at the top of pressure chamber, detachable capping and pressure chamber's cabinet it
Between be connected by screw bolts, it is detachable capping the contact surface of pressure chamber's cabinet between install seal washer additional；The pressure chamber
A face tank wall be set as transparent tank wall, other three faces tank walls are opaque tank wall；The glass box of the CCD camera and pressure chamber
The setting of wall face, and the camera lens of CCD camera is towards transparent tank wall；It is opened up on the opaque tank wall of wherein one side of the pressure chamber
There are water injection hole, the external Water filling valve of water injection hole, water injection hole is connected by Water filling valve with water source.
3. a kind of discrete material porosity intelligent recognition true triaxial experimental system according to claim 2, it is characterised in that:
The first axle pressure charging assembly includes axis pressure load jack, axis pressure load bar and first axle pressure load plate；The axis pressure adds
It carries jack to be packed in vertically on main frame top beam, and the piston rod of axis pressure load jack is downward；The axis pressure load bar is close
For envelope across detachable capping, axis presses load bar upper end to press the piston rod end of load jack to be fixedly connected with axis, axis pressure load
Bar lower end is located inside pressure chamber；The first axle pressure load plate level is packed in axis pressure load bar lower end, first axle pressure load
Plate lower surface is in contact with discrete material sample.
4. a kind of discrete material porosity intelligent recognition true triaxial experimental system according to claim 1, it is characterised in that:
The second axis pressure charging assembly includes axis pressure load cylinder and the second axis pressure load plate；The axis pressure load cylinder is packed in master vertically
On chassis base, the piston rod packing of axis pressure load cylinder passes through pressure chamber's bottom plate, and the piston rod end of axis pressure load cylinder is located at pressure
Power chamber interior；The second axis pressure load plate level is packed in the piston rod end of axis pressure load cylinder, and the second axis is pressed under load plate
Surface is in contact with discrete material sample.
5. a kind of discrete material porosity intelligent recognition true triaxial experimental system according to claim 4, it is characterised in that:
The discrete material sample hole pressure-loaded component includes that pore pressure controller, pore pressure switch valve and pore pressure pass
Conduit；It presses the piston rod inner of load cylinder to offer pore pressure conduction pathway in the axis, is opened in the second axis pressure load plate
Hole is conducted equipped with pore pressure；The external hole pressure opening and closing valve of the pore pressure delivery outlet of the pore pressure controller；It is described
The arrival end of pore pressure conduction pathway is connected by hole pressure transmission pipe with pore pressure switch valve, and pore pressure conduction is logical
The outlet end in road is connected with pore pressure conduction hole, and pore pressure conduction hole is communicated with discrete material sample.
6. a kind of discrete material porosity intelligent recognition true triaxial experimental system according to claim 2, it is characterised in that:
Described first mechanical confining pressure charging assembly includes that the first mechanical confining pressure controller, the first mechanical confining pressure load bar and the first machinery enclose
Press load plate；Described first mechanical confining pressure controller level is packed on main frame column；Described first mechanical confining pressure load bar
The opaque tank wall of hermetically passing pressure chamber, the piston rod of the first mechanical confining pressure load bar outer end and the first mechanical confining pressure controller
End is fixedly connected with, and the first mechanical confining pressure load bar inner end is located inside pressure chamber；Described first mechanical confining pressure load plate is solid vertically
Mounted in the first mechanical confining pressure load bar inner end, the inner surface of the first mechanical confining pressure load plate is in contact with discrete material sample.
7. a kind of discrete material porosity intelligent recognition true triaxial experimental system according to claim 6, it is characterised in that:
Described second mechanical confining pressure charging assembly includes that the second mechanical confining pressure controller, the second mechanical confining pressure load bar and the second machinery enclose
Press load plate；Described second mechanical confining pressure controller level is packed on main frame column；Described second mechanical confining pressure load bar
The opaque tank wall of hermetically passing pressure chamber, the piston rod of the second mechanical confining pressure load bar outer end and the second mechanical confining pressure controller
End is fixedly connected with, and the second mechanical confining pressure load bar inner end is located inside pressure chamber；Described second mechanical confining pressure load plate is solid vertically
Mounted in the second mechanical confining pressure load bar inner end, the inner surface of the second mechanical confining pressure load plate is in contact with discrete material sample.
8. a kind of discrete material porosity intelligent recognition true triaxial experimental system according to claim 2, it is characterised in that:
The liquid confining pressure charging assembly includes liquid confining pressure controller, confining pressure switch valve, confining pressure conducting tube and manual three-position three-way valve；
The external confining pressure switch valve of the confining pressure delivery outlet of the liquid confining pressure controller；Confining pressure is offered in the detachable capping to add
Hole is carried, the external manual three-position three-way valve of confining pressure loading hole is conducted between manual three-position three-way valve and confining pressure switch valve by confining pressure
Pipe is connected, and exhaust outlet is equipped on manual three-position three-way valve.
9. a kind of discrete material porosity intelligent recognition true triaxial experimental system according to claim 7, it is characterised in that:
The first mechanical confining pressure load plate is identical with the second mechanical confining pressure load plate structure, is all made of double-layer structure, load plate it is interior
Layer is AND DEWATERING FOR ORIFICE STRUCTURE, and the outer layer of load plate is solid slab structure, and the internal layer orifice plate of load plate is in contact with discrete material sample, adds
The internal layer orifice plate of support plate is as confining pressure conductive medium.
10. a kind of discrete material porosity intelligent recognition true triaxial experimental method uses discrete material described in claim 1
Porosity intelligent recognition true triaxial experimental system, it is characterised in that include the following steps:
Step 1: it first will connect detachable capping and the bolt of pressure chamber's cabinet unload, then control shaft pressure load jack
Piston rod retraction, until by it is detachable capping and first axle pressure load plate be lifted away from pressure chamber；
Step 2: the discrete material sample prepared is placed into the second axis pressure load plate upper surface, discrete material examination at this time
Sample is finished by heat shrinkage film package；
Step 3: by the mechanical confining pressure controller of computer control first and the second mechanical confining pressure controller action, until first
Mechanical confining pressure load plate and the second mechanical confining pressure load plate with discrete material sample contacts；
Step 4: the piston rod of control shaft pressure load jack stretches out, until detachable capping falls back to pressure chamber again
On body, then the bolt unloaded is all reinstalled；
Step 5: the piston rod for continuing control shaft pressure load jack stretches out, until first axle pressure load plate and discrete material are tried
Sample contact；
Step 6: manual three-position three-way valve is first adjusted to exhaust gear, Water filling valve is then turned on, starts to infuse into pressure chamber
Water, in the injecting process, the air in pressure chamber directly passes through manual three-position three-way valve and is discharged, when manual three-position three-way valve is begun with
After water discharge, Water filling valve is closed, pressure chamber completes water filling；
Step 7: manual three-position three-way valve is adjusted to confining pressure load gear, is then turned on confining pressure switch valve, then pass through computer
Liquid confining pressure controller action is controlled, starts to carry out confining pressure load to discrete material sample, until confining pressure reaches setting value；
Step 8: first opening hole pressure opening and closing valve, then controls the movement of hole pressure controller by computer, starts to scattered
Body material sample carries out pore pressure load, until pore pressure reaches setting value；
Step 9: by the mechanical confining pressure controller of computer control first and the second mechanical confining pressure controller action, to granular media material
Expect that sample carries out mechanical confining pressure load, until mechanical confining pressure reaches setting value；Meanwhile it is very heavy by the pressure load of computer control shaft
Top and axis pressure load cylinder movement, carry out axis pressure load to discrete material sample, until axis pressure reaches setting value；
Step 10: through the transparent tank wall of pressure chamber, Image Acquisition is carried out to discrete material sample by CCD camera, wherein pressing
The opaque tank wall of power room is as image background, for distinguishing the profile of discrete material sample and pressure chamber；Then pass through calculating
Machine carries out binary conversion treatment to acquired image, and black portions therein are the entity part of discrete material sample, and white
Part is the hole of discrete material sample；The area of black portions and white portion is counted again, granular media material can be analyzed
Expect the porosity change process of sample during the experiment.
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