CN108267360A - Microcomputer controls true triaxial frozen soil experiment machine - Google Patents

Microcomputer controls true triaxial frozen soil experiment machine Download PDF

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Publication number
CN108267360A
CN108267360A CN201810066376.0A CN201810066376A CN108267360A CN 108267360 A CN108267360 A CN 108267360A CN 201810066376 A CN201810066376 A CN 201810066376A CN 108267360 A CN108267360 A CN 108267360A
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CN
China
Prior art keywords
frame
guide rail
frozen soil
temperature
experiment
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Pending
Application number
CN201810066376.0A
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Chinese (zh)
Inventor
姚兆明
潘旋
江山
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Anhui University of Science and Technology
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Anhui University of Science and Technology
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Priority to CN201810066376.0A priority Critical patent/CN108267360A/en
Publication of CN108267360A publication Critical patent/CN108267360A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02Details
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/18Performing tests at high or low temperatures

Abstract

The present invention relates to a kind of microcomputers to control true triaxial frozen soil experiment machine, it is made of whole loading frame, floating loading frame Y, guide rail, lengthening compression bar, sample vehicle mobile device, specimen holder, data acquisition software etc., further includes control system, low-temperature test chamber, temperature control cabinet.The research of frozen soil mechanics has far reaching significance to China:First, there is vast permafrost region in China, and secondly, the development of underground engineering, freezing process is played the part of and its important role.Therefore, research and development frozen soil instrument is extremely important, and frozen soil mechanics property could be studied in this way, Practical Project is predicted.The present invention solves following problems:First, reducing the limitation because of series of factors such as site operation place, cost, times to cyopedology, facilitate researcher and numerous studies are unfolded to frozen soil;Second, the tester can more realistically react frozen soil true stress level, it is more accurate to the research of frozen soil mechanics rule, rigorous.

Description

Microcomputer controls true triaxial frozen soil experiment machine
Technical field
It is true under specifically a kind of simulation freezing soil and complex stress condition the present invention relates to a kind of true triaxial test machine Three axis frozen soil experiment machines.
Background technology
With the continuous growth of social demand, the property for studying freezing soil is particularly important.On the one hand China has vast Seasonal frozen ground and Permafrost Area, carry out engineering construction in permafrost region, the mechanical property of frozen soil must be just furtherd investigate, with true Protect the stability of engineering works on frozen soil foundation;The development of another aspect human productivity and the progress of science and technology, underground Railway, subterranean tunnel, more Jiang Yuehai tunnels are more and more, and engineering with artificial freezing method construction is shown up prominently, and becomes underground engineering primary hand One of section, so research frozen soil property is very urgent.However often degree of difficulty is high for the engineering of utilization freezing process, project cost is held high It is expensive.
Frozen soil, that is, temperature is 0 DEG C or soil and rock less than 0 DEG C.Ice is as cementing material, by adjacent soil particle or sillar The cementing connection of body and the intensity of structure increases, while reduce its water penetration.For the common soil body, due to shadows such as temperature It rings, frozen soil Quality Research is more difficult, carries out the research of frozen soil mechanics rule to frozen soil using True Triaxial Apparatus, more really Ground is close to the true stress state of frozen soil.But true triaxil tester principle is complicated, develops price costly, frozen soil mechanics and geotechnique The limitation of measuring technology development level, so the road that the research of frozen soil true triaxial is also very long.
Invention content
The object of the present invention is to provide a kind of true triaxial jellies that can simulate freezing soil and its complex stress boundary condition Native testing machine.The microcomputer controls true triaxial frozen soil experiment machine, can carry out indoor simulation to live frozen soil engineering soil mass property and grind Study carefully, reduce the project cost of frozen soil engineering;Frozen soil power can be carried out to frozen soil more realistically close to the true stress state of frozen soil Learn the research of rule.
The present invention realizes that goal of the invention adopts the following technical scheme that:
A kind of microcomputer controls true triaxial frozen soil experiment machine, by whole loading frame, floating loading frame Y, guide rail, lengthens and presses The compositions such as bar, sample vehicle mobile device, specimen holder, data acquisition software, further include control system, low-temperature test chamber, temperature control Cabinet.
Preferably, a kind of whole loading frame provided by the invention, and vertical loading system and horizontal addload system (X Direction) with load cylinder in the frame, is respectively provided with up and down, force snesor and pressing plate, whole loading frame are housed on piston Two columns are respectively provided with load cylinder, equipped with force snesor and pressing plate on piston, can realize Z-direction and X to the monitoring of power and Control.
Preferably, a kind of floating loading frame Y provided by the invention, by four columns, front pressuring plate, latter two pressing plate, loading The compositions such as oil cylinder, force snesor, pressing plate, floating frame are moved through small oil tank pulling with manual cartridge to control on guide rail, can To realize the monitoring and control of Y-direction power.
Preferably, a kind of guide rail provided by the invention, device includes two groups of guide rails, one group of (inside) guide rail low-temperature test Case, low-temperature test chamber switch board artificially move on guide rail, and cryogenic box releases loading frame when filling sample, open low temperature chamber door, Instruction carriage promotes cryogenic box, and centre-lock shuts low temperature chamber door, is pushed into loading frame;Another group of (outside) guide rail Floating loading frame moves on guide rail, can realize easy to operateization of experiment, liberates manpower.
Preferably, a kind of lengthening compression bar provided by the invention, for lengthen compression bar on cryogenic box and Y-direction oil cylinder away from From being hung out to turn 90 degrees out of floating frame braced frame and be placed on guide rail with lifting oil cylinder above when testing, after finishing experiment It slings to turn 90 degrees again and fall in frame.
Preferably, a kind of instruction carriage mobile device provided by the invention, by bottom plate, levelling bolt, levelling bolt pad, straight Line guide rail, specimen holder stent, specimen holder, square guide rail composition, two square rails pass through in levelling bolt and cryogenic box Guide rail is adjusted to same horizontal position, and specimen holder is pushed over after installing in chamber, then two square rails are withdrawn from, and improves Test efficiency and saving manpower.
Preferably, a kind of specimen holder provided by the invention, specimen holder are made of six block pressur plates, on every block pressur plate all There is prefix, be linked in sequence after being connected with screw, be packed into interior held out against periphery pressing plate with the screw on frame of frame and fix, The screw on pressing plate is laid down again, three deformation-sensors are attached to suitable position, then four levels are lengthened column screws In fixation, experiment, which is finished, to be laid down.The specimen holder can provide three types sample mould:Cube of 100mm, 150mm, 200mm Body provides test sample weighted platform, monitors sample deformation state.
Preferably, a kind of control system provided by the invention, from two vertical Zs to control system, 2 horizontal Xs, Y is watched Take controller and 5 force value sensors, the compositions such as 3 deformation-sensors in cryogenic box, by the display of sensor, then to system It is controlled and data is passed into computer and shown and handled, complete axial closed-loop control, can realize should to three-dimensional Power loading, deformation carry out accurate monitoring and control, can also data be shown and be handled.
Preferably, a kind of low-temperature test chamber provided by the invention, temperature control cabinet, low-temperature test chamber, temperature control cabinet are attached separately to On two trolleies, low-temperature test chamber is in floating frame, and temperature control cabinet is in floating frame rear end in the following, two small automobile steel sheet connects Together, floating frame is displaced outwardly when filling sample and then low-temperature test chamber, temperature control cabinet are released together simultaneously, guide rail in incubator On opposite with mobile sample vehicle upper rail, incubator locating piece is promoted to shut incubator door after installing the specimen holder on locomotive, Floating frame and cryogenic box, temperature control cabinet move on to original position, and required temperature condition can be provided for experiment, and raising tests accuracy and can Row.
Preferably, a kind of data acquisition software provided by the invention, can real-time display trial curve and result of the test, Experiment whole process is monitored and data can be handled, there is powerful data processing and acquisition capacity.
Advantageous effect:
Compared with prior art, the present invention advantage is embodied in:
1st, before actually frozen construction is carried out, can analog simulation experiment be carried out by the present invention indoors, actually to apply Work provides design parameter and experience, and great amount of cost is saved for Practical Project.
2nd, since construction freezing method is of high cost and the limitation of frozen soil domain of the existence, so scientific research personnel is wanted to the frozen soil soil body During mechanical property Quality Research, often by various limitations, numerous studies can not be unfolded.The present invention can be in smaller cost Under, Practical Project is simulated, makes the research of researcher will not be limited by fund, time, place, facilitates research.
3rd, for the common soil body, due to influences such as temperature, frozen soil Quality Research is more difficult, utilizes true triaxial Tester carries out frozen soil the research of frozen soil mechanics rule, can be more realistically close to the true stress state of frozen soil, to frozen soil Mechanical property Quality Research is of great significance.
Description of the drawings
Below in conjunction with the accompanying drawings, the present invention is further explained by example.
Fig. 1 is testing machine schematic diagram, as shown in the figure, being floated by low-temperature test chamber, temperature control cabinet, air inlet duct, air -return duct, Y-direction Oil cylinder, specimen holder device, Y-direction extension bar boom hoisting, Y-direction under actuator, Z-direction loading device are loaded on loading frame, Z-direction Extension rod device, Y-direction load cylinder, wear pin, Y-direction loading frame pull unit, X to load cylinder, whole loading frame (Z-direction, X is to loading frame) it is formed by connecting.
Fig. 2 is specimen holder schematic diagram, as shown in the figure, axially being become from X to deformation-sensor, Y-direction deformation-sensor, Z-direction Shape sensor, pressing plate lengthen column, outer framework, trundle, small car body composition.
Specific embodiment
Embodiment 1
Study Laws of Mechanics of the manual pipe jacking soil body under permanent test force true triaxial test.
The first step:Design of physical model
Determine soil types, according to scale model theory acquire geometry contracting ratio, temperature contracting ratio, the time contracting than etc., measure soil Body basic parameter determines model geometric size and its solidification point.
Second step:Model buildings
First, according to experimental design, the soil body is made to the square of estimated size, freezes 48h.Then after 48h, in perseverance It is operated in incubator, sample is put into specimen holder according to explanation, temperature influences it, and according to examination when reducing installation sample It tests machine schematic diagram and illustrates attachment device, including Loading Control System, DEFORMATION MONITORING SYSTEM, servo pressurization, computer connection etc.. Completion is built, is tested.
Third walks:Experiment is implemented
After the completion of test simulation is built, start machine, controlled it with computer software, keep examination during the experiment It is constant to test power, each physical quantity is monitored to sample, when accomplishing the end in view, stops experiment.
4th step:Data Processing in Experiment and analysis
After experiment, during experiment is obtained, the physical quantity on three directions of soil body sample.Experimental result is carried out Figure and data preserve, and study changing rule.
Embodiment 2
It studies the manual pipe jacking soil body and deforms the Laws of Mechanics under true triaxial test in constant speed.
The first step:Design of physical model
Determine soil types, according to scale model theory acquire geometry contracting ratio, temperature contracting ratio, the time contracting than etc., measure soil Body basic parameter determines model geometric size and its solidification point.
Second step:Model buildings
First, according to experimental design, the soil body is made to the square of estimated size, freezes 48h.Then after 48h, in perseverance It is operated in incubator, sample is put into specimen holder according to explanation, temperature influences it, and according to examination when reducing installation sample It tests machine schematic diagram and illustrates attachment device, including Loading Control System, DEFORMATION MONITORING SYSTEM, servo pressurization, computer connection etc.. Completion is built, is tested.
Third walks:Experiment is implemented
After the completion of test simulation is built, start machine, controlled it with computer software, keep permanent during the experiment Rate deformation, to sample, each physical quantity is monitored, and when accomplishing the end in view, stops experiment.
4th step:Data Processing in Experiment and analysis
After experiment, during experiment is obtained, the physical quantity on three directions of soil body sample.Experimental result is carried out Figure and data preserve, and study changing rule.

Claims (10)

1. a kind of microcomputer controls true triaxial frozen soil experiment machine, by whole loading frame, floating loading frame Y, guide rail, lengthen and press The compositions such as bar, sample vehicle mobile device, specimen holder, data acquisition software, which is characterized in that further include control system, low temperature Chamber, temperature control cabinet.
2. a kind of whole loading frame according to claim 1, it is characterised in that:Vertical loading system and horizontal addload system (X-direction) is united in a whole loading frame, load cylinder is respectively provided with up and down, force snesor and pressure is housed on piston Plate, whole two columns of loading frame are respectively provided with load cylinder, equipped with force snesor and pressing plate on piston, realize Z-direction and X to The monitoring and control of power.
3. a kind of floating loading frame Y according to claim 1, it is characterised in that;By four columns, front pressuring plate, latter two pressure The compositions such as plate, load cylinder, force snesor, pressing plate, floating frame be moved through on guide rail small oil tank pulling with manual cartridge come The Detection & Controling of Y-direction power are realized in control.
4. a kind of guide rail according to claim 1, it is characterised in that:Device includes two groups of guide rails, one group of (inside) guide rail Low-temperature test chamber, low-temperature test chamber switch board artificially move on guide rail, and cryogenic box releases loading frame when filling sample, open low Incubator door, instruction carriage promote cryogenic box, and centre-lock shuts low temperature chamber door, is pushed into loading frame;Another group (outer Side) guide rail floating loading frame moves on guide rail, realize easy to operateization of experiment.
5. a kind of lengthening compression bar according to claim 1, it is characterised in that:For lengthening compression bar and the Y side on cryogenic box It hangs out to turn 90 degrees out of floating frame braced frame with lifting oil cylinder above to oil cylinder distance, when testing and be placed on guide rail, do It slings to turn 90 degrees again after complete experiment and fall in frame.
6. a kind of instruction carriage mobile device according to claim 1, it is characterised in that:By bottom plate, levelling bolt, leveling spiral shell Pad, the linear guide, specimen holder stent, specimen holder, square guide rail composition are followed closely, two square rails pass through levelling bolt and low temperature Guide rail in case is adjusted to same horizontal position, and specimen holder is pushed over after installing in chamber, then two square rails are removed Go out, improve test efficiency and save manpower.
7. a kind of specimen holder according to claim 1, it is characterised in that:Specimen holder is formed with six block pressur plates, every piece There is prefix on pressing plate, be linked in sequence after being connected with screw, be packed into the screw on the interior frame of frame by periphery pressing plate top Fastening is set, then the screw on pressing plate is laid down, and three deformation-sensors are attached to suitable position, then four levels are lengthened Column is screwed, and experiment, which is finished, to be laid down, it is possible to provide the sample mould of sizes.
8. a kind of control system according to claim 1, it is characterised in that:From two vertical Zs to control system, 2 water Flat X, Y servo controller and 5 force value sensors, the compositions such as 3 deformation-sensors in cryogenic box, by the display of sensor, so System is controlled afterwards and data are passed into computer and is shown and is handled, completes axial closed-loop control.
9. a kind of low-temperature test chamber according to claim 1, temperature control cabinet, it is characterised in that:Low-temperature test chamber, temperature control cabinet point Zhuan not be on two trolleies, low-temperature test chamber is in floating frame, and temperature control cabinet is in floating frame rear end in the following, two small automobile-used steel Plate links together, and floating frame is displaced outwardly when filling sample and then low-temperature test chamber, temperature control cabinet are released together simultaneously, incubator On interior guide rail is opposite with mobile sample vehicle upper rail, incubator locating piece is promoted to shut temperature after installing the specimen holder on locomotive Chamber door, floating frame and cryogenic box, temperature control cabinet move on to original position, and the temperature condition being more suitable for is provided for experiment, improve experiment essence True property.
10. a kind of data acquisition software according to claim 1, it is characterised in that:Experiment can be electronically controlled, Operating procedure and method, real-time display trial curve and result of the test are controlled, experiment whole process is monitored and can handled Data have powerful data processing and acquisition capacity.
CN201810066376.0A 2018-01-24 2018-01-24 Microcomputer controls true triaxial frozen soil experiment machine Pending CN108267360A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111458214A (en) * 2019-12-24 2020-07-28 南京理工大学 True triaxial loading test device for large-size frozen soil

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Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
CN103969107A (en) * 2014-05-06 2014-08-06 广西大学 High-pressure servo dynamic true triaxial testing machine
CN204588584U (en) * 2015-04-16 2015-08-26 安徽理工大学 A kind of Artificial Frozen Soil three-axis tester pressure chamber lifting packaged type dolly
CN106198264A (en) * 2016-06-30 2016-12-07 安徽理工大学 A kind of true triaxial rock adds unloading disturbance experimental provision and using method thereof
CN106248487A (en) * 2016-09-28 2016-12-21 中国科学院武汉岩土力学研究所 A kind of rock true triaxial test equipment

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Application publication date: 20180710

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