CN106680129B - Rock sample recycles the simulation of dry and wet freezing-thawing and damage deterioration test device - Google Patents
Rock sample recycles the simulation of dry and wet freezing-thawing and damage deterioration test device Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/60—Investigating resistance of materials, e.g. refractory materials, to rapid heat changes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0224—Thermal cycling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
- G01N2203/0647—Image analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
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Abstract
The invention discloses a kind of circulation dry and wet freezing-thawing simulation of rock sample and damage deterioration test devices and its method, it is characterised in that: the device includes vacuum pump and gas piping, water pump and liquid line, temperature control box；Sample chamber places rock sample in temperature control box, and the radial and axial deformation-sensor of high temperature resistant is respectively set with axial in radial direction on rock sample, and vacuum pump connection gas piping simultaneously accesses at the top of sample chamber, and water pump one end connects liquid line and simultaneously accesses sample chamber bottom；Level sensor is set on sealing cover body to be placed in sample chamber, and scanning means is set on the outside of sample chamber.The present invention realizes sample containing fissure rock in multiple several circulating analogs of the complex environments such as room temperature to high temperature drying, vacuum pressure saturation, cooling frost and heating thaw using the control of microcomputor program controller；Radial and axial strain data acquisition and record are carried out using microcomputer, damage deterioration during dry and wet Frozen-thawed cycled repeatedly is tested using scanning system.The device has automation, integral feature, and economic and environment-friendly, and human intervention is few, and test job is high-efficient.
Description
Technical field
The present invention relates to rock engineering technical field, it is related to simulating the system of crack rock freeze thawing test specimen under complicated environmental condition
Standby and complex environment damages deterioration process measuring technology and method to rock sample physico-mechanical properties, follows more particularly to a kind of rock sample
Ring drying, the simulation of saturation freezing-thawing and its damage deterioration test device and method.
Background technique
Rock And Soil in the earth's crust for a long time by slackings such as solar radiation, water (melting snow or ice), make Rock-soil Mass Structure and
Mechanical property deteriorates.Drying and watering cycle and Frozen-thawed cycled are two kinds of slackings the most typical.Drying and watering cycle is Rock And Soil
Absorption of Medium air moisture or atmospheric precipitation and be saturated, absorb the evaporation of solar irradiation moisture or air-dried physical recycling process, instead
Multiple drying and watering cycle can be such that Mechanical property softens.Freeze thawing be rock-soil layer since temperature is down to zero it is following and rise to zero degree with
It is upper and generate a kind of physico-geological function and phenomenon freezed and melted.Ice just generates biggish ice-cleat to rock fracture both wings and makees
With；And melt when temperature gos up, the pressure for acting on crack both wings die-offs, the unloading of crack both wings.In freezing and melting repeatedly
During change, the crack of rock will expand, increase, and come out so that stone is divided, and generate unfreezing.Cause this freeze thawing
The reason of destruction is since composition rock freezes have different heat with the three-phase medium of melting state (water, air, stone containing aqualite)
Physical property, rock forming mineral particle temperature reduce when, volume is shunk, and ice temperature reduce when, volume occur it is swollen
Swollen (about 9%), rock forming mineral particle is in order to limit this expansion, since this frost-heave force is to act on mineral grain and rock is micro-
On this micro-scale of hole, therefore the presence of pore water and freeze-thaw cycles can deteriorate the damage of rock and generate deep shadow
It rings.
As country builds western Devoting Major Efforts To Developing in recent years, many large-sized rock mass engineerings in high and cold mountain area, as: North SinKiang
Area's hydroelectric project, qinghai-tibet railway engineering, West Line of South-North Water Transfer Project, Oil Pipeline construction etc., two numerous profound Tunnel Engineering,
All refer to the physical processes such as saturation drying, freezing and thawing and the ion exchange (chemical attack) of crack rock.Freeze rock mass
Major project harm have rock side slope because by freeze-thaw weathering erosion so as to cause avalanche and landslide, crack rock following
Frost heave cracking, unstability in ring frozen-thaw process etc.；Caused engineering under high-temperature gradient after the buried High-geotemperature rock excavation in underground
Coffer mechanics property-deterioration.Its main mechanism is the rock containing the grown-in defects such as crack and joint, is freezing, is melting and freeze thawing follows
Under the conditions of ring, phase transformation caused by physico-mechanical properties macroscopic view basic change rule, internal water Cheng Bing and water-energy budget feature, with
And the macro mesoscopic numerical test rule of rock caused by different temperatures history and different water cut (ice) state.Freeze to melt in cold district
Solution effect is main rock mass physical slacking, and the freeze-thaw damage of rock mass has become the master being commonly encountered in cold area's rock mass engineering project
Want one of disease.If the Western Tianshan main peak of height above sea level 4000m or more is passed through in Xinjiang Tianshan highway major part section, ultraviolet light linchpin is penetrated strong
It is strong, belonging to not only day and night temperature is big for high and cold mountain area and also season temperature difference great disparity (year thermal extremes weather up to 40.8 DEG C,
And year, extreme cold weather was then at -35.6 DEG C), the multigelation of annual cycles causes side slope exposed rock mass gradually loose
Broken, the geological disasters such as avalanche, landslide happen occasionally.In addition, the dynamics developed and built with the water conservancy and hydropower of Condition in North Xinjiang
It increases, the freeze thawing deterioration problem of water power Dam Site high precipitous rock slope is increasingly prominent.It is dry to be such as located at Altay Prefecture's Burqin river
The QBT water-control project of middle reaches valley section is flowed, the Dam Site many years lowest temperature is -45 DEG C, 36.6 DEG C of the highest temperature, extreme warm
Difference is more than 80 DEG C.The Qi Reha tal fibre hydro country rock temperature difference of Southern Xinjiang hot work in progress is up to 90 more and spends again, after excavation
Paddling, (upstream snow-broth) rock body temperature the complex environments variation such as reduces suddenly and generates deterioration to rock mass physical mechanical property and makees afterwards
With.
The deterioration of Rock Nature all refers to dry to the dry and wet of saturation and alternately and repeatedly, in crack consolidate in situation described above
The freezing and thawing that state mutually arrives liquid phase mutually converts the simulation of equal complex environments, therefore, is attempted to that dry and wet is frozen repeatedly to rock
The simulation and rock and its deterioration process for melting complex environment are studied.But all the time, lack a kind of when can simulate long enough
Between and cycle-index under the integrated device and method realized automatically of complex environment, the present invention can solve this technology hardly possible
Topic.
CN201310544106.3 discloses a kind of experimental rig of simulation rock crack freeze thawing water-energy budget, it includes splitting
Gap bottom plate, adjustable setting, warm end temperature control panel, water scale, freeze box, crack cladding plate, cold end fill the water stopple, level
Instrument, crack, crack bottom plate are connect with crack cladding plate, and the warm end sink of crack both ends setting and warm end sink warm up end sink top
Crack cladding plate aperture, the steel bellow of connecting external diameter, outside package freeze box, outer end connects water scale, cold end sink
The crack cladding plate on top opens water injection hole, and installation cold end fills the water stopple, and crack bottom base plate installs adjustable setting, on the cladding plate of crack
Level meter is installed in portion, warms up the warm end temperature control panel of end bottom of gullet installation.Structure is simple, easy to process, easily operated；It is controllable
Warm end and cold junction temperature, to realize that temperature gradient controls under frozen environment；It can not equality of temperature in accurate and visual reflection freezing process
Spend the transport flux of moisture in crack under gradient.
CN201210094416.5 discloses the real-time monitoring device and method of a kind of rock freezing-thawing damage destruction.The detection
Device includes left and right two devices, and left and right two devices are connected by screw bolt and nut, and each device is by packing groove and fixation
Device composition, fixed device are equipped with electrode jack, and electrode jack is connected by wire with metal mesh sheet, metal mesh sheet setting
In installation bore ends, mounting hole is arranged on the securing means, and electrode jack is connected by electrode bolt with conducting wire, and sample both ends are set
In in mounting hole, sample is coated with rubber membrane.The method is done as follows: sample processed, full water；Installation sample is simultaneously put into
In freezing-thawing test machine, freezing-thawing test is carried out, measures ac impedance spectroscopy；Analyze the changing rule that rock freezing-thawing damage destroys.This hair
It is bright that rock freezing-thawing damage feature can be tested on the basis of not destroying rock sample internal microstructure, while can also be tried in freeze thawing
Its damage and failure measurement is carried out during testing.
CN2012201350013 discloses a kind of for measuring the device of rock freezing-thawing damage feature, including left and right two knots
The identical device of structure is connected at the end angle of left and right two devices by screw bolt and nut, and each device is by packing groove and fixed fills
Composition is set, handle is connected on the upper lid of packing groove, fixed device is equipped with electrode jack, and electrode jack passes through wire and metal
Mesh sheet is connected, and metal mesh sheet setting is connected on the securing means and with packing groove in installation bore ends, mounting hole setting, and electrode is inserted
Hole is connected by electrode bolt with conducting wire, and sample both ends are placed in mounting hole, and sample is coated with rubber membrane.The utility model can
To test rock freezing-thawing damage feature on the basis of not destroying rock sample internal microstructure, while can also be in freezing-thawing test mistake
Its damage and failure measurement is carried out in journey.
CN201410848369.8 disclose it is a kind of measurement supercritical carbon dioxide under the conditions of rock triaxial strength device,
It include triaxial test cabin, core clamping device, gas supply system, hydraulic oil confining pressure loading system and be equipped with controller with
And the computer of experimental data collector, the inlet valve that triaxial test is provided with heating coil on wall out of my cabin, is connected to triaxial test cabin
And oil return valve, core clamping device are made of core holding unit, air cushion, insulating self-adhesive band and thermal shrinkable sleeve, gas supply system
System is made of sequentially connected dioxide bottle, gas booster and air compressor, it also discloses measuring method.
Above described application provides rock freezing-thawing damage and the monitorings or measuring device of destruction.But for a long time, room
Interior test is respective self-contained process to the saturation drying course of crack rock, freezing and thawing process, often simulates above procedure
A circulation at least need 6~7 days, take time and effort, and the period is long.For the temperature with summer in winter circulation reciprocal all the year round
Degree variation and actual environment analog approximation, need the simulation of rock mass in the large scale time by the deterioration of complex environment, according to biography
Independent manually operated alternative's required time of uniting and manpower are unimaginable.Therefore, it is necessary to one kind can collect saturation drying course, freeze
The equipment and test device and method of the microcomputer automatic control of knot melting process to realize, simulate under systemic circulation number by complex environment
And test.
Summary of the invention
The problem to be solved in the present invention is physical mechanics property of the desk research crack rock after by the effect of complicated external environment
Shoddyization evaluation provides device and method, provides a kind of circulation dry and wet freezing-thawing simulation of rock sample and its damage deterioration test device
And its method.Sample containing fissure rock dries from room temperature to high temperature, it is each to melt etc. from unsaturation-saturation, cooling frost and heating
Plasticity volume deformation measurement is measured using high temperature resistant axial sensor and radial transducer in a link, for asking indirectly
The amount of damage evolutionary process during the plastic volumetric strain quantitatively characterizing complex loops is taken, realizes the damage deterioration of rock sample freeze thawing
Test, equipment have many characteristics, such as integrated, automation and human-computer interaction, and economic and environment-friendly, reduce human intervention.
Another object of the present invention is just to provide one kind and automatically controls rock sample circulation dry and wet freezing-thawing by microcomputor program
Simulation test, deformation test and computer under alternating temperature-changing in rock sample dry and wet Frozen-thawed cycled damage deterioration process collect strain
Test data, by CT scanning device and nuclear magnetic resonance device complete monitoring can sample in the sample chamber of hard radiation, microcomputer
Distributed intelligence and the storage of pore structure or remaining irreducible water inside system acquisition rock sample.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of rock sample circulation dry and wet freezing-thawing mould
Quasi- and damage deterioration test device, it is characterised in that: the device includes vacuum pump and gas piping, water pump and liquid line, temperature
Control case；It is provided with sample chamber in the temperature control box, rock sample is placed in sample chamber, radial direction is respectively arranged with axial on the rock sample
High temperature resistant radial deformation sensor and axial deformation sensor, are arranged sealing cover body on the temperature control box, on the sealing cover body
Sealed interface is set, and the radial deformation sensor and axial deformation sensor are respectively connected to sealed interface one, sealed interface two；
The vacuum pump connects gas piping and accesses at the top of sample chamber, and described water pump one end connects liquid line and accesses
13 bottom of sample chamber；
The sealing cover body is equipped with level sensor and is placed in sample chamber；
Scanning means is provided on the outside of the sample chamber.
Preferably, being equipped with threeway one on the gas piping of the vacuum pump connection, the threeway one is respectively communicated with examination
At the top of specimen chamber and liquid recovery tank, the sample chamber top and the gas piping of liquid recovery tank install pneumatic operated valve one, gas respectively
Dynamic valve two, the vacuum pump are passed through buffering gas tank.
Preferably, being equipped with pneumatic operated valve four and threeway two on the liquid line of the water pump connection, the threeway two divides
Not Lian Tong sample chamber bottom and liquid recovery tank, pneumatic operated valve three is installed on the liquid line on the liquid recovery tank.
Preferably, the water pump other end connects threeway three, threeway three is respectively communicated with water supply tank and liquid recovery tank.
Preferably, the scanning means is CT scanner or nuclear magnetic resonance device, and access independent microsystem.
Moreover, the temperature control box, vacuum pump, water pump, pneumatic operated valve one, pneumatic operated valve two, pneumatic operated valve three, pneumatic operated valve four, liquid level
Detector is respectively connected to microcomputor program controller, and the radial deformation sensor and axial deformation sensor pass through sealed interface
One, sealed interface two accesses computer data acquisition system.
Moreover, the sample chamber material uses ray or the transparent nonmetallic materials PEEK of electromagnetic wave.
A kind of circulation dry and wet freezing-thawing simulation of rock sample and damage deterioration test method, the specific steps are as follows:
Into the control interface of microcomputor program controller, sets rock sample heating, drying and extract vacuum, saturation, refrigeration, heating
Time, dry and wet freezing-thawing cycles；
1) program starts heating drying system automatically；By rock sample heating, drying, 100~125 DEG C of heating temperature, to rock sample into
Row scanning, starts high temperature resistant radial deformation sensor and axial deformation sensor acquires deformation data, when heating reaches setting
Between when, instruction close heating system, complete drying course；
2) procedure auto-control vacuumizes: pneumatic operated valve one is opened, and vacuum pump vacuumizes the sample chamber equipped with rock sample,
Reach the evacuated time of setting, pneumatic operated valve one is closed, and vacuum pump is closed；
3) procedure auto-control rock sample is saturated；Pneumatic operated valve four and water pump automatically open simultaneously, and sample water passes through liquid line
Into in sample chamber, level sensor is monitored, and when reaching setting liquid level, pneumatic operated valve four is automatically closed after triggering, and rock sample fills
Divide saturation, when saturation reaches setting time, pneumatic operated valve three is opened, and water is put into liquid recovery tank, is vented sample indoor water, instruction
Pneumatic operated valve three is closed, water in liquid recovery tank is evacuated in water supply tank by starting water pump；
4) program starts refrigeration system automatically；Rock sample is freezed, rock sample is scanned, when freezing reaches setting time
When, instruction closing refrigeration system completes freezing, is then turned on heating system, and when heating reaches setting time, instruction, which is closed, to be added
Hot systems complete dissolution and heating course of defrosting；
5) procedure auto-control vacuum system；Pneumatic operated valve two and pneumatic operated valve San Tong method automatically open, after freeze thawing in rock sample
Free state water or irreducible water evacuated, by rock sample water extract out, when reaching setting time, pneumatic operated valve two and pneumatic operated valve
San Tong method is closed；
6) automatic execute enters the second wheel dry and wet Frozen-thawed cycled, until completing program setting cycle-index: during circulation, on
It states 5 steps and executes the last pore structure or remaining beam that will be scanned inside record rock sample using scanner or nuclear magnetic resonance device
The distributed intelligence collection for tiing up water is sent to microsystem, radial deformation sensor and axial deformation sensor for strain measurement data
It is transmitted to computer data acquisition system.
The liquid line is superhigh molecular weight polyethylene pipe, and sample water can be normality water, weak acid or alkalescent water.
The advantages and positive effects of the present invention are:
1, the simulation of rock sample circulation dry and wet freezing-thawing and damage deterioration test device of the present invention, due to being placed on using rock sample
Temperature control box, settable high/low temperature constant temperature, and vacuum pump, water pump are accessed, realization vacuumizes-forces saturation-fine frozen to rock sample
Knot-heating freeze thawing-vacuumizes the complex environment simulation of (process recycling) and the test of the rock sample damage deterioration during this follows
Ring dry and wet freezing-thawing simulation test, and sample chamber is see-through material, is monitored convenient for CT scanning device or Nuclear Magnetic Resonance
Crack germinating, connection and expansion process or rock sample body of the rock sample cross sections under different cycle-indexes in its section in sample chamber
Interior water translocation process, microsystem writing scan data.
2, the simulation of rock sample circulation dry and wet freezing-thawing and damage deterioration test device of the present invention, due to controlling case, vacuum pump, water
Pump, pneumatic operated valve, level sensor are respectively connected to microcomputor program controller, and by the control interface of microcomputor program controller, setting adds
It temperature and holds time, vacuum drawn and hold time, saturation time, cryogenic temperature and hold time, thaw temperature and dimension
Time, cycle-index are held, and controls temperature control box refrigeration, heating and constant temperature, control pneumatic operated valve opens and closes, the entire survey of realization
For examination process completely by microcomputer automatic control, the data in test process carry out whole acquisition post-processing by computer.
3, the present invention is vacuumized using procedure auto-control, and setting buffering gas tank carries out vacuum deposit, and pneumatic operated valve can be by journey
Sequence interface button or the indoor vacuum negative pressure condition of program automatic open close sample, procedure auto-control rock sample saturation, the dry and wet are frozen
Water or other saturated solutions, such as faintly acid or alkalescent saturated solution can be used during melting, it is molten acid-base property can be simulated whereby
Test of the liquid to Rock Matrix chemical attack effect, when ion exchange occurs for solution and soluble salt in rock sample etc. or reacts, repeatedly
Environmental simulation circulation after filtrate can carry out the extraction of liquid sample and test analysis, thus realize rock sample heating, drying-vacuumize-
Saturation-refrigeration is freezed-is forced to heat the chemical attack of the circulation environmental simulation melted and its damage deterioration test and fluid structurecoupling
Test process.
4, the simulation of rock sample of the present invention circulation dry and wet freezing-thawing and damage deterioration test device, due on rock sample it is radial with
It axially is respectively arranged with radial deformation sensor and axial deformation sensor resistant to high temperature, rock sample is precisely tested and freezes in circulation dry and wet
Melt strain variation in environment alternation, and accesses computer data acquisition system and carry out data collection and processing.
5, the present invention is due to using the circulation dry and wet freezing-thawing simulation of microcomputor program controller rock sample, computer data acquiring
System acquisition radial deformation sensor and axial deformation strain transducer data, rock of the scanning means to radiolucent sample chamber
The distributed intelligence of pore structure or remaining irreducible water inside sample test specimen is acquired and handles；The present invention has integration of equipments
Change, microcomputer automatic control, economic and environment-friendly, human intervention is few and realizes the simulation of uninterrupted circulation complex environment, is that freeze thawing is damaged
The mechanical property research for hurting rock sample provides test material preparation and its damage testing platform under dry and wet Freezing-Melting Condition, further may be used
To simulate crack rock freezing-thawing damage Mechanism Study under chemical etching condition.
6, the simulation of rock sample circulation dry and wet freezing-thawing and damage deterioration test device of the present invention, since sample chamber uses non-gold
Belong to high strength nonmetallic material PEEK production, may be implemented CT scanning device or nuclear magnetic resonance machine ray or electromagnetic wave to examination
The transmission of specimen chamber, thus test specimen imaging inside structure or moisture distribution and transition process during realizing environmental simulation can
Depending on changing.
Detailed description of the invention
Fig. 1 is rock sample circulation dry and wet freezing-thawing simulation and damage deterioration test device schematic diagram.
Fig. 2 is rock sample circulation dry and wet freezing-thawing simulation and damage deterioration test frame principle figure.
In figure: pneumatic operated valve 1, pneumatic operated valve 22, pneumatic operated valve 33, pneumatic operated valve 44, vacuum pump 5, buffering gas tank 6, threeway one
7, temperature control box 8, scanner 9, sealing cover body 10, level sensor 11, rock sample 12, sample chamber 13, water pump 14, microcomputer 15, threeway
2 16, threeway 3 17, sealed interface 1, sealed interface 2 18 ', radial deformation sensor 19, axial deformation sensor 20, liquid
Body recycling can 21, gas piping 22, water valve 23, water supply tank 24, liquid line 25.
Specific embodiment
In order to better understand the present invention, the present invention is further retouched with attached drawing combined with specific embodiments below
It states.
As shown in Figure 1, 2, the present invention provides a kind of circulation dry and wet freezing-thawing simulation of rock sample and damage deterioration test device.
The device is made of vacuum pump 5 and gas piping 22, water pump 14 and liquid line 25, temperature control box 8 etc., and sample chamber 13 is placed in temperature control
In case 8, temperature control box 8 is controlled by peripheral hardware cooling and warming, rock sample 12 is placed in sample chamber 13, radial direction is set respectively with axial on rock sample 12
It is equipped with radial deformation sensor 19 and axial deformation sensor 20, sealing cover body 10 is set on temperature control box 8, test signal wire uses
Sealed interface 1, sealed interface 2 18 ', radial deformation sensor are arranged on sealing cover body 10 for inside and outside sealed interface 18,18 '
19 and axial deformation sensor 20 using high temperature resistant sensor and sealed interface 18, sealed interface 2 18 ' is separately connected, to survey
Rock sample deformation test under the entire circulation environment simulated conditions of examination, radial deformation sensor 19 and axial deformation sensor 20 pass through
Sealed interface 18, sealed interface 2 18 ' are respectively connected to computer data acquisition system and collect test data；It is set on sealing cover body 10
There is level sensor 11, level sensor 11 passes through sealing cover body 10 and is placed in sample chamber 13, to detect its internal liquid
Lifting height.
Sample chamber 13 be it is see-through, 13 material of sample chamber use ray or the transparent nonmetallic materials PEEK of electromagnetic wave,
In 8 outside of temperature control box, 13 opposite of sample chamber is placed with scanning means 9, and scanning means can be CT scan system or nuclear magnetic resonance
Device simultaneously accesses independent microsystem.
Vacuum pump 5 connects gas piping 22, is equipped with threeway 1 on gas piping 22, threeway 1 is respectively communicated with sample chamber
Pneumatic operated valve one is installed respectively on the gas piping 22 of 13 tops and liquid recovery tank 21,13 top of sample chamber and liquid recovery tank 21
1, pneumatic operated valve 22, vacuum pump 5 are passed through buffering gas tank 6；14 one end of water pump connects liquid line 25, is equipped on liquid line 25
Pneumatic operated valve 44 and threeway 2 16, threeway 2 16 are respectively communicated in 13 bottom of sample chamber and liquid recovery tank 21, liquid recovery tank 21
Liquid line 25 on install pneumatic operated valve three；14 other end of water pump connects threeway 3 17, and threeway 3 17 is connected to water supply tank 24 and liquid
21 bottom of body recycling can is equipped with water valve 23 on the liquid line 25 of water supply tank 24.
Temperature control box 8, vacuum pump 5, water pump 14, pneumatic operated valve 1, pneumatic operated valve 22, pneumatic operated valve 33, pneumatic operated valve 44, liquid level are visited
It surveys device 11 and is respectively connected to microcomputor program controller 15, its opening and closing is controlled using microcomputor program, and record test data.
Liquid line is superhigh molecular weight polyethylene pipe production, and sample water can be normality water, weak acid or alkalescent water.
A kind of circulation dry and wet freezing-thawing simulation of rock sample and damage deterioration test method, the specific steps are as follows:
The microcomputor program controller host of startup environment circulating analog first, sample chamber 13 is put into rock sample 12 in temperature control box 8,
Rock sample specification: 25 × 100mm of Φ, 50 × 100mm of Φ, 100 × 100mm of Φ is tested, at this time pneumatic operated valve 1, pneumatic operated valve 22, gas
Dynamic valve 33,44 valve of pneumatic operated valve are in closed state, open the power supply of vacuum pump 5, temperature control box 8, water supply pump 14, rock sample
Radial deformation sensor 19, axial deformation sensor 20 are installed on 12 and access computer data acquisition system.
Open the entrance control interface of microcomputor program controller, setting pumpdown time length, saturation time length, refrigeration
Length of time, temperature control box warm-up time length, cycle-index, temperature range: -50 DEG C~125 DEG C, control program executes automatically；
1) program starts heating drying system automatically: by rock sample heating, drying, 100~125 DEG C of heating temperature, to rock sample into
Row scanning, radial deformation sensor and axial deformation sensor, when heating reaches setting time, heating system is closed in instruction,
Complete drying course；
2) procedure auto-control vacuumizes；Pneumatic operated valve one is opened, and vacuum pump vacuumizes the sample chamber equipped with rock sample,
Reach the evacuated time of setting, vacuum degree: 4~6 × 102Pa, pneumatic operated valve one are closed, and vacuum pump is closed；
3) procedure auto-control rock sample is saturated；The response of process control whole system delay 3 seconds, pneumatic operated valve four and water pump were simultaneously
It automatically opens, sample saturated water (or solution) is entered in sample chamber by liquid line, and level sensor is monitored, and will letter
Number microcomputor program controller is issued, when the saturated water (or solution) of entrance reaches the liquid level of setting, pneumatic operated valve four is automatically closed,
Rock sample is sufficiently saturated, and when saturation reaches setting time, pneumatic operated valve three is opened, and water is put into liquid recovery tank, is vented in sample chamber
Water, signal issued microcomputor program controller by level sensor 11, and is issued instruction and closed pneumatic operated valve three, and starting water pump will
Water is taken out or is evacuated in water supply tank in liquid recovery tank；
4) program starts refrigeration system automatically；Rock sample is freezed, rock sample is scanned, when freezing reaches setting time
When, refrigeration system is closed in the instruction of microcomputor program controller, it is then turned on heating system, when heating reaches setting time, and instruction
Heating system is closed, frost and dissolution and heating heating process are completed；
5) procedure auto-control vacuum system；Pneumatic operated valve two and pneumatic operated valve San Tong method automatically open, after freeze thawing in rock sample
Free state water or irreducible water evacuated, by rock sample water extract out, when reaching setting time, pneumatic operated valve two and pneumatic operated valve
San Tong method is closed；
6) automatic execute enters the second wheel circulation, until completing program setting cycle-index；During circulation, scanner or core
The distributed intelligence collection of pore structure or remaining irreducible water inside scanning record rock sample is sent to microcomputer system by magnetic resonance device
Strain measurement data are transmitted to computer data acquisition system by system, radial deformation sensor and axial deformation sensor.
The embodiments of the present invention have been described in detail above, but content is only the preferred embodiment of the present invention,
It should not be considered as limiting the scope of the invention.All changes and improvements made in accordance with the scope of the present invention, should all
It still belongs within this patent covering scope.
Claims (2)
1. a kind of rock sample circulation dry and wet freezing-thawing simulation and damage deterioration test device, it is characterised in that: the device includes true
Sky pump and gas piping, water pump and liquid line, temperature control box；Temperature control box can heat, freeze and keep constant temperature；In the temperature control box
It is provided with sample chamber, rock sample is placed in sample chamber, radial direction is respectively arranged with high temperature resistant radial deformation biography with axial on the rock sample
Sensor, axial deformation sensor are arranged sealing cover body on the temperature control box, sealed interface are arranged on the sealing cover body, described
Radial deformation sensor and axial deformation sensor are respectively connected to sealed interface one, sealed interface two；
The sealing cover body is equipped with level sensor and is placed in sample chamber；
Scanning means is provided on the outside of the sample chamber；
Threeway one is installed, the threeway one is respectively communicated at the top of sample chamber and liquid on the gas piping of the vacuum pump connection
The gas piping of recycling can, the sample chamber top and liquid recovery tank installs pneumatic operated valve one, pneumatic operated valve two, the vacuum respectively
Pump is passed through the buffering gas tank between vacuum pump and threeway one；
Pneumatic operated valve four and threeway two are installed on the liquid line of the water pump connection, the threeway two is respectively communicated with sample chamber bottom
Portion and liquid recovery tank install pneumatic operated valve three on the liquid line on the liquid recovery tank；
The water pump other end connects threeway three, and threeway three is respectively communicated with water supply tank and liquid recovery tank；
The scanning means is CT scanner or nuclear magnetic resonance device, and accesses independent microsystem；
The temperature control box, vacuum pump, water pump, pneumatic operated valve one, pneumatic operated valve two, pneumatic operated valve three, pneumatic operated valve four, level sensor difference
Microcomputor program controller is accessed, the radial deformation sensor and axial deformation sensor pass through sealed interface one, sealed interface
Two access computer data acquisition systems；
The sample chamber material uses ray or the transparent nonmetallic materials PEEK of electromagnetic wave.
2. a kind of rock sample circulation dry and wet freezing-thawing simulation according to claim 1 and damage deterioration test device, special
Sign is: the liquid line is superhigh molecular weight polyethylene pipe, and sample water is normality water, slightly acidic water or alkalescent water.
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