CN108120644A - The creep test device and method of duct rock sample under a kind of gas pressure - Google Patents
The creep test device and method of duct rock sample under a kind of gas pressure Download PDFInfo
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- CN108120644A CN108120644A CN201711386170.8A CN201711386170A CN108120644A CN 108120644 A CN108120644 A CN 108120644A CN 201711386170 A CN201711386170 A CN 201711386170A CN 108120644 A CN108120644 A CN 108120644A
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
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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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0071—Creep
Abstract
The present invention relates to engineering geology technical field, the creep test device and method of duct rock sample under more particularly to a kind of gas pressure.Creep test device includes specimen appliance system, axial loading system, confining pressure system, air pressure loading system, temperature control system and data collecting system.Wherein, the specimen appliance system contains one of inclination cement mortar interlayer in the lateral center of test specimen；There is the duct for penetrating upper and lower surface in longitudinal direction；Inner surfaces of pores covers one layer of resin film；So as to reach solution confining gas, realizing has the test of creep characteristic of rock under interlayer and air pressure conditions.
Description
Technical field
The present invention relates to engineering geology technical field, the creep examination of duct rock sample under more particularly to a kind of gas pressure
Experiment device and method.
Background technology
The crack rock of sandwich is hydraulic and hydroelectric engineering, mining engineering, railway and highway construction project, civil construction work
The complex dielectrics frequently encountered in the various engineerings such as journey, petroleum works, seafari and Development Engineering.In recent years, countries in the world
Growing day by day to the demand of gaseous fuel, in energy wastage in bulk or weight, natural gas and oil gas have accounted for very big proportion, past gas
Fuel is stored within greatly in the air accumulator of ground, not only takes steel, but also dangerous, economical, and therefore, natural gas Underground gas storage will become must
Right trend.Sweden, the Norway in Northern Europe have possessed more than 200 seat of Large Underground oil gas storehouse, wherein many list storage capacities are more than 1,000,000 vertical
Square rice, for strategic reserves, there is the strategic reserves system of 90 days in France, and there are the oil reserve plan of 1.5 billion cubic meters, day in the U.S.
Originally there is a oil reserve base more than 10, at present, the built underground natural gas storage tank more than 20 in the whole nation, the gas storage that the country has put into operation is in ring
The Bohai Sea, the Yangtze River Delta, southwest, Midwest, northwest, northeast and ALFISOL IN CENTRAL are distributed.Rock cranny in underground natural gas storage tank, especially
It is an important factor for influencing natural gas storage long-term safety, to study duct under gas pressure containing weak intercalated layer in rock mass
The creep properties of rock sample is of great significance topic.
The content of the invention
In order to solve the above technical problem, the present invention provides a kind of creep test dresses of duct rock sample under gas pressure
It puts and method.
Technical proposal that the invention solves the above-mentioned problems is：The creep test dress of duct rock sample under a kind of gas pressure
Put the creep test method with duct rock sample under a kind of gas pressure.
The creep test device of duct rock sample under a kind of gas pressure, including specimen appliance system, axially loaded system
System, confining pressure system, air pressure loading system, temperature control system and data collecting system.
The specimen appliance system contains one of inclination cement mortar interlayer in the lateral center of test specimen；Longitudinal direction penetrates
The duct of upper and lower surface；Inner surfaces of pores covers one layer of resin film.So as to reach solution confining gas, realization has interlayer and air pressure
Under the conditions of creep characteristic of rock test.
The specimen appliance system, it is upper and lower including upper pore pressure platen 29, lower pore pressure platen 28, rock sample 30 and package
The heat-shrink tube 38 of 30 surrounding of pore pressure platen and rock sample.The rock sample 30 is cylinder test specimen, and a diameter of 50mm is high
It spends for 80mm, contains one of inclination cement mortar interlayer 31 in the lateral center of rock sample 30, in the longitudinal direction of rock sample 30
Centre, equipped with the duct 44 for penetrating upper and lower surface together, the thickness of the cement mortar interlayer 31 is 4mm, the duct 44 it is straight
Footpath is 9mm, and the resin film 39 that a thickness is 2mm is scribbled on the inner wall in duct 44, and 44 internal diameter of duct for scribbling resin film 39 is
5mm；A diameter of 50mm of the upper pore pressure platen 29, is highly 80mm, and at the middle part of upper pore pressure platen 29, there are one 7 font holes
Road I45, the open at one end of the 7 font duct I45 are communicated with the opening of the channel of rock sample upper surface, the other end by pipeline with
Air pressure loading device is connected；A diameter of 50mm of the lower pore pressure platen 28, is highly 80mm, at the middle part of lower pore pressure platen 28
There are one 7 font duct II46, the open at one end of the 7 font duct II46 is communicated with the opening of the channel of rock sample lower surface,
The other end is connected by pipeline with voltage-stablizer 40；It is set between rock sample 30 and upper and lower pore pressure platen 29,28 O-shaped together
The surrounding of sealing ring, rock sample 30 and upper and lower pore pressure platen 29,28 is cased with heat-shrink tube 38, is equipped in the center of heat-shrink tube 38
Circumferential extensometer 32 together；
Axle power loading system includes loading axis 25, axial force sensor 23, three axocoels 33, bearing plate 34, pedestal 35.
Confining pressure system includes three axocoels 33 and confining pressure loading system.Filled with silicone oil in three axocoels 33, confining pressure loading is by adding
Oil cylinder 1 is carried to realize.
Air pressure loading system includes pneumatic cylinder 9 and voltage-stablizer 40, and the pneumatic cylinder 9 is connected with upper pore pressure platen 29, described
Voltage-stablizer 40 is connected with lower pore pressure platen 28.
Temperature control system includes heating collar 24, temperature sensor 22.The outer surface that heating collar 24 is located at three axocoels 33 leads to
The wall surface of three axocoels 33 of heating is crossed, the silicone oil temperature in three axocoels is heated using heat transfer, rock sample 30 is heated.
Data collecting system includes the acquisition of air pressure, axial direction and hoop strain, confining pressure, axis pressure and the data such as temperature.
The creep test method of duct rock sample, comprises the following steps under a kind of gas pressure：
(1) making of rock sample.Test specimen is made of upper and lower two sillar with interlayer, and electricity consumption first is drilled in high 100mm, diameter
For the central duct 44 for drilling through an a diameter of 10mm along longitudinal direction and penetrating upper and lower surface of the cylinder rock sample 30 of 50mm, use
Cutting machine transversely slantingly cuts test specimen into two along above-mentioned rock sample 30, obtains inclined two rocks up and down in cross section
Block respectively pastes a resistance strain plate 42 in the inclination cross section of upper and lower two sillar center, and is embedded in cement mortar interlayer
In 31, the stickup is connected by electric wire with computer controller 37；Sandwich material is cement mortar, and match ratio is：Cement：Sand
Son：Water=1:2:0.8；Upper and lower sillar is closed up, the glass bar of the slightly smaller than duct internal diameter of insertion one in duct 44 will be with glass
The upper and lower sillar of glass stick is inserted into a transparent PVC pipe 47, and the diameter of the transparent PVC pipe 47 is straight slightly larger than upper and lower sillar
Footpath, length are longer 5cm than the upper and lower sillar height closed up, and along the longitudinal direction of transparent PVC pipe 47, elongated to open one of width be about 2cm
Slit 41, by upper and lower sillar along 47 longitudinal extension a distance of transparent PVC pipe, a level is generated between upper and lower sillar
Width is the crack 48 of 4mm, is clamped the both ends of transparent PVC pipe 47 with fixture, it is ensured that upper and lower sillar is fixed on transparent PVC pipe
It is motionless in 47.Cement mortar is perfused into the crack 48 between upper and lower sillar by slit 41, and will be in crack 48 with spillikin
Cement mortar puddling it is real, 24 it is small when after transparent PVC pipe 47 is removed, while glass bar from duct is extracted out, rock is tried
Part 30 conserves 28 days into the water, and test specimen takes out from water after 28, and after drying, the aluminium bar of an a diameter of 5mm is inserted into hole
Liquid phenolic resin, the liquid phenolic resin are poured into the crack of the about 2mm between aluminium bar and duct 44 in the center in road 44
A certain amount of curing agent and the colourless accelerating agents of LCC are inside added, treats again to extract aluminium bar out after resin cooling and shaping, in duct 44
Inner wall on form a layer thickness about 2mm resin films 39.
(2) test specimen is installed.The rock sample 30 prepared is placed between upper pore pressure platen 29 and lower pore pressure platen 28, really
Protect the opening of 7 font duct I, II45,46 in upper and lower pore pressure platen 29,28 and the 44 upper and lower surface of duct of rock sample 30
Opening communicates, and one of O-ring seal is set between rock sample 30 and upper and lower pore pressure platen 29,28, then by heat-shrink tube 38
The surrounding of rock sample 30 and upper and lower pore pressure platen 29,28 is sleeved on, wind turbine hot wind uniformly blows 38 surface of heat-shrink tube, until heat
The draw 38 is bonded with the surrounded surface of rock sample 30 and upper and lower pore pressure platen 29,28, by rock sample and upper and lower pore pressure pressure
Disk is placed in together between the upper rigid platen 26 of three axocoels 33 and lower rigid platen 27, in the thermoplastic tube 38 of 30 outsourcing of rock sample
One of circumferential extensometer 32 of center installation, with the circumferential deformation of creep of rock sample during testing experiment 30, while in Yan Yan
Longitudinally mounted one of the Axial extensometer 43 of stone test specimen is deformed with the Axial creep of rock sample during testing experiment 30.
(3) confining pressure and axis pressure are applied.Confining pressure is connected with each pipeline of axis pressure system with the circuit of resistance strain plate 42
It is good, confining pressure value and the size of confining pressure rate of application are set in computer controller 37, after confining pressure application, in computer controller
Axis pressure value and the size of axis pressure rate of application are set in 37, so as to fulfill the application of the confining pressure to rock sample and axis pressure.
(4) air pressure is applied.Each pipeline and circuit of air pressure loading system are connected, the outlet air pressure of pneumatic cylinder 9 is transferred to
Design load is also transferred to design load with by the pressure gauge of voltage-stablizer 44, and gases at high pressure pass through the 7 of upper pore pressure platen 29 in pneumatic cylinder 9
The 7 font duct II46 of font duct I45, the duct 44 of rock sample 30 and lower pore pressure platen 28 are connected with voltage-stablizer 40, really
The air pressure protected in the duct 44 of rock sample 30 is maintained at design load.
(5) test temperature is set.By the temperature value of temperature setting in computer controller 37 to test requirements document, heating collar 24 leads to
The silicone oil temperature in three axocoel 33 of conduction heating is overheated, so that the temperature of rock sample 30 is heated to the temperature of test requirements document
Value.
(6) data acquisition.Holding shaft pressure, confining pressure and temperature-resistant, entire duration of test runs for 90 it is small when, testing
Journey gathers gas pressure, the axial direction of rock sample and hoop strain, confining pressure, axis pressure and data, the sampling interval such as temperature and is in real time
1.0 the second.
The advantageous effect that the present invention generates the prior art is：
Creep test device and method containing vertical duct rock sample under a kind of gas pressure, can complete under gas pressure
The research work of the rock sample creep properties of duct containing interlayer, and due to having one layer of dense resin film in duct inner wall, can be with
Ensure that gas will not leak during creep test.
Description of the drawings
Fig. 1 is apparatus structure schematic diagram.
Fig. 2 is sample system sectional view.
Fig. 3 is cement mortar interlayer preparation method schematic diagram.
Fig. 4 is is 10MPa in confining pressure, and axis pressure is 50MPa, and Pore Pressure is 3MPa and temperature is at 50 DEG C, and crack dip is
Axial strain-time graph of 15 ° of rock sample.
Fig. 5 is is 10MPa in confining pressure, and axis pressure is 50MPa, and Pore Pressure is 3MPa and temperature is at 50 DEG C, and crack dip is
Axial strain-time graph of 30 ° of rock sample.
Fig. 6 is is 10MPa in confining pressure, and axis pressure is 50MPa, and Pore Pressure is 8MPa and temperature is at 50 DEG C, and crack dip is
Axial strain-time graph of 15 ° of rock sample.
In figure：1st, load cylinder, 2, servomotor, 3, retarder, 4, worm drive pair, 5, piston, 6, confining pressure sensor,
7th, flow sensor I, 8, flow sensor II, 9, pneumatic cylinder, 10, air gauge I, 11, air gauge II, 12, valve I, 13, valve
II, 14, valve III, 15, data cable I, 16, data cable II, 17, data cable III, 18, data cable IV, 19, data cable V, 20, number
According to line VI, 21, data cable VII, 22, temperature sensor, 23, axial force sensor, 24, heating collar, 25, loading axis, 26, upper rigidity
Platen, 27 times rigid platens, 28, lower pore pressure platen, 29, upper pore pressure platen, 30, rock sample, 31, cement mortar interlayer, 32,
Circumferential extensometer, 33, three axocoels, 34, bearing plate, 35, pedestal, 36, stiffness bearer, 37, computer controller, 38, heat-shrink tube,
39th, resin film, 40, voltage-stablizer, 41, slit, 42, resistance strain plate, 43, Axial extensometer, 44, duct, 45,7 font holes
Road I, 46,7 font duct II, 47, pvc pipe, 48, crack.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments, but not as the limit to the present invention
It is fixed.
A kind of creep test device containing vertical duct rock sample under gas pressure, including：Specimen appliance system, axial direction
Loading system, confining pressure system, gas pressure loading system, servo-control system and computer controller.
The specimen appliance system includes upper pore pressure platen 29, lower pore pressure platen 28, rock sample 30 and superscribes, lower opening
Press the heat-shrink tube 38 of 30 surrounding of platen and rock sample.The rock sample 30 be cylinder test specimen, a diameter of 50mm, height
For 80mm, contain one of inclination cement mortar interlayer 31 in the lateral center of rock sample 30, rock sample 30 it is longitudinally central,
Equipped with the duct 44 for penetrating upper and lower surface together, the thickness of the cement mortar interlayer 31 is 4mm, the duct 44 it is a diameter of
9mm scribbles the resin film 39 that a thickness is 2mm on the inner wall in duct, and the duct internal diameter for scribbling resin film is 5mm；On described
A diameter of 50mm of pore pressure platen 29 is highly 80mm, described at the middle part of upper pore pressure platen 29 there are one 7 font duct I45
The open at one end of 7 font duct I45 is communicated with the opening of the channel of rock sample upper surface, and the other end is filled by pipeline and air pressure-loading
It puts connected；A diameter of 50mm of the lower pore pressure platen 28, is highly 80mm, and at the middle part of lower pore pressure platen, there are one 7 fonts
Duct II46, the open at one end of the 7 font duct II46 are communicated with the opening of the channel of rock sample lower surface, and the other end passes through pipe
Road is connected with voltage-stablizer 40；One of O-ring seal, rock examination are set between rock sample 30 and upper and lower pore pressure platen 29,28
The surrounding of part 30 and upper and lower pore pressure platen 29,28 is cased with heat-shrink tube 38, in the center of heat-shrink tube 38 equipped with circumferential extensometer together
32；
Axle power loading system includes loading axis 25, axial force sensor 23, bearing plate 34, pedestal 35.Pass through loading axis 25
It moves up and down and rock sample 30 is loaded and unloaded axial stress, the axial force sensor in loading axis 25 examines the size of power
It measures and comes and pass in computer controller 37, loading axis 25 acts on rigid platen 26, by upper pore pressure platen 29, applies axis
Power is to rock sample 30.
Confining pressure system includes three axocoels 33 and confining pressure loading system.Filled with silicone oil in three axocoels 33, confining pressure loading is by adding
Oil cylinder 1 is carried to realize, the instruction that servomotor 2 is sent according to Testing Software is rotated drives worm drive pair 4 by retarder 3
Movement band piston 5 moves along a straight line to adjust in-oil cylinder pressure, and the confining pressure sensor 6 mounted on 1 oil outlet end of load cylinder is examined
Oil pressure is surveyed, is transmitted in computer controller 37, computer controller 37 handles the measuring signal of pressure, and the pressure set
Data are compared, and then provide deviation correcting signal, and the pressure value of application is made to reach unanimity with the pressure value set.
Air pressure loading system includes pneumatic cylinder 9 and voltage-stablizer 40, and the pneumatic cylinder 9 is connected with upper pore pressure platen 29, described
Voltage-stablizer 40 is connected with lower pore pressure platen 28, and the pneumatic cylinder 9 applies air pressure, the voltage-stablizer to the duct 44 of rock sample 30
40 are used for stablizing air pressure in duct 44.
Temperature control system includes heating collar 24, temperature sensor 22.Heating collar 24 by heat three axocoels 33 wall surface,
Silicone oil temperature in three axocoels 33 is heated using heat transfer, rock sample 30 is heated, passes through the monitoring three in real time of temperature sensor 22
Temperature in axocoel 33, and fed back to computer controller 37.
Data collecting system includes air pressure, axial direction and hoop strain, confining pressure, axis pressure, temperature and resistance strain plate 42
Data acquisition is connected with computer controller 37 by flow sensor I 7, monitors barometric information in real time；By axial force sensor with
Computer controller 37 is connected, the size of real-time inspection and control axis pressure, acquisition axis pressure data；It is controlled by confining pressure sensor and computer
Device 37 is connected, and gathers confining pressure in real time, is connected by temperature sensor 22 with computer controller 37, real-time collecting temperature data；It is logical
It crosses Axial extensometer 32 with computer 37 to be connected, gathers the data of axial strain in real time；Pass through Axial extensometer 43 and 37 phase of computer
Even, the data of axial strain are gathered in real time.
Embodiment 1：
The creep test of rock sample containing duct method, comprises the following steps under a kind of gas pressure：
(1) making of rock sample.Test specimen is made of upper and lower two sillar with interlayer, and electricity consumption first is drilled in high 100mm, diameter
For the central duct 44 for drilling through an a diameter of 10mm along longitudinal direction and penetrating upper and lower surface of the cylinder rock sample 30 of 50mm, use
Cutting machine transversely slantingly cuts test specimen into two along above-mentioned rock sample 30, obtains inclined two rocks up and down in cross section
Block, the angle of inclination in the cross section is 15 °, one resistance-type strain of each stickup in the inclination cross section of upper and lower two sillar center
Piece 42, and be embedded in cement mortar interlayer 31, the stickup is connected by electric wire with computer controller 37；Sandwich material is water
Cement mortar, match ratio are：Cement is using 425 portland cements in cement mortar, and sand is grain size in 0.08mm
Following river sand is 1 by volume cement, sand and water:2:0.8 ratio prepares；Upper and lower sillar is closed up, in duct 44
The glass bar of interior insertion one slightly smaller than duct internal diameter, the upper and lower sillar with glass bar is inserted into a transparent PVC pipe 47,
The diameter of the transparent PVC pipe 47 is slightly larger than the diameter of upper and lower sillar, and length is longer than the upper and lower sillar height closed up
5cm opens the slit 41 that one of width is about 2cm along 47 longitudinal direction of transparent PVC pipe is elongated, upper and lower sillar is indulged along transparent PVC pipe 47
To pulling open a distance, the crack 48 that a horizontal width is 4mm is generated between upper and lower sillar, with fixture by transparent PVC pipe
It clamps at 47 both ends, it is ensured that upper and lower sillar is fixed on motionless in transparent PVC pipe 47.Cement mortar perfusion is arrived by slit 41
In crack 48 between upper and lower sillar, and with spillikin that the cement mortar puddling in crack is real, 24 it is small when after by transparent PVC pipe
47 remove, while glass bar is extracted out from duct, rock sample 30 are conserved 28 days into the water, test specimen takes from water after 28
Go out, after drying, the aluminium bar of an a diameter of 5mm is inserted into the center in duct 44, the about 2mm's between aluminium bar and duct 44
Liquid phenolic resin is poured into crack, a certain amount of curing agent and the colourless accelerating agents of LCC are added in the liquid phenolic resin,
It treats again to extract aluminium bar out after resin cooling and shaping, a layer thickness about 2mm resin films 39 is formd on the inner wall in duct 44.
(2) test specimen is installed.The rock sample 30 prepared is placed between upper pore pressure platen 29 and lower pore pressure platen 28, really
Protect the opening of 7 font duct I, II45,46 in upper and lower pore pressure platen 29,28 and the 44 upper and lower surface of duct of rock sample 30
Opening communicates, and one of O-ring seal is set between rock sample 30 and upper and lower pore pressure platen 29,28, then by heat-shrink tube 38
The surrounding of rock sample 30 and upper and lower pore pressure platen 29,28 is sleeved on, wind turbine hot wind uniformly blows 38 surface of heat-shrink tube, until heat
The draw 38 is bonded with the surrounded surface of rock sample 30 and upper and lower pore pressure platen 29,28, by rock sample and upper and lower pore pressure pressure
Disk is placed in together between the upper rigid platen 26 of three axocoels 33 and lower rigid platen 27, in the heat-shrink tube 38 of 30 outsourcing of rock sample
One of circumferential extensometer 32 of center installation, with the circumferential deformation of creep of rock sample during testing experiment 30, while in Yan Yan
Longitudinally mounted one of the Axial extensometer 43 of stone test specimen is deformed with the Axial creep of rock sample during testing experiment 30.
(3) confining pressure and axis pressure are applied.Confining pressure and the circuit of each pipeline and resistance strain gage 42 of axis pressure system are connected,
It is 10MPa, rate of application 0.05MPa/s that confining pressure is set in computer controller, after confining pressure applies, in computer controller
Middle setting axis is pressed as 50MPa, rate of application 0.05MPa/s.
(4) air pressure is applied.Each pipeline and circuit of air pressure loading system are connected, the outlet air pressure of pneumatic cylinder 9 is transferred to
3MPa is also transferred to 3MPa, the 7 font holes that gases at high pressure pass through upper pore pressure platen in pneumatic cylinder 9 with by pressure gauge on voltage-stablizer 40
The 7 font ducts in road, the medium pore canal of rock sample containing sandwich cylinder and lower pore pressure platen are connected with voltage-stablizer, it is ensured that containing interlayer
Air pressure in cylinder rock sample medium pore canal is maintained at 3MPa.
(5) test temperature is set.Set temperature is 50 DEG C in computer controller 37, and heating collar 24 is heated by heat transfer
Rock sample 30 is heated to 50 DEG C by the silicone oil temperature in three axocoels 33 up to temperature.
(6) data acquisition.Holding shaft pressure, confining pressure and temperature-resistant, entire duration of test runs for 90 it is small when, testing
Journey gathers gas pressure, the axial direction of test specimen and hoop strain, confining pressure, axis pressure and the data such as temperature, sampling interval 1.0 in real time
Second.
Fig. 4 is is 10MPa in confining pressure, and axis pressure is 50MPa, and Pore Pressure is 3MPa and temperature is at 50 DEG C, and crack dip is
Axial strain-time graph of 15 ° of rock sample.
Embodiment 2：
Each implementation steps are substantially the same with embodiment 1.The difference is that：It is horizontal along above-mentioned rock sample 30 with cutting machine
To obliquely cutting test specimen into two, inclined two sillars up and down in cross section are obtained, the angle of inclination in the cross section is
30°。
Fig. 5 is is 10MPa in confining pressure, and axis pressure is 50MPa, and Pore Pressure is 3MPa and temperature is at 50 DEG C, and crack dip is
Axial strain-time graph of 30 ° of rock sample.
Embodiment 3：
Each implementation steps are substantially the same with embodiment 1.The difference is that：The outlet air pressure of pneumatic cylinder 9 is transferred to
8MPa is also transferred to 8MPa with by pressure gauge on voltage-stablizer.
Fig. 6 is is 10MPa in confining pressure, and axis pressure is 50MPa, and Pore Pressure is 8MPa and temperature is at 50 DEG C, and crack dip is
Axial strain-time graph of 15 ° of rock sample.
Claims (8)
1. the creep test device of duct rock sample under a kind of gas pressure, which is characterized in that the device realizes gas pressure
The creep test of lower duct rock sample；
The creep test device includes specimen appliance system, axial loading system, confining pressure system, air pressure loading system, temperature
Control system and data collecting system.
2. creep test device according to claim 1, which is characterized in that the test specimen of the specimen appliance system is in transverse direction
Longitudinally there is the duct for penetrating upper and lower surface in center containing cement mortar interlayer is tilted together, and inner surfaces of pores covers one layer of resin
Film.
3. creep test device according to claim 2, which is characterized in that the specimen appliance system includes upper pore pressure pressure
It disk 29, lower pore pressure platen 28, rock sample 30 and superscribes, the heat-shrink tube 38 of 30 surrounding of lower pore pressure platen and rock sample；Institute
Rock sample 30 is stated as cylinder test specimen, a diameter of 50mm is highly 80mm, contains one in the lateral center of rock sample 30
Road tilts cement mortar interlayer 31, rock sample 30 it is longitudinally central, equipped with the duct 44 for penetrating upper and lower surface together, the water
The thickness of cement mortar interlayer 31 is 4mm, a diameter of 9mm in the duct 44, and a thickness is scribbled on the inner wall in duct 44 as 2mm
Resin film 39, scribble resin film 39 44 internal diameter of duct be 5mm；A diameter of 50mm of the upper pore pressure platen 29 is highly
80mm, at the middle part of upper pore pressure platen 29, there are one 7 font duct I45, the open at one end and rock of the 7 font duct I45
The opening of the channel of test specimen upper surface communicates, and the other end is connected by pipeline with air pressure loading device；The lower pore pressure platen 28 it is straight
Footpath is 50mm, is highly 80mm, and at the middle part of lower pore pressure platen 28, there are one 7 font duct II46, the 7 font duct II46
Open at one end communicated with the opening of the channel of rock sample lower surface, the other end is connected by pipeline with voltage-stablizer 40；It is tried in rock
One of O-ring seal, rock sample 30 and upper and lower pore pressure platen 29,28 are set between part 30 and upper and lower pore pressure platen 29,28
Surrounding be cased with heat-shrink tube 38, in the center of heat-shrink tube 38 equipped with circumferential extensometer 32 together.
4. creep test device according to claim 1, which is characterized in that the axle power loading system includes loading axis
25th, axial force sensor 23, three axocoels 33, bearing plate 34, pedestal 35.
5. creep test device according to claim 1, which is characterized in that the confining pressure system includes three axocoels 33 with enclosing
Press loading system；It is realized in three axocoels 33 filled with silicone oil, confining pressure loading by load cylinder 1.
6. creep test device according to claim 1, which is characterized in that the air pressure loading system includes pneumatic cylinder 9
With voltage-stablizer 40, the pneumatic cylinder 9 is connected with upper pore pressure platen 29, and the voltage-stablizer 40 is connected with lower pore pressure platen 28.
7. creep test device according to claim 1, which is characterized in that the temperature control system includes heating collar
24th, temperature sensor 22；Heating collar 24 is located at the outer surface of three axocoels 33 by the wall surface of three axocoels 33 of heating, utilizes heat transfer
The silicone oil temperature in three axocoels is heated, rock sample 30 is heated.
8. creep test device according to claim 1, which is characterized in that the data collecting system includes air pressure, axis
To the acquisition with hoop strain, confining pressure, axis pressure and temperature data.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711386170.8A CN108120644B (en) | 2017-12-20 | 2017-12-20 | Creep test device of pore rock test piece under atmospheric pressure effect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711386170.8A CN108120644B (en) | 2017-12-20 | 2017-12-20 | Creep test device of pore rock test piece under atmospheric pressure effect |
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| CN108120644B CN108120644B (en) | 2020-06-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109342201A (en) * | 2018-11-07 | 2019-02-15 | 湖南科技大学 | Rock closing crack hydraulic pressure transient changing test device and method under shock loading |
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