CN105181469B - A kind of naked triaxial compression test device of rock and test method - Google Patents

A kind of naked triaxial compression test device of rock and test method Download PDF

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Publication number
CN105181469B
CN105181469B CN201510543941.4A CN201510543941A CN105181469B CN 105181469 B CN105181469 B CN 105181469B CN 201510543941 A CN201510543941 A CN 201510543941A CN 105181469 B CN105181469 B CN 105181469B
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China
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rock
container
airbag
hole
compression test
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CN201510543941.4A
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Chinese (zh)
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CN105181469A (en
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马洪岭
杨春和
施锡林
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中国科学院武汉岩土力学研究所
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Publication of CN105181469A publication Critical patent/CN105181469A/en
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Abstract

The invention discloses a kind of naked triaxial compression test device of rock and test method, it is related to the strength characteristics technical field that solid material is tested with mechanical stress.In use, it is integrally placed in triaxial chamber, it includes container, airbag, communicating pipe, piston, and bare core sample is placed in container, and container is connected by communicating pipe with airbag.Engineering fluid is injected in container, so that sample is directly contacted with engineering fluid, high pressure is passed to engineering fluid by the high pressure liquid force feed of triaxial chamber by airbag, so that high pressure engineering fluid is directly and sample contacts, to carry out naked triaxial test, near field mechanical character of surrounding rock can be simulated, provides and more accurately services for engineering stability evaluation.Further, since molten chamber and airbag separate engineering fluid with hydraulic oil, pressure balance between cavity volume and triaxial chamber, and have sealing, therefore, in process of the test, engineering fluid can be avoided to be mixed with hydraulic oil, also be avoided that avalanche sample at random enters among hydraulic oil.

Description

A kind of naked triaxial compression test device of rock and test method

Technical field

The present invention relates to the strength characteristics technical field that solid material is tested with mechanical stress, more particularly to a kind of rock Naked triaxial compression test device and test method.

Background technology

Rock triaxial compression test, is the important tests for obtaining rock mechanics parameters.In order to being applied on rock ring direction Plus confined pressure, it is general to be pressurizeed using aircraft fluid, and wear one layer of clothes on cylindrical sample surface, that is, add a set of heat-shrink tube (film) or rubber case, prevent hydraulic oil and core sample from directly contacting.For example, application publication number is the A's of CN 103344496 Chinese invention patent discloses a kind of rock triaxial compression-water (gas) coupling device and test method, referring to accompanying drawing 1, the device , can including axle pressure servo-drive system, confined pressure servo-drive system, water (gas) pressure servo-drive system, data collecting system and data handling system Carry out hydrostatic compression, triaxial compressions overall process and add the stress-seepage coupling experiment unloaded under circulation., can be with from the accompanying drawing 1 Find out, the ring of core sample 18 is wrapped up by rubber case 17.So the pressure of hydraulic oil can be directly delivered to and tightly be wrapped in rock In the heart on the rubber case 17 in face, then rubber case 17 passes to core sample 18 again, and such benefit is that high pressure liquid force feed will not Infilter among the crack occurred in the compression process of core sample 18, and cause the unexpected avalanche of core sample.

However, in many engineerings, the surface of rock is directly contacted with highly pressurised liquid or gas.Such as, reservoir it In, vertical tens meters even up to a hundred meters of hydraulic pressure is directly in contact with reservoir area rock;Furthermore, among salt hole air reserved storeroom, high pressure day Right gas is directly contacted with salt cave country rock;For another example, in the storage tank farm of salt cave, high pressure crude oil and salt cave confined pressure direct interaction.Therefore, The mechanical characteristic of the near field confined pressure of core sample 18 can not accurately be simulated using the rock triaxial compression test device.

The content of the invention

In view of this, the present invention provides a kind of naked triaxial compression test device of rock and test method, and it enables to red Naked core sample directly contacts engineering fluid;In process of the test, engineering fluid can be avoided to be mixed with hydraulic oil, so that smart Quasi- simulation core sample near field confined pressure mechanical characteristic, provides for engineering stability evaluation and more accurately services;It can also keep away Exempt from engineering fluid to mix with hydraulic oil, be also avoided that avalanche sample at random enters among hydraulic oil, thus more suitable for practicality.

In order to achieve the above object, present invention generally provides following technical scheme:

The naked triaxial compression test device of rock that the present invention is provided, using when, it is integrally placed in triaxial chamber, the rock Naked triaxial compression test device includes container, airbag, communicating pipe, piston,

Cavity volume is provided with the container, bare core sample is placed in the cavity volume,

The cover plate of the container is provided with first through hole, and the piston is arranged in the first through hole, the piston with Sealing is combined together between the cover plate of the container,

The airbag is connected by the communicating pipe with the cavity volume,

The volume of the airbag is at least 500 times of the communicating pipe volume.

The object of the invention to solve the technical problems can be also applied to the following technical measures to achieve further.

Preferably, the naked triaxial compression test device of rock also includes push-down head, one end of the push-down head is fixed The core sample body bottom portion is connected to, the other end of the push-down head offers blind hole, and the chassis of the container is provided with Alignment pin, the specification of the blind hole is corresponding with the specification of the alignment pin, the core sample body by the blind hole with The cooperation of the alignment pin is placed in the container.

Preferably, the naked triaxial compression test device of rock also includes seaming chuck, one end of the seaming chuck is fixed The core sample bodies top is connected to, the other end of the seaming chuck is used as pressure loading end.

Preferably, the cover plate of the container, chassis, side wall split, the side wall are cylindrical, the cover plate, chassis Seal and coordinate between the side wall.

Preferably, the naked triaxial compression test device of rock also includes upper Ring like suction disc, lower Ring like suction disc, the lid Plate is coordinated by being sealed between the upper Ring like suction disc and the top side wall, and the chassis passes through the lower Ring like suction disc and institute Sealing coordinates between stating sidewall bottom.

Preferably, the naked triaxial compression test device of rock also includes first seal, the side wall bottom of the container Portion offers the second through hole, and the first seal is removably attachable to second through hole.

Preferably, the naked triaxial compression test device of rock also includes second seal, the 3rd seal, the lid Plate is provided with third through-hole, fourth hole, and the third through-hole is used for the injection of engineering fluid, and the fourth hole is used to connect The communicating pipe,

The second seal is removably attachable to the third through-hole,

3rd seal is removably attachable to the fourth hole, and the 3rd seal center offers the 5th Through hole, is sealed and coordinated the communicating pipe by outer wall and the fifth hole.

Preferably, the side wall is made up of transparent material.

Preferably, outside the outer most edge for the cover plate that the communicating pipe outermost end reaches the container.

Preferably, when the top of the piston and the core sample is completely attached to, the top land and cover plate it Between distance at least be 10cm.

Preferably, the naked triaxial compression test device of rock also includes rubber band, the airbag passes through the rubber It is sealed connected together between muscle and the communicating pipe.

Preferably, the cover plate and chassis are made up of stainless steel.

Preferably, the side wall is made up of organic resin glass.

Preferably, the upper Ring like suction disc and lower Ring like suction disc are made up of quality of rubber materials respectively.

Preferably, the first seal, second seal, the 3rd seal are made up of quality of rubber materials.

Preferably, the naked triaxial compression test device of rock also includes O-ring, the O-ring is connected to the work Between plug and the cover plate.

The naked triaxial compression test method of rock that the present invention is provided, the naked triaxial compression test of rock provided based on the present invention Device and realize, the naked triaxial compression test method of rock comprises the following steps:

Core sample is positioned in the container,

Press piston so that the top of the piston and core sample is completely attached to,

Engineering fluid is filled into the container,

The airbag that will be filled with gas is connected to the communicating pipe,

Device Jing Guo above-mentioned assembling is integrally placed in triaxial chamber,

Hydraulic oil is filled with into the triaxial chamber,

Experiment is carried on according to existing rock triaxial compression test method, with the hydraulic pressure in the triaxial chamber Gradually increase, the gas in the airbag is gradually compressed in airbag, make the volume-diminished of the airbag,

Apply pressure to the piston, the pressure born with the piston gradually increases, and the piston is relative to described The cover plate of container is moved down, and ties up the engineering fluid in the container, and the engineering fluid of volume suitable with by volume is tied up leads to Cross and the communicating pipe be transferred to the airbag;

After experiment terminates, the hydraulic oil in the triaxial chamber is discharged, the airbag is re-inflated;

The triaxial chamber is opened, the engineering fluid in the container is discharged.

The naked triaxial compression test device of rock and test method that the present invention is provided are in use, it is integrally placed at triaxial chamber Interior, it includes being provided with cavity volume in container, airbag, communicating pipe, piston, container, and bare core sample is placed in cavity volume, container Cover plate be provided with first through hole, piston is arranged in first through hole, and sealing is combined together between piston and the cover plate of container, Airbag is connected by communicating pipe with cavity volume, and the volume of airbag is at least 500 times of communicating pipe volume.Hydraulic oil is filled with to triaxial chamber After when pressurizeing, according to gas is compressible, the incompressible property of liquid, the gas in airbag is compressed, and volume reduces, according to gram La Bailong equation P V=nRT, in the case where n, R, T are constant, V reduces then P and increased, so that by the gas in airbag to container In engineering fluid apply active force, because engineering fluid directly contacts bare core sample, therefore, equivalent to the active force Act directly on bare core sample, be engineering therefore, it is possible to accurately simulation core sample near field confined pressure mechanical characteristic Estimation of stability is provided and more accurately serviced.Further, since engineering fluid is placed in the cavity volume of container, and hydraulic oil is accommodating In in triaxial chamber, sealed off between the cavity volume and triaxial chamber of container, therefore, in process of the test, engineering fluid can be avoided Mixed with hydraulic oil.Further, since the volume of airbag is at least 500 times of communicating pipe volume, even if hydraulic oil provides 50MPa's Gas in pressure, airbag will not still be pressed into communicating pipe, and then enter the cavity volume of the container, the rock that the influence present invention is provided The result accuracy of the naked triaxial compression test device of stone.

Brief description of the drawings

By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit is common for this area Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings:

Fig. 1 be a kind of rock triaxial compressions disclosed in Chinese invention patent that application publication number is the A of CN 103344496- The structural representation of water (gas) coupling device;

Fig. 2 is the structural representation of the naked triaxial compression test device of rock provided in an embodiment of the present invention (wherein, in airbag It is not inflated, or, the airbag that airbag has been collapsed into flat by the hydraulic oil in triaxial chamber);

Fig. 3 is loading seaming chuck for the rock core applied in the naked triaxial compression test device of rock provided in an embodiment of the present invention With the structural representation after push-down head;

Fig. 4 is the structure for the side wall of container applied in the naked triaxial compression test device of rock provided in an embodiment of the present invention Schematic diagram;

Fig. 5 be in Fig. 4 M-M to sectional drawing;

The front view structure on chassis of the Fig. 6 to be applied in the naked triaxial compression test device of rock provided in an embodiment of the present invention is shown It is intended to;

The plan structure on chassis of the Fig. 7 to be applied in the naked triaxial compression test device of rock provided in an embodiment of the present invention is shown It is intended to;

Fig. 8 be in the naked triaxial compression test device of rock provided in an embodiment of the present invention the cover plate applied loading piston it Main structure diagram afterwards;

Fig. 9 lives for the cover plate applied in the naked triaxial compression test device of rock provided in an embodiment of the present invention in no loading Dimensional structure diagram during plug, wherein, second seal is free on outside cover plate;

Figure 10 connects for the airbag applied in the naked triaxial compression test device of rock provided in an embodiment of the present invention in loading Structural representation after pipe, the 3rd seal;

Figure 11 is the step flow chart of the naked triaxial compression test method of rock provided in an embodiment of the present invention.

Embodiment

The present invention can not accurately simulate the mechanical characteristic of core sample near field confined pressure for what solution prior art was present The problem of there is provided a kind of naked triaxial compression test device of rock and test method, it enables to bare core sample direct Contact engineering fluid;In process of the test, engineering fluid can be avoided to be mixed with hydraulic oil, so that accurately simulation core sample Near field confined pressure mechanical characteristic, provides for engineering stability evaluation and more accurately services;Engineering fluid and hydraulic pressure can also be avoided Oil mixing, is also avoided that avalanche sample at random enters among hydraulic oil, thus more suitable for practicality.

Referring to accompanying drawing 2~10, the naked triaxial compression test device of rock provided in an embodiment of the present invention is in use, its entirety It is placed in triaxial chamber, the naked triaxial compression test device of rock is included in container 21, airbag 14, communicating pipe 13, piston 9, container 21 Provided with cavity volume 18, bare core sample is placed in cavity volume 18, and the cover plate 8 of container 21 is provided with first through hole 11, and piston 9 is worn In first through hole 11, seal and be combined together between the cover plate 8 of piston 9 and container 21, airbag 14 by communicating pipe 13 with Cavity volume 18 is connected, and the volume of airbag 14 is at least 500 times of the volume of communicating pipe 13.

The naked triaxial compression test device of rock provided in an embodiment of the present invention to triaxial chamber in use, be filled with after hydraulic oil During pressurization, according to gas is compressible, the incompressible property of liquid, the gas in airbag 14 is compressed, and volume reduces, according to gram La Bailong equation P V=nRT, in the case where n, R, T are constant, V reduces then P and increased, so that by the gas in airbag 14 to holding Engineering fluid in device 21 applies active force, because engineering fluid directly contacts bare core sample, therefore, equivalent to the work Firmly act directly on bare core sample, therefore, it is possible to accurately simulation core sample near field confined pressure mechanical characteristic, be Engineering stability evaluation is provided and more accurately serviced.Further, since engineering fluid is placed in the cavity volume 18 of container 21, and liquid Force feed is placed in triaxial chamber, is sealed off between the cavity volume 18 and triaxial chamber of container 21, therefore, can in process of the test Engineering fluid is avoided to be mixed with hydraulic oil.Further, since the volume of airbag 14 is at least 500 times of communicating pipe volume, even if liquid The gas that force feed is provided in 50MPa pressure, airbag 14 will not still be pressed into communicating pipe 13, and then enter the appearance of the container 21 Chamber 18, the result accuracy for the naked triaxial compression test device of rock that the influence present invention is provided.

The object of the invention to solve the technical problems can be also applied to the following technical measures to achieve further.

Wherein, the naked triaxial compression test device of the rock also includes push-down head 16b, and push-down head 16b one end is fixedly connected In the bottom of core sample body 15, the push-down head 16b other end is offered to be set on blind hole (not shown), the chassis of container 21 There is alignment pin 3, the specification of blind hole (not shown) is corresponding with the specification of alignment pin 3, and core sample body 15 passes through blind hole (not shown) and the cooperation of alignment pin 3 are placed in container 21.In this case, blind hole (not shown) and positioning The cooperation of pin 3 can make core sample in the bottom precise positioning of container 21 first;Furthermore, when the engineering fluid in container 21 by During gas high pressure in airbag 14, core sample will not be moved, or topple over, be moved when core sample or When toppling over, the contact surface of piston 9 and core sample is difficult to be guaranteed, and even results in whole triaxial compression test and fails comprehensively.

Wherein, the naked triaxial compression test device of rock also includes seaming chuck 16a, and seaming chuck 16a one end is fixedly connected on The top of core sample body 15, the seaming chuck 16a other end is used as pressure loading end, and in this case, seaming chuck 16a's is upper Surface can be made to very smooth by processing technology, during as pressure loading end, can be avoided the occurrence of except vertical direction Outside remaining direction component so that test data is more accurate.

Wherein, the cover plate 8 of container 21, chassis 1, the split of side wall 4, side wall 4 are cylindrical, cover plate 8, chassis 1 and side wall 4 it Between seal and coordinate, in this case, cover plate 8, chassis 1, side wall 4 can be molded respectively, according to different to container 21 in experiment The respective more suitable material of demand selection at position.

Wherein, the naked triaxial compression test device of rock also includes upper Ring like suction disc 5a, lower Ring like suction disc 5b, and cover plate 8 passes through Seal and coordinate between the upper top of Ring like suction disc 5a and side wall 4, chassis 1 between lower Ring like suction disc 5b and the bottom of side wall 4 by sealing Coordinate.

Wherein, the naked triaxial compression test device of rock also includes first seal 7, and the bottom of side wall 4 of container 21 is offered Second through hole 6, first seal 7 is removably attachable to the second through hole 6, on second through hole 6 and the work of first seal 7 With referring to hereinafter.

Wherein, cover plate 8 is provided with third through-hole 10a, fourth hole 10b, second seal 20, the 3rd seal 12, the Three through hole 10a are used for the injection of engineering fluid, and fourth hole 10b is used to connect pipe 13, and second seal 20 is removably Third through-hole 10a is connected to, the 3rd seal 12 is removably attachable to fourth hole 10b, and the center of the 3rd seal 12 is opened up There is fifth hole (not shown), sealed communicating pipe 13 and coordinated by outer wall and fifth hole (not shown).

Wherein, side wall 4 is made up of transparent material, consequently facilitating being grasped to state of the core sample in container 21.

Wherein, the outermost end of communicating pipe 13 is reached outside the outer most edge of cover plate 8 of container 21, consequently facilitating the company of airbag 14 Connect.

Wherein, piston 9 is pressed on seaming chuck 16a, core sample body 15, push-down head the 16b chassis for being assembled into container 21, made Obtain piston 9 to contact with seaming chuck 16a, the distance of the upper end of piston 9 and cover plate 8 is minimum 10cm.Because piston 9 will by testing machine to Push, typically most long also just pressure 10cm, setting 10cm is in order to avoid piston is fully pressed into container 21.

Wherein, the naked triaxial compression test device of the rock also includes rubber band 17, and airbag 14 is by rubber band 17 with connecting It is sealed connected together between pipe 13, so as to ensure the sealing for the connected space that the cavity volume 18 of container 21 is constituted with airbag 14 Energy.

Wherein, cover plate 8 and chassis 1 are made up of stainless steel.

Wherein, side wall 4 is made up of organic resin glass.

Wherein, upper Ring like suction disc 5a and lower Ring like suction disc 5b are made up of quality of rubber materials respectively.

Wherein, first seal 7, second seal 20, the 3rd seal 12 are made up of quality of rubber materials, and rubber is one in itself Kind of damping material, the first seal 7 being made of it, second seal 20, the 3rd seal 12 itself and the second through hole 6, the There is larger frictional force, so as to ensure first seal 7, second seal 20, the between three through hole 10a, fourth hole 10b The sealing effectiveness of three seals 12.

Wherein, the naked triaxial compression test device of the rock also includes O-ring (not shown), and O-ring (does not show in figure Go out) it is connected between piston 9 and cover plate 8, so as to ensure the sealing property between piston 9 and cover plate 8.

The naked triaxial compression test method of rock provided referring to accompanying drawing 11, the present invention, the rock provided based on the present invention is naked Triaxial compression test device and realize, the naked triaxial compression test method of rock comprises the following steps:

Core sample is positioned in container 21,

Press piston 9 so that piston is completely attached to seaming chuck 16a,

Engineering fluid is filled into container 21,

The airbag 14 that will be filled with gas is connected to communicating pipe 13,

Device Jing Guo above-mentioned assembling is integrally placed in triaxial chamber,

Hydraulic oil is filled with into triaxial chamber,

Experiment is carried on according to existing rock triaxial compression test method, with the hydraulic pressure in triaxial chamber gradually Gas in increase, airbag 14 is gradually compressed in airbag, makes the volume-diminished of airbag 14,

Apply pressure to piston 9, the pressure born with piston 9 gradually increases, cover plate 8 of the piston 9 relative to container 21 Move down, tie up the engineering fluid in container 21, the engineering fluid of volume suitable with by volume is tied up passes through 13 turns of communicating pipe Move to airbag 14;

After experiment terminates, the hydraulic oil in release triaxial chamber, airbag is re-inflated;

Open the engineering fluid in triaxial chamber, release container 21.

Further to illustrate the present invention to reach the technological means and effect that predetermined goal of the invention is taken, below in conjunction with Accompanying drawing and preferred embodiment, to according to the naked triaxial compression test device of rock proposed by the present invention and test method, it is specific real Mode, structure, feature and its effect are applied, is described in detail as after.In the following description, different " embodiment " or " embodiment " What is referred to is not necessarily same embodiment.In addition, the special characteristic, structure or feature in one or more embodiments can be closed by any Conformal formula combination.

The terms "and/or", only a kind of incidence relation for describing affiliated partner, represents there may be three kinds of passes System, for example, A and/or B, is specifically interpreted as:A and B can be included simultaneously, can be with individualism A, can also individualism B, can possess above-mentioned three kinds of any situations.

Embodiment

Purpose provided in an embodiment of the present invention is that providing a kind of highly pressurised liquid of evaluating acts on lower rock mechanics The naked triaxial compression test method of rock, and provide corresponding experiment corollary apparatus.

Naked triaxial compression test, that is, remove the protective case (heat-shrink tube) of rock surface in common triaxial compression test so that Core sample is directly contacted with high pressure engineering liquid, discloses the mechanical characteristic under rock interacts with highly pressurised liquid.Naked three axle Being smoothed out of compression test must have supporting experimental rig, and the present invention intends providing naked triaxial test operating method and corresponding Test corollary apparatus.

Carry out naked triaxial test and the indirect protective case (heat-shrink tube) for removing core sample surface is so simple, first face What is faced is that to apply confined pressure in laboratory is aircraft fluid, and in engineering-environment, it may be possible to water, it may be possible to crude oil, Air is likely to be, but the hydraulic mechanism of testing machine system can not at will change pressure medium.Second problem be as Fruit highly pressurised liquid is directly contacted with sample, in sample pressure process, it may appear that crackle, crack, and highly pressurised liquid is not being protected Sheath can be directly entered these crackle cracks in the case of hindering, and directly result in the avalanche of sample, the rock particles of collapse or The constraint that powder does not have protective case directly can be scattered in hydraulic oil, now, if contaminated hydraulic oil is returned into testing machine Receive internal system, it will testing machine is had adverse effect on, if corrosive sample, such as rock salt, it will the whole examination of corrosion Machine is tested, because almost all of testing machine is not stainless steel, therefore it is necessary to prevent the rock test being scattered from entering hydraulic pressure Oil recovery system.

In order to realize above-mentioned task objective, the present invention uses following technical measures:

Test principle:

In order to realize the interaction of rock core and engineering fluid, and the premise of testing machine integrated hydraulic system is not changed Under, plan increases the naked triaxial compression test device of a rock in triaxial chamber, and engineering fluid, container 21 and three are injected into container 21 Axle room is connected by gas, and gas can be by the pressure transmission in triaxial chamber to the engineering fluid in container 21, and engineering fluid is straight Connect and act on core sample (16a-15-16b).Also all it is in container 21 even if core sample (16a-15-16b) avalanche is scattered Interior, the engineering fluid in container 21 will not also flow to outside container 21 and pollute aircraft fluid.The arrangement achieves three functions:

1) engineering fluid is directly contacted with core sample (16a-15-16b);

2) engineering fluid will not be flowed to outside device outside, will not pollute the aircraft fluid of hydraulic system;

3) rock core will not also pollute corrosion test platform even if being scattered.

The naked triaxial compression test corollary apparatus of rock provided in an embodiment of the present invention, including chassis 1, transparent extraction formula cylinder Side wall 4, cover plate 8.Its annexation is:The One On The Chassis absorption chassis is connected with Ring like suction disc 5b under rubber, and annular is inhaled under rubber Disk 5b is connected with the lower end of transparent cylinder side wall 4, and the second through hole 6 is left in the bottom of transparent cylinder side wall 4, and the second through hole 6 is with being used as the The solid rubber plug that one seal 7 is used is connected, and the upper end of transparent cylinder side wall 4 is connected with Ring like suction disc 5a on rubber, on rubber Ring like suction disc 5a is connected with cover plate 8, is connected in the middle of cover plate 8 with piston 9, is sealed between cover plate 8 and piston 9 using rubber o-ring (not shown).Cover plate 8 is provided with third through-hole 10a, fourth hole 10b, and third through-hole 10a is used to inject engineering liquid, Fourth hole 10b be used for the gas connection in airbag 14, label 19 be communicating pipe 13 gas vent, third through-hole 10a with It is connected as the solid rubber plug of second seal 20, fourth hole 10b and the rubber stopper phase with holes as the 3rd seal 12 Even, it is connected as the rubber stopper with holes and a U-tube as communicating pipe 13 of the 3rd seal 12, U-tube and an airbag 14 are connected.The core sample with seaming chuck 16a, push-down head 16b is placed on the One On The Chassis rock core pallet 2, by alignment pin 3 with Blind locating holes (not shown) positioning on pressure head 16b.

The size of whole device, it is desirable to which maximum outside diameter is less than the internal diameter of triaxial chamber, maximum height is less than triaxial chamber inside wall height, Meet the two it is necessary under the conditions of, can (rock core includes according to the size of rock core ) separately design size.

The diametric requirements of rock core pallet 2 are more than or equal to the diameter of core sample push-down head 16b and core sample body 15;

The size requirement of piston 9 is more than or equal to core sample seaming chuck 16a, push-down head 16b maximum gauge.It is required that living The height of plug 9 is in compacting after rock core seaming chuck 16a, and the upper end of piston 9 also has 10cm or so height apart from cover plate 8.

The second through hole 6 effect of the bottom of transparent cylinder side wall 4 has two, and one is to open the second through hole 6 after the completion of testing Engineering liquid inside releasing;Two be that the connecting line of deformeter on core sample will be by the second through hole 6 and tester base Interface is connected.Connecting line is passed through after the second through hole, and the solid rubber plug for being used as first seal 7 is clogged, because rubber Elasticity is plugged with, connecting line can be tightly wrapped, and the pressure of the internal pressure of container 21 is consistent, it is not necessary to special seal, so will not Pass through the engineering liquid in the second through hole leakage device.

U-tube material requirements organic resin glass, external diameter will can with as the 3rd seal 12 rubber stopper with holes cooperation, The endoporus of the rubber stopper with holes can neither be less than, again can not be too big so that U-tube is inserted into rubber stopper with holes, and can be tight Close combination.The base section length requirement of U-tube is more than the distance that cover plate 8 arrives edge, can stretch the other end of U-tube To the outer rim of cover plate 8, convenient connection airbag 14.

The shape need of airbag 14 is flat, is conducive to reducing the size of package unit;The material requirements transparent plastic of airbag 14, Airbag 14 oral area position requires flexible rubber band 17, can directly lock ring in U-tube side;The requirement of the initial volume of airbag 14 is more than U 500 times of shape pipe volume, because when triaxial chamber pressurizes, the volume of airbag 14 can be compressed with triaxial chamber pressure rise, When triaxial chamber pressure reaches 50MPa, gas volume will be compressed to 1/500, if the initial volume of airbag 14 is more than U-shaped 500 times of pipe volume, airbag 14 would not be compressed into U-tube, the air that can be only pressed dry in airbag 14, as one Flat airbag.

The effect of airbag 14 has two:

One is to prevent hydraulic oil from entering container 21.

Airbag 14 provides the gas of certain volume, because volume compression is very big under high pressure for gas, in order to prevent three axles Indoor hydraulic oil enters in device, to there is certain gas volume, and U-tube can be still full of after high pressure compressed, Prevent the aircraft fluid in triaxial chamber from entering container 21;

Two be to prevent the engineering fluid in container 21 from entering in triaxial chamber and hydraulic oil mixing.

Test in loading procedure, piston 9 slowly enters the cavity volume 18 of container 21, occupies certain volume, causes in cavity volume 18 Engineering fluid enter U-tube, or even flow into airbag 14, now, the effect of airbag 14 is exactly to store the engineering liquid flowed out, every Hydraulic oil in exhausted triaxial chamber, the engineering liquid in cavity volume 18.

The material of chassis 1 and cover plate 8 is stainless steel, to prevent corrosivity catalase to be scattered post-etching device;

The material of transparent cylinder side wall 4 is organic resin glass, transparent, it is not necessary to pressure-bearing.

Detailed test procedure is as follows:

1) core sample with seaming chuck 16a, push-down head 16b is placed on the rock core pallet 2 on chassis 1, with alignment pin 3 With the Blind locating holes (not shown) positioning below push-down head 16.

2) by installing Ring like suction disc 5a on rubber, lower Ring like suction disc 5b transparent cylinder side wall 4 adsorb absorption on chassis 1 On chassis.

3) connecting line is connected by the second through hole 6 of the bottom of transparent cylinder side wall 4 with the interface of testing machine chassis 1, and , if obvious leak, clogged beyond the Great Wall as the solid rubber plug of first seal 7 with plasticine in second through hole 6.

4) cover plate 8 is covered on transparent cylinder side wall 4 so that upper Ring like suction disc 5a holds cover plate 8.Piston 9 is pushed, Touch the seaming chuck 16a above core sample.

5) the fourth hole 10b for filling in the rubber stopper with holes with U-tube on cover plate 8, unplugs third through-hole 10a reality Heart rubber stopper, injects engineering liquid, until cavity volume 18 of the engineering fluid full of whole container 21, but should not be excessive, should not inject Into U-tube, the solid rubber plug as second seal 20 is stoppered.

6) airbag 14 is full of gas, is connected to U-tube.

7) package unit is put on testing stand, puts down triaxial chamber, it is oil-filled, then carried on according to triaxial tests step Experiment.In the process, because triaxial chamber progressively pressurizes, the gas volume in airbag 14 can be gradually compressed, because initial gas Body volume is set greater than 500 times of U-tube gas volume, so in the case of triaxial chamber pressure 50MPa, the gas of airbag U-tube will not be all pressed into, enter U-tube to prevent the aircraft fluid of triaxial chamber, and then enter in container 21.

9) in process of the test, the pressure head of testing machine can be applied pressure on the piston 9 above cover plate 8, and piston 9 is directly acted on On experiment seaming chuck 16a in device, with the progress of loading, the piston 9 on cover plate 8 just declines, occupying device volume, this When cavity volume 18 in engineering fluid can flow into U-tube, can also be along gas of the U-tube compression hundreds of times if loading is than larger Body is forced into airbag 14, and engineering fluid is also possible to that airbag 14 can be entered, because the presence of airbag 14, engineering fluid will not be with three axles Indoor hydraulic oil mixing,

10) after off-test, drain the oil, triaxial chamber pressure reduction, the gas of airbag 14 can expand again because pressure is reduced Full of airbag 14.

11) triaxial chamber is opened, the naked triaxial compression test device of rock provided in an embodiment of the present invention is taken out into testing stand, pulled out The rubber stopper as first seal 7 of the round bottom of side wall 4 is opened, first through hole 6 is used to discharge engineering liquid.

The present invention mainly has following advantage:

1) it is simple in construction.Complicated machining is not needed;

2) device is independent.Hydraulic system interdependency with triaxial chamber and testing machine is not high, can be tried with any type of three axle Test machine collocation;

3) it is easy to assembly.Three critical pieces, which only need to absorption, can complete assembling;

4) good observability.Major part is middle transparent cylinder side wall 4, it can be seen that inside cylinder side wall 4 Situation;

5) it is low to seal request.Because inside and outside container 21 being connection, pressure balance, it is not necessary to accurate sealing is only needed Conventional seals are wanted just to meet requirement.

6) device is adapted to any engineering liquid, can be not only water, can also be crude oil, bittern engineering liquid.

7) no matter the density of engineering fluid is also less than hydraulic oil more than hydraulic oil to realize.

8) set-up procedure is simple, it is only necessary to inject engineering fluid before the test.

Here is the size according to specific rock core, to a specific design example of plant bulk:

Core sample size:Lithology:Rock salt

Plant bulk is designed:

The diameter dimension of rock core pallet 2 is 100mm, and the height of rock core pallet 2 is 10mm, a diameter of 200mm in chassis 1, chassis 1 Height 20mm, a diameter of 200mm of cover plate 8, the height of cover plate 8 is 10mm, a diameter of 100mm of piston 9, the height of piston 9 for 120~ 150mm。

Core sample body 15 is about 300mm plus pressure head 16a, push-down head 16b height, so transparent cylinder side wall 4 height is designed as between 320-350, a diameter of 180mm of transparent cylinder side wall 4, the second through hole of bottom of transparent cylinder side wall 4 6 a diameter of 10mm.

Third through-hole 10a, a diameter of 10mm of fourth hole 10b on cover plate 8, the diameter of bore of rubber stopper with holes is 2mm, U Shape pipe external diameter 2.1mm, internal diameter is 2.0mm, and U-tube is highly 25mm, and U-tube bottom lengths are 50mm, can calculate and obtain U-shaped The internal volume of pipe be 1.256mL, the initial volume of airbag 14 be 1000mL (>628mL=1.256mL × 500).

The test procedure for the naked triaxial compression test method of rock that the present embodiment is provided is as follows:

1) core sample with seaming chuck 16a, push-down head 16b is placed on the rock core pallet 2 on chassis 1, with alignment pin 3 With the positioning hole (not shown) positioning below push-down head 16.

2) by installing Ring like suction disc 5a on rubber, lower Ring like suction disc 5b transparent cylinder side wall 4 adsorb absorption on chassis 1 On chassis.

3) connecting line is connected by the second through hole 6 of the bottom of transparent cylinder side wall 4 with the interface of testing machine chassis 1, and filled in Firmly solid rubber plug, if obvious leak, is clogged with plasticine.

4) cover plate 8 is covered on transparent cylinder side wall 4 so that upper Ring like suction disc 5a holds cover plate 8.

5) piston 9 is pushed, touches the upper pressure 16a heads above core sample.

6) the fourth hole 10b for filling in the rubber stopper with holes with U-tube on cover plate 8, unplugs third through-hole 10a reality Heart rubber stopper, injects engineering liquid, until full of whole container 21, being stoppered solid rubber plug.

7) airbag 14 is full of air, is connected to U-tube.

8) package unit is put on testing stand, puts down triaxial chamber, it is oil-filled, then carried on according to triaxial tests step Experiment.

9) after experiment terminates, drain the oil.

10) triaxial chamber is opened, device is taken out into testing stand, the rubber stopper of the bottom of cylinder side wall 4 is unpluged, outage is opened, Discharge engineering liquid.

, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent Select embodiment and fall into having altered and changing for the scope of the invention.

Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to comprising including these changes and modification.

Claims (13)

1. a kind of naked triaxial compression test device of rock, using when, it is integrally placed in triaxial chamber, it is characterised in that including holding Device, airbag, communicating pipe, piston,
Cavity volume is provided with the container, bare core sample is placed in the cavity volume,
The cover plate of the container is provided with first through hole, and the piston is arranged in the first through hole, the piston with it is described Sealing is combined together between the cover plate of container,
The airbag is connected by the communicating pipe with the cavity volume,
The volume of the airbag is at least 500 times of the communicating pipe volume.
2. the naked triaxial compression test device of rock according to claim 1, it is characterised in that described also including push-down head One end of push-down head is fixedly connected on the core sample body bottom portion, and the other end of the push-down head offers blind hole, described The chassis of container is provided with alignment pin, and the specification of the blind hole is corresponding with the specification of the alignment pin, the core sample sheet Body is placed in the container by the cooperation of the blind hole and the alignment pin.
3. the naked triaxial compression test device of rock according to claim 2, it is characterised in that described also including seaming chuck One end of seaming chuck is fixedly connected on the core sample bodies top, and the other end of the seaming chuck is used as pressure loading end.
4. the naked triaxial compression test device of rock according to claim 1, it is characterised in that the cover plate of the container, bottom Disk, side wall split, the side wall are cylindrical, seal and coordinate between the cover plate, chassis and the side wall.
5. the naked triaxial compression test device of rock according to claim 4, it is characterised in that also including upper Ring like suction disc, Lower Ring like suction disc, the cover plate is coordinated by being sealed between the upper Ring like suction disc and the top side wall, and the chassis passes through Seal and coordinate between the lower Ring like suction disc and the sidewall bottom.
6. the naked triaxial compression test device of rock according to claim 1, it is characterised in that also including first seal, The sidewall bottom of the container offers the second through hole, and the first seal is removably attachable to second through hole.
7. the naked triaxial compression test device of rock according to claim 6, it is characterised in that also including second seal, 3rd seal,
The cover plate is provided with third through-hole, fourth hole, and the third through-hole is used for the injection of engineering fluid, the four-way Hole is used to connect the communicating pipe,
The second seal is removably attachable to the third through-hole,
3rd seal is removably attachable to the fourth hole, and the 3rd seal center offers the 5th and led to Hole, is sealed and coordinated the communicating pipe by outer wall and the fifth hole.
8. the naked triaxial compression test device of rock according to claim 4, it is characterised in that the side wall is by transparent material It is made.
9. the naked triaxial compression test device of rock according to claim 1, it is characterised in that the communicating pipe outermost end is stretched Go out to outside the outer most edge of the cover plate of the container;
Preferably, when the top of the piston and the core sample is completely attached to, between the top land and cover plate Distance is at least 10cm;
Preferably, also including rubber band, the airbag between the rubber band and the communicating pipe by being sealedly connected on one Rise;
Preferably, the cover plate and chassis are made up of stainless steel;
Preferably, also including O-ring, the O-ring is connected between the piston and the cover plate.
10. the naked triaxial compression test device of rock according to claim 4, it is characterised in that the communicating pipe outermost end Outside the outer most edge for the cover plate for reaching the container;
Preferably, the side wall is made up of organic resin glass.
11. the naked triaxial compression test device of rock according to claim 5, it is characterised in that the communicating pipe outermost end Outside the outer most edge for the cover plate for reaching the container;
Preferably, the upper Ring like suction disc and lower Ring like suction disc are made up of quality of rubber materials respectively.
12. the naked triaxial compression test device of rock according to claim 7, it is characterised in that the communicating pipe outermost end Outside the outer most edge for the cover plate for reaching the container;
Preferably, the first seal, second seal, the 3rd seal are made up of quality of rubber materials.
13. a kind of naked triaxial compression test method of rock, based on any described naked triaxial compressions of rock in claim 1~12 Experimental rig and realize, it is characterised in that comprise the following steps:
Core sample is positioned in the container,
Press piston so that the top of the piston and core sample is completely attached to,
Engineering fluid is filled into the container,
The airbag that will be filled with gas is connected to the communicating pipe,
The naked triaxial compression test device of rock is integrally placed in triaxial chamber,
Hydraulic oil is filled with into the triaxial chamber,
Experiment is carried on according to existing rock triaxial compression test method, with the hydraulic pressure in the triaxial chamber gradually Gas of the gas in airbag in increase, the airbag is gradually compressed, and makes the volume-diminished of the airbag,
Apply pressure to the piston, the pressure born with the piston gradually increases, and the piston is relative to the container Cover plate move down, tie up the engineering fluid in the container, the engineering fluid of volume suitable with by volume is tied up passes through institute State and be transferred to the airbag communicating pipe;
After experiment terminates, the hydraulic oil in the triaxial chamber is discharged, the airbag is re-inflated;
The triaxial chamber is opened, the engineering fluid in the container is discharged.
CN201510543941.4A 2015-08-28 2015-08-28 A kind of naked triaxial compression test device of rock and test method CN105181469B (en)

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CN106053244B (en) * 2016-07-07 2018-04-17 中国科学院武汉岩土力学研究所 Salt cave storage tank farm country rock self-balancing type triaxial compression test device and test method
CN106290125B (en) * 2016-07-28 2018-09-07 重庆大学 Salt cave storage tank farm country rock grease cycle corrodes simulation test device and test method
CN108489799B (en) * 2018-02-27 2020-09-08 中国科学院武汉岩土力学研究所 Rock gas triaxial/bare triaxial compression test device, system and method

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