CN106018059A - Test device and method applicable to rock and capable of realizing principal stress axis rotation - Google Patents

Test device and method applicable to rock and capable of realizing principal stress axis rotation Download PDF

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Publication number
CN106018059A
CN106018059A CN201610342536.0A CN201610342536A CN106018059A CN 106018059 A CN106018059 A CN 106018059A CN 201610342536 A CN201610342536 A CN 201610342536A CN 106018059 A CN106018059 A CN 106018059A
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China
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rock
confined pressure
depression bar
charger
sample
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CN106018059B (en
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陆银龙
张扬
王连国
李兆霖
肖天博
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • G01N3/12Pressure testing

Abstract

The invention relates to a test device and method applicable to rock and capable of realizing principal stress axis rotation. Two symmetrical torsion bars are used; the additional moment is eliminated, so that the eccentric phenomenon cannot occur in the compression bar moving process; the torsion bars are pulled by a steel wire rope to rotate and to apply the torque; the rigid loading of the torque is changed into flexible loading; the problems that due to the rigid loading, the axial force and the torque are mutually influenced, a force transfer bar cannot be vertical to a jack, and the like are solved. Upper and lower press heads and a specimen are fixedly connected into a whole through a circular arc splint and resin structural adhesives; the press heads are enabled not to be separated from the specimen in the torsion loading process; the end part of the specimen is not grooved; the specimen end part destroy caused by stress concentration phenomenon is avoided. Internal and external confining pressure goes in or out of an oil passage in a completely separated way, so that the internal and external confining pressure is completely independent without mutual influence. The axial force, the torsion, the internal confining pressure and the external confining pressure can be loaded in an independent or hybrid way; the principal stress axis rotation can also be realized; the deformation destroy of the rock in the complicated stress loading path is simulated.

Description

The assay device of a kind of realized principal stress axis rotation being applicable to rock and method
Technical field
The invention belongs to rock mechanics and rock test field, be specifically related to a kind of realized principal stress being applicable to rock The assay device of axle rotation and method, belong to Geotechnical Engineering field.
Technical background
Complex stress, especially comprises principal stress size and changes and the complex stress of principal stress axis rotation, actual in engineering In exist widely.Such as, as, in the engineering site digging process such as mining tunnel, city underground, seabed tunnel, rock mass is internal should Power status and appearance extremely complex, the independence changed along with principal stress axis rotation and principal stress size or showing of being mixed As.Above-mentioned engineering reality all exists the stress state that rock interior is complicated, and the mechanical property that rock is under complex stress condition The biggest difference is there is, accordingly, it is capable to carry out rock complex stress load test, Jin Eryan at laboratory under matter and Simple stress condition Studying carefully the intensity of rock under complicated stress environment effect, deformation and failure form, prevention and improvement for engineering project disaster have weight The directive significance wanted.
At present, can realize in laboratory simulate ground stress loading path assay device specifically include that uniaxial compression instrument, Normal triaxial instrument (false three axles), true triaxil tester, direct shear apparatus, ring shear apparatus etc..But above-mentioned test apparatus device all can not realize simulation The stress path of rock principal stress axis rotation loads, and the stress path of principal stress axis rotation loads and typically uses hollow cylinder torsional more Cut instrument.Geotechnical Engineering field has been developed over being applicable to the hollow cylinder torsional shear instrument of the soil body at present, but the soil body and rock mass are two Planting different engineering materials, there is the biggest difference in its mechanical property, current soil body hollow cylinder torsional shear instrument can not be the suitableeest For rock material.The difference of soil and rock material maximum is, rock hardness and intensity for soil are greatly improved, The deformation of the lower rock of the effect of imposed load is the least, but it is the most much bigger to reach to destroy required stress.Based on above-mentioned factor, Cause being applicable to soil and be applicable to the stress path load testing machine of rock and be primarily present following difference: the 1. deformation phase of rock To with soil for the least, so measuring of sample deformation needs different apparatus and method;2. due to problem of stress concentration, rock Hollow cylinder sample can not be slotted in upper and lower end parts, is otherwise easy to during moment of torsion applies cause sample end to be destroyed, Affect the stress loading of whole sample, so rock sample moment of torsion loads needs special charger and method;3. due to examination Experiment device needs inside and outside confined pressure independent loads, and the confined pressure that rock material needs is more much bigger than soil, so needing to use oil Pressure realizes and needs the most independent turnover oil channel path, and requires hollow cylinder sample inside and outside wall seal isolation property Higher, make inside and outside oil pressure load and be independently independent of each other;4. the low magnitude stress loading of the soil body it is different from, owing to rock material loads Required axial force and moment of torsion are the biggest, and axial force and moment of torsion are applied to sample by common force transmission shaft, just can not The loading causing moment of torsion and axial force avoided interferes with each other, and this interference can largely affect axial force and moment of torsion Independent loads, and cause the loading data of stress that big deviation occurs, require that for this test apparatus charger should be avoided as far as possible Or reduce this influencing each other.
Related with the present patent application have:
1. relate to indoor rock mechanics experiment device disclosed in Chinese patent CN104155175A, be more particularly to realize complexity The rock hollow cylinder torsional shear instrument of stress path.This torsion shear apparatus is by base, sleeve, push-down head, seaming chuck, piston, the seat of honour, top Lid, connecting rod, torsion device form, and can independently or mixedly load axial force, interior confined pressure, outer confined pressure and moment of torsion.It is mainly created Newly include: a. seaming chuck, push-down head and rock sample are bonded to one by seccotine, seaming chuck, push-down head and rock sample Contact surface have boss, add rock sample and seaming chuck, the contact area of push-down head, reduce contact when moment of torsion loads Emaciated face from risk;B. the seat of honour and top cover are internally formed cross oil pocket, and piston is placed in cross oil pocket actively, and piston will Cross oil pocket is divided into upper and lower two parts, and piston to cross oil pocket top delivery hydraulic pressure oil and is loaded axially by hydraulic servo pump Power, therefore, is different from traditional rigidity load mode using jack to contact with rigid rod, in this application the adding of axial force Carry the flexible load mode using hydraulic oil and piston contact, it is to avoid jack contact the end-face friction of generation and imitates with rigid rod Should, effectively eliminate interfering when axial force and moment of torsion load jointly;C. by counterforce device trimming moment, instrument is made There is not rotation trend bottom device, therefore, there is no need to additionally configure fixed platform.
The soil body is two kinds of different engineering materials with rock mass, and its mechanical property exists the biggest difference, it is adaptable to the sky of rock A lot of problem is there is in heart cylinder torsional shear instrument with being applicable to native comparing, though the rock hollow cylinder torsional shear instrument involved by above-mentioned patent So solve these problems as far as possible, but there is also a lot of deficiency.First, 1. in patent proposition with cross oil pocket provide axle power from And become rigidity and be loaded as flexible loading thus eliminate axle power loading and influencing each other that moment of torsion loads, but rock test is destroyed Generally require and reach tens MPas or the axial stress of up to a hundred MPas, under the biggest pressure to instrument either fuel tank outside Connect part or the sealing with sample contacts part has the biggest requirement, actual tests is easy to owing to there is leakage of oil Problem causes pressure not increase or is not provided that steady pressure, causes test fluctuation result inaccurate.Secondly, 2. instrument reverses Device only provides torsion in side, for the rotating shaft of moment of torsion, is formed without symmetric moment, it is impossible to make it be close to force transmission shaft Pressure resultant force is zero, can produce additional moment, increases friction;And provide the piston 1 of axle power be in rotation and be axially moveable Compound movement in, but torsion device is to be fixed on piston by rigid torque dowel steel, the countershaft application point of moment of torsion is not Can together move with axle thus produce the interference to axial force;And during moment of torsion applies after piston rotation certain angle, Moment of torsion dowel steel can not keep vertical with jack, makes the applying of moment of torsion go wrong.Thirdly, 3. seaming chuck in patent, under Pressure head and rock sample are bonded to one by seccotine, and in test cohesive force can occur not during high torque The rock sample enough caused and the phenomenon that gets loose of pressure head, so that the loading of moment of torsion goes wrong or causes result of the test to be forbidden Really.Finally, 4. in patent, inflow pipeline and flowline are more, and in test, sealing and the stability of oil pressure need to accept very end-of-term examination Test, it is important that intrinsic pressure exhaustor 19 is placed in exocoel oil pressure, and exhaustor is flexible pipe, can in exocoel oil pressure pressure process Can extrude exhaust hose causes internal oil pressure to change, and making inside and outside confined pressure load can not be completely independent, this invention on the whole Entering in oil discharge passage design of device is not the most the most perfect.
Summary of the invention
In order to realize rock loading under complicated stress environment, especially realize the stress road of rock principal stress axis rotation Footpath loads, and the present invention designs a kind of assay device and the method for realized principal stress axis rotation being applicable to rock, studies rock Stone mechanical characteristic under complex stress condition.
For achieving the above object, its technical scheme is as follows: the examination of a kind of realized principal stress axis rotation being applicable to rock Experiment device, including agent set and power set;Described agent set includes top cover, sleeve, base, pressure head and depression bar;Institute State sleeve to be connected with top cover, base by flange respectively;The top of depression bar connects two symmetrical horizontal torque arms, and lower end is worn Cross top cover to enter in sleeve, and can move up and down relative to top cover and rotate;Pressure head is positioned at sleeve inner, installation symmetrical above and below At the two ends of rock sample, seaming chuck and depression bar are embedded in, and push-down head is embedded in base, and the connecting of pressure head and depression bar and base Face is correspondingly provided with and is prevented from pressure head relative to depression bar or the stopping means of base circumferential movement;Described rock sample is open circles Column construction, its inner chamber and upper push-down head form internal confined pressure chamber;Base and sleeve, top cover, depression bar, pressure head, rock sample Outer wall forms confined pressure chamber, outside, and described internal confined pressure chamber and outside confined pressure chamber are each independent, and it is logical to be respectively equipped with independent oil circuit Road;Described power set include axle force loading device, torque loading device and confined pressure charger;Described axle force loading device is made For the top of depression bar, torque loading device is connected with torque arm by steel wire rope, and torsion charger is relative to depression bar pair Claiming to arrange, force direction is contrary, and under original state, steel wire rope and torque arm are vertical in horizontal plane;Confined pressure charger is divided into Internal confined pressure charger and outside confined pressure charger, the asphalt channel with internal confined pressure chamber, outside confined pressure chamber is connected respectively.
Described confined pressure charger includes oil feeding device and oil discharging device respectively, and oil feeding device connects under asphalt channel End, oil discharging device connects the upper end of asphalt channel, collectively forms confined pressure loading system with confined pressure chamber.
The asphalt channel in described internal confined pressure chamber includes the alternate path being arranged on base center, is arranged on upper and lower pressure head The fourth passage in axle center, third path, and it is arranged on the fifth passage at depression bar center, above each path sequential communication, and right The centrage answering internal confined pressure chamber is arranged, and described alternate path and fifth passage are L-type, and wherein alternate path connects oil-feed dress Putting, fifth passage connects oil discharging device.
The asphalt channel of described outside confined pressure cavity includes the first path being arranged on base side and is arranged on top cover The steam vent of sidewall;Wherein the first path is L-type, connects oil feeding device, and steam vent connects oil discharging device.
Described steam vent is at least provided with one.
Described depression bar bottom face and base top surface centrally along axially having column type groove, groove vicinity is provided with some little Draw-in groove.
Described pressure head is provided with a cylinder-shaped body, and the end face of main body is provided with and coincide the boss of grafting with described groove, convex The fixture block being provided around being connected with described draw-in groove of platform;The center of main body other end is provided with and is inserted into rock sample inner chamber Hollow cylinder fixed cover, the outside of fixed cover is provided with between fixed cover the circular arc clamping plate forming ring gripping chamber, described circle Arc clamping plate are fixed by screw with main body outer rim.
The exterior channels of described boss is provided with O-ring seals.
It is placed with steel ball plate in the middle of described depression bar and axial force charger.
Described top cover is provided with O type rubber seal with the installation position groove of depression bar.
Further, this assay device also includes data acquisition processing device, and data acquisition processing device includes computer And data acquisition unit.
Further, this assay device also includes the foil gauge being arranged on outside rock sample, is provided with close outside foil gauge Big envelope, the barrel of sleeve has threading hole, and the wire of foil gauge passes cartridge exterior and data acquisition process from threading hole Device connects.
Described data acquisition processing device is connected with axle force loading device, torque loading device and confined pressure charger.
The test method of a kind of realized principal stress axis rotation being applicable to rock, comprises the following steps:
The installation of step 1) trial body:
Step 1.1) paste foil gauge at hollow cylinder rock sample periphery medium position, then wrap up rubber at sample outer wall Set, with resin glue sealing rubber cover lower edges;
Step 1.2) rock sample is fixed between upper and lower pressure head, and ensure that centrage aligns, with resin structure glue by pressure head It is consolidated into an entirety with sample;
Step 1.3) pressure head that consolidation is integrated and sample be vertically mounted on base center, and sleeve is solid with floor installation Fixed, foil gauge wire is derived from the threading hole of sleeve lateral wall and is connected data acquisition processing device;
Step 1.4) depression bar is through top cover, vertical with seaming chuck end face and be embedded in fixing, top cover and sleeve fixed installation;
Step 1.5) the trial body device III assembled is placed on testing stand, base is fixed with testing stand, it is ensured that examination During testing, agent set will not be moved and rotate;
Step 2) installation of power set:
Step 2.1) axial force charger is installed, steel ball plate on the pad of depression bar top, by defeated for the power of axial force charger Go out end to be arranged on steel ball plate, to realize the axial force Load-unload to sample;
Step 2.2) apply a less engagement shaft power, sample and pressure head are compressed, it is ensured that stage on-test sample is fixed In agent set;
Step 2.3) connect torque loading device, by steel wire rope, torque arm and torque loading device are coupled together, constitute and turn round Square charger, it is achieved moment of torsion add unloading, connection procedure requiring, steel wire rope and torque loading device are with depression bar central shaft pair Claim, and in stage on-test steel wire rope horizontal parallel;
Step 2.4) connect confined pressure charger, first oil feeding device and the oil discharging device of two groups of independences are set, one of which is entered Oily device and oil discharging device are connected with internal confined pressure chamber, and another group oil feeding device and oil discharging device lead to the fuel-displaced of outside confined pressure chamber Road connects, and forms two independent confined pressure chargers;
Step 2.5) power charger is connected with computer respectively;
Step 3) starts each power charger individually or simultaneously, sample applies axial, moment of torsion and/or confined pressure loading force, respectively The operational data of power set and the data of foil gauge collection are passed to computer and are analyzed.
The positive effect of the present invention:
1. this assay device design science is reasonable, it is easy to manufactures and assembles, simple to operate, and precision is high, can independently or the loading that mixes Axial force, moment of torsion, interior confined pressure and outer confined pressure, by tangent stress analysis in the middle part of hollow cylinder rock sample, This assay device can not only change principal stress size, also can realize principal stress axis rotation, and then can answer in complexity with simulation rock Deformation failure under power load path.
2. this assay device is divided into six independent experimental provisions, and testing crew can select oneself flexibly according to physical condition Required each self-contained unit, in addition to agent set device, power set and data acquisition unit may select existing device or oneself is joined Close the apparatus of EXPERIMENTAL DESIGN processing.
3. this trial body device uses the design of symmetrical two torque arms, and for the rotating shaft of depression bar, it is right to define Claim moment, depression bar is close to pressure to make a concerted effort be zero, eliminate additional moment, make depression bar not have bias in motor process Phenomenon, improves test accuracy and stability.
4. this trial body device uses sufficiently long steel wire rope to pull torque arm rotation to apply moment of torsion, becomes the firm of moment of torsion Property load mode be flexible load mode so that when depression bar rotationally and axially moves in little scope, the applying of moment of torsion can be normal Stable, rigidity load mode the axial force and the moment of torsion that cause influence each other, turn an angle after dowel steel can not be with very heavy The problems such as roof pendant is straight have been resolved.
5. by the circular arc clamping plate on indenter device, rock sample end is tightly clamped, coordinate resin structure glue by up and down Pressure head and sample are consolidated into one, it is ensured that the phenomenon that pressure head and sample depart from will not occur in moment of torsion loading procedure, and not to examination Sample end carries out slot treatment etc., it is to avoid the sample end that stress concentration phenomenon causes is destroyed.
6. in agent set device, it is easier that inner peripheral is pressed into oil discharge passage, substantially reduces leakage of oil, confined pressure shakiness etc. negative The possibility that face situation occurs, and internal confined pressure and outside confined pressure enter oil discharge passage and be kept completely separate, and makes inside and outside confined pressure load completely Independently it is independent of each other.
Accompanying drawing explanation
Fig. 1 is overall apparatus device schematic diagram of the present invention.
Fig. 2 is agent set schematic diagram of the present invention.
Fig. 3 is pressure head schematic top plan view of the present invention.
Fig. 4 is pressure head generalized section of the present invention.
Fig. 5 is depression bar of the present invention and torque loading device schematic diagram.
In figure: I-axle force loading device, II-torque loading device, III-agent set, IV-outside confined pressure charger, V-internal confined pressure charger, VI-data acquisition processing device, 1-steel ball plate, 2-depression bar, 3-torque arm, 4-top cover, 5-arranges Pore, the high-strength screw of 6-, 7-screwed hole, 8-sleeve, 9-the first path, 10-base, 11-alternate path, 12-O type rubber seal Circle, 13-third path, 14-foil gauge, 15-threading hole, 16-rock sample, 17-pressure head, 18-fourth passage, 19-O type rubber Sealing ring, 20-fifth passage, 21-boss, 22-circular arc clamping plate, 23-resin structure glue, 24-fixture block, 25-torque loading device, 26-steel wire rope, 27-depression bar groove, 28-base groove.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Single unit system is as it is shown in figure 1, the assay device of a kind of realized principal stress axis rotation being applicable to rock, including main (axle force loading device I, torque loading device II, outside confined pressure charger IV, internal confined pressure add for body device III, power set Carry and put V) and data acquisition processing device VI.
Described agent set III overall structure as in figure 2 it is shown, include described agent set include top cover 4, sleeve 8, Base 10, pressure head 17 and depression bar 2;Described sleeve 8, top cover 4 and base 10 are equipped with flange, the edge uniform screw thread of circumference of flange Hole 7, and connected by high-strength screw 6.Side wall upper part at least one steam vent 5 circumferentially disposed of top cover 4;The centre of sleeve 8 Position arranges threading hole 15.In order to coordinate the loading of hollow cylinder rock sample 16, agent set III global design is column type Structure.The top of depression bar 2 connects two symmetrical horizontal torque arms 3, and lower end enters sleeve through the installing hole at top cover 4 center In 8, and can move up and down relative to sleeve 8 and rotate, described top cover 4 is provided with O type rubber with the installation position groove of depression bar 2 Glue sealing ring 19, it is ensured that depression bar 2 during free motion with the sealing requirements of top cover 4.Depression bar 2 is central axial has Five paths 20, depression bar 2 lower center has column type depression bar groove 27, and lower surface is provided with some lesser calories around depression bar groove 27 Groove.The end face center of base 10 is provided with base groove 28, is provided with some little draw-in grooves, the central shaft of base 10 around base groove 28 To being provided with third path 13, the side normal direction of base 10 is provided with the first path 9, and the bottom of third path 13 and the first path 9 is horizontal To extending to outside base 10.
As shown in Figure 3 and Figure 4, it is internal that pressure head 17 is positioned at sleeve 8, and setting symmetrical above and below is used for fixing rock sample 16, on The shape of lower two pressure heads 17 is identical.Described pressure head 17 is provided with a cylinder-shaped body, and the end face center of main body is provided with described Pressure head groove 27 coincide the boss 21 of grafting, the fixture block 24 being provided around being connected with described draw-in groove of boss 21;The main body other end The center in face is provided with hollow cylinder fixed cover, and the outside of fixed cover is provided with between fixed cover the circular arc forming ring gripping chamber Clamping plate 22, described circular arc clamping plate 22 are fixed by screw with main body outer rim.The Main Function of seaming chuck 17 is to connect depression bar 2 and rock Stone sample 16, transmits axial force and moment of torsion to sample.
During as in figure 2 it is shown, install, upper and lower pressure head 17 is sleeved on the two ends of rock sample 16, fixing of upper and lower pressure head 17 Being linked in the through hole at rock sample 16 center, circular arc clamping plate 22 coordinate fixed cover tightly to be pushed down at sample two ends, and at folder Seam is coated resin structure glue, makes pressure head 17 and rock sample 16 consolidation be integrated, it is ensured that to apply pressure head 17 and sample during moment of torsion Will not separate.Then by the cylinder boss 21 inserted base groove 28 of push-down head 17, O type rubber seal 12 therein is coordinated, Ensureing that push-down head 17 and base 10 agree with is an overall structure, protrudes fixture block 24 and is stuck with base 10 draw-in groove, makes sample exist Will not be separated by push-down head 17 during moment of torsion effect and base 10.In the same way seaming chuck 17 is connected with depression bar 2.Pressure head 17 Structure arrange and it is with base 10, the mounting means of depression bar 2, make sample 16 push-down head 17 and base when by moment of torsion effect 10, depression bar 2 will not separate, it is ensured that normally provide torsional forces and moment of torsion counter-force to rock sample 16.Outer wall at rock sample 16 Middle part foil gauge 14 is installed, the wire of foil gauge 14 passes to sleeve 8 outside from threading hole 15, connects data acquisition at wire After collection processing means VI, threading hole 15 is sealed, it is ensured that cavity overall tightness.
As depicted in figs. 1 and 2, after agent set III installation, rock sample 16 forms inside with upper push-down head 17 and encloses Pressure chamber, base 10 and sleeve 8, top cover 4, depression bar 2, pressure head 17, rock sample 16 outer wall form outside confined pressure chamber, internal confined pressure chamber Each independent with outside confined pressure chamber.And alternate path 11, third path 13, internal confined pressure chamber, fourth passage 18 and the 5th Path 20 sequential communication, forms the asphalt channel in internal confined pressure chamber, connects internal confined pressure charger V, constitutes internal confined pressure and adds Loading system;First passage 9 connects with outside confined pressure chamber, steam vent 4, forms the asphalt channel in outside confined pressure chamber, connects outside enclosing Pressure charger IV, constitutes outside confined pressure loading system.Confined pressure charger includes oil discharging device and oil feeding device, and goes out oil-feed Device connects the lower end of asphalt channel, and oil discharging device connects the upper end of asphalt channel.
As it is shown in figure 5, torque arm 3 is connected with torsion charger II by steel wire rope 26, pull torsion by steel wire rope 26 Power bar 3 provides moment of torsion.
As it is shown in figure 1, install axle power rehandling facilities I on the top of depression bar 2, mutual for reduce between axial force and moment of torsion Impact, that places in the middle of depression bar 2 and axial force charger I has steel ball plate 1, between depression bar 2 and axial force charger I Sliding friction changes rolling friction into, efficiently reduces the impact of friction.
As it is shown in figure 1, axle force loading device I, torque loading device II, outside are turned pressure charger IV, internal confined pressure Charger V is connected with data acquisition processing device VI respectively.Data acquisition processing device VI is by data acquisition unit and calculating Machine forms.
The test method of compatibility test device of the present invention, comprises the following steps:
1. prepare hollow cylinder rock sample 16, paste foil gauge 14 at sample 16 medium position, then at sample 16 outer wall bag Wrapping up in rubber sleeve, the wire of foil gauge 14 is derived from rubber sleeve one end, with resin glue sealing rubber cover lower edges.
2. upper push-down head 17 is placed in sample 16 two ends, with circular arc clamping plate 22, sample is tightly clamped, it is ensured that upper push-down head 17 and sample 16 on same centrage, then coat resin structure glue 23 at sample 16 and pressure head 17 contact portion, wait to set Pressure head 17 and sample 16 is made to be consolidated into an entirety after fat structure glue 23 solidification.
3., in push-down head cylinder boss 21 inserted base groove 28, make pressure head protrude fixture block 24 and be stuck on base 10 draw-in groove, And ensure that cylinder boss 21 and base groove 28 are on same centrage.
4. sleeve 8 is placed on base 10, foil gauge wire is derived from threading hole 15, adjust screwed hole 7 position, twist Tight high-strength screw 6, is fixed on sleeve 8 on base 10.
5. depression bar 2 is passed from the middle circular hole of top cover 4, be placed on seaming chuck 17, seaming chuck cylinder boss 21 is inserted Enter in depression bar groove 27, make pressure head protrude fixture block 24 and be stuck on depression bar 2 draw-in groove, and ensure that cylinder boss 21 and depression bar groove 27 exist Same centrage, adjusts top cover screwed hole 7 position, tightens high-strength screw 6, and top cover 4 is fixed on sleeve 8.
6. the trial body device III assembled is placed on testing stand, base 10 is fixed on testing stand, it is ensured that In process of the test, agent set III will not be moved and rotate.
7. apply a less engagement shaft power before test is carried out, sample and pressure head are compressed, it is ensured that stage on-test Sample is fixed in agent set III;
8. padding steel ball plate 1 on depression bar 2, coordinate axial force loading device I, can realize axial force adds unloading.
9. by steel wire rope 26, torque arm 3 and torque loading device II are coupled together, constitute torque loading system, can be real Show moment of torsion adds unloading, requires that steel wire rope 26 and torque loading device are substantially symmetrical about its central axis with depression bar 2 in connection procedure, and in examination Test incipient stage steel wire rope 26 horizontal parallel.
10. being connected with oil discharging device by steam vent 5, the first path 9 is connected with oil feeding device, collectively forms outside confined pressure and adds Loading system, by the oil-feed of the first path 9, steam vent 5 fuel-displaced, can realize outside confined pressure adds unloading.
Fourth passage 18, fifth passage 20 are connected by 11. with oil discharging device, alternate path 11, third path 13 and oil-feed Device is connected, and collectively forms internal confined pressure loading system, by alternate path 11, the oil-feed of third path 13, fourth passage 18, Fifth passage 20 fuel-displaced, can realize outside confined pressure adds unloading.
Foil gauge wire is derived from threading hole 15 by 12., and is connected with data acquisition unit, and coupled computer etc. is constituted Data acquisition processing system, its data gathered include foil gauge data and each servo power device data.
After 13. off-tests, each power set, data acquisition collection device are broken with the connection of trial body device III Open, subject device III is taken off from testing stand, the screw between top cover 4, sleeve 8, base 10 is turned on, take out depression bar 2, and push-down head 17 is taken out from base 10, lay down the circular arc clamping plate 22 on push-down head, remove pressure head 17 and rock sample Resin structure glue 23 between 16, obtains rock sample 16.

Claims (8)

1. it is applicable to an assay device for the realized principal stress axis rotation of rock, including agent set and power set;Institute The agent set stated includes top cover, sleeve, base, pressure head and depression bar;It is characterized in that, described sleeve is respectively by flange and top Lid, base connect;The top of depression bar connects two symmetrical horizontal torque arms, and lower end enters in sleeve through top cover, and energy Enough move up and down relative to top cover and rotate;Pressure head is positioned at sleeve inner, the two ends being arranged on rock sample symmetrical above and below, upper pressure Head is embedded in depression bar, and push-down head and base are embedded in, and the abutted surface of pressure head and depression bar and base is correspondingly provided with and is prevented from pressure Head is relative to depression bar or the stopping means of base circumferential movement;Described rock sample is hollow cylindrical structure, and its inner chamber is with upper Push-down head forms internal confined pressure chamber;Base and sleeve, top cover, depression bar, pressure head, the outer wall of rock sample form outside confined pressure chamber, Described internal confined pressure chamber and outside confined pressure chamber are each independent, and are respectively equipped with independent asphalt channel;Described power set include Axle force loading device, torque loading device and confined pressure charger;Described axle force loading device acts on the top of depression bar, moment of torsion Charger is connected with torque arm by steel wire rope, and torsion charger is symmetrical arranged relative to depression bar, and force direction is contrary, Under original state, steel wire rope and torque arm are vertical in horizontal plane;Confined pressure charger is divided into internal confined pressure charger with outer Portion's confined pressure charger, the asphalt channel with internal confined pressure chamber, outside confined pressure chamber is connected respectively.
The assay device of a kind of realized principal stress axis rotation being applicable to rock the most according to claim 1, its feature Being, described confined pressure charger includes oil feeding device and oil discharging device respectively, and oil feeding device connects the lower end of asphalt channel, goes out Oil device connects the upper end of asphalt channel, collectively forms confined pressure loading system with confined pressure chamber;The oil circuit in described internal confined pressure chamber leads to Road includes the alternate path being arranged on base center, is arranged on the fourth passage in upper and lower pressure head axle center, third path, Yi Jishe Put the fifth passage at depression bar center, above each path sequential communication, and the centrage in corresponding internal confined pressure chamber arrange, described the Two paths and fifth passage are L-type, and wherein alternate path connects oil feeding device, and fifth passage connects oil discharging device;Outside described The asphalt channel of portion's confined pressure cavity includes the first path being arranged on base side and is arranged on the steam vent of top cover sidewall;Its In the first path be L-type, connect oil feeding device, steam vent connect oil discharging device.
The assay device of a kind of realized principal stress axis rotation being applicable to rock the most according to claim 1, its feature Being, described steam vent is at least provided with one.
The assay device of a kind of realized principal stress axis rotation being applicable to rock the most according to claim 1, its feature Be, described depression bar bottom face and base top surface centrally along axially having column type groove, groove vicinity is provided with some lesser calories Groove;Described pressure head is provided with a cylinder-shaped body, and the end face of main body is provided with and coincide the boss of grafting with described groove, the week of boss Enclose and be provided with the fixture block being connected with described draw-in groove;The center of main body other end is provided with the open circles being inserted into rock sample inner chamber Cylindricality fixed cover, the outside of fixed cover is provided with between fixed cover the circular arc clamping plate forming ring gripping chamber, described circular arc clamping plate Fixed by screw with main body outer rim;The exterior channels of described boss is provided with O-ring seals.
The assay device of a kind of realized principal stress axis rotation being applicable to rock the most according to claim 1, its feature It is, in the middle of described depression bar and axial force charger, is placed with steel ball plate.
The assay device of a kind of realized principal stress axis rotation being applicable to rock the most according to claim 1, its feature Being, described top cover is provided with O type rubber seal with the installation position groove of depression bar.
The assay device of a kind of realized principal stress axis rotation being applicable to rock the most according to claim 1, its feature It is, also includes that data acquisition processing device, data acquisition processing device include computer and data acquisition unit;Also include peace It is contained in the foil gauge outside rock sample, outside foil gauge, is provided with sealing shroud, the barrel of sleeve has threading hole, foil gauge Wire passes cartridge exterior from threading hole and is connected with data acquisition processing device;Described data acquisition processing device adds with axle power Carry put, torque loading device and confined pressure charger connect.
8. according to a kind of the realized principal stress axis rotation being applicable to rock described in claim 1 ~ 7 any one claim Test method, it is characterised in that comprise the following steps:
The installation of step 1) trial body:
Step 1.1) paste foil gauge at hollow cylinder rock sample periphery medium position, then wrap up rubber at sample outer wall Set, with resin glue sealing rubber cover lower edges;
Step 1.2) rock sample is fixed between upper and lower pressure head, and ensure that centrage aligns, with resin structure glue by pressure head It is consolidated into an entirety with sample;
Step 1.3) pressure head that consolidation is integrated and sample be vertically mounted on base center, and sleeve is solid with floor installation Fixed, foil gauge wire is derived from the threading hole of sleeve lateral wall and is connected data acquisition processing device;
Step 1.4) depression bar is through top cover, vertical with seaming chuck end face and be embedded in fixing, top cover and sleeve fixed installation;
Step 1.5) the trial body device III assembled is placed on testing stand, base is fixed with testing stand, it is ensured that examination During testing, agent set will not be moved and rotate;
Step 2) installation of power set:
Step 2.1) axial force charger is installed, steel ball plate on the pad of depression bar top, by defeated for the power of axial force charger Go out end to be arranged on steel ball plate, to realize the axial force Load-unload to sample;
Step 2.2) apply a less engagement shaft power, sample and pressure head are compressed, it is ensured that stage on-test sample is fixed In agent set;
Step 2.3) connect torque loading device, by steel wire rope, torque arm and torque loading device are coupled together, constitute and turn round Square charger, it is achieved moment of torsion add unloading, connection procedure requiring, steel wire rope and torque loading device are with depression bar central shaft pair Claim, and in stage on-test steel wire rope horizontal parallel;
Step 2.4) connect confined pressure charger, first oil feeding device and the oil discharging device of two groups of independences are set, one of which is entered Oily device and oil discharging device are connected with internal confined pressure chamber, and another group oil feeding device and oil discharging device lead to the fuel-displaced of outside confined pressure chamber Road connects, and forms two independent confined pressure chargers;
Step 2.5) power charger is connected with computer respectively;
Step 3) starts each power charger individually or simultaneously, sample applies axial, moment of torsion and/or confined pressure loading force, respectively The operational data of power set and the data of foil gauge collection are passed to computer and are analyzed.
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