CN110470529A - Rock indirect tensile strength test method under three-dimensional stress constraint - Google Patents
Rock indirect tensile strength test method under three-dimensional stress constraint Download PDFInfo
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- CN110470529A CN110470529A CN201910884387.4A CN201910884387A CN110470529A CN 110470529 A CN110470529 A CN 110470529A CN 201910884387 A CN201910884387 A CN 201910884387A CN 110470529 A CN110470529 A CN 110470529A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
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Abstract
The invention discloses rock indirect tensile strength test methods under a kind of three-dimensional stress constraint.The test method includes: to provide sample and test device；Sample is placed between the first load plate and the second load plate；The axial stress that the horizontal stress and axially loaded mechanism that adjustment confining pressure chamber indoor hydraulic oil generates sample apply sample, up to horizontal stress and axial stress balance；The internal temperature for adjusting confining pressure chamber is consistent with target temperature, and keeps specimen surface and its internal temperature uniform；The first load plate is continued by axially loaded mechanism to load axial compressive force, has to axial compressive force and obviously falls, sample destroys, and stops load immediately, and off-test obtains the maximum axial pressure of axially loaded mechanism；Indirect tensile strength of the rock sample under three-dimensional stress constraint is calculated according to formula.The present invention can obtain the process of deformation and failure of sample, keep test result more accurate, to practical rock engineering great significance for design.
Description
Technical field
The invention belongs to rock indirect tensile strengths under Geotechnical Engineering field more particularly to a kind of three-dimensional stress constraint
Test method.
Background technique
The indirect tensile strength of rock material is the important parameter in the engineerings such as oil-gas mining, water conservancy and hydropower, compared to anti-
The indirect tensile strength of Compressive Strength, rock material is lower and easily destroys under tensioning effect.The indirect drawing of rock material
It stretches intensity generally to be tested by Brazilian diametral compression test, this method testing procedure is simple, is widely used, and test result is for reality
Border engineering has certain referential, and traditional Brazilian diametral compression test is carried out under two-dimensional state of stress.
However, the rock in deep formation is by three-dimensional as coal, petroleum resources reservoir gradually develop to deep
Reservoir stress acts on, and the indirect tensile strength under three-dimensional stress constraint has more important meaning for the design of actual rock engineering
Justice, and lack the method that rock indirect tensile strength is tested under three-dimensional stress constraint in the prior art.
Summary of the invention
In view of the above existing problems in the prior art, the present invention provides rocks under a kind of three-dimensional stress constraint to stretch indirectly by force
Test method is spent, to obtain the indirect tensile strength value under three-dimensional stress constraint.
The present invention through the following technical solutions to achieve the above objectives:
Rock indirect tensile strength test method under a kind of three-dimensional stress constraint, the test method include:
There is provided sample and test device, wherein the test device includes confining pressure chamber, axially loaded mechanism, first
Load plate and the second load plate, can be filled with hydraulic oil in the confining pressure chamber, and the axially loaded mechanism is mounted on described
The top of confining pressure chamber, the telescopic end of the axially loaded mechanism is operably in the confining pressure chamber indoor telescopic, and described
The underface of the telescopic end of the axially loaded mechanism is arranged in one load plate, and second load plate is fixed at described enclose
On the upside of the bottom for pressing chamber, second load plate and first load plate be oppositely arranged, first load plate and described
The opposite side setting of second load plate is fluted；
The sample is placed between first load plate and second load plate；
The horizontal stress and the axially loaded mechanism pair that the adjustment indoor hydraulic oil of confining pressure chamber generates the sample
The axial stress that the sample applies, until the horizontal stress and the axial stress balance；
The internal temperature for adjusting confining pressure chamber is consistent with target temperature, and keeps the specimen surface and its internal temperature equal
It is even；
First load plate is continued by the axially loaded mechanism to load axial compressive force, first load plate will
Axial compressive force is transmitted on the sample in the form of load, and in the Internal reforming indirect stretching for the sample of the sample
Stress；
Have to the axial compressive force and obviously fall, the sample destroys, and stops loading immediately, off-test, described in acquisition
The maximum axial pressure of axially loaded mechanism；
Indirect tensile strength of the rock sample under three-dimensional stress constraint, the formula is calculated according to formula are as follows:In formula, σ t is indirect tensile strength, and Pmax is the maximum axial pressure for obtaining the axially loaded mechanism, and D is
Specimen finish, t are specimen height.
Further, the confining pressure chamber includes confining pressure cylinder, pedestal and axis pressure cylinder, wherein the confining pressure cylinder is mounted on
On the top of the pedestal, the axis pressure cylinder is mounted on the top of the confining pressure cylinder, the confining pressure cylinder, the pedestal and institute
It states axis pressure cylinder and surrounds the confining pressure chamber, confining pressure load pipeline, the outer end of the confining pressure load pipeline are provided on the pedestal
It is provided on the outer peripheral surface of the pedestal, the inner end of the confining pressure load pipeline and the confining pressure chamber communicate, the axis pressure cylinder
On be provided with gas exhaust piping, the outer end of the gas exhaust piping is arranged on the outer peripheral surface of the axis pressure cylinder, the gas exhaust piping
Inner end and the confining pressure chamber communicate.
Further, cover board is set on the top of the axis pressure cylinder, piston, the work are movably set in the axis pressure cylinder
Plug is the axially loaded mechanism, and the both ends difference activity of the piston passes through the bottom of the cover board and the axis pressure cylinder,
The cover board, the axis pressure cylinder and the piston surround first axle pressure chamber, the axis pressure cylinder, the axis pressure cylinder bottom and
The piston surrounds the second axis pressure chamber, and axis pressure load pipeline is provided on the cover board, and the outer end of the axis pressure load pipeline is set
It sets on the outer peripheral surface of the cover board, the inner end of the axis pressure load pipeline and first axle pressure chamber communicate, the axis pressure cylinder
On be provided with axis pressure air pipe, the outer end of the axis pressure air pipe is arranged on the outer peripheral surface of the axis pressure cylinder, the axis
The inner end of pressure air pipe and second axis pressure chamber communicate, and transfer pipeline is provided in the piston, the transfer pipeline
Both ends are communicated with the confining pressure chamber and first axle pressure chamber respectively.
Further, the sample is disk sample, and the central axis of the sample is horizontal direction.
Further, the equal pasted with high temperature-resistant foil gauge of the axial ends of the sample, the surface of the sample and described
The outside of high temperature strain foil is coated with sealant.
Further, the groove is arc groove, the central axis of the central axis of the arc groove and the sample
It is arranged in parallel, the sample can be contacted with first load plate and the second load printed line.
Further, multiple lead is arranged at intervals between first load plate and the opposite side of second load plate
To bar, one end of multiple guide rods is fixed in second load plate, and the other end of multiple guide rods can
Activity is inserted into the side of relatively described second load plate of first load plate.
Further, data line socket, the axis of the data line socket and the sample are provided in the confining pressure chamber
It is connected to the high temperature resistant foil gauge at both ends, the data line socket setting on the base, is provided with data in the pedestal
Line passage, the lateral surface of the pedestal are provided with data line transmission mouth, the data line socket and data line transmission mouth point
The both ends of the data cable channel are not set, is provided in the data cable channel and connects the data line socket and the number
According to the data line of line transmission mouth.
Further, it is enclosed on the outer peripheral surface of the confining pressure cylinder and is provided with heating element, setting in the confining pressure chamber
There is thermocouple, the thermocouple fixed setting is on the base.
Further, the outside of the test device is enclosed with insulation cover.
The beneficial effects of the present invention are:
Rock indirect tensile strength test method under a kind of three-dimensional stress constraint provided by the present invention, due to being by sample
The test of rock indirect tensile strength is being carried out with the test device of confining pressure and axis pressure, can carried out according to actual formation environment
Indirect tensile strength measurement under Temperature-Stress coupling condition, testing procedure is simple, the deformation failure mistake of available sample
Journey keeps test result more accurate, to practical rock engineering great significance for design.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 shows for the structure of rock indirect tensile strength test device under a kind of three-dimensional stress constraint of the embodiment of the present invention
It is intended to；
Fig. 2 shows for the process of rock indirect tensile strength test method under a kind of three-dimensional stress constraint of the embodiment of the present invention
It is intended to.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Firstly, the embodiment of the invention provides rock indirect tensile strength test devices under a kind of three-dimensional stress constraint.
Fig. 1 shows for the structure of rock indirect tensile strength test device under a kind of three-dimensional stress constraint of the embodiment of the present invention
It is intended to, in conjunction with Fig. 1, which includes confining pressure chamber 1, axially loaded mechanism, the first load plate 16 and the second load plate
17, wherein can be filled with hydraulic oil in confining pressure chamber 1, axially loaded mechanism is mounted on the top of confining pressure chamber 1, axially loaded
The telescopic end of mechanism operably stretches in confining pressure chamber 1, and the flexible of axially loaded mechanism is arranged in the first load plate 16
The underface at end, the second load plate 17 are fixed on the upside of the bottom of confining pressure chamber 1, the second load plate 17 and the first load plate
16 are oppositely arranged, the first load plate 16 and the second load plate 17 it is opposite side setting it is fluted, sample 14 can be placed in the
In groove between two load plates 17 and the first load plate 16, i.e. the upside that the first load plate 16 is placed on sample 14, pass through to
Hydraulic oil is filled in confining pressure chamber 1, to simulate confining pressure, axial compressive force is applied to sample 14 by axially loaded mechanism, to carry out
The test of rock indirect tensile strength, and by adjusting the internal temperature of confining pressure chamber, it can according to reality in the test device
Border ground environment carries out the indirect tensile strength measurement under Temperature-Stress coupling condition.
In conjunction with Fig. 1, the confining pressure chamber 1 of the embodiment of the present invention includes confining pressure cylinder 3, pedestal 2 and axis pressure cylinder 8, wherein confining pressure
Cylinder 3 is mounted on the top of pedestal 2, and axis pressure cylinder 8 is mounted on the top of confining pressure cylinder 3, confining pressure cylinder 3, pedestal 2 and axis pressure cylinder 8
Confining pressure chamber 1 is surrounded, confining pressure load pipeline 5 is provided on pedestal, the outer end of confining pressure load pipeline 5 is provided with the outer peripheral surface of pedestal
On, the inner end of confining pressure load pipeline 5 and confining pressure chamber 1 communicate, be provided with gas exhaust piping 6 on axis pressure cylinder 8, gas exhaust piping 6 it is outer
End is arranged on the outer peripheral surface of axis pressure cylinder 8, and the inner end of gas exhaust piping 6 and confining pressure chamber 1 communicate, and can pass through gas exhaust piping in this way
6 and confining pressure load pipeline 5 mutual cooperation, in confining pressure chamber 1 inject convenient pressure hydraulic oil.
Further, in conjunction with Fig. 1, in the embodiment of the present invention, the top of pedestal 2 is provided with the first protrusion, first protrusion
Ladder is formed on pedestal 2, the lower end of confining pressure cylinder 3 is sleeved in first protrusion, between the lower end of confining pressure cylinder 3 and the first protrusion
It is provided with multiple-sealed circle, to guarantee leakproofness between the two；And the bottom of axis pressure cylinder 8 be provided with first protrusion it is corresponding
Second protrusion, the upper end of confining pressure cylinder 3 is sleeved in second protrusion, is also equipped between the upper end of confining pressure cylinder 3 and the second protrusion
Multiple-sealed circle, to guarantee leakproofness between the two；And the both ends of confining pressure cylinder 3 are acted against respectively on pedestal 2 and axis pressure cylinder 8,
It being connected between axis pressure cylinder 8 and pedestal 2 by the connecting screw 4 at multiple intervals, confining pressure cylinder 3 is arranged between multiple connecting screws 4,
To realize the assembly of confining pressure cylinder 3, pedestal 2 and axis pressure cylinder 8.
In conjunction with Fig. 1, in the embodiment of the present invention, cover board 7 is set on the top of axis pressure cylinder 8, is movably set with work in axis pressure cylinder 8
Plug 9, piston 9 are above-mentioned axially loaded mechanism, and the both ends difference activity of piston 9 passes through the bottom of cover board 7 and axis pressure cylinder 8,
Cover board 7, axis pressure cylinder 8 and piston 9 surround first axle pressure chamber 13, and axis pressure cylinder 8, the bottom of axis pressure cylinder 8 and piston 9 surround second
Axis presses chamber 24, and axis pressure load pipeline 10 is provided on cover board 7, and the outer peripheral surface of cover board 7 is arranged in the outer end of axis pressure load pipeline 10
On, the inner end of axis pressure load pipeline 10 and first axle pressure chamber 13 communicate, and axis pressure air pipe 11, axis pressure are provided on axis pressure cylinder 8
The outer end of gas exhaust piping 11 is arranged on the outer peripheral surface of axis pressure cylinder 8, and the inner end of axis pressure air pipe 11 and the second axis press 24 phase of chamber
It is logical, and, transfer pipeline is provided in piston 9,13 phase of chamber is pressed with confining pressure chamber 1 and first axle respectively in the both ends of transfer pipeline
It is logical, by pressing the mutual cooperation of load pipeline 10, axis pressure air pipe 11 and transfer pipeline to axis, it can control piston 9
Axial movement, to apply axial compressive force to rock, to carry out rock indirect tensile strength test.
Further, in conjunction with Fig. 1, in the embodiment of the present invention, cover board 7 can pass through multiple spaced fixing bolts
12, realize the connection of cover board 7 and axis pressure cylinder 8, and the bottom of cover board 7 also has a third protrusion, the upper end suit of axis pressure cylinder 8
In the third protrusion, it is also equipped with multiple-sealed circle between the upper end and third protrusion of axis pressure cylinder 8, to guarantee the sealing of the two
Property；In addition, multiple-sealed circle is equally also equipped between piston and axis pressure cylinder 8, to guarantee leakproofness between the two.
In conjunction with Fig. 1, in the embodiment of the present invention, the groove in the second load plate 17 and the first load plate 16 is arc groove,
And sample 14 is disk sample, when sample 14 is placed in test device, the central axis of sample 14 is horizontal direction, arc groove
The central axis of central axis and sample 14 is arranged in parallel, and sample 14 can be contacted with the first load plate 16 and 17 line of the second load plate, this
Sample, when the first load plate 16 applies axis pressure to sample, axial stress passes to sample 14 in the form of line load, and by axis
It is converted into the tensile stress inside sample to compression, destroys sample due to indirect tension.
Further, in conjunction with Fig. 1, in the embodiment of the present invention, the first load plate 16 and the opposite side of the second load plate 17
Between be arranged at intervals with multiple guide rods 18, one end of multiple guide rods is fixed in the second load plate 17, multiple guiding
The movable side for being inserted into opposite second load plate 17 of the first load plate 16 of the other end of bar, in this way can be to the first load plate
16 movement is oriented to, to guarantee the stability of the first load plate 16 operation.
In conjunction with Fig. 1, in the embodiment of the present invention, the equal pasted with high temperature-resistant foil gauge of the axial ends of sample 14, for obtaining examination
The process of deformation and failure of sample, and the surface of sample 14 and the outside of high temperature strain foil are coated with sealant 15, to avoid examination
Sample is directly contacted with hydraulic oil.
Further, in conjunction with Fig. 1, in the embodiment of the present invention, data line socket 19, data line are provided in confining pressure chamber 1
Socket 19 is connected with the high temperature resistant foil gauge of the axial ends of sample 14, and data line socket 19 is arranged on pedestal 2, for acquiring
The deformation information of high temperature strain foil, data cable channel is provided in pedestal 2, and the lateral surface of pedestal 2 is provided with data line transmission mouth
20, data line socket 19 and data line transmit the both ends that mouth 20 is separately positioned on data cable channel, are provided in data cable channel
The data line for connecting data line socket 19 and data line transmission mouth 20, is transmitted to external control system for sample deformation information.
In conjunction with Fig. 1, in the embodiment of the present invention, be enclosed on the outer peripheral surface of confining pressure cylinder 3 and be provided with heating element 21, for pair
Confining pressure chamber 1 heats, and is provided with thermocouple 23 in confining pressure chamber 1, and thermocouple 23 is fixed on pedestal 2, for supervising in real time
Survey 1 internal temperature of confining pressure chamber.In addition, the outside of test device is enclosed with insulation cover 22, for making device during the test
Constant temperature is kept, heat dissipation is reduced.
Based on rock indirect tensile strength test device under above-mentioned three-dimensional stress constraint, the embodiment of the invention also provides one
Rock indirect tensile strength test method under kind three-dimensional stress constraint.
Fig. 2 shows for the process of rock indirect tensile strength test method under a kind of three-dimensional stress constraint of the embodiment of the present invention
It is intended to, in conjunction with Fig. 2, which includes:
S1: providing sample 14 and above-mentioned test device, and specifically, which is the circle of diameter 50mm, height 25mm
Dish-type sample；
S2: sample 14 is placed between the first load plate 16 and the second load plate 17；
S3: horizontal stress that the hydraulic oil in adjustment confining pressure chamber 1 generates sample 14 and axially loaded mechanism are to examination
The axial stress that sample applies, until horizontal stress and axial stress balance, specifically:
The gas exhaust piping 6 for opening 1 top of confining pressure chamber, it is oil-filled to pressure indoor inside by confining pressure load pipeline 5, wait be vented
Pipeline 6 has hydraulic oil spilling, should close gas exhaust piping 6 in time；Confining pressure load pipeline 5 continues to pressurize, and answers to sample application level
Power, the hydraulic oil in confining pressure chamber 1 can be entered by the transfer pipeline of 9 bottom of piston in first axle pressure chamber 13, make axis pressure
Piston 9 inside cylinder 8 slowly moves down and generates axial stress, until reaching balance with 1 internal pressure of confining pressure chamber, at this time
Sample is in three-dimensional stress constraint, and keeps pressure constant by loading the servopump that pipeline 5 connects with confining pressure.
S4: the internal temperature of adjustment confining pressure chamber 1 is consistent with target temperature, and keeps specimen surface and its internal temperature equal
It is even, it specifically includes:
It is heated by heating element 21 to sample according to actual formation temperature environment, passes through the thermoelectricity inside confining pressure chamber 1
Even 23 real-time monitoring temperature, a period of time need to be kept by reaching target value to temperature, keep specimen surface and its internal temperature uniform.
S5: the first load plate 16 is continued by axially loaded mechanism to load axial compressive force, the first load plate 16 will be axial
Pressure is transmitted on sample 14 in the form of line load, and in the Internal reforming indirect tensile stress for sample 14 of sample 14；
S6: having to axial compressive force and obviously fall, and sample destroys, and stops load immediately, and off-test obtains axially loaded machine
The maximum axial pressure of structure；
S7: indirect tensile strength of the rock sample under three-dimensional stress constraint, formula are calculated according to formula are as follows:In formula, σ t is indirect tensile strength, and Pmax is the maximum axial pressure for obtaining axially loaded mechanism, and D is sample
Diameter, t are specimen height.
In conclusion rock indirect tensile strength test method under a kind of three-dimensional stress constraint provided by the present invention, by
Then sample is being subjected to the test of rock indirect tensile strength with the test device of confining pressure and axis pressure, it can be according to practically
Layer environment carries out the indirect tensile strength measurement under Temperature-Stress coupling condition, and testing procedure is simple, the change of available sample
Shape destructive process keeps test result more accurate, to practical rock engineering great significance for design.
Following illustrated embodiment is better embodiment of the invention, only is used to facilitate to illustrate the present invention, not to this hair
The bright limitation made under any form has usually intellectual in any technical field, if not departing from the proposed skill of the present invention
In the range of art feature, using the equivalent embodiment for locally changing or modifying made by disclosed technology contents, and
Without departing from technical feature content of the invention, in the range of still falling within the technology of the present invention feature.
Claims (10)
1. rock indirect tensile strength test method under a kind of three-dimensional stress constraint, which is characterized in that the test method includes:
There is provided sample (14) and test device, wherein the test device includes confining pressure chamber (1), axially loaded mechanism, the
One load plate (16) and the second load plate (17), the confining pressure chamber (1) is interior to can be filled with hydraulic oil, the axially loaded machine
Structure is mounted on the top of the confining pressure chamber (1), and the telescopic end of the axially loaded mechanism is operably in the confining pressure chamber
It stretches in room (1), first load plate (16) is arranged in the underface of the telescopic end of the axially loaded mechanism, and described second
Load plate (17) is fixed on the upside of the bottom of the confining pressure chamber (1), and second load plate (17) and described first adds
Support plate (16) is oppositely arranged, first load plate (16) and second load plate (17) it is opposite side setting it is fluted；
The sample (14) is placed between first load plate (16) and second load plate (17)；
The horizontal stress and the axially loaded machine that hydraulic oil in adjustment confining pressure chamber (1) generates the sample (14)
The axial stress that structure applies the sample, until the horizontal stress and the axial pressure balance；
The internal temperature for adjusting confining pressure chamber (1) is consistent with target temperature, and keeps the specimen surface and its internal temperature equal
It is even；
First load plate (16) is continued by the axially loaded mechanism to load axial compressive force, first load plate
(16) axial compressive force is transmitted in the form of load on the sample (14), and Internal reforming in the sample (14) is described
The indirect tensile stress of sample (14)；
Have to the axial compressive force and obviously fall, the sample destroys, and stops load immediately, and off-test obtains the axial direction
The maximum axial pressure of loading mechanism；
Indirect tensile strength of the rock sample under three-dimensional stress constraint, the formula is calculated according to formula are as follows:In formula, σ t is indirect tensile strength, and Pmax is the maximum axial pressure for obtaining the axially loaded mechanism, and D is
Specimen finish, t are specimen height.
2. rock indirect tensile strength test method, feature exist under a kind of three-dimensional stress constraint according to claim 1
In the confining pressure chamber (1) includes confining pressure cylinder (3), pedestal (2) and axis pressure cylinder (8), wherein the confining pressure cylinder (3) is mounted on
On the top of the pedestal (2), the axis pressure cylinder (8) is mounted on the top of the confining pressure cylinder (3), the confining pressure cylinder (3), institute
It states pedestal (2) and the axis pressure cylinder (8) surrounds the confining pressure chamber (1), confining pressure load pipeline is provided on the pedestal
(5), the outer end of confining pressure load pipeline (5) is provided on the outer peripheral surface of the pedestal, and the confining pressure loads the interior of pipeline (5)
End and the confining pressure chamber (1) communicate, and are provided with gas exhaust piping (6) on the axis pressure cylinder (8), outside the gas exhaust piping (6)
End is arranged on the outer peripheral surface of the axis pressure cylinder (8), and the inner end of the gas exhaust piping and the confining pressure chamber (1) communicate.
3. rock indirect tensile strength test method, feature exist under a kind of three-dimensional stress constraint according to claim 2
In setting cover board (7) on the top of the axis pressure cylinder (8), the axis pressure cylinder (8) is interior to be movably set with piston (9), the piston
It (9) is the axially loaded mechanism, activity passes through the cover board (7) and the axis pressure cylinder respectively at the both ends of the piston (9)
(8) bottom, the cover board (7), the axis pressure cylinder (8) and the piston (9) surround first axle pressure chamber (13), the axis pressure
Cylinder (8), the bottom of the axis pressure cylinder (8) and the piston (9) surround the second axis pressure chamber (24), are arranged on the cover board (7)
There is axis pressure load pipeline (10), the outer end of axis pressure load pipeline (10) is arranged on the outer peripheral surface of the cover board (7), described
The inner end of axis pressure load pipeline (10) and first axle pressure chamber (13) communicate, and are provided with axis pressure gas on the axis pressure cylinder (8)
The outer end of pipeline (11), the axis pressure air pipe (11) is arranged on the outer peripheral surface of the axis pressure cylinder (8), the axis pressure gas
The inner end of pipeline (11) and second axis pressure chamber (24) communicate, and are provided with transfer pipeline, the delivery pipe in the piston (9)
The both ends on road are communicated with the confining pressure chamber (1) and first axle pressure chamber (13) respectively.
4. rock indirect tensile strength test method, feature exist under a kind of three-dimensional stress constraint according to claim 2
In the sample (14) is disk sample, and the central axis of the sample (14) is horizontal direction.
5. rock indirect tensile strength test method, feature exist under a kind of three-dimensional stress constraint according to claim 4
In the equal pasted with high temperature-resistant foil gauge of axial ends of the sample (14), the surface of the sample (14) and the high temperature are answered
The outside for becoming piece is coated with sealant (15).
6. rock indirect tensile strength test method, feature exist under a kind of three-dimensional stress constraint according to claim 4
It is arc groove in, the groove, the central axis of the central axis of the arc groove and the sample is arranged in parallel, the sample
It can be contacted with first load plate and the second load printed line.
7. rock indirect tensile strength test method, feature exist under a kind of three-dimensional stress constraint according to claim 1
Multiple guide rods are arranged at intervals between the opposite side of, first load plate (16) and second load plate (17)
(18), one end of multiple guide rods is fixed on second load plate (17), multiple guide rods it is another
Hold the movable side for being inserted into relatively described second load plate (17) of first load plate (16).
8. rock indirect tensile strength test method, feature exist under a kind of three-dimensional stress constraint according to claim 5
In the confining pressure chamber (1) is interior to be provided with data line socket (19), the axis of the data line socket (19) and the sample (14)
It is connected to the high temperature resistant foil gauge at both ends, the data line socket (19) is arranged on the pedestal (2), in the pedestal (2)
It is provided with data cable channel, the lateral surface of the pedestal (2) is provided with data line transmission mouth (20), the data line socket (19)
The both ends of the data cable channel, the company of being provided in the data cable channel are separately positioned on data line transmission mouth (20)
Connect the data line of the data line socket (19) and data line transmission mouth (20).
9. rock indirect tensile strength test method, feature exist under a kind of three-dimensional stress constraint according to claim 2
In being enclosed with and be provided with heating element (21) on the outer peripheral surface of the confining pressure cylinder (3), is provided with heat in the confining pressure chamber (1)
Galvanic couple (23), thermocouple (23) fixed setting is on the base.
10. rock indirect tensile strength test method, feature exist under a kind of three-dimensional stress constraint according to claim 9
In the outside of the test device is enclosed with insulation cover (22).
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Application publication date: 20191119 |