CN106442153B - The experimental rig and test method of simulation concrete Dam Heel of Gravity Dam hydraulic fracture - Google Patents
The experimental rig and test method of simulation concrete Dam Heel of Gravity Dam hydraulic fracture Download PDFInfo
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- CN106442153B CN106442153B CN201610845708.6A CN201610845708A CN106442153B CN 106442153 B CN106442153 B CN 106442153B CN 201610845708 A CN201610845708 A CN 201610845708A CN 106442153 B CN106442153 B CN 106442153B
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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
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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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
Abstract
The invention discloses the experimental rig and test method of simulation concrete Dam Heel of Gravity Dam hydraulic fracture, experimental provision includes mold, steel disc, pressure catheter, foil gauge, sealing device, moment of flexure bringing device, water pressure feedway and measurement acquisition instrument.Experimental method includes molding, pours sample, applies splitting hydraulic pressure, applies moment load and measure hydraulic pressure and Fracture Deformation in the seam in dehiscence process on the extensions path of crack.It pours test specimen and needs special die, it is therefore an objective to preset incipient crack and embedding pressure catheter on test specimen.The present invention realizes the real simulation of this weakness zone hydraulic fracture situation at Dam Heel of Gravity Dam.Truth can not be simulated by overcoming mechanical force in traditional diametral compression test, hydraulic pressure during simulation stress state is simple and test, the defects of strain data synchronous acquisition is difficult.
Description
Technical field
The present invention relates to a kind of hydraulic engineering experimental rig and test method, especially a kind of simulation concrete gravity dam
The experimental rig and test method of dam heel hydraulic fracture.
Background technique
Concrete hydraulic fracture refers to that crack occurs and extends under the action of water pressure.Concrete gravity dam dam heel position
There is thermal cracking equivalent damage in the construction process, tensile stress easily occur under the effect of water pressure of upstream, is the weak area of dam body
Domain, it is more prominent that the waterpower batch at the position splits problem.Existing waterpower batch splits research method and can be divided mainly into two classes: first is that adopting
With mechanical pressure simulated water pressure, this method can not real simulation high pressure water acted in crack because mechanical force is in the sample
Transfer mode is different from water pressure, and action direction is also different；Second is that the effect of simulated water pressure power, carries out under tension and compression stress condition
Concrete sample high-pressure hydraulic diametral compression test research, but such proof stress condition is simple, can not simulate the stress at dam heel
State.These existing test methods can not hydraulic fracture characteristic at preferable simulation concrete Dam Heel of Gravity Dam.
Summary of the invention
In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a kind of simulation concrete weights
The experimental rig of the experimental rig of power Ba Ba heel hydraulic fracture, the simulation concrete Dam Heel of Gravity Dam hydraulic fracture can objective simulation
The heel of concrete gravity dam dam is in the hydraulic fracture process under high hydraulic pressure effect, and the development process of measurement analysis incipient crack is ground
Study carefully the changing rule that crack developing stitches interior hydraulic pressure and fracture width in the process, can be widely used in hydraulic engineering.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of experimental rig of simulation concrete Dam Heel of Gravity Dam hydraulic fracture, including mold, steel disc, pressure catheter, answer
Become piece, sealing device, moment of flexure bringing device, water pressure feedway and measurement acquisition instrument.
Mold is used for the production of concrete sample, and concrete sample has prefabricated crack.
Mold includes bottom plate and four side walls, and four side walls and bottom plate are enclosed center cavity, the shape of center cavity
It is identical as the shape of concrete sample.
The corresponding top side wall in two positions of mold is each provided with a vertical openings；Steel disc can be placed in two and erect
It can remove into opening and from two vertical openings.
It is not provided on one of mould side wall of vertical openings and is provided with several holes；The height of several holes
Unequal, the highest hole height of holes in position is lower than the bottom level of vertical openings；One is provided in each hole to protrude into
Pressure catheter in the middle part of mold is provided with the rod iron that a position is fixed and can be removed in every pressure catheter.
Strain gauge adhesion is fixed on concrete sample, and the vertical fracture direction for testing concrete sample strains.
Sealing device, for the concrete sample for being pasted with foil gauge to be sealed；The setting of sealing device top center
There is inlet opening, which can be connected with the prefabricated crack of concrete sample.
Moment of flexure bringing device includes universal testing machine, upper steel seat and lower steel seat；Upper steel seat and lower steel seat are coaxially disposed, upper steel
Seat is connected with universal testing machine, can highly go up and down；Lower steel seat can pass through hinged-support and the sealing device for being provided with inlet opening
End face is connected.
Water pressure feedway includes that electricity adjusts pressure pump, aqueduct, input terminal hydraulic pressure sensor and several output end water
Pressure sensor；One end of aqueduct is protruded into the inlet opening of sealing device, and the other end of aqueduct adjusts pressure pump to be connected with electricity,
Input terminal hydraulic pressure sensor is arranged in the middle part of aqueduct, and each pressure catheter is all connected with an output end hydraulic pressure sensor.
Input terminal hydraulic pressure sensor, each output end hydraulic pressure sensor and foil gauge are connected with measurement acquisition instrument.
The steel disc side is provided with polishing cutting edge.
The mould inner wall face and steel disc two sides have been coated with release agent.
Being not provided with setting on one of mould side wall of vertical openings, there are five holes, and five holes are respectively positioned on same
In vertical straight line, the pitch of holes of five holes is equal.
The pitch of holes of five holes is 15mm, and the vertical range between the highest hole in position and vertical openings bottom is
10mm。
The present invention also provides a kind of test method of simulation concrete Dam Heel of Gravity Dam hydraulic fracture, the simulation concrete weights
The waterpower that the objective simulation concrete Dam Heel of Gravity Dam of test method energy of power Ba Ba heel hydraulic fracture is under high hydraulic pressure effect is split
Process is split, the development process of analysis incipient crack is measured, the variation of interior hydraulic pressure and fracture width is stitched during research crack developing
Rule can be widely used in hydraulic engineering.
A kind of test method of simulation concrete Dam Heel of Gravity Dam hydraulic fracture, includes the following steps:
Step 1, molding: preparing a uncovered and hollow rectangular mould, opposite in two positions of rectangular mould
A vertical openings are respectively arranged in the top side wall answered, and open on the one of cuboid mould side wall for being not provided with vertical openings
If several holes；The height of several holes is unequal, and the highest hole height of holes in position is high lower than the bottom of vertical openings
Degree.
Step 2, concrete sample pours: in two vertical openings that steel disc is inserted and placed in step 1, Mei Gekong
Embedding pressure catheter protruded into the middle part of rectangular mould in hole, be inserted into every pressure catheter a position fix and
The rod iron that can be removed.Then, ready-mixed concrete pours into the concrete stirred evenly in the hollow reservoir of rectangular mould, and
Vibration compacting extracts steel disc after waiting 2-3 hours, forms the incipient crack of concrete sample；After pouring 24 hours, by coagulation
Native test specimen is demoulded and is conserved, and is extracted the rod iron in pressure catheter, is conserved.
Step 3, it fills sample: pasting fixed foil gauge on the concrete sample side wall that step 2 maintenance is completed, then will paste
There is the concrete sample of foil gauge to be placed in sealing device, make at the top of the incipient crack and sealing device of concrete sample into
Water hole is connected；Then, the aqueduct in water pressure feedway is inserted into inlet opening, and seals fixation；Output end hydraulic pressure
Sensor is connected with corresponding pressure catheter respectively；Finally, by foil gauge, input terminal hydraulic pressure sensor and each output end water
Pressure sensor is successively connected with measurement acquisition instrument；Water pressure feedway can apply the level perpendicular to prefabricated fracture faces
To pressure.
Step 4, it tests: the sealing device that step 3 dress sample is completed being inverted, makes the inlet opening of sealing device downward, then,
Sealing device bottom after inversion is connected by hinged-support with lower steel seat, by moment of flexure bringing device upper steel seat with it is omnipotent
Testing machine is connected, and applies axis pressure by universal testing machine, axis pressure can be converted to moment of flexure by upper steel seat and lower steel seat；By this
The combination of moment of flexure and horizontal direction pressure is able to achieve the real simulation of Dam Heel of Gravity Dam stress state；Water pressure feedway mentions
For hydraulic pressure, the deformation of foil gauge, input terminal hydraulic pressure sensor and output end hydraulic pressure sensor successively real-time measurement concrete sample
The hydraulic pressure output valve and the water pressure inside concrete sample that feature, electricity adjust pressure pump；Acquisition instrument is measured by foil gauge, defeated
Enter to hold the real-time measuring data of hydraulic pressure sensor and output end hydraulic pressure sensor to be acquired and record.
Step 5, hydraulic fracture analysis: applied by the hydraulic pressure and moment of flexure bringing device that change the supply of water pressure feedway
Axis pressure, tested several times, until concrete sample is destroyed；The real-time measurement number that measurement acquisition instrument will be tested every time
According to being acquired and recording, consequently facilitating analyzing the Hydraulic Fracturing Mechanism at Dam Heel of Gravity Dam.
In the step 2, steel disc is before being inserted into two vertical openings, and the side of steel disc first carries out polishing and coated release
Agent.
In the step 2, before pouring into rectangular mould, cuboid mould inner wall is coated with the concrete stirred evenly
There is release agent.
In the step 1, the length, width and height of rectangular mould are respectively 300*150*150mm, are not provided with vertical openings
There are five holes, five holes to be respectively positioned in same vertical straight line for setting on one of mould side wall, the hole of five holes
Spacing is equal and is 15mm, and the vertical range between the highest hole in position and vertical openings bottom is 10mm.
In the step 3, is respectively pasted on two corresponding side walls of concrete sample and fix four foil gauges, coagulation
Four foil gauges on the native same side wall of test specimen arrange along the extending direction of incipient crack in straight line, top it is a piece of
Foil gauge is arranged at the bottom of incipient crack, and the clear distance between four foil gauges is followed successively by 5mm, 8mm and 10mm.
The present invention has the following beneficial effects: using the above structure and after method
1. overcome by provide mechanical force carry out Hydraulic fracturing test defect, using experimental rig of the present invention with
Method can simulate high water head effect, more identical with Practical Project.
2. by rational mechanics principle, above-mentioned moment of flexure bringing device can convert axis pressure to the moment of flexure at crack location,
The moment of flexure belongs to four-point supporting moment of flexure, realizes concrete sample internal stress state by being depressed into the variation of drawing, concrete sample
Bending moment effect is pressurized in natural axis above section, the part tension below natural axis, thus preferably simulated gravity Ba Ba heel
The stress state at place.
3. test input hydraulic pressure is freely adjustable and controls, the stress state inside sample is controllable.In addition, being capable of real-time acquisition
The test datas such as load, hydraulic pressure, strain, it is convenient that Hydraulic Fracturing Mechanism is analyzed.
Detailed description of the invention
Fig. 1 is the structural representation of mold in a kind of experimental rig of simulation concrete Dam Heel of Gravity Dam hydraulic fracture of the present invention
Figure.
Fig. 2 is strain gauge adhesion and pressure catheter arrangement schematic diagram on concrete sample.
Fig. 3 is the structural schematic diagram of sealing device.
Fig. 4 is the structural schematic diagram of moment of flexure bringing device.
Fig. 5 is the test process schematic of the experimental rig of simulation concrete Dam Heel of Gravity Dam hydraulic fracture.
Wherein have: 1, mold；2, steel disc；3, pressure catheter；4, hole；5, vertical openings；6, rod iron；7, concrete tries
Part；8, prefabricated crack；9, foil gauge；10, sealing device；11, watertight rubber；12, inlet opening；13, upper steel seat；14, lower steel
Seat；15, hinged-support；16, support positioning jack；17, electricity adjusts pressure pump；18, input terminal hydraulic pressure sensor；19, output end hydraulic pressure
Sensor；20, acquisition instrument is measured.
In addition, the dimensional units marked in Fig. 2 are mm.
Specific embodiment
Xia Mianjiehefutuhejuti compare Jia Shishifangshiduibenfamingzuojinyibuxiangxishuoming.
As shown in Figures 1 to 5, a kind of experimental rig of simulation concrete Dam Heel of Gravity Dam hydraulic fracture, including mold 1,
Steel disc 2, pressure catheter 3, foil gauge 9, sealing device 10, moment of flexure bringing device, water pressure feedway and measurement acquisition instrument
20。
Mold is used for the production of concrete sample 7, and concrete sample has prefabricated crack 8.
Mold includes bottom plate and four side walls, and four side walls and bottom plate are enclosed center cavity, the shape of center cavity
It is identical as the shape of concrete sample.Mold is preferably hollow rectangular mould, and the length, width and height difference of rectangular mould is preferred
It for 300*150*150mm, but may be other shapes.
The corresponding top side wall in two positions of mold is each provided with a vertical openings 5；Steel disc can be placed in two
It can remove in vertical openings and from two vertical openings.In addition, steel disc side is preferably provided with polishing cutting edge, for guiding
Crack expansion direction.
Further, above-mentioned mould inner wall face and steel disc two sides are preferably coated with release agent, are convenient for subsequent concrete
The demoulding of test specimen.
It is not provided on one of mould side wall of vertical openings and is provided with several holes 4；The height of several holes
Spend unequal, bottom level of the highest hole height of holes in position lower than vertical openings；One is provided in each hole to stretch
Enter the pressure catheter in the middle part of mold, the rod iron 6 that a position is fixed and can be removed is provided in every pressure catheter.
As shown in Fig. 2, the quantity of above-mentioned hole is preferably five, five holes are respectively positioned in same vertical straight line, five
The pitch of holes of a hole is equal, and both preferably 15mm, the vertical range between the highest hole in position and vertical openings bottom
For 10mm.
Foil gauge 9 is pasted and fixed on concrete sample, and the vertical fracture direction for testing concrete sample strains.
Sealing device 10, for the concrete sample for being pasted with foil gauge to be sealed；Sealing device is preferably by several
Block sealing steel plate is enclosed, and watertight rubber 12 is filled at stitching portion and gap.The setting of sealing device top center
There is inlet opening 12, which can be connected with the prefabricated crack of concrete sample.
Moment of flexure bringing device includes universal testing machine, upper steel seat 13 and lower steel seat 14.Upper steel seat and lower steel seat are coaxially disposed,
Upper steel seat is connected with universal testing machine, can highly go up and down；Lower steel seat can pass through hinged-support and the sealing for being provided with inlet opening
Device end face is connected.
By rational mechanics principle, above-mentioned moment of flexure bringing device can convert axis pressure to the moment of flexure at crack location, should
Moment of flexure belongs to four-point supporting moment of flexure, realizes concrete sample internal stress state by being depressed into the variation of drawing, concrete sample by
Moment is pressurized in natural axis above section, the part tension below natural axis, thus preferably at simulated gravity Ba Ba heel
Stress state.
Several support positioning jacks 16 are preferably provided on lower steel seat, each support positioning jack can be with hinged-support phase
Cooperation.The support positioning jack that different location is arranged may be implemented to apply identical moment and the shearing inside concrete sample
It is different.
Water pressure feedway includes that electricity adjusts pressure pump 17, aqueduct, input terminal hydraulic pressure sensor 18 and several outputs
Hold hydraulic pressure sensor 19.One end of aqueduct is protruded into the inlet opening of sealing device, and the other end and electricity of aqueduct adjust pressure pump
It is connected, input terminal hydraulic pressure sensor is arranged in the middle part of aqueduct, and each pressure catheter is all connected with an output end hydraulic pressure sensing
Device.
Water pressure feedway can provide the target hydraulic pressure of the controllable rate of climb according to test demand, and record hydraulic pressure in real time
Value.
Input terminal hydraulic pressure sensor, output end hydraulic pressure sensor and foil gauge are connected with measurement acquisition instrument.
A kind of test method of simulation concrete Dam Heel of Gravity Dam hydraulic fracture, includes the following steps:
Step 1, molding: preparing a uncovered and hollow rectangular mould, opposite in two positions of rectangular mould
A vertical openings are respectively arranged in the top side wall answered, and open on the one of cuboid mould side wall for being not provided with vertical openings
If several holes；The height of several holes is unequal, and the highest hole height of holes in position is high lower than the bottom of vertical openings
Degree.
The length, width and height of above-mentioned rectangular mould are respectively preferably 300*150*150mm, are not provided with vertical openings wherein
It is preferably provided on one mould side wall there are five hole, five holes are respectively positioned in same vertical straight line, the hole of five holes
Spacing is equal and is 15mm, and the vertical range between the highest hole in position and vertical openings bottom is 10mm.
Step 2, concrete sample pours: first polish and coated release agent by the side of steel disc, in rectangular mould
Wall is also coated with release agent, demoulds convenient for subsequent concrete sample.Then, two steel disc is inserted and placed in step 1
In vertical openings, embedding pressure catheter protruded into the middle part of rectangular mould in each hole, in every pressure catheter
It is inserted into the rod iron that a position is fixed and can be removed, to form hydraulic pressure conduction pathway.Then, ready-mixed concrete, stirring is equal
Even concrete pours into the hollow reservoir of rectangular mould, and vibration compacting, and steel disc is extracted after waiting 2-3 hours, is formed mixed
The incipient crack of solidifying soil test specimen；After pouring 24 hours, concrete sample is demoulded, extracts the rod iron in pressure catheter,
It is conserved, curing time is preferably 28 days.
The judgment method of vibration compacting after above-mentioned concreting are as follows: surface model slurry, there is no bubbles to emerge, and was vibrating
Concrete is replenished in time after concrete material decline in Cheng Zhongxu, smooth out surface after vibrating.
Step 3, it fills sample: pasting fixed foil gauge on the concrete sample side wall that step 2 maintenance is completed.Foil gauge glues
Patch method is preferred are as follows: respectively pastes on two corresponding side walls of concrete sample and fixes four foil gauges, concrete sample
Extending direction of four foil gauges along incipient crack on same side wall is in straight line arrangement, a piece of foil gauge of top
It is arranged at the bottom of incipient crack, the clear distance between four foil gauges is followed successively by 5mm, 8mm and 10mm.
Then the concrete sample for being pasted with foil gauge is placed in sealing device, has padded watertight rubber, make concrete
The incipient crack of test specimen is connected with the inlet opening at the top of sealing device.Meanwhile closed incipient crack, spiral shell is tightened after fitting is closely knit
Bolt carries out fixation.Then, by the aqueduct insertion inlet opening in water pressure feedway, sealing is tightened, little water is provided
The gas in concrete sample is discharged in amount.Output end hydraulic pressure sensor is connected with corresponding pressure catheter respectively；Finally,
Foil gauge, input terminal hydraulic pressure sensor and each output end hydraulic pressure sensor are successively connected with measurement acquisition instrument；Hydraulic pressure
Power feedway can provide horizontal direction pressure to concrete sample, and high pressure water is full of prefabricated crack, and hydraulic pressure is perpendicular to fracture faces
Concrete.
During filling sample, it should be noted the sealing of high pressure water, water-stop glue band can be swathed in leakage area.
Step 4, it tests: the sealing device that step 3 dress sample is completed being inverted, makes the inlet opening of sealing device downward, then,
Sealing device bottom after inversion is connected by hinged-support with lower steel seat, by moment of flexure bringing device upper steel seat with it is omnipotent
Testing machine is connected, and applies axis pressure by universal testing machine, axis pressure can be converted to moment of flexure by upper steel seat and lower steel seat；By this
The combination of moment of flexure and horizontal direction pressure is able to achieve the real simulation of Dam Heel of Gravity Dam stress state；Water pressure feedway mentions
For hydraulic pressure, the deformation of foil gauge, input terminal hydraulic pressure sensor and output end hydraulic pressure sensor successively real-time measurement concrete sample
The hydraulic pressure output valve and the water pressure inside concrete sample that feature, electricity adjust pressure pump；Acquisition instrument is measured by foil gauge, defeated
Enter to hold the real-time measuring data of hydraulic pressure sensor and output end hydraulic pressure sensor to be acquired and record.
Step 5, hydraulic fracture analysis: applied by the hydraulic pressure and moment of flexure bringing device that change the supply of water pressure feedway
Axis pressure, tested several times, until concrete sample is destroyed；The real-time measurement number that measurement acquisition instrument will be tested every time
According to being acquired and recording, consequently facilitating analyzing the Hydraulic Fracturing Mechanism at Dam Heel of Gravity Dam.
The present invention realizes the real simulation of this weakness zone hydraulic fracture situation at Dam Heel of Gravity Dam.Overcome tradition
Mechanical force can not simulate truth in diametral compression test, hydraulic pressure, strain data during simulation stress state is simple and test
The defects of synchronous acquisition is difficult.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail a variety of equivalents can be carried out to technical solution of the present invention within the scope of the technical concept of the present invention, this
A little equivalents all belong to the scope of protection of the present invention.
Claims (10)
1. a kind of test method of simulation concrete Dam Heel of Gravity Dam hydraulic fracture, characterized by the following steps:
Step 1, molding: preparing a uncovered and hollow rectangular mould, corresponding in two positions of rectangular mould
A vertical openings are respectively arranged in top side wall, if opening up on the one of cuboid mould side wall for being not provided with vertical openings
Dry hole；The height of several holes is unequal, and the highest hole height of holes in position is lower than the bottom level of vertical openings；
Step 2, concrete sample pours: in two vertical openings that steel disc is inserted and placed in step 1, in each hole
Embedding pressure catheter protruded into the middle part of rectangular mould is inserted into a position in every pressure catheter and fixes and can move
The rod iron removed；
Then, ready-mixed concrete pours into the concrete stirred evenly in the hollow reservoir of rectangular mould, and vibration compacting,
Steel disc is extracted after waiting 2-3 hours, forms the incipient crack of concrete sample；After pouring 24 hours, by concrete sample into
Row demoulding and maintenance, extract the rod iron in pressure catheter, are conserved；
Step 3, it fills sample: pasting fixed foil gauge on the concrete sample side wall that step 2 maintenance is completed, then will be pasted with and answer
The concrete sample for becoming piece is placed in sealing device, makes the inlet opening at the top of the incipient crack and sealing device of concrete sample
It is connected；Then, the aqueduct in water pressure feedway is inserted into inlet opening, and seals fixation；Output end hydraulic pressure sensing
Device is connected with corresponding pressure catheter respectively；Finally, foil gauge, input terminal hydraulic pressure sensor and each output end hydraulic pressure are passed
Sensor is successively connected with measurement acquisition instrument；Water pressure feedway can apply the horizontal direction pressure perpendicular to prefabricated fracture faces
Power；
Step 4, it tests: the sealing device that step 3 dress sample is completed is inverted, the inlet opening for making sealing device downward, then, will fall
The sealing device bottom postponed is connected by hinged-support with lower steel seat, by the upper steel seat and universal test in moment of flexure bringing device
Machine is connected, and applies axis pressure by universal testing machine, axis pressure can be converted to moment of flexure by upper steel seat and lower steel seat；Pass through the moment of flexure
With the combination of horizontal direction pressure, that is, it is able to achieve the real simulation of Dam Heel of Gravity Dam stress state；Water pressure feedway provides water
Pressure, foil gauge, input terminal hydraulic pressure sensor and output end hydraulic pressure sensor successively the deformation behaviour of real-time measurement concrete sample,
The hydraulic pressure output valve and the water pressure inside concrete sample that electricity adjusts pressure pump；Acquisition instrument is measured by foil gauge, input terminal
The real-time measuring data of hydraulic pressure sensor and output end hydraulic pressure sensor is acquired and records；
Step 5, hydraulic fracture analysis: the axis applied by the hydraulic pressure and moment of flexure bringing device that change the supply of water pressure feedway
Pressure, is tested several times, until concrete sample is destroyed；Measure acquisition instrument the real-time measuring data tested every time is equal
It is acquired and records, consequently facilitating analyzing the Hydraulic Fracturing Mechanism at Dam Heel of Gravity Dam.
2. the test method of simulation concrete Dam Heel of Gravity Dam hydraulic fracture according to claim 1, it is characterised in that: institute
It states in step 2, steel disc is before being inserted into two vertical openings, and the side of steel disc first carries out polishing and coated release agent.
3. the test method of simulation concrete Dam Heel of Gravity Dam hydraulic fracture according to claim 1, it is characterised in that: institute
It states in step 2, for the concrete stirred evenly before pouring into rectangular mould, cuboid mould inner wall has been coated with release agent.
4. the test method of simulation concrete Dam Heel of Gravity Dam hydraulic fracture according to claim 1, it is characterised in that: institute
It states in step 1, the length, width and height of rectangular mould are respectively 300*150*150mm, are not provided with one of mould of vertical openings
Having setting on side wall, there are five hole, five holes are respectively positioned in same vertical straight line, the pitch of holes of five holes it is equal and
It is 15mm, the vertical range between the highest hole in position and vertical openings bottom is 10mm.
5. the test method of simulation concrete Dam Heel of Gravity Dam hydraulic fracture according to claim 1, it is characterised in that: institute
It states in step 3, is respectively pasted on two corresponding side walls of concrete sample and fix four foil gauges, concrete sample is same
Extending direction of four foil gauges along incipient crack on side wall arranges that a piece of foil gauge of top is arranged in straight line
At the bottom of incipient crack, the clear distance between four foil gauges is followed successively by 5mm, 8mm and 10mm.
6. a kind of experimental rig of simulation concrete Dam Heel of Gravity Dam hydraulic fracture, it is characterised in that:
It is tested using the test method of any one of the claim 1-5 simulation concrete Dam Heel of Gravity Dam hydraulic fracture；
The experimental rig of simulation concrete Dam Heel of Gravity Dam hydraulic fracture, including mold, steel disc, pressure catheter, foil gauge, sealing
Device, moment of flexure bringing device, water pressure feedway and measurement acquisition instrument；
Mold is used for the production of concrete sample, and concrete sample has prefabricated crack；
Mold includes bottom plate and four side walls, and four side walls and bottom plate are enclosed center cavity, the shape of center cavity and mixed
The shape of solidifying soil test specimen is identical；
The corresponding top side wall in two positions of mold is each provided with a vertical openings；Steel disc can be placed in two and vertically open
It can remove in mouthful and from two vertical openings；
It is not provided on one of mould side wall of vertical openings and is provided with several holes；The height of several holes is not
Equal, the highest hole height of holes in position is lower than the bottom level of vertical openings；It is provided with one in each hole and protrudes into mold
The pressure catheter at middle part is provided with the rod iron that a position is fixed and can be removed in every pressure catheter；
Strain gauge adhesion is fixed on concrete sample, and the vertical fracture direction for testing concrete sample strains；
Sealing device, for the concrete sample for being pasted with foil gauge to be sealed；Sealing device top center be provided with into
Water hole, the inlet opening can be connected with the prefabricated crack of concrete sample；
Moment of flexure bringing device includes universal testing machine, upper steel seat and lower steel seat；Upper steel seat and lower steel seat are coaxially disposed, upper steel seat with
Universal testing machine is connected, and can highly go up and down；Lower steel seat can pass through hinged-support and the sealing device end face for being provided with inlet opening
It is connected；
Water pressure feedway includes that electricity adjusts pressure pump, aqueduct, input terminal hydraulic pressure sensor and several output end hydraulic pressure to pass
Sensor；One end of aqueduct is protruded into the inlet opening of sealing device, and the other end of aqueduct adjusts pressure pump to be connected with electricity, is inputted
Hydraulic pressure sensor is held to be arranged in the middle part of aqueduct, each pressure catheter is all connected with an output end hydraulic pressure sensor；
Input terminal hydraulic pressure sensor, each output end hydraulic pressure sensor and foil gauge are connected with measurement acquisition instrument.
7. the experimental rig of simulation concrete Dam Heel of Gravity Dam hydraulic fracture according to claim 6, it is characterised in that: institute
It states steel disc side and is provided with polishing cutting edge.
8. the experimental rig of simulation concrete Dam Heel of Gravity Dam hydraulic fracture according to claim 6, it is characterised in that: institute
It states mould inner wall face and steel disc two sides and has been coated with release agent.
9. the experimental rig of simulation concrete Dam Heel of Gravity Dam hydraulic fracture according to claim 6, it is characterised in that: not
Being provided with setting on one of mould side wall of vertical openings, there are five holes, five holes to be respectively positioned on same vertical straight line
On, the pitch of holes of five holes is equal.
10. the experimental rig of simulation concrete Dam Heel of Gravity Dam hydraulic fracture according to claim 9, it is characterised in that:
The pitch of holes of five holes is 15mm, and the vertical range between the highest hole in position and vertical openings bottom is 10mm.
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| CN110954407B (en) * | 2018-09-26 | 2023-05-16 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for testing concrete fracture process under different hydraulic pressure effects |
| CN109470578B (en) * | 2018-12-28 | 2024-02-27 | 内蒙古工业大学 | Test device and test method for regulating low-temperature environment |
| CN109765115A (en) * | 2019-03-05 | 2019-05-17 | 中国水利水电科学研究院 | A kind of bituminous concrete Hydraulic fracturing test device and method |
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