CN209745717U - triaxial hydraulic fracture test device - Google Patents
triaxial hydraulic fracture test device Download PDFInfo
- Publication number
- CN209745717U CN209745717U CN201920586211.6U CN201920586211U CN209745717U CN 209745717 U CN209745717 U CN 209745717U CN 201920586211 U CN201920586211 U CN 201920586211U CN 209745717 U CN209745717 U CN 209745717U
- Authority
- CN
- China
- Prior art keywords
- sample
- pressure
- triaxial
- triaxial apparatus
- splitting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
the utility model belongs to the technical field of test equipment, and discloses a triaxial hydraulic fracture test device, which is provided with a triaxial apparatus; the triaxial apparatus is internally provided with a pressure chamber, the inside of the pressure chamber is fixed with a sample with a prefabricated crack inside, the lower end of the sample is communicated with a splitting pressure water inflow testing device on the left side of the triaxial apparatus through a first plastic pipe, and the bottom of the pressure chamber is communicated with a confining pressure ectosome variable measuring device on the right side of the triaxial apparatus through a second plastic pipe. The utility model discloses a left splitting pressure inflow testing arrangement of triaxial apparatus makes black ink slowly get into in the inside prefabricated crack of sample under certain pressure, form inner chamber pressure, the quality through measuring the ink changes and calculates the splitting inflow, become external air supply of measuring device through the confining pressure ectosome and exert certain pressure to the distilled water, make the sample consolidate under given pressure, through the change and the consolidation degree that the sample volume was measured to the change of throughput pressure measuring tank distilled water quality, the measuring accuracy is high.
Description
Technical Field
the utility model belongs to the technical field of test equipment, especially, relate to a triaxial water conservancy splitting test device.
Background
Currently, the closest prior art in the industry:
Hydraulic fracture is a physical phenomenon that cracks occur and propagate in rock or soil due to the rising of water pressure. Hydraulic fracture is a general term for physical phenomena such as crack and pore driven expansion, mutual interpenetration and the like existing in rock and soil bodies driven by high-pressure water flow or other liquid.
The purpose of the triaxial hydraulic fracture test is to learn about the hydraulic fracture law of the soil body under the confining pressure and to know about the hydraulic fracture failure mode. The influence of factors such as saturation, compactness, consolidation ratio, confining pressure, prefabricated seam size and water pressure loading rate of the clay core wall material on hydraulic fracture pressure is mainly researched.
in summary, the problems of the prior art are as follows:
(1) The hydraulic fracture test is carried out by adopting a drilled cylinder or square sample, cracks in actual engineering rarely have circular sections, the hydraulic fracture rule is researched by utilizing a hollow cylinder sample or a square sample, and the simulation methods are not suitable for the condition that a potential seepage weak surface exists in a core wall.
(2) The occurrence process of hydraulic fracture of the sample is observed through an observation window on the side face of the sample, but the simulated crack belongs to the problem of plane strain and cannot simulate the development of the crack in the trend direction.
The difficulty of solving the technical problems is as follows:
How to prefabricate the crack with set size in the sample, and the crack size in the sample does not change under the stress state; tracking the expansion of the crack, accurately obtaining the splitting water inflow and the sample volume change, and quantitatively evaluating the development of the crack.
The significance of solving the technical problems is as follows:
The tracking and quantitative description of the three-axis hydraulic fracture morphology and the evolution are realized, the clay core wall weak surface hydraulic fracture evolution mechanism is disclosed, the judgment criterion is established, an analysis method is provided for the hydraulic fracture problem of the earth-rock dam core wall material, and the research result has important theoretical significance and wide engineering application value.
SUMMERY OF THE UTILITY MODEL
to the problem that prior art exists, the utility model provides a triaxial water conservancy splitting test device.
The utility model discloses a realize like this, a triaxial water conservancy splitting test device is provided with:
A triaxial apparatus;
The inside pressure chamber that is provided with of triaxial apparatus, the inside sample that has prefabricated crack of inside area that is fixed with of pressure chamber, the sample lower extreme communicates with the left splitting pressure inflow testing arrangement of triaxial apparatus through first plastic tubing, the confined pressure ectosome that the pressure chamber bottom passes through second plastic tubing and triaxial apparatus right side becomes measuring device intercommunication.
Furthermore, splitting pressure inflow testing arrangement is provided with the first overhead tank that is equipped with black ink, and the stopper is equipped with on the first overhead tank, and first plastic tubing stretches into first overhead tank bottom, and first overhead tank places in first electronic balance upper end, first overhead tank upper end intercommunication and first air supply interface, and first air supply interface is provided with the governing valve.
further, the confining pressure ectosome becomes measuring device and is provided with the balancing stand, the balancing stand upper end is fixed with the carousel through the pivot, the dish of carousel is equipped with the steel strand wires along the outside cover, the second overhead tank that is equipped with the distilled water is hung to the steel strand wires left end, second overhead tank upper end and second air source interface intercommunication, second air source interface is provided with the governing valve, second overhead tank bottom and second plastic tubing intercommunication, the heavy object is hung to the steel strand wires other end, the heavy object lower extreme is connected with the tray that is equipped with the iron sand, the tray is placed in second balance upper end.
Further, the cover of sample outside is equipped with the rubber membrane, the seal groove has been seted up at sample bottom edge, and the seal groove intussuseption is filled with glass and glues, the sample lower extreme is spliced there is the plastic slab, wears to be equipped with in the middle of the plastic slab with the inside prefabricated crack intercommunication of sample, the sample upper end is spliced there is the sample cap, and sample cap upper end is concave to be equipped with triaxial apparatus matched with recess.
To sum up, the utility model discloses an advantage and positive effect do:
The utility model discloses a left splitting pressure inflow testing arrangement of triaxial apparatus makes black ink slowly get into in the inside prefabricated crack of sample under certain pressure, forms inner chamber pressure, calculates the splitting inflow through the mass change of measuring the ink, becomes external air supply of measuring device through the confining pressure ectosome and applys certain pressure to the distilled water, makes the sample consolidate under given pressure, passes through the change and the consolidation degree that the sample volume was measured to the change of throughput piezometric jar interior distilled water quality. The utility model discloses simple structure, the measuring accuracy is high.
Drawings
Fig. 1 is a schematic structural view of a triaxial hydraulic fracture testing apparatus provided in an embodiment of the present invention;
Fig. 2 is a schematic view of a sample structure provided by an embodiment of the present invention;
Fig. 3 is a schematic view of a sealing groove structure provided in an embodiment of the present invention;
Fig. 4 is a schematic structural view of a sample preparation mold provided in an embodiment of the present invention;
in the figure: 1. a triaxial apparatus; 2. a pressure chamber; 3. a sample cap; 4. a sample; 5. a sample base; 6. a first plastic tube; 7. a first pressure tank; 8. a first electronic balance; 9. a first air source interface; 10. adjusting a valve; 11. a second plastic tube; 12. a balancing stand; 13. a second electronic balance; 14. a tray; 15. a weight; 16. steel strand wires; 17. a turntable; 18. a second pressure tank; 19. a second gas source interface; 20. a plastic panel; 21. a plastic tube; 22. prefabricating a crack; 23. a steel plate; 24. a hexagon socket head cap screw; 25. a screw; 26. a butterfly nut; 27. sealing the groove.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings.
As shown in fig. 1 to fig. 3, the embodiment of the present invention provides a triaxial hydraulic fracture testing apparatus, which includes: the device comprises a triaxial apparatus 1, a pressure chamber 2, a sample cap 3, a sample 4, a sample base 5, a first plastic tube 6, a first pressure tank 7, a first electronic balance 8, a first air source interface 9, a regulating valve 10, a second plastic tube 11, a balance frame 12, a second electronic balance 13, a tray 14, a weight 15, a steel strand 16, a rotary table 17, a second pressure tank 18, a second air source interface 19, a plastic plate 20, a plastic tube 21, a prefabricated crack 22, a steel plate 23, an inner hexagonal screw 24, a screw 25, a butterfly nut 26 and a sealing groove 27.
the inside pressure chamber 2 that is provided with of triaxial apparatus 1, 2 inside sample 3 that are fixed with inside area prefabricated crack 22 of pressure chamber, 1 lower extreme of sample communicate with the 1 left splitting pressure inflow testing arrangement of triaxial apparatus through first plastic tubing 6, and 2 bottoms of pressure chamber communicate with the 1 right side confining pressure ectosome of triaxial apparatus through second plastic tubing 11 and become measuring device. Splitting pressure inflow testing arrangement is provided with the first overhead tank 7 that is equipped with black ink, and 7 end stoppers on the first overhead tank are equipped with, and first plastic tubing 6 stretches into 7 bottoms on the first overhead tank, and first overhead tank 7 is placed in 8 upper ends on the first electronic balance, and 7 upper ends on the first overhead tank communicate and first air supply interface 9, and first air supply interface 9 is provided with governing valve 10.
The confining pressure ectosome becomes measuring device and is provided with gimbal 12, gimbal 12 upper end is fixed with carousel 17 through the pivot, the dish of carousel 17 is equipped with steel strand wires 16 along the outside cover, 16 left ends of steel strand wires hang and are equipped with the second overhead tank 18 that is equipped with the distilled water, 18 upper ends of second overhead tank and second air source interface 19 intercommunication, second air source interface 19 is provided with the governing valve, 18 bottoms of second overhead tank and second plastic tubing 11 intercommunication, 16 other ends of steel strand wires hang and are equipped with heavy object 15, 15 lower extremes of heavy object are connected with tray 14 that is equipped with the iron sand, tray 14 is placed in 13 upper ends of second balance.
4 outside covers of sample are equipped with the rubber membrane, and 4 bottom edges of sample have seted up seal groove 27, and the seal groove intussuseption is filled with glass and has glued, and 4 lower extremes of sample have glued joint have plastic slab 20, wear to be equipped with in the middle of the plastic slab 20 with the plastic tubing 21 of 4 inside prefabricated cracks 22 intercommunications of sample, 4 upper ends of sample have glued joint have sample cap 3, and 3 upper ends of sample cap are concave to be equipped with the recess with triaxial apparatus 1 matched with.
the utility model discloses a theory of operation does:
A round small hole is formed in the middle of a plastic plate with the thickness of 5mm, a plastic pipe with the length of 15mm and the outer diameter of 8mm is adhered to the position of the small hole of the plastic plate through AB glue, the bottom of a sample is adhered to the plastic plate through the AB glue, the plastic pipe penetrates through the small hole and is inserted into a small amount of standard sand in a prefabricated crack, and filter paper is adhered to the plastic pipe to prevent the standard sand from leaking. Wrapping the sample with rubber film, and standing in a moisturizing jar for 12 hr until AB glue is completely cured. Then the sample is placed on a base of a triaxial apparatus, glass cement with a certain thickness is coated between the base and the plastic plate and between the top end of the sample and the sample cap, a little glass cement is also coated between the rubber film and the sample base and the sample cap, and the two ends of the sample are tightened by rubber hoops to prevent water leakage and air leakage. The plastic pipe at the bottom of the sample is connected with the splitting pressure water inflow testing device, and ink can enter the sample along the plastic pipe. Standing for 12 hours, and carrying out a test after the glass cement is solidified. After the AB glue and the glass cement are cured, a pressure chamber is installed, and a certain confining pressure is applied to the sample through an external body deformation measuring device (a gas-water conversion device) to solidify the sample. Readings of the high-precision electronic balance are taken at intervals, and when the readings are basically unchanged (such as the change rate is less than 0.1g/h), the consolidation is considered to be stable.
The pressure chamber filled with black ink of the splitting pressure water inflow testing device is connected with the crack filled with sand at the bottom of the sample through a conduit, and air in the conduit is exhausted before the test. The pressure regulating valve on the splitting pressure water inflow testing device is opened, the inner cavity pressure of 20kPa is firstly applied to the sample, and the black ink can be seen to slowly enter the interior of the sample along the plastic pipe. After pressure is applied once, the pressure is stabilized to be constant at the value, and when the reading change rate of a high-precision electronic balance on the splitting pressure water inflow testing device is less than 0.05g/min, the test is considered to be balanced, and the next stage of pressure can be applied. And analogizing until the sample is split, wherein the reading of the electronic balance is sharply reduced, and a large amount of ink is flushed out of the sample.
Each ink pressure increase was 20kPa in magnitude and each pressure reading and the stabilized reading from the electronic balance were recorded. And finally, the pressure of the sample when the sample is split is the hydraulic splitting pressure of the sample under the test condition. And after the test is finished, taking the sample off the triaxial apparatus base, placing the sample on a CT scanner for scanning, observing the distribution condition of the internal cracks of the sample, and comparing and analyzing the distribution condition with the sample before the test.
As shown in fig. 4, the sample preparation mold is formed by splicing three steel plates, two right-angle steel plates are connected through 6M 6 hexagon socket head cap screws to form a frame, and then are connected with a bottom plate through two movable M6 screw rods and two butterfly nuts to form a cuboid box with the size of 240mm × 240mm × 120mm (length × width × height). The thickness of the steel plate is 10mm, the steel plate belongs to a high-strength steel plate, and deformation can be avoided in the sample preparation process.
The specific sample preparation process is as follows:
(1) The square die is formed by the inner hexagonal screw and the butterfly nut, each screw nut is screwed by the inner hexagonal wrench and the common wrench, each contact surface reaches a tight thread joint state, and deformation caused by non-screwing in the sample preparation process is prevented. And a layer of lubricating oil is uniformly coated on the inner wall of the die, so that sample preparation and sample demoulding are facilitated.
(2) and preparing clay samples of the two river mouths according to the optimal water content. After the soil material is prepared, the soil material is placed into a closed plastic barrel and stands for 24 hours, so that the water content is uniform. The water content is measured before the test, and the water content measured at the last time is taken as the standard. The degree of compaction of the test piece was 98%, and the thickness of each layer after compaction was 30 mm. The height of each layer of soil material is strictly controlled before and after compaction, and the uniformity of the whole sample is ensured. And after each layer of soil material is hit, performing shaving treatment on the surface, and then pouring the next layer of soil material for compaction.
(3) When the height of the sample reaches 60mm, the surface of the sample is scraped, the next half of the soil material is filled, the surface of the next half of the soil material is leveled, two plastic plates with certain sizes and surfaces coated with vaseline are placed on the surface of the sample, the distance is measured by a ruler, the plastic plates are positioned at the correct positions, and then the other half of the soil material is filled, so that the plastic plates are ensured not to move when soil is added. And continuing to prepare the sample according to the steps until the sample is finished.
(4) After the sample is manufactured, the hexagon nut and the wing nut are unscrewed, and the mold is removed, as shown in fig. 2 (3). The demolded test piece was stood on a table, and divided into two rectangular parallelepiped test pieces having dimensions of 120mm × 120mm × 240mm (length × width × height) by a wire saw from the center. The center of a cuboid sample is found accurately, so that a plastic plate is just in the middle of the sample, the plastic plate is placed on a soil cutter, the cuboid sample is cut into a cylinder sample with the diameter of 101mm multiplied by H200mm by a soil cutter, a wire saw and other tools, and the cylinder sample is loaded into a circular mold with the corresponding size.
(5) The circular mold is fixed by a retainer, and the plastic plate is carefully and wingingly pulled out by pliers, so that a prefabricated gap is formed. And filling a certain amount of white standard sand into the prefabricated gap, and inserting and tamping the sand by using steel wires while filling to ensure that the sand is uniform and compact. And digging a sealing groove with the width of about 5mm and the depth of about 3mm on the periphery of the sample, and filling glass cement into the sealing groove for sealing and stopping water when the sample is installed. And sticking wet filter paper on the bottom surface of the sample after sand filling.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all the modifications and equivalents of the technical spirit of the present invention to any simple modifications of the above embodiments are within the scope of the technical solution of the present invention.
Claims (4)
1. the utility model provides a triaxial water conservancy splitting test device which characterized in that, triaxial water conservancy splitting test device is provided with:
A triaxial apparatus;
The inside pressure chamber that is provided with of triaxial apparatus, the inside sample that has prefabricated crack of inside area that is fixed with of pressure chamber, the sample lower extreme communicates with the left splitting pressure inflow testing arrangement of triaxial apparatus through first plastic tubing, the confined pressure ectosome that the pressure chamber bottom passes through second plastic tubing and triaxial apparatus right side becomes measuring device intercommunication.
2. The triaxial hydraulic fracture testing device of claim 1, wherein the fracture pressure water inflow testing device is provided with a first pressure tank filled with black ink, a sealing plug is plugged at the upper end of the first pressure tank, a first plastic pipe extends into the bottom of the first pressure tank, the first pressure tank is placed at the upper end of a first electronic balance, the upper end of the first pressure tank is communicated with a first air source interface, and the first air source interface is provided with a regulating valve.
3. The triaxial hydraulic fracture testing apparatus according to claim 1, wherein the confining pressure outer body variation measuring apparatus is provided with a balance frame, a rotating disc is fixed at the upper end of the balance frame through a rotating shaft, a steel strand is sleeved on the outer side of the disc of the rotating disc, a second pressure tank filled with distilled water is hung at the left end of the steel strand, the upper end of the second pressure tank is communicated with a second air source interface, a regulating valve is arranged at the second air source interface, the bottom of the second pressure tank is communicated with a second plastic pipe, a weight is hung at the other end of the steel strand, the lower end of the weight is connected with a tray filled with iron sand, and the tray is placed at the upper end of a second balance.
4. the triaxial hydraulic fracture testing device according to claim 1, wherein a rubber film is sleeved on the outer side of the sample, a sealing groove is formed in the edge of the bottom of the sample, glass cement is filled in the sealing groove, a plastic plate is connected to the lower end of the sample, a plastic pipe communicated with a prefabricated crack inside the sample is arranged in the middle of the plastic plate in a penetrating mode, a sample cap is connected to the upper end of the sample in a gluing mode, and a groove matched with a triaxial apparatus is concavely formed in the upper end of the sample cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920586211.6U CN209745717U (en) | 2019-04-26 | 2019-04-26 | triaxial hydraulic fracture test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920586211.6U CN209745717U (en) | 2019-04-26 | 2019-04-26 | triaxial hydraulic fracture test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209745717U true CN209745717U (en) | 2019-12-06 |
Family
ID=68721994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920586211.6U Active CN209745717U (en) | 2019-04-26 | 2019-04-26 | triaxial hydraulic fracture test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209745717U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111896384A (en) * | 2020-07-13 | 2020-11-06 | 河海大学 | Hydraulic fracture test device and test method for concrete member under triaxial stress |
| CN112698011A (en) * | 2021-01-27 | 2021-04-23 | 中国地质科学院地质力学研究所 | Centrifugal physical test model and test method for rainfall-induced ancient landslide resurgence |
| CN113092278A (en) * | 2021-04-02 | 2021-07-09 | 浙江中正岩土技术有限公司 | High-temperature gradient disposal weak soil gas splitting test device and using method thereof |
-
2019
- 2019-04-26 CN CN201920586211.6U patent/CN209745717U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111896384A (en) * | 2020-07-13 | 2020-11-06 | 河海大学 | Hydraulic fracture test device and test method for concrete member under triaxial stress |
| CN112698011A (en) * | 2021-01-27 | 2021-04-23 | 中国地质科学院地质力学研究所 | Centrifugal physical test model and test method for rainfall-induced ancient landslide resurgence |
| CN113092278A (en) * | 2021-04-02 | 2021-07-09 | 浙江中正岩土技术有限公司 | High-temperature gradient disposal weak soil gas splitting test device and using method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209745717U (en) | triaxial hydraulic fracture test device | |
| CN110160891B (en) | Shearing seepage coupling test device for accumulation body-rock interface | |
| CN106442154B (en) | Experimental rig and test method for simulation concrete basement rock contact surface hydraulic fracture characteristic | |
| CN206470272U (en) | Pneumatic slurry dehydration tester | |
| CN106442153B (en) | The experimental rig and test method of simulation concrete Dam Heel of Gravity Dam hydraulic fracture | |
| CN111896395B (en) | Soil and structure interface interaction parameter measuring device and method | |
| CN106840977A (en) | Slurry filling imitation device | |
| CN102323159A (en) | Permeameter for contact surface of soil and works at high stress, high hydraulic gradient, and large shear deformation | |
| CN108612073A (en) | A kind of high-speed railway foundation expansion soil expansion potentiality analyzer | |
| CN108663249B (en) | Preparation device and preparation method of non-cohesive soil sample for geotechnical test | |
| CN107907464B (en) | Device and method for measuring performance of permeable stone cement slurry for fracturing | |
| CN110702298B (en) | Experimental device for buoyancy measurement model of shield tunnel segment | |
| WO2020048071A1 (en) | Measurement system and method for falling head permeability coefficient | |
| CN108195739B (en) | Pressure-controlled seepage test mechanism and seepage time measuring device | |
| CN110687028A (en) | Testing device and testing method for water permeability resistance of high-performance concrete | |
| CN110346198B (en) | Triaxial remolded sample batch rapid preparation device and preparation method | |
| CN109283113B (en) | Concrete impermeability test device and test method for eliminating horizontal hoop pressure | |
| CN106468720A (en) | The thin magnetic force thixotropy generating meanss seeing flow observation and test method between granule | |
| CN215263505U (en) | Multilayer soil body seepage flow is stealthily lost coupling test device | |
| CN114923833B (en) | High osmotic concrete osmotic coefficient's survey device | |
| CN216791954U (en) | Migration and diffusion test device for double-medium soil body by MICP reaction solution | |
| CN206505073U (en) | It is a kind of to be used for supporting roadway surrounding rock and the similar materials experimental provision of deformation | |
| CN210375917U (en) | Triaxial remolded sample is preparation facilities fast in batches | |
| CN206038476U (en) | Modified slurry shield mud infiltration film forming analogue test device | |
| CN213842965U (en) | Test device for coupling of concrete internal pressure stress and water pressure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |