CN113758849A - Fracture simulation structure, fracture flowing water plugging test device and method - Google Patents
Fracture simulation structure, fracture flowing water plugging test device and method Download PDFInfo
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- CN113758849A CN113758849A CN202110903322.7A CN202110903322A CN113758849A CN 113758849 A CN113758849 A CN 113758849A CN 202110903322 A CN202110903322 A CN 202110903322A CN 113758849 A CN113758849 A CN 113758849A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention relates to a crack simulation structure, a crack flowing water plugging test device and a crack flowing water plugging test method, and belongs to the technical field of crack plugging tests. The device can realize the grouting plugging test of various crack opening degrees and angles under the tidal action and provide guidance for grouting and plugging water in the coastal karst area.
Description
Technical Field
The invention belongs to the technical field of fracture plugging tests, and particularly relates to a fracture simulation structure, a fracture flowing water plugging test device and a fracture flowing water plugging test method.
Background
With the rapid development of the global economy and regional economy integration, the coastal cities with obvious regional advantages and precious resources have become key areas for the rapid development of regional economy in the ocean big development era at present. The coastal karst fractured zone is used as a typical geological type of a coastal area, induces the increasing of geological disasters such as surface subsidence, water inrush and mud inrush, has strong destructiveness, and becomes a prominent problem in the field of geological disaster prevention and control.
Although grouting is used as a common disposal method for geotechnical engineering disasters, the diffusion plugging mechanism and rule of grout in karst fractures and other structures are still in the initial stage of exploration, and the research on grouting filling and water-moving plugging mechanism of the karst structures in coastal areas is deficient.
At present, the fracture flowing water plugging test device has a plurality of problems: the structure used for simulating the fracture can not realize the adjustment of the fracture opening degree and can not simulate various working conditions; the sealing effect is poor, and the self weight of the upper surface of the crack causes sinking, so that the error of the test result is large; the cleaning of the inside of the crack is complex and the working procedure is complicated.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a fracture simulation structure, a fracture flowing water plugging test device and a fracture flowing water plugging test method.
The embodiment of the invention provides a crack simulation structure which comprises a first die and a second die which are mutually buckled, wherein a crack is formed in a gap between the first die and the second die, grooves are formed in the two sides of the center line of the crack on the top surface of the first die, protrusions are arranged on the bottom surface of the second die, the protrusions are inserted into the grooves and are in sealing connection with the inner walls of the grooves, the protrusions can be pulled out of the grooves, and gaskets can be placed in the grooves to control the insertion depth of the protrusions so as to adjust the gap between the first die and the second die.
Furthermore, deviate from a plurality of reinforcement ribs of fixedly connected with in the one side that sets up the recess on the second mould, be equipped with a plurality of rings on the reinforcement rib, be connected with the lifting rope on every ring.
Furthermore, the second mould is provided with a grouting hole, and the surface of the first mould, which is attached to the second mould, is provided with a monitoring hole for placing a pressure sensor.
Further, the first mold and the second mold are made of transparent materials.
Further, sealing rubber strips are filled between the first mold and the second mold along two side edges in the extending direction of the crack.
The embodiment of the invention also provides a crack flowing water plugging test device which comprises a tide simulation system, a grouting system and any crack simulation structure, wherein the tide simulation system comprises a water tank, the water tank is provided with a water outlet, the water outlet is connected with an inlet of a crack, a sinking block is arranged in the water tank, the regular rising and falling of the water level in the water tank can be realized by controlling the uniform rising and falling of the sinking block at different speeds, the grouting system comprises a grouting pump and a grouting pipeline, and the grouting pump is communicated with the crack through the grouting pipeline.
Further, the first die and the second die are horizontally placed on the base, the bottom of the base is connected with a plurality of lifters, each lifter can be independently controlled, and the height and the gradient of the base can be adjusted by adjusting the plurality of lifters.
Furthermore, a suspension frame is fixedly connected to the base, a cross beam is arranged on the suspension frame, the lifting rope is fixed to the cross beam, and a jack for driving the cross beam to move up and down is arranged on the suspension frame.
Further, a camera is installed at an outlet of the crack, and the diffusion plugging form of the slurry in the whole grouting process is acquired through the camera.
The embodiment of the invention also provides a test method based on the fracture flowing water plugging test device, which comprises the following steps:
according to the working condition of simulating the crack, selecting a gasket with corresponding thickness to be placed in the groove, then inserting the protrusion of the lower die into the groove of the lower die, and simultaneously installing sealing strips on the edges of the lower die and the upper die;
injecting water into the water tank, and controlling the sinking body in the water tank to move up and down in a reciprocating manner, so that the water level of the water tank regularly rises and falls to simulate tide, and meanwhile, the water in the water tank can enter a gap;
and when water in the water tank enters the gap, grouting is started, the diffusion plugging state of the slurry in the grouting process is observed, and the test is ended after the grouting requirement is met.
The invention has the following beneficial effects:
the crack simulation structure provided by the invention is inserted into the groove on the first die through the bulge on the second die and is in sealing connection with the inner wall of the groove, so that on one hand, the sealing property between the upper die and the lower die can be improved, and the liquid flowing into the crack can not leak from two sides in the direction of the central line of the crack, and on the other hand, gaskets with different thicknesses can be selected in the groove on the first die to lift the height of the second die and adjust the distance between the first die and the second die, so that the cracks with different opening degrees can be simulated. The height adjuster of the base of the device can be adjusted to control the inclination angle of the crack and simulate different working conditions.
According to the fracture flowing water plugging device provided by the invention, the inlet of the fracture is connected with the water tank, water is flushed into the fracture by controlling the lifting of the sinking block in the water tank and adjusting the water level change at a speed rate, and meanwhile, grouting can be performed into the fracture, so that the condition of the fracture flowing water plugging under the action of coastal tides can be realized.
Drawings
FIG. 1 is a general schematic view of a fracture flowing water plugging test device provided by an embodiment of the invention;
FIG. 2 is a schematic diagram illustrating a simulation of a fracture simulation structure in a fracture flowing water plugging test device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an upper crack mold in the crack flowing water plugging test device provided by the embodiment of the invention.
Wherein: 1-device base, 2-lifter, 3-sealing rubber strip, 4-monitoring hole, 5-water tank, 6-drain hole, 7-sinking block, 8-lifting cable, 9-lifting device, 10-rigid frame, 11-suspension frame, 12-suspension beam, 13-suspension rope, 14-grouting hole, 15-pressure sensor, 16-jack, 17-upper die, 18-lower die, 19-crack, 20-reinforcing rib, 21-high-speed camera, 22-grouting system, 23-grouting pipe, 24-groove, 25-gasket, 26-lifting ring and 27-protrusion.
Detailed Description
As shown in fig. 1, an embodiment of the present invention provides a fracture flowing water plugging test device, which mainly includes a fracture simulation structure, a grouting system, and a tidal simulation system.
The crack simulation structure mainly comprises an upper die 17 and a lower die 18, wherein the upper die 17 and the lower die 18 are mutually attached and buckled together, the upper die 17 and the lower die 18 are both horizontally arranged, a certain gap is formed between the upper die 17 and the lower die 18, the gap is a crack 19, the crack is provided with a crack inlet and a crack outlet, the tide simulation system is communicated with the crack inlet, the real seawater flood and tide process can be simulated by controlling the tide simulation system, the seawater of flood and tide is injected into the crack, meanwhile, the grouting system is communicated with the inside of the crack, and when water enters the crack, the grout can be injected into the crack.
Referring to fig. 2, in this embodiment, protrusions 27 are disposed on the left and right sides of the bottom surface of the upper mold 17 along the extending direction of the crack, a groove 24 is disposed on the top surface of the lower mold 18, wherein the protrusion of the upper mold 17 can be clamped into the groove, the protrusion is connected with the inner wall of the groove in a sealing manner, and the protrusion can be inserted into or pulled out of the groove, the sealing property between the protrusion and the groove needs to be ensured during the clamping or pulling-out process, gaskets 25 with different thicknesses can be placed in the groove to adjust the clamping depth of the protrusion, so as to adjust the opening degree of the crack, and after the plugging test of the crack is completed, the upper mold can be directly pulled out of the lower mold, and then the upper mold and the lower mold can be directly cleaned, which is convenient for cleaning.
Therefore, the crack simulation structure provided by the embodiment is inserted into the groove in the lower die through the protrusion on the upper die and is connected with the inner wall of the groove, so that on one hand, the sealing property between the upper die and the lower die can be improved, and the liquid flowing into the crack can not leak from the two sides of the crack extending direction, and meanwhile, on the other hand, the upper die can be lifted by gaskets with different thicknesses in the groove of the lower die, so that cracks with different opening degrees can be simulated.
As shown in fig. 1, a plurality of reinforcing ribs 20 are arranged on the top surface of the upper die in the embodiment at intervals, each reinforcing rib is provided with a plurality of hanging rings 25, the hanging rings 25 can be connected with a hanging rope, so that the upper die 17 can be hung by hanging the hanging rings 25, and meanwhile, the reinforcing ribs on the top surfaces can prevent the upper die from sinking due to bending caused by the self weight of the upper die 17 in the hanging process, and are also favorable for washing the binding surfaces of the upper die and the lower die by hanging the upper die after a test.
In order to facilitate observation of the internal condition of the crack, a transparent material, for example, a transparent acrylic plate, may be used between the upper die 17 and the lower die 18 in this embodiment, so that the internal condition of the crack may be conveniently observed in the process of performing a plugging test on the crack.
In order to further ensure the sealing performance of the crack, it is assumed that the space between the protrusions on the upper and lower sides of the upper mold or the space between the grooves on the upper and lower sides of the lower mold is the inner side, and the outer side of the matching place between the protrusions and the grooves between the upper and lower molds in this embodiment, that is, the edges of the two sides along the extending direction of the crack between the upper and lower molds are filled with the sealing rubber strips 3.
Further, in the present embodiment, the simulated fracture structure of the upper mold 17 and the lower mold 18 is placed on a base 1, wherein four corners of the bottom of the base 1 are respectively provided with a lifter 2, and the height of the whole base can be controlled by adjusting the lifting height of the lifters 2.
The lifters 2 can be lifted by threaded bolts or lifted by hydraulic cylinders, wherein each lifter 2 is independently controlled, and the inclination of the whole base can be controlled by adjusting part of the lifters 2, so that the angle of the crack is changed.
In this embodiment the top of base 1 is equipped with one and suspends frame 11 in midair be equipped with one on the frame 11 in midair and suspend crossbeam 12, go up the mould and consolidate rings on the rib and hang in midair on the crossbeam 12 through the lifting rope suspend in midair crossbeam 12 length direction's both ends respectively with suspend in midair the frame 11 junction welding have jack 16, can control through this jack 16 and suspend in midair crossbeam 12 and go up and down, realize the hoist and mount between mould and the bed die, can avoid like this carrying out the crooked sinking that the shutoff test in-process leads to because the dead weight of last mould itself.
As shown in fig. 1, the upper mold is provided with a grouting hole 14, and the grouting system 22 in this embodiment includes a grouting pump, a grouting pipeline, and a grouting mixer, wherein the grouting mixer is connected to the grouting hole 14 of the upper mold through the grouting pipeline, the grouting pump pumps the grout through the grouting pipeline, the grout fully reacts through the grouting mixer, and finally the grout is pumped into the crack through the grouting hole 14 of the upper mold.
The tide simulation system in the embodiment mainly comprises a water tank 5, a steel frame 10 is arranged at the top of the water tank 5, a lifting device 9 is arranged on the steel frame 10, the lifting device 9 is connected with a sinking block 7 through a lifting cable 8, the sinking block 7 can move up and down in the water tank 5, the sinking block 7 is controlled to move up and down through the lifting device 9 so as to simulate the existing tide situation,
the bottom of the water tank is provided with a drain hole 6, water source supply can be continuously carried out in the test process through the drain hole 6, and the water can be timely discharged after the test is finished.
The dynamic water plugging test device in the embodiment further comprises an information acquisition system, the information acquisition system is composed of a pressure sensor 15 and a high-speed camera 21, a monitoring hole 4 is formed in the top surface of the lower die, the pressure sensor 15 in the information acquisition system is installed in the monitoring hole 4, pressure changes in the grouting process can be acquired through the pressure sensor 15, and the high-speed camera 21 is installed on the left side of the base, namely the tail of the crack, so that the diffusion plugging form of the slurry in the whole grouting process can be clearly acquired.
Therefore, according to the fracture flowing water plugging device provided by the embodiment, the inlet of the fracture is connected with the water tank, water is flushed into the fracture by controlling the lifting of the sinking block in the water tank and adjusting the water level change through speed, and meanwhile, grouting can be performed into the fracture, so that the condition of the fracture flowing water plugging under the action of coastal tides can be realized. The following describes in detail a test method based on the above-mentioned fracture running water plugging device, which comprises the following processes:
1. an upper hoisting ring 26 on the top surface of an upper mould in the simulated crack structure is connected with a suspension cross beam 12 on the base through a suspension cable 13, and then the upper surface of the crack is hoisted through a jack 16 on the cross beam.
2. According to the simulated working condition, different crack opening degrees are selected, a filler strip 25 with the corresponding thickness is placed in a groove 24 in the lower die, then the protrusion of the upper die is tightly embedded into the groove 24 in the lower die through controlling a suspension system, and finally the sealing strip 3 is installed at the edge of the test platform.
3. According to different working conditions, the lifting regulator 2 of the control base is designed with different crack angles for testing.
4. The pressure sensor 15 is arranged in the monitoring hole 4 on the surface of the lower die, the high-speed camera 21 is placed at the tail part of the testing device, and the slurry plugging and spreading process is recorded.
5. The water tank 5 is filled with a certain amount of water through the supplementary drain hole 6, and then the tidal elevating device 9 is operated to adjust the water level elevating process. In this process, the monitoring elements such as the pressure sensor 15 are also calibrated.
6. And preparing grout, connecting a grouting pipeline 23 with a grouting opening 14 on the surface 17 of the upper die, and determining the proportion of various grout.
7. And starting the tide simulation system, starting grouting after the water level change rule of the water tank 5, and finishing the test after the grouting requirement is met.
8. Stopping grouting, and cleaning the grouting pipeline 23 and the grouting pump. The upper mould 17 is raised by means of a suspension system to clear the slurry from the crevices.
9. And processing information such as test monitoring data, video and the like.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. The utility model provides a crack simulation structure, includes the first mould and the second mould of mutual lock, and clearance between first mould and the second mould forms the crack, its characterized in that, the top surface of first mould is equipped with the recess in the both sides of crack central line, and the bottom surface of second mould is equipped with the arch, the arch is inserted in the recess, and with the inner wall sealing connection of recess, the arch can extract in the recess, thereby can place the gasket in the recess and come the clearance of control bellied depth of insertion adjustment between first mould and the second mould.
2. The fracture simulation structure of claim 1, wherein a plurality of reinforcing ribs are fixedly connected to a surface of the second mold facing away from the groove, the reinforcing ribs are provided with a plurality of hanging rings, and each hanging ring is connected with a lifting rope.
3. A fracture simulation structure according to claim 1, wherein the second mold is provided with a grouting hole, and the surface of the first mold, which is in contact with the second mold, is provided with a monitoring hole for placing a pressure sensor.
4. A fracture simulating structure according to claim 1 wherein the first mold and the second mold are of transparent material.
5. A crack simulating structure according to claim 1, characterised in that a sealing bead is filled between the first mould and the second mould at both side edges of the centre line of the crack.
6. The crack flowing water plugging test device is characterized by comprising a tide simulation system, a grouting system and the crack simulation structure as claimed in any one of claims 1 to 5, wherein the tide simulation system comprises a water tank, a water outlet is formed in the water tank, the water outlet is connected with an inlet of a crack, a sinking block is arranged in the water tank, the water level in the water tank can be regularly fluctuated by controlling the uniform ascending and descending of the sinking block at different speeds, the grouting system comprises a grouting pump and a grouting pipeline, and the grouting pump is communicated with the crack through the grouting pipeline.
7. A fracture simulation structure according to claim 6, wherein the first mold and the second mold are horizontally placed on a base, a plurality of lifters are connected to a bottom of the base, each lifter can be independently controlled, and a height and an inclination of the base can be adjusted by adjusting the plurality of lifters.
8. The fracture simulation structure of claim 7, wherein a suspension frame is fixedly connected to the base, a cross beam is arranged on the suspension frame, the lifting rope is fixed to the cross beam, and a jack for driving the cross beam to move up and down is arranged on the suspension frame.
9. The fracture flowing water plugging test device according to claim 6, wherein a camera is installed at an outlet of the fracture, and the diffusion plugging form of the slurry in the whole grouting process is collected through the camera.
10. The test method of the fracture running water plugging test device based on any one of claims 6-9, characterized by comprising the following processes:
according to the working condition of simulating the crack, selecting a gasket with corresponding thickness to be placed in the groove, then inserting the protrusion of the lower die into the groove of the lower die, and simultaneously installing sealing strips on the edges of the lower die and the upper die;
injecting water into the water tank, and controlling the sinking body in the water tank to move up and down in a reciprocating manner, so that the water level of the water tank regularly rises and falls to simulate tide, and meanwhile, the water in the water tank can enter a gap;
and when water in the water tank enters the gap, grouting is started, the diffusion plugging state of the slurry in the grouting process is observed, and the test is ended after the grouting requirement is met.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114563311A (en) * | 2021-12-28 | 2022-05-31 | 西安建筑科技大学 | Migration and diffusion test device and test method for double-medium soil body by MICP reaction solution |
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| CN114563311A (en) * | 2021-12-28 | 2022-05-31 | 西安建筑科技大学 | Migration and diffusion test device and test method for double-medium soil body by MICP reaction solution |
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