CN111060400B - Device for testing extruding process of coral sand around expansion pile by CT (computed tomography) and using method - Google Patents

Device for testing extruding process of coral sand around expansion pile by CT (computed tomography) and using method Download PDF

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CN111060400B
CN111060400B CN201911417218.6A CN201911417218A CN111060400B CN 111060400 B CN111060400 B CN 111060400B CN 201911417218 A CN201911417218 A CN 201911417218A CN 111060400 B CN111060400 B CN 111060400B
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coral sand
test cylinder
testing
window
sheet
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CN111060400A (en
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刘杰
孙涛
周预非
田港
贺梦玲
李洪亚
高素芳
黎照
唐洪宇
谢晓康
李运舟
杜卓兴
石谦
杨浩宇
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China Three Gorges University CTGU
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
    • G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
    • 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
    • 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
    • G01N3/06—Special adaptations of indicating or recording means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N2021/8411—Application to online plant, process monitoring
    • 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
    • G01N2203/0058—Kind of property studied
    • G01N2203/0076—Hardness, compressibility or resistance to crushing
    • G01N2203/0087—Resistance to crushing
    • 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
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0298—Manufacturing or preparing specimens
    • 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
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
    • 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
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0676—Force, weight, load, energy, speed or acceleration
    • 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
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0682—Spatial dimension, e.g. length, area, angle
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00—Investigating materials by wave or particle radiation
    • G01N2223/03—Investigating materials by wave or particle radiation by transmission
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00—Investigating materials by wave or particle radiation
    • G01N2223/60—Specific applications or type of materials
    • G01N2223/616—Specific applications or type of materials earth materials

Abstract

The invention discloses a device for testing the squeezing process of coral sand around an expansion pile by CT and a using method thereof, aiming at the problems that the crushing process of coral sand particles is inconvenient to observe and the stressed crushing characteristic of the coral sand cannot be well summarized, by observing the crushing process of the coral sand under the action of expansion concrete with different concentrations of an expanding agent, the invention simulates the pile-forming crushing stress mechanism and mechanical response of the coral sand in practical engineering, can quantitatively research the mechanical response and deformation conditions of the coral sand under the action of different grades of force and different directions of load, and by researching the corresponding relation among the compression sedimentation amount, the shape, the grain diameter and the load value of the coral sand in the experimental process, the crushing characteristic of the coral sand under the stressed condition is obtained. The observation problem of the coral sand crushing process under the stress condition is solved, the mechanical response and deformation conditions of the coral sand under different grades and different direction loads are obtained, and the method has wide engineering practice significance and application prospect for researching and summarizing the coral sand stress crushing characteristics.

Description

Device for testing extruding process of coral sand around expansion pile by CT (computed tomography) and using method
Technical Field
The invention relates to the field of crushing characteristic test equipment under the condition of coral sand stress, in particular to a device for testing the coral sand extrusion process around an expansion pile by CT and a use method thereof.
Background
The open sea engineering construction is mostly far away from the continent and is inconvenient to transport, and if a ship is used for transporting natural gravels from the continent, the construction cost is increased, the construction period is prolonged, and the open sea engineering construction and development are adversely affected. Therefore, how to effectively utilize coral sand existing in a large amount in an island to serve for open sea engineering is a problem which needs to be solved urgently in order to use marine building materials as much as possible.
Coral sand is the main foundation soil on coral reefs, and the properties of the coral sand are obviously different from those of common land-source sand, and mainly caused by different factors such as chemical components, formation history, carrying conditions and the like. The consolidation settlement period of the coral sand foundation after blow filling of the land area of the island reef in the open sea is short, and it can be expected that the foundation of the island reef building structure will be settled to a certain extent. The coral sand has the characteristics of high edge angle, multiple gaps (containing internal pores), irregular shape and the like, so that the coral sand has the characteristics of low strength and easy breakage, and the engineering characteristics of the coral sand are obviously different from those of common land-source sand. In addition, coral sand particles are easy to generate particle breakage at pile tip stress layers and other positions under high pressure, so that soil layer compressibility is increased and strength is softened, a foundation is greatly deformed, and the whole structure is finally damaged due to instability.
Aiming at the characteristics that coral sand particles are low in strength and easy to break, but the breaking process of the coral sand particles is not easy to observe comprehensively, and further the stress breaking characteristics of the coral sand cannot be summarized well, the device and the testing technology for researching and developing the CT test of the coral sand pile-forming breaking process are provided.
Disclosure of Invention
The invention aims to provide a device for testing the squeezing process of coral sand around an expansion pile by CT and a using method thereof, aiming at the characteristics of high edge angle, multiple gaps (containing internal pores), irregular shape and the like of the coral sand, by observing the crushing process of the coral sand under the action of expansion concrete with different concentrations of an expanding agent, simulating the crushing stress mechanism and mechanical response of the coral sand pile in practical engineering, quantitatively researching the mechanical response and deformation conditions of the coral sand under the action of different equal-grade forces and different-direction loads, and researching the corresponding relation among the compression sedimentation amount, the shape, the grain diameter and the load value of the coral sand in the experimental process, thereby obtaining the crushing characteristic of the coral sand under the stress condition. The observation problem of coral sand crushing process under the stress condition is effectively solved, the mechanical response and deformation conditions of coral sand under different grades of force and different direction loads can be obtained, effective reference materials are provided for research and summary of coral sand stress crushing characteristics, and the method has wide engineering practice significance and application prospect.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a device for testing the extruding process of coral sand around an expansion pile by CT comprises a testing cylinder with openings on the upper and lower surfaces, wherein the upper and lower surfaces of the testing cylinder are in contact fit with a cover plate; the outer surface of the test cylinder is wrapped with carbon fiber cloth; a reserved pipe is arranged in the test cylinder, and the circle center of the reserved pipe is the same as that of the test cylinder; filling coral sand into the gap between the reserved pipe and the test cylinder, and filling expansion concrete slurry into the reserved pipe; a plurality of sensing positioning sheets are uniformly arranged in the test cylinder in the transverse and longitudinal directions; the sensing positioning sheet is connected with external terminal equipment, and the terminal equipment comprises a computer and a CT machine.
The pipe wall of the test tube is provided with a plurality of holes at equal intervals along the vertical direction, and the tops of the holes are provided with grooves.
The surface of the cover plate is provided with a circular groove, a slotted hole is formed in the groove, and the test cylinder is matched with the groove; threaded holes are formed in four corners of the cover plate, and the two cover plates on the upper bottom surface and the lower bottom surface are connected through threaded rods and nuts.
The pressure sensing positioning sheet comprises a PC strip sheet, a pressure sensing sheet is arranged on the surface of the PC strip sheet, and a PC wafer is arranged at the head of the pressure sensing sheet; and a round silica gel pad is arranged between the PC wafer and the head of the pressure sensing wafer.
A window is arranged in the hole on the wall of the testing bobbin; the window is a hollow transparent block-shaped structure made of PC materials, a plurality of micro night vision cameras are arranged in the window at equal intervals, and connecting wires of the micro night vision cameras extend out of the grooves at the tops of the holes in the pipe wall of the test tube and are connected with a computer.
The head of the window is arc-shaped and is matched with the arc surface of the reserved hole of the test cylinder.
The use method of the device for testing the extruding process of coral sand around the expansion pile by CT comprises the following steps:
step 1: preparing materials: preparing a testing cylinder, a reserved pipe, a transparent acrylic plate, carbon fiber cloth, a pressure sensing sheet, a threaded rod, a window, a micro night vision camera, insulating glue, AB glue, a round silica gel pad, a large adhesive tape, a pc sheet, coral sand, expanded concrete grout, a computer, a CT machine and other equipment;
step 2: cutting the test cylinder: cutting a test cylinder with the diameter of 25cm and the height of 40cm, and then forming holes in the wall of the test cylinder at intervals of 10cm from the bottom;
step 3: installing a window: the length of the window is 7.5cm, the side length of the window is 2.5cm, the window is a pc material hollow transparent block, a micro night vision camera is arranged in the window every 2.5cm, the total number of the three cameras is three, and the head of the window where the micro night vision camera is placed is bonded with a hole opening on the wall of the test cylinder by AB glue;
step 4: wrapping with carbon fiber cloth: a test cylinder with the height of 40cm and the diameter of 25cm is used as a carrier, carbon fiber cloth is matched with AB glue to form a high-strength side limit, and the carbon fiber cloth at the window part is cut off by scissors;
step 5: bonding the bottom of the test cylinder: placing the bottom of the test cylinder into a groove on a transparent cover plate, bonding and fixing the test cylinder by using AB glue, and filling the groove with insulating glue;
step 6: placing a reserved pipe: placing the reserved pipe into the test cylinder to enable the circle center of the reserved pipe to be consistent with the circle center of the test cylinder;
step 7: manufacturing a pressure sensing positioning sheet: adhering 502 glue on a PC strip sheet with the width of 2cm and the length of 15cm, adhering a round silica gel pad with the same size on the stress head of the pressure sensing sheet by using 502 glue, adhering a PC round sheet with the diameter of 2cm on the head of the pressure sensing sheet by using 502 glue, and finally winding and fixing by using a large adhesive tape to form a pressure sensing positioning sheet;
step 8: placing a pressure sensing positioning sheet: horizontally arranging 1 pressure sensing positioning sheet every 10cm vertically from the bottom of coral sand and expanded concrete slurry, and arranging 4 pressure sensing positioning sheets in total; dividing the same cross section of a sample into five circle layers with the radiuses of 2.5cm, 5cm, 7.5cm, 10cm and 12.5cm on a horizontal plane of 30cm, and respectively arranging 5 pressure sensing positioning sheets on each circle layer in the transverse direction and the longitudinal direction in two directions;
step 9: pouring the expanded concrete slurry: pouring the expanded concrete slurry with the well-prepared content of the expanding agent into the reserved pipe, and then slowly rotating and pulling out the reserved pipe;
step 10: three CT scans of coral sand were performed, which were: first scanning: just pouring concrete into the container, and when the concrete is in a liquid state; and (3) second scanning: after 3h, the concrete is initially set; and (3) third scanning: after 21 days, after the concrete is finally set;
step 11: the coral sand crushing characteristic under the stress condition is obtained by studying the corresponding relation between the compression settlement amount, the shape, the grain diameter and the load value of the coral sand in the experimental process.
The invention has the following beneficial effects:
1. wrap up carbon cloth on the test section of thick bamboo, because carbon cloth tensile strength is strong, can provide great binding power for the test section of thick bamboo, prevent that the test section of thick bamboo from being destroyed by the inflation concrete inflation.
2. AB glue can let test section of thick bamboo and transparent cover plate connect together, fills up the recess with the insulating cement, prevents that the liquid in the grout from flowing out from the gap.
3. The window is a cuboid with high strength and high transparency, and the camera can observe the crushing condition of the coral sand in four directions on the same horizontal plane; the head of window is hollow, can let the connecting wire of miniature camera head stretch out the section of thick bamboo and be connected with the computer, can realize the broken real time monitoring of coral sand.
4. The camera be miniature night vision camera, can clearly record the broken process of coral sand under the dark condition.
5. The apertures reserved at the four corners of the transparent cover plate can prevent the stress release of the expansive concrete slurry, and a circular groove is formed in the surface of the transparent cover plate and can prevent the test cylinder from sliding in a dislocation manner. The acrylic plate is a transparent high-strength acrylic plate, and aims to ensure that the deformation and the broken area condition of the filler in the test cylinder can be observed and monitored in real time in the experimental process and prevent self breakage.
6. The reserved pipe can reserve a hole under the condition that the test cylinder is filled with coral sand, and the hole diameter can be changed by replacing the reserved pipes with different diameters, so that the coral sand crushing phenomenon under different-diameter expansion anchoring bodies can be researched.
7. The pressure sensing pieces are arranged in the radial direction and the annular direction of different circle layers of the horizontal plane, the radial and annular expansion concrete expansion stress of different circle layers on the same horizontal plane and the extrusion force to coral sand can be measured, the vertical concrete expansion stress and the pressure to coral sand can be measured by arranging the pressure sensing pieces in the vertical different circle layers, and the transmission process of the expansion concrete pile physical force in the coral sand can be obtained through research.
8. The PC strip can position the pressure sensor, and the pressure sensor is prevented from changing position under the action of expansion.
9. The round silica gel pad can transmit the force borne by the PC round piece to the pressure sensing piece completely.
10. The top of the testing cylinder is provided with a groove, so that a connecting line of the pressure sensing positioning sheet in the cylinder body can be pulled out to be connected with a computer.
11. The control test is carried out by using the expansive concrete with different contents of the expansive agents, so that the crushing condition of the coral sand around the pile under different contents of the expansive agents can be measured.
12. The compaction and compaction conditions of the expansive concrete slurry in different stages in the barrel on the coral sand around the pile can be observed through three-stage CT scanning.
Drawings
FIG. 1 is a schematic overall view of the apparatus of the present invention;
FIG. 2 is a schematic top view of a transparent cover plate of the apparatus of the present invention;
FIG. 3 is a schematic side view of the side pressure sensing plate and window arrangement of the device of the present invention;
FIG. 4 is a schematic view of the top and bottom pressure sensing splines of the device of the present invention;
FIG. 5 is a schematic view of the pressure-sensing positioning plate of the device of the present invention.
The reference numbers in the figures are: the device comprises a test cylinder 1, a cover plate 2, carbon fiber cloth 3, coral sand 4, a pressure sensing piece 5, expanded concrete slurry 6, a threaded rod 7, a window 8, a micro night vision camera 9, a round silica gel pad 10, a PC round piece 11, a PC strip piece 12, a reserved pipe 13, a pressure sensing positioning piece 14, a nut 15 and a terminal device 16.
Detailed Description
As shown in fig. 1-5, a device for testing the extrusion process of coral sand 4 around an expansion pile by CT comprises a test cylinder 1 with openings on the upper and lower surfaces, wherein the upper and lower surfaces of the test cylinder 1 are in contact fit with a cover plate 2; the outer surface of the test cylinder 1 is wrapped with carbon fiber cloth 3; a reserved pipe 13 is arranged in the test cylinder 1, and the circle center of the reserved pipe 13 is the same as that of the test cylinder 1; coral sand 4 is filled in the gap between the reserved pipe 13 and the test cylinder 1, and the expansion concrete grout 6 is filled in the reserved pipe 13; a plurality of sensing positioning sheets are uniformly arranged in the test cylinder 1 in the transverse and longitudinal directions; the sensing positioning sheet is connected with an external terminal device 16, and the terminal device 16 comprises a computer and a CT machine.
Preferably, the pipe wall of the test tube 1 is provided with a plurality of holes at equal intervals along the vertical direction, and the tops of the holes are provided with grooves.
Preferably, the surface of the cover plate 2 is provided with a circular groove, a slotted hole is formed in the groove, and the test cylinder 1 is matched with the groove; threaded holes are formed in four corners of the cover plate 2, and the two cover plates 2 on the upper bottom surface and the lower bottom surface are connected through threaded rods 7 and nuts 15.
Preferably, the pressure sensing positioning sheet 14 comprises a PC strip 12, the surface of the PC strip 12 is provided with the pressure sensing sheet 5, and the head of the pressure sensing sheet 5 is provided with a PC wafer 11; a silica gel pad 10 is arranged between the PC wafer 11 and the head of the pressure sensing sheet 5.
Preferably, a window 8 is arranged in a hole on the pipe wall of the test cylinder 1; the window 8 is a hollow transparent block-shaped structure made of PC material, a plurality of micro night vision cameras 9 are arranged in the window 8 at equal intervals, and connecting wires of the micro night vision cameras 9 extend out of grooves in the tops of the holes in the pipe wall of the test tube 1 and are connected with a computer.
Preferably, the head of the window 8 is arc-shaped and is matched with the arc surface of the reserved hole of the test cylinder 1.
Preferably, the use method of the device for testing the squeezing process of the coral sand 4 around the expansion pile by CT comprises the following steps:
step 1: preparing materials: preparing a testing cylinder 1, a reserved pipe 13, a transparent acrylic plate, carbon fiber cloth 3, a pressure sensing sheet 5, a threaded rod 7, a window 8, a micro night vision camera 9, insulating glue, AB glue, a round silica gel pad 10, a large adhesive tape, a pc sheet, coral sand 4, expanded concrete grout 6, a computer, a CT machine and other equipment;
step 2: cutting the test cylinder 1: cutting a test cylinder 1 with the diameter of 25cm and the height of 40cm, and then forming holes in the wall of the test cylinder every 10cm from the bottom;
step 3: installation window 8: preferably, the window 8 is a pc-material hollow transparent block with the length of 7.5cm and the side length of 2.5cm, the interior of the block is provided with one micro night vision camera 9 every 2.5cm, the total number of the three cameras is three, and the head of the window 8 with the micro night vision camera 9 is bonded with a hole opening on the wall of the test cylinder 1 by AB glue;
step 4: wrapping carbon fiber cloth 3: a test cylinder 1 with the height of 40cm and the diameter of 25cm is used as a carrier, carbon fiber cloth 3 is matched with AB glue to form a high-strength side limit, and the carbon fiber cloth 3 at the part of the window 8 is cut off by scissors;
step 5: bonding the bottom of the test cartridge 1: placing the bottom of the test cylinder 1 into a groove on the transparent cover plate 2, bonding and fixing the test cylinder by using AB glue, and filling the groove with insulating glue;
step 6: placing the reserved pipe 13: placing the reserved pipe 13 into the test cylinder 1, and enabling the circle center of the reserved pipe 13 to be consistent with the circle center of the test cylinder 1;
step 7: manufacturing a pressure sensing positioning sheet 14: 502 glue is stuck on a PC long strip 12 with the width of 2cm and the length of 15cm, a round silica gel pad 10 with the same size is stuck on the stress head of a pressure sensing piece 5 by the 502 glue, then the PC round piece 11 with the diameter of 2cm is stuck on the head of the pressure sensing piece 5 by the 502 glue, and finally a big adhesive tape is wound and fixed to form a pressure sensing positioning piece 14;
step 8: placing the pressure sensing positioning sheet 14: horizontally arranging 1 pressure sensing positioning sheet 14 vertically every 10cm from the bottom of coral sand 4 and expanded concrete slurry 6, and arranging 4 pressure sensing positioning sheets in total; dividing the same cross section of a sample into five circle layers with the radius of 2.5cm, 5cm, 7.5cm, 10cm and 12.5cm on a horizontal plane of 30cm, and respectively arranging 5 pressure sensing positioning sheets 14 on each circle layer in the transverse direction and the longitudinal direction in two directions;
step 9: pouring the expanded concrete slurry 6: pouring the expanded concrete grout 6 with the well-prepared content of the expanding agent into the reserved pipe 13, and then slowly rotating and pulling out the reserved pipe 13;
step 10: three CT scans were performed on coral sand 4, which were: first scanning: just pouring concrete into the container, and when the concrete is in a liquid state; and (3) second scanning: after 3h, the concrete is initially set; and (3) third scanning: after 21 days, after the concrete is finally set;
step 11: the image and the stress change diagram of the coral sand 4 under the stress condition recorded by the camera and the computer and the deformation result of the coral sand 4 observed by the CT machine are used for quantitatively researching the mechanical response and the deformation condition of the coral sand 4 under the load action of different grades of force and different directions, and the crushing characteristic of the coral sand 4 under the stress condition is obtained by researching the corresponding relation between the compression settlement amount, the shape and the grain diameter of the coral sand 4 and the load value in the experimental process.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.

Claims (6)

1. The use method of the device for testing the extruding process of coral sand around the expansion pile by CT (computed tomography) is characterized in that: the device comprises a testing cylinder (1), wherein the testing cylinder (1) is of a hollow cylinder structure with openings on the upper surface and the lower surface; the upper surface and the lower surface of the test cylinder (1) are in contact fit with the transparent cover plate (2); the outer surface of the test cylinder (1) is wrapped with carbon fiber cloth (3); a reserved pipe (13) is arranged in the test cylinder (1), and the circle center of the reserved pipe (13) is the same as that of the test cylinder (1); coral sand (4) is filled in a gap between the reserved pipe (13) and the test cylinder (1), and the expansion concrete grout (6) is filled in the reserved pipe (13); a plurality of sensing positioning sheets (14) are uniformly arranged in the test cylinder (1) in the transverse direction and the longitudinal direction; the sensing positioning plate (14) is connected with an external terminal device (16), and the terminal device (16) comprises a computer and a CT machine;
the use method of the device for testing the extruding process of the coral sand around the expansion pile by CT comprises the following steps:
step 1: preparing materials: preparing a testing cylinder (1), a reserved pipe (13), a transparent cover plate (2), carbon fiber cloth (3), a pressure sensing sheet (5), a threaded rod (7), a window (8), a micro night vision camera (9), insulating glue, AB glue, a round silica gel pad (10), a large adhesive tape, a PC sheet, coral sand (4), expanded concrete grout (6), a computer and a CT machine;
step 2: cutting the test cylinder: cutting a test cylinder (1) with the diameter of 25cm and the height of 40cm, and then forming holes at intervals of 10cm on the wall of the tube from the bottom;
step 3: installing a window: the length of the window (8) is 7.5cm, the side length is 2.5cm, the length of the window is a pc material hollow transparent block, a micro night vision camera (9) is arranged every 2.5cm inside the window, the total number of the three cameras is three, and the head of the window (8) where the micro night vision camera (9) is placed is bonded with a hole opening on the wall of the testing cylinder (1) by AB glue;
step 4: wrapping with carbon fiber cloth: a test cylinder with the height of 40cm and the diameter of 25cm is used as a carrier, carbon fiber cloth (3) is matched with AB glue to form a high-strength side limit, and the carbon fiber cloth at the part of the window (8) is cut off by scissors;
step 5: bonding the bottom of the test cylinder: placing the bottom of the test cylinder (1) into a groove on the transparent cover plate (2), bonding and fixing the test cylinder by using AB glue, and filling the groove with insulating glue;
step 6: placing a reserved pipe: placing the reserved pipe (13) into the test cylinder (1) to enable the circle center of the reserved pipe (13) to be consistent with the circle center of the test cylinder (1);
step 7: manufacturing a sensing positioning sheet: 502 glue is stuck on a PC long strip sheet (12) with the width of 2cm and the length of 15cm, a round silica gel pad (10) with the same size is stuck on the stress head part of the pressure sensing sheet (5) by the 502 glue, a PC wafer (11) with the diameter of 2cm is stuck on the head part of the pressure sensing sheet (5) by the 502 glue, and finally a sensing positioning sheet (14) is formed by winding and fixing a large adhesive tape;
step 8: placing a sensing positioning sheet: horizontally arranging 1 sensing positioning sheet (14) vertically every 10cm from the bottom of coral sand (4) and expanded concrete slurry (6), and arranging 4 in total; dividing the same cross section of a sample into five circle layers with the radiuses of 2.5cm, 5cm, 7.5cm, 10cm and 12.5cm on a horizontal plane of 30cm, and respectively arranging 5 sensing positioning sheets (14) on each circle layer in the transverse direction and the longitudinal direction in two directions;
step 9: pouring the expanded concrete slurry: pouring the expanded concrete grout (6) with the well-prepared content of the expanding agent into the reserved pipe (13), and then slowly rotating and pulling out the reserved pipe (13);
step 10: three CT scans of the coral sand (4) were performed, respectively: first scanning: just pouring concrete into the container, and when the concrete is in a liquid state; and (3) second scanning: after 3h, the concrete is initially set; and (3) third scanning: after 21 days, after the concrete is finally set;
step 11: the coral sand (4) deformation characteristic under the stress condition is obtained by changing an image and a stress change diagram under the stress condition of the coral sand (4) recorded by a camera and a computer and observing a deformation result of the coral sand (4) by a CT (computed tomography) machine, quantitatively researching the mechanical response and the deformation condition of the coral sand (4) under the load action of different grades and forces in different directions, and researching the corresponding relation between the compression settlement amount, the shape, the particle size and the load value of the coral sand (4) in the experimental process.
2. The use method of the device for CT testing the coral sand extrusion process around the expansion pile as claimed in claim 1, wherein: the pipe wall of the test tube (1) is provided with a plurality of holes at equal intervals along the vertical direction, and the tops of the holes are provided with grooves.
3. The use method of the device for CT testing the coral sand extrusion process around the expansion pile as claimed in claim 1, wherein: a circular groove is formed in the surface of the cover plate (2), a slotted hole is formed in the groove, and the test cylinder (1) is matched with the groove; threaded holes are formed in four corners of the cover plate (2), and the two cover plates (2) on the upper bottom surface and the lower bottom surface are connected with nuts (15) through threaded rods (7).
4. The use method of the device for CT testing the coral sand extrusion process around the expansion pile as claimed in claim 1, wherein: the sensing positioning sheet (14) comprises a PC strip sheet (12), a pressure sensing sheet (5) is arranged on the surface of the PC strip sheet (12), and a PC wafer (11) is arranged at the head of the pressure sensing sheet (5); a round silica gel pad (10) is arranged between the PC round piece (11) and the head of the pressure sensing piece (5).
5. The use method of the device for CT testing the coral sand extrusion process around the expansion pile as claimed in claim 2, wherein: a window (8) is arranged in a hole on the pipe wall of the test cylinder (1); the window (8) is a hollow transparent block-shaped structure made of PC materials, a plurality of micro night vision cameras (9) are arranged in the window (8) at equal intervals, and connecting wires of the micro night vision cameras (9) extend out of grooves in the tops of holes in the pipe wall of the testing cylinder (1) and are connected with a computer.
6. The use method of the device for CT testing the coral sand extrusion process around the expansion pile as claimed in claim 5, wherein: the head of the window (8) is arc-shaped and is matched with the arc surface of the reserved hole of the test cylinder (1).
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* Cited by examiner, † Cited by third party
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3720248A1 (en) * 1987-06-19 1989-01-05 Schenck Ag Carl METHOD AND ARRANGEMENT FOR MEASURING DEFORMATION ON SAMPLES OR TEST BODIES IN TESTING MACHINES
CN106884441A (en) * 2017-04-11 2017-06-23 青岛理工大学 The open double-walled model pile tube experimental rig of one kind visualization
CN107462492A (en) * 2017-07-17 2017-12-12 三峡大学 The anchor rod anchored research method of large dosage swelling agent is carried out for CT scan technology
CN108169260A (en) * 2017-12-28 2018-06-15 三峡大学 With the method for CT scan analysis different content swelling agent anchoring body mechanism of intumescence
CN108398331A (en) * 2018-02-23 2018-08-14 山东大学 A kind of rock multiple information acquisition system and test method
CN110231115A (en) * 2019-06-20 2019-09-13 三峡大学 Simulate the device and method of plastic zone of surrounding rock development and liquid liner structure mechanical response under different supporting power
CN110534008A (en) * 2019-08-21 2019-12-03 三峡大学 The visualization device and method of the compacted process of coral sand densification in a kind of simulation sea reclamation

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3720248A1 (en) * 1987-06-19 1989-01-05 Schenck Ag Carl METHOD AND ARRANGEMENT FOR MEASURING DEFORMATION ON SAMPLES OR TEST BODIES IN TESTING MACHINES
CN106884441A (en) * 2017-04-11 2017-06-23 青岛理工大学 The open double-walled model pile tube experimental rig of one kind visualization
CN107462492A (en) * 2017-07-17 2017-12-12 三峡大学 The anchor rod anchored research method of large dosage swelling agent is carried out for CT scan technology
CN108169260A (en) * 2017-12-28 2018-06-15 三峡大学 With the method for CT scan analysis different content swelling agent anchoring body mechanism of intumescence
CN108398331A (en) * 2018-02-23 2018-08-14 山东大学 A kind of rock multiple information acquisition system and test method
CN110231115A (en) * 2019-06-20 2019-09-13 三峡大学 Simulate the device and method of plastic zone of surrounding rock development and liquid liner structure mechanical response under different supporting power
CN110534008A (en) * 2019-08-21 2019-12-03 三峡大学 The visualization device and method of the compacted process of coral sand densification in a kind of simulation sea reclamation

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