CN111474052A - Visual test device and method for pile-surrounding coral sand crushing in pile sinking process - Google Patents
Visual test device and method for pile-surrounding coral sand crushing in pile sinking process Download PDFInfo
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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
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- G—PHYSICS
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- 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
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Abstract
The invention provides a visual test device and a visual test method for pile-surrounding coral sand crushing in a pile sinking process, which comprises a cuboid test box, wherein a top cover is fixed at the top of the cuboid test box, two paired side walls of the cuboid test box are movable plates, a jack for applying pressure to the movable plates is arranged on the outer sides of the movable plates, a window is arranged on the side wall of each movable plate, and cameras for recording the test process are respectively arranged at different heights of the window and a precast pile; during the experiment, the inside precast pile that is provided with of cuboid test box to the multilayer coral sand layer has been laid in the inside packing of cuboid test box, and has arranged the pressure sensing piece according to horizontal, radial two different directions equidistance on the coplanar on coral sand layer.
Description
Technical Field
The invention relates to the technical field of pile-periphery coral sand crushing tests in a pile sinking construction process, and mainly relates to a pile-periphery coral sand crushing visual test device and method in a pile sinking process.
Background
With the needs of national defense construction and the development and utilization of resources such as marine oil gas, fishery, tourism and the like, the number of coral island reef construction projects is increased day by day, the scale is enlarged day by day, and the requirement of piling in coral sand is increased more and more. Pile sinking, as a method for strengthening a foundation with wide applicability on land, faces great difficulty in island construction. The coral reef foundation mainly comprises coral sand, reef limestone, calcareous soil and coral clastic soil, wherein the coral sand (also called calcareous sand) has the characteristics of loose particles, high porosity, large apparent friction angle, easiness in crushing, strong discreteness of geotechnical properties and the like, so that the engineering mechanical properties of the coral reef foundation are obviously different from those of general continental facies and marine facies sediments. Therefore, the method is particularly important for deeply researching and calculating the crushing and deformation of the coral sand in the piling process, and has great significance for the engineering design and construction of coral island reefs, the strengthening of national defense construction and the like.
Disclosure of Invention
Aiming at the problems of how to drive a stable foundation in sandstone and the like in the existing engineering, the device and the method for visually testing the breakage of coral sand around the pile in the pile driving process with adjustable lateral rigidity are provided. The method has great significance for drilling stable foundations in gravels and on corals, engineering design and construction of coral island reefs, strengthening national defense construction and the like.
In order to achieve the technical features, the invention is realized as follows: a visual test device for crushing coral sand around a pile in a pile sinking process comprises three different structural forms, wherein the first structural form comprises a cuboid test box, a top cover is fixed at the top of the cuboid test box, two paired side walls of the cuboid test box are movable plates, a jack for applying pressure to the movable plates is arranged on the outer sides of the movable plates, windows are arranged on the side walls of the movable plates, and cameras for recording the test process are respectively arranged at different heights of the windows and a precast pile; during the experiment, the inside precast pile that is provided with of cuboid test box to the multilayer coral sand layer has been laid in the inside packing of cuboid test box, and has arranged the pressure sensing piece according to horizontal, radial two different directions equidistance on the coplanar on coral sand layer.
The movable plate is matched with a sliding groove in the cuboid test box.
The movable plate is characterized in that a filling pad is fixedly mounted on the inner side wall of the movable plate and formed by wrapping transparent sand-water mixture with a transparent polyethylene material.
The coral sand layer is multi-layer, and is filled in the cuboid test box by adopting a layer paving mode, and each layer of coral sand layer adopts different colors.
The top cover is fixedly installed at the top of the cuboid test box by adopting double faced adhesive tape, and a central hole for penetrating the precast pile is reserved in the central part of the top cover.
The second structural style includes hollow cylinder, install on hollow cylinder's the inner wall and fill up the pad, hollow cylinder's top fixed mounting has the top cap, hollow cylinder's inside is provided with the precast pile, is provided with the window that a plurality of equidistant arrange on hollow cylinder's lateral wall, hollow cylinder's inside is filled with the coral sand layer of the different colours of multilayer through the layer shop, according to horizontal, radial two different directions equidistant arrangement of pressure sensing piece on the coplanar on coral sand layer, equidistant a plurality of cameras that are provided with on window and the precast pile.
The third kind of structural style includes fan-shaped cylinder bucket, the top fixed mounting of fan-shaped cylinder bucket has complex top cap with it, the inside of fan-shaped cylinder bucket is provided with cuts into sectorial precast pile, the inside of fan-shaped cylinder bucket is filled with the coral sand layer of the different colours of multilayer through the layer shop, according to horizontal, two radial different directions equidistant pressure sensing piece of having arranged on the coplanar on coral sand layer.
The test method of the visual test device for the pile-surrounding coral sand crushing in the pile sinking process comprises the following steps:
step1.1: preparing materials: preparing a cuboid test box which is made of a PC material, has no cover, is provided with a sliding chute and has two opposite surfaces capable of sliding, a filling pad formed by wrapping a transparent sand-water mixture by a transparent polyethylene material, a top cover with a central hole, a camera, a precast pile, a jack, a window, a dyed coral sand layer and a pressure sensing piece;
step1.2: firstly, installing windows on a movable surface at equal intervals; then mounting the filling pads on two movable plates which can slide on a cuboid test box without a cover; the dyed coral sand layer is layered and placed into a cuboid test box according to different colors, and then the pressure sensing pieces are arranged on the same plane in the dyed coral sand layer at equal intervals in two different directions, namely the transverse direction and the radial direction; finally, adhering the top cover with the central hole to a cuboid test box by using AB glue, and mounting a jack outside the two movable plates to obtain a first structural form;
step1.3: the method comprises the following steps that cameras are installed at different heights of a precast pile, the precast pile is slowly sunk into a cuboid test box at a constant speed through a center hole of a top cover, the camera records the crushing, extruding and moving conditions of coral sand in the pile sinking process in real time, and a pressure sensing piece records the annular and radial pressure change conditions of the coral sand in real time;
step1.4: adjusting the jack to enable the two movable plates to move towards the center of the cuboid test box, namely, changing the side limit pressure, and then performing the pile sinking test in Step1.3, wherein in the pile sinking process, the camera records the crushing, extrusion and movement conditions of coral sand in the pile sinking process in real time, and the pressure sensing piece records the annular and radial pressure change conditions of the coral sand in real time;
step1.5: and finally, analyzing the crushing condition of the coral sand around the pile in the pile sinking process according to the measured crushing compaction condition of the coral sand and the corresponding pressure change condition of the coral sand.
The test method of the visual test device for the pile-surrounding coral sand crushing in the pile sinking process comprises the following steps:
step2.1: preparing materials: preparing a hollow cylinder without a cover made of a PC material, a filling pad formed by wrapping a transparent sand-water mixture by a transparent polyethylene material, a cylinder top cover with a central hole made of a PC board with a hole, a camera, a precast pile, a window, a colored coral sand layer and a pressure sensing piece;
step2.2: the windows are installed at equal intervals, and the filling pads are installed on the inner wall of the hollow cylinder; then, the dyed coral sand layer is layered and placed into a hollow cylinder according to different colors, pressure sensing pieces are arranged on the same plane in the dyed coral sand layer at equal intervals in two different directions, namely the circumferential direction and the radial direction, and finally, a cylinder top cover with holes is fixed on the cylinder by AB glue and is firmly adhered to obtain a second structural form;
step2.3: the method comprises the following steps that cameras are installed at different heights of a precast pile, the precast pile is slowly sunk into a hollow cylinder at a constant speed through a hole in a top cover, the camera records the crushing, extrusion and movement conditions of coral sand in the pile sinking process in real time, and pressure sensing pieces record the annular and radial pressure change conditions of the coral sand in real time;
step2.4: and finally, analyzing the crushing condition of the coral sand around the pile in the pile sinking process according to the measured crushing compaction condition of the coral sand and the corresponding pressure change condition of the coral sand.
The test method of the visual test device for the pile-surrounding coral sand crushing in the pile sinking process comprises the following steps:
step3.1: preparing materials: preparing a fan-shaped cylindrical barrel made of a PC plate cut at a certain angle, a cylindrical top cover with a center hole, a camera, a fan-shaped precast pile, a window, a dyed coral sand layer and a pressure sensing piece, wherein the top cover is cut at a certain angle;
step3.2: firstly, placing a dyed coral sand layer into a cut fan-shaped cylindrical barrel in a layered manner according to different colors, arranging pressure sensing pieces on the same plane in the dyed coral sand layer at equal intervals in two different directions, namely the circumferential direction and the radial direction, fixing a cylindrical top cover which is provided with holes and cut at a certain angle onto the cut fan-shaped cylindrical barrel by using AB glue, and firmly gluing to obtain a third structural form;
step3.3: the prefabricated fan-shaped pile cut into a certain angle slowly sinks into the fan-shaped cylindrical barrel at a constant speed through the hole of the cut top cover, the crushing, extrusion and movement conditions of coral sand in the pile sinking process can be observed and recorded in real time through the two cut surfaces, and the PC board is transparent, so that direct observation can be carried out by naked eyes without a camera; meanwhile, the pressure sensing piece records the circumferential and radial pressure change conditions of the coral sand in real time;
step3.4: and finally, analyzing the crushing condition of the coral sand around the pile in the pile sinking process according to the measured crushing compaction condition of the coral sand and the corresponding pressure change condition of the coral sand.
The invention has the following beneficial effects:
1. different confining pressures can be applied to two sliding surfaces of the cuboid test box through the jack, and the crushing and displacement conditions of coral sand in the pile sinking process under different confining pressures are observed.
2. Transparent and high-strength precast pile through the PC material preparation carries out pile sinking test, can extrude crushing coral sand at the pile driving in-process, and self is not destroyed, can also utilize the transparency of PC material to utilize the camera to observe whole pile driving process.
3. The condition of the whole deformation of coral sand granule of the different degree of depth of observation that can understand through the camera on the transparent precast pile and record pile driver in-process pile week department also can observe the displacement condition of coral sand granule self broken condition record coral sand granule, can observe its big deformation, also can measure its accurate deformation.
4. Through densely distributing the pressure sensing pieces at a plurality of positions of different devices, the stress conditions of coral sand at different depths and different positions can be accurately measured, and then a visual image is established and detailed data analysis is carried out.
5. Through the coral sand of different colours, can more clear observation the displacement and the broken condition of the coral sand of different aspect in the pile driving process.
6. The PC cylinder bucket of certain angle of vertical cutting can be directly through the clear crushing and the displacement condition of observing the whole side of coral sand in the pile driving process of observing of cutting plane, need not install camera and window in addition.
7. The deformation of the internal filling pad caused by the squeezing of the coral sand on the internal filling pad can be clearly observed through the transparent filling pad during the piling process.
8. Through the real-time observation and accurate recording of the camera and the pressure sensing piece, the accuracy of the test is ensured.
9. The camera in the window can accurately observe and record the conditions of compact compaction, breakage, displacement and the like of coral sand around the window.
10. The three tests can better simulate the foundation piling process in coral sand, and each device has the advantages of simple structure, visual process, high testing precision and low testing cost.
Drawings
The invention is further illustrated by the following figures and examples.
Fig. 1 is a schematic view of a first embodiment of the present invention.
Fig. 2 is a schematic view of a first embodiment of the present invention.
Fig. 3 is a schematic view of a first embodiment of the present invention.
FIG. 4 is a schematic view showing the arrangement of the colored coral sand layer of the present invention.
Fig. 5 is a schematic diagram of a bottom pressure sensing tile arrangement of the present invention.
In the figure: precast pile 1, camera 2, cuboid test box 3, top cap 4, fill and fill up 5, jack 6, window 7, coral sand layer 8, pressure sensing piece 9, fan-shaped cylinder bucket 11, spout 12.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1-5, a visual test device for pile-surrounding coral sand crushing in a pile sinking process comprises three different structural forms, wherein the first structural form comprises a cuboid test box 3, a top cover 4 is fixed at the top of the cuboid test box 3, two paired side walls of the cuboid test box 3 are movable plates, jacks 6 for applying pressure to the movable plates are arranged on the outer sides of the movable plates, windows 7 are arranged on the side walls of the movable plates, and cameras 2 for recording the test process are respectively arranged at different heights of the windows 7 and the precast piles 1; during the experiment, cuboid test box 3 is inside to be provided with precast pile 1 to the multilayer coral sand layer 8 has been laid in the inside packing of cuboid test box 3, and has arranged pressure sensing piece 9 according to horizontal, radial two different directions equidistance on the coplanar of coral sand layer 8.
Further, the movable plate is matched with a sliding groove 12 on the cuboid test box 3.
Further, a filling pad 5 is fixedly mounted on the inner side wall of the movable plate, and the filling pad 5 is formed by wrapping transparent sand-water mixture with a transparent polyethylene material.
Further, coral sand layer 8 has a plurality of layers, and is filled in cuboid test box 3 by layer paving, and each layer of coral sand layer 8 has different colors.
Further, the top cover 4 is fixedly installed at the top of the cuboid test box 3 by adopting a double faced adhesive tape, and a central hole for penetrating through the precast pile 1 is reserved at the central part of the top cover 4.
Example 2:
the second structural style includes hollow cylinder 10, install on hollow cylinder 10's the inner wall and fill up 5, hollow cylinder 10's top fixed mounting has top cap 4, hollow cylinder 10's inside is provided with precast pile 1, is provided with a plurality of equidistant window 7 of arranging on hollow cylinder 10's lateral wall, hollow cylinder 10's inside is filled with the coral sand layer 8 of the different colours of multilayer through layer shop packing, pressure sensing piece 9 has been arranged according to horizontal, two radial different directions equidistant on the coplanar of coral sand layer 8, equidistant a plurality of cameras 2 that are provided with on window 7 and the precast pile 1.
Example 3:
the third kind of structural style includes fan-shaped cylinder bucket 11, fan-shaped cylinder bucket 11's top fixed mounting has complex top cap 4 with it, fan-shaped cylinder bucket 11's inside is provided with cuts into fan-shaped precast pile 1, fan-shaped cylinder bucket 11's inside is filled with the coral sand layer 8 of the different colours of multilayer through the layer shop fill, pressure sensing piece 9 has been arranged according to horizontal, two radial different directions equidistant on the coplanar of coral sand layer 8.
Example 4:
the test method of the visual test device for the pile-surrounding coral sand crushing in the pile sinking process comprises the following steps:
step1.1: preparing materials: preparing a cuboid test box 3 which is made of a PC material, has no cover, is provided with a sliding chute and has two opposite surfaces capable of sliding, a filling pad 5 formed by wrapping a transparent sand-water mixture by a transparent polyethylene material, a top cover 4 with a central hole, a camera 2, a precast pile 1, a jack 6, a window 7, a dyed coral sand layer 8 and a pressure sensing piece 9;
step1.2: the windows 7 are arranged on a movable surface at equal intervals; then the filling pad 5 is arranged on two movable plates which can slide on the cuboid test box 3 without a cover; the dyed coral sand layer 8 is layered and placed into the cuboid test box 3 according to different colors, and the pressure sensing pieces 9 are arranged on the same plane in the dyed coral sand layer 8 at equal intervals in two different directions, namely the transverse direction and the radial direction; finally, adhering the top cover 4 with the central hole to the cuboid test box 3 by using AB glue, and installing jacks 6 outside the two movable plates to obtain a first structural form;
step1.3: installing cameras 2 at different heights of a precast pile 1, slowly and uniformly sinking the pile precast pile 1 into a cuboid test box 3 through a center hole of a top cover 4, recording the crushing, extruding and moving conditions of coral sand in the pile sinking process in real time by the cameras 2, and recording the annular and radial pressure change conditions of the coral sand in real time by pressure sensing pieces;
step1.4: adjusting the jack 6 to enable the two movable plates to move towards the center of the cuboid test box 3, namely, the side limit pressure is changed, then, the pile sinking test in Step1.3 is carried out, in the pile sinking process, the crushing, extrusion and movement conditions of coral sand in the pile sinking process are recorded in real time by a camera, and the circumferential and radial pressure change conditions of the coral sand are recorded in real time by a pressure sensing piece;
step1.5: and finally, analyzing the crushing condition of the coral sand around the pile in the pile sinking process according to the measured crushing compaction condition of the coral sand and the corresponding pressure change condition of the coral sand.
Example 5:
the test method of the visual test device for the pile-surrounding coral sand crushing in the pile sinking process comprises the following steps:
step2.1: preparing materials: preparing a hollow cylinder 10 which is made of a PC material and is not provided with a cover, a filling pad 5 which is formed by wrapping a transparent sand-water mixture by a transparent polyethylene material, a cylinder top cover 4 which is made of a PC board with holes and is provided with a central hole, a camera 2, a precast pile 1, a window 7, a dyed coral sand layer 8 and a pressure sensing piece 9;
step2.2: the windows 7 are installed at equal intervals, and the filling pads 5 are installed on the inner wall of the hollow cylinder 10; then, the dyed coral sand layer 8 is layered into the hollow cylinder 10 according to different colors, then the pressure sensing pieces 9 are arranged on the same plane in the dyed coral sand layer 8 at equal intervals in two different directions, namely the circumferential direction and the radial direction, finally, the cylinder top cover with holes is fixed on the cylinder 10 by AB glue, and a second structural form is obtained by firm bonding;
step2.3: installing cameras 2 at different heights of the precast pile 1, slowly and uniformly sinking the precast pile 1 into the hollow cylinder 10 through a hole of the top cover, recording the crushing, extrusion and movement conditions of coral sand in the pile sinking process in real time by the cameras, and recording the circumferential and radial pressure change conditions of the coral sand in real time by the pressure sensing piece;
step2.4: and finally, analyzing the crushing condition of the coral sand around the pile in the pile sinking process according to the measured crushing compaction condition of the coral sand and the corresponding pressure change condition of the coral sand.
Example 6:
the test method of the visual test device for the pile-surrounding coral sand crushing in the pile sinking process comprises the following steps:
step3.1: preparing materials: preparing a fan-shaped cylindrical barrel 11 made of a PC plate cut at a certain angle, a cylindrical top cover 4 with a central hole, a camera 2, a fan-shaped precast pile 1, a window 7, a dyed coral sand layer 8 and a pressure sensing piece 9, wherein the top cover 4 is cut at a certain angle;
step3.2: firstly, placing a dyed coral sand layer 8 into a cut fan-shaped cylindrical barrel 11 in a layered mode according to different colors, then arranging pressure sensing pieces 9 on the same plane in the dyed coral sand layer 8 at equal intervals in two different directions in the circumferential direction and the radial direction, and finally fixing a cylindrical top cover which is provided with holes and cut at a certain angle onto the cut fan-shaped cylindrical barrel 11 by using AB glue, and firmly adhering to obtain a third structural form;
step3.3: the fan-shaped precast pile 1 cut into a certain angle slowly sinks into the fan-shaped cylindrical barrel 11 at a constant speed through the hole of the cut top cover, the crushing, extrusion and movement conditions of coral sand in the pile sinking process can be observed and recorded in real time through two cut surfaces, and the PC board is transparent, so that the direct observation can be carried out by naked eyes without a camera; meanwhile, the pressure sensing piece records the circumferential and radial pressure change conditions of the coral sand in real time;
step3.4: and finally, analyzing the crushing condition of the coral sand around the pile in the pile sinking process according to the measured crushing compaction condition of the coral sand and the corresponding pressure change condition of the coral sand.
Claims (10)
1. The utility model provides a visual test device of pile week coral sand breakage of pile sinking in-process which characterized in that: the testing device comprises three different structural forms, wherein the first structural form comprises a cuboid testing box (3), a top cover (4) is fixed at the top of the cuboid testing box (3), two paired side walls of the cuboid testing box (3) are movable plates, a jack (6) for applying pressure to the movable plates is arranged on the outer sides of the movable plates, a window (7) is installed on the side walls of the movable plates, and cameras (2) for recording the testing process are respectively arranged at different heights of the window (7) and the precast pile (1); during the experiment, cuboid test box (3) inside is provided with precast pile (1) to inside packing at cuboid test box (3) has laid multilayer coral sand layer (8), and has arranged pressure sensing piece (9) according to horizontal, radial two different directions equidistance on the coplanar of coral sand layer (8).
2. The visual test device for the peripile coral sand breakage in the pile sinking process as claimed in claim 1, wherein: the movable plate is matched with a sliding groove (12) on the cuboid test box (3).
3. The visual test device for the peripile coral sand breakage in the pile sinking process as claimed in claim 1, wherein: the novel portable sand-water separator is characterized in that a filling pad (5) is fixedly mounted on the inner side wall of the movable plate, and the filling pad (5) is formed by wrapping transparent sand-water mixture with transparent polyethylene material.
4. The visual test device for the peripile coral sand breakage in the pile sinking process as claimed in claim 1, wherein: the coral sand layer (8) is multi-layer, and is filled in the cuboid test box (3) in a layer paving mode, and each layer of coral sand layer (8) adopts different colors.
5. The visual test device for the peripile coral sand breakage in the pile sinking process as claimed in claim 1, wherein: the top cover (4) is fixedly installed at the top of the cuboid test box (3) by adopting a double faced adhesive tape, and a central hole for penetrating through the precast pile (1) is reserved at the central part of the top cover (4).
6. The visual test device for the peripile coral sand breakage in the pile sinking process as claimed in claim 1, wherein: the second structural style includes hollow cylinder (10), install filling pad (5) on the inner wall of hollow cylinder (10), the top fixed mounting of hollow cylinder (10) has top cap (4), the inside of hollow cylinder (10) is provided with precast pile (1), is provided with window (7) that a plurality of equidistant arrangements on the lateral wall of hollow cylinder (10), the inside of hollow cylinder (10) is filled with coral sand layer (8) of the different colours of multilayer through the layer shop packing, pressure sensing piece (9) have been arranged according to horizontal, the equidistant direction of two radial differences on the coplanar of coral sand layer (8), window (7) and precast pile (1) equidistant are provided with a plurality of cameras (2).
7. The visual test device for the peripile coral sand breakage in the pile sinking process as claimed in claim 1, wherein: the third kind structural style includes fan-shaped cylinder bucket (11), the top fixed mounting of fan-shaped cylinder bucket (11) has complex top cap (4) with it, the inside of fan-shaped cylinder bucket (11) is provided with cuts into fan-shaped precast pile (1), the inside of fan-shaped cylinder bucket (11) is filled with coral sand layer (8) of the different colours of multilayer through the layer shop, pressure sensing piece (9) have been arranged according to horizontal, two radial different directions equidistant on the coplanar of coral sand layer (8).
8. A test method of the visual test device for peripile coral sand crushing in the pile sinking process, which is adopted by any one of claims 1 to 5, is characterized by comprising the following steps:
step1.1: preparing materials: preparing a cuboid test box (3) which is made of a PC material, has no cover, is provided with a sliding chute and can slide on two opposite surfaces, a filling pad (5) formed by wrapping a transparent sand-water mixture by a transparent polyethylene material, a top cover (4) with a central hole, a camera (2), a precast pile (1), a jack (6), a window (7), a dyed coral sand layer (8) and a pressure sensing piece (9);
step1.2: the windows (7) are arranged on a movable surface at equal intervals; then the filling pad (5) is arranged on two movable plates which can slide on a cuboid test box (3) without a cover; the dyed coral sand layer (8) is layered into a cuboid test box (3) according to different colors, and then the pressure sensing pieces (9) are arranged on the same plane in the dyed coral sand layer (8) at equal intervals in two different directions in the transverse direction and the radial direction; finally, adhering the top cover (4) with the central hole to the cuboid test box (3) by using AB glue, and installing a jack (6) outside the two movable plates to obtain a first structural form;
step1.3: the method comprises the following steps that cameras (2) are installed at different heights of a precast pile (1), the pile precast pile (1) is slowly sunk into a cuboid test box (3) at a constant speed through a center hole of a top cover (4), the crushing, extrusion and movement conditions of coral sand in the pile sinking process are recorded in real time through the cameras (2), and the circumferential and radial pressure change conditions of the coral sand are recorded in real time through pressure sensing pieces;
step1.4: adjusting a jack (6) to enable the two movable plates to move towards the center of the cuboid test box (3), namely, side limit pressure is changed, then a pile sinking test in Step1.3 is carried out, in the pile sinking process, a camera records the crushing, extrusion and movement conditions of coral sand in the pile sinking process in real time, and a pressure sensing piece records the annular and radial pressure change conditions of the coral sand in real time;
step1.5: and finally, analyzing the crushing condition of the coral sand around the pile in the pile sinking process according to the measured crushing compaction condition of the coral sand and the corresponding pressure change condition of the coral sand.
9. A test method of the visual test device for peripilular coral sand crushing in the pile sinking process, which is characterized by comprising the following steps:
step2.1: preparing materials: preparing a hollow cylinder (10) which is made of a PC material and is not provided with a cover, a filling pad (5) which is formed by wrapping a transparent sand-water mixture by a transparent polyethylene material, a cylinder top cover (4) which is made of a PC plate with holes and is provided with a central hole, a camera (2), a precast pile (1), a window (7), a dyed coral sand layer (8) and a pressure sensing piece (9);
step2.2: the windows (7) are installed at equal intervals, and the filling pad (5) is installed on the inner wall of the hollow cylinder (10); then, the dyed coral sand layer (8) is layered into a hollow cylinder (10) according to different colors, then pressure sensing pieces (9) are arranged on the same plane in the dyed coral sand layer (8) at equal intervals in two different directions, namely the circumferential direction and the radial direction, and finally, a cylinder top cover with holes is fixed on the cylinder (10) by AB glue and is firmly adhered to obtain a second structural form;
step2.3: the method comprises the following steps that cameras (2) are installed at different heights of a precast pile (1), the precast pile (1) is slowly sunk into a hollow cylinder (10) through a hole in a top cover at a constant speed, the crushing, extrusion and movement conditions of coral sand in the pile sinking process are recorded in real time by the cameras, and the circumferential and radial pressure change conditions of the coral sand are recorded in real time by pressure sensing pieces;
step2.4: and finally, analyzing the crushing condition of the coral sand around the pile in the pile sinking process according to the measured crushing compaction condition of the coral sand and the corresponding pressure change condition of the coral sand.
10. A test method adopting the peripilular coral sand crushing visualization test device in the pile sinking process as claimed in claim 9, which is characterized by comprising the following steps:
step3.1: preparing materials: preparing a fan-shaped cylindrical barrel (11) made of a PC plate cut at a certain angle, a cylindrical top cover (4) with a central hole, a camera (2), a fan-shaped precast pile (1), a window (7), a dyed coral sand layer (8) and a pressure sensing piece (9) which are cut at a certain angle;
step3.2: firstly, placing a dyed coral sand layer (8) into a cut fan-shaped cylindrical barrel (11) layer by layer according to different colors, then arranging pressure sensing pieces (9) on the same plane in the dyed coral sand layer (8) at equal intervals in two different directions in the circumferential direction and the radial direction, and finally fixing a cylindrical top cover which is provided with holes and cut according to a certain angle on the cut fan-shaped cylindrical barrel (11) by using AB glue, and firmly gluing to obtain a third structural form;
step3.3: the prefabricated fan-shaped pile (1) cut into a certain angle slowly sinks into the fan-shaped cylindrical barrel (11) at a constant speed through the hole of the cut top cover, the crushing, extrusion and movement conditions of coral sand in the pile sinking process can be observed and recorded in real time through the two cut surfaces, and the PC board is transparent, so that the direct observation can be carried out by naked eyes without a camera; meanwhile, the pressure sensing piece records the circumferential and radial pressure change conditions of the coral sand in real time;
step3.4: and finally, analyzing the crushing condition of the coral sand around the pile in the pile sinking process according to the measured crushing compaction condition of the coral sand and the corresponding pressure change condition of the coral sand.
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