CN108221844B - Dynamic response test device for near-sea foundation pit under effect of simulated tidal load - Google Patents
Dynamic response test device for near-sea foundation pit under effect of simulated tidal load Download PDFInfo
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- CN108221844B CN108221844B CN201711496123.9A CN201711496123A CN108221844B CN 108221844 B CN108221844 B CN 108221844B CN 201711496123 A CN201711496123 A CN 201711496123A CN 108221844 B CN108221844 B CN 108221844B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B1/00—Equipment or apparatus for, or methods of, general hydraulic engineering, e.g. protection of constructions against ice-strains
- E02B1/02—Hydraulic models
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
Abstract
The invention discloses a dynamic response test device for a coastal foundation pit under the action of a simulated tidal load, which comprises a water level constant system, a crank sliding rod system, a transmission system, a measuring system and a model box. The water level constant system comprises a constant water level water tank, a valve, a lining plate A and the like. The crank sliding rod system comprises a vertical rod, a lining plate B, a slide chamber, a curved rod and the like. The mold box comprises a mold box frame, a retaining wall, a breakwater and the like. The measuring system comprises a miniature soil pressure box and a pore pressure sensor. A miniature soil pressure box is embedded in the soil retaining wall; the breakwater is arranged on the active side of the foundation pit; the sensor fixing bracket is arranged at the bottom of the model box. The device can simulate the response of the active and passive lateral soil pressure and the pore water pressure of the foundation pit under the action of different foundation pit widths, retaining wall soil penetration depth, the distance from the breakwater to the retaining wall and different tide factors. The invention can provide effective test data support for the research of the dynamic response problem of the coastal foundation pit under the action of tidal load and help theoretical analysis.
Description
Technical Field
The invention relates to a test device for measuring soil pressure and pore water pressure in ocean foundation pit engineering, in particular to a tidal element variation model test device for responding to active and passive lateral soil pressure and pore water pressure of a near-sea foundation pit, which can be used for measuring active and passive lateral soil pressure values and pore water pressure values of the near-sea foundation pit under different foundation pit excavation widths, different foundation pit excavation depths, different retaining wall soil penetration depths, different retaining walls and different retaining wall and breakwater distances.
Background
Along with the development of coastal cities, more and more high-rise buildings, underground space development projects, cross-sea tunnels, cross-sea bridges and other heavy projects are put into construction, and accordingly, development and construction of a large number of coastal deep foundation pits are carried out. It is known that the water level of the ocean undergoes cyclic and reciprocating changes in a period of (half) days or (half) months. The existing design only considers the effect of the highest water level, and does not consider the influence of the cyclic variation of the water level. Therefore, the conventional design is not determined whether the design is safe or dangerous.
Disclosure of Invention
In order to overcome the defects of the existing coastal foundation pit design, the invention provides a dynamic response test device for the coastal foundation pit under the action of simulating tidal load, which realizes the research on the water-soil pressure response and the law of the active and passive sides of the coastal foundation pit by controlling the excavation widths of different foundation pits, the excavation depths of different foundation pits, the soil penetration depths of different retaining walls and the distances between different retaining walls and breakwater under the action of different tidal elements.
The technical scheme adopted by the invention for solving the technical problems is as follows: a dynamic response test device for a near-sea foundation pit under the action of a simulated tidal load comprises a water level constant system, a crank slide bar system, a transmission system, a measuring system and a model box; the water level constant system comprises a constant water level water tank, a water inlet pipe valve, a water inlet pipe, a water outlet pipe valve, a water outlet pipe, a communicating pipe valve, a communicating pipe and a lining plate A; the crank sliding rod system comprises a vertical rod, a lining plate B, a slide chamber, two curved rods and two circular rings; the transmission system comprises a speed reducer, a motor and a plug; the top of the first side surface of the constant water level water tank is provided with a hole for installing a water inlet pipe valve; the water inlet pipe valve is connected with a water source through a water inlet pipe; the center of the second side surface of the constant water level water tank is provided with a hole for mounting a water outlet pipe valve; the water outlet pipe valve is connected with one end of the water outlet pipe; the other end of the water outlet pipe is connected to a floor drain; the bottom of the third side surface of the constant water level water tank is provided with a hole for installing a communicating pipe valve; the communicating pipe valve is connected with one end of the communicating pipe, and the other end of the communicating pipe is connected with the water inlet and outlet valve; the lining plate A is fixed at the bottom of the constant water level water tank; the lining plate B is fixed at the top of the smoothbore; one end of the vertical rod is fixedly connected with the lining plate A, and the other end of the vertical rod is fixedly connected with the lining plate B; the slide chamber is in a cuboid shape, a strip-shaped through hole A is formed in the vertical plane corresponding to the long side, a through hole B is formed in the vertical plane corresponding to the short side, the through hole A and the through hole B are in the same horizontal plane and are perpendicular to each other, and the two circular rings respectively penetrate through the through holes B on the two sides and are placed at the designated positions of the through hole A; the crank rod is Z-shaped, one end of the crank rod is sleeved in the circular ring, the other end of the crank rod is connected with the speed reducer, the speed reducer is connected with the motor, and the motor is connected with the power supply through a plug;
the measuring system comprises a miniature soil pressure box and a pore pressure sensor; the model box consists of a model box frame, a model box bottom plate, a model box left side rotating plate, a model box right side plate, toughened glass, a retaining wall, a breakwater and a sensor fixing bracket; the model box frame is formed by welding iron bars; the bottom plate of the model box and the right side plate of the model box are both made of iron plates and are welded on the framework of the model box; the left rotating plate of the model box is made of an iron plate, and is connected with a rotor A on the left rotating plate of the model box and a rotor B on the frame of the model box through a rotor A on the left rotating plate of the model box, so that the purpose of free rotation is achieved; the bottom of the right side plate of the model box is provided with a small hole for installing a water outlet valve for accelerating soil consolidation, and the top of the model box is provided with a water inlet valve and a water outlet valve; the toughened glass is adhered to the model box frame through structural adhesive; the retaining wall comprises an aluminum alloy plate, the middle lower parts of two sides of the aluminum alloy plate are respectively riveted with a nylon plate A and a nylon plate B, the upper part of the aluminum alloy plate is fixed with angle steel with an L-shaped cross section, the retaining wall is placed at the top of the model box frame through the angle steel, and the retaining wall is connected with the left rotating plate of the model box through a rigid support; circular holes are drilled in the nylon plate A and the nylon plate B, and miniature soil pressure boxes are arranged in the circular holes; the cross section of the breakwater is in a right-angle trapezoid shape, the breakwater is made of organic glass plates through glass cement and placed on a seabed, and the seabed is formed by filling soil samples in a model box according to design requirements; the sensor fixing support is formed by welding a cylindrical long and thin iron rod to the center of a square thin iron plate in a spot welding mode and is placed at different positions on a bottom plate of the model box, a groove is formed in the sensor fixing support in a lathing mode, and a pore pressure sensor is arranged on the groove.
Furthermore, the cross section of the through hole B is in a shape of two semicircular sections, the middle of the through hole B is connected with a rectangle, and a circular ring can be just placed in the through hole B.
Furthermore, the bent rod is formed by mutually welding three cylindrical rods with circular cross sections; the diameter of the curved rod is consistent with the inner diameter of the circular ring.
Furthermore, the lining plate A is made of a metal plate, four threaded holes are drilled in the lining plate A, and the lining plate A is connected to the bottom of the constant water level water tank through screws; the lining plate B is made of an iron plate, four threaded holes are drilled in the lining plate B, and the lining plate B is connected with the slide chamber through screws.
Furthermore, the vertical rod is an iron rod, one end of the vertical rod is fully welded on the lining plate A, and the other end of the vertical rod is fully welded on the lining plate B.
Furthermore, the aluminum alloy plate is sequentially provided with 2 rows and 2 columns as a group from top to bottom, three groups of holes with the depth of one centimeter are used for inserting the rigid support, different groups of holes can be selected according to experimental requirements to simulate different soil penetration depths, the distance from the retaining wall to the rotating plate on the left side of the model box can also be adjusted, and different excavation widths of the foundation pit can be simulated.
Further, the breakwater can be placed on different positions of the seabed for researching the influence of different distances from the breakwater to the retaining wall.
Furthermore, array-type circular holes are drilled in the nylon plate A and the nylon plate B.
Furthermore, the thickness of the miniature soil pressure cell is consistent with that of the nylon plate A and that of the nylon plate B, and the miniature soil pressure cell signal transmission line is led out through the slots carved on the nylon plate A and the nylon plate B and is connected to the data acquisition instrument and the power supply device of the miniature soil pressure cell.
Furthermore, the curvature of the outer diameter of the hole pressure sensor is consistent with that of the groove on the sensor fixing support, and the hole pressure sensor is fixed on the sensor fixing support through a binding belt; and the pore pressure sensor signal transmission line is connected to the data acquisition instrument and the pore pressure sensor power supply device along the sequence of the sensor fixing bracket, the bottom plate of the model box and the toughened glass.
The invention has the beneficial effects that:
1. the invention can provide boundary water pressure with simple harmonic change and provide technical support for researching the influence of tidal load on engineering.
2. The invention can adjust the amplitude of tidal change by adjusting the length of the Z-shaped curved rod, and adjust the period of tidal change by adjusting the gear ratio of the speed reducer.
3. The reasonable foundation pit excavation parameters under unified external load (tidal action) can be researched by adjusting different soil penetration depths of the retaining wall, the distance between the retaining wall and the rotating plate on the left side of the model box and the distance between the retaining wall and the wave shield.
4. The retaining wall consists of aluminum alloy plates and nylon plates. The aluminum alloy plate provides main rigidity of the retaining wall, and meanwhile, the aluminum alloy plate is large in rigidity, so that the reduction of a test model is facilitated. The nylon plate is convenient to make holes, the price is low, different micro soil pressure cell embedding positions and groove lines can be designed according to different soil penetration depths of the retaining wall, and the experimental cost is reduced while the number of experimental groups is guaranteed by changing the nylon plate instead of an aluminum alloy plate.
5. The soil pressure cell is embedded in a nylon plate (the thickness of the soil pressure cell is consistent with the thickness of the soil pressure cell), meanwhile, a soil pressure cell signal transmission line is also embedded in a slot line on the back of the nylon plate, and then a nylon plastic plate is fixed on an aluminum alloy plate by screws. The surface of the retaining wall can be ensured to be flat, and the stress concentration phenomenon caused by uneven surface is avoided; and the absolute rigidity of the back of the soil pressure cell can be ensured.
6. According to the invention, a series of sensor fixing supports are arranged on the bottom plate of the model box, and pore pressure sensors with different numbers are arranged on the supports and used for measuring the water pressure value of the gap between the active side hole and the passive side hole of the foundation pit at any time, so that the equal water head line and the flow line in the seepage field are described, and the change rule of the equal water head line and the flow line is researched.
Drawings
FIG. 1 is an effect diagram of a dynamic response test device for a near-sea foundation pit under the action of a simulated tidal load;
FIG. 2 is a front view of the water level constancy system;
FIG. 3 is a top view of the water level constancy system;
FIG. 4 is an elevation view of a crank slide bar system;
FIG. 5 is a side view of a crank slide bar system;
FIG. 6 is a schematic view of a crank;
FIG. 7 is a schematic illustration of a transmission system;
FIG. 8 is a schematic view of a mold box;
FIG. 9 is a schematic view of a left rotating plate of the mold box;
FIG. 10 is a schematic view of a rotor;
FIG. 11 is a schematic view of a latch;
FIG. 12 is a schematic view of a right side plate of the mold box;
FIG. 13 is a schematic view of a retaining wall;
FIG. 14 is a retaining wall layout view;
FIG. 15 is a schematic illustration of a breakwater;
FIG. 16 is a schematic view of a sensor mounting bracket;
in the figure: a constant water level water tank 1; a water inlet pipe valve 2; a water inlet pipe 3; a water outlet pipe valve 4; a water outlet pipe 5; a communicating pipe valve 6; a communicating pipe 7; a liner plate A8; a vertical rod 9; a liner plate B10; a smoothbore 11; a curved lever 12; a through hole A13; a through hole B14; a circular ring 15; a speed reducer 16; a motor 17; a plug 18; a mold box frame 19; rotor B19-1; a bolt B19-2; a mold box bottom plate 20; a mold box left side rotating plate 21; a rotor A21-1; a bolt A21-2; mold box right side plate 22; a water outlet valve 22-1; a water inlet and outlet valve 22-2; tempered glass 23; a retaining wall 24; 24-1 parts of aluminum alloy plate; nylon plate A24-2; nylon plate B24-3; 24-4 parts of angle steel; a breakwater 25; a sensor fixing bracket 26; a miniature earth pressure cell 27; a pore pressure sensor 28; a rigid support 29.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples.
As shown in figure 1, the dynamic response test device for simulating the coastal foundation pit under the action of tidal load comprises a water level constant system, a crank slide rod system, a transmission system, a measurement system and a model box.
As shown in fig. 2 and 3, the water level constant system includes a constant water level water tank 1, a water inlet pipe valve 2, a water inlet pipe 3, a water outlet pipe valve 4, a water outlet pipe 5, a communicating pipe valve 6, a communicating pipe 7 and a lining plate A8. The constant water level water tank 1 is a topless water tank formed by bonding 5 square organic glass plates through AB glue; the top of the first side surface of the constant water level water tank 1 is provided with a hole for installing a water inlet pipe valve 2; the water inlet pipe valve 2 is connected with a water source through a water inlet pipe 3, and the water inlet speed can be controlled by adjusting the water inlet pipe valve 2; the center of the second side surface of the constant water level water tank 1 is provided with a hole for installing a water outlet pipe valve 4; the water outlet pipe valve 4 is connected with the water outlet pipe 5; the other end of the water outlet pipe 5 is connected to a floor drain; the bottom of the third side surface of the constant water level water tank 1 is provided with a hole for installing a communicating pipe valve 6; the communicating pipe valve 6 is connected with a communicating pipe 7; the welt A8 material is iron plate, bores four screw holes, through screwed connection in 1 bottoms of constant water level water tank.
As shown in fig. 4, the crank-slide rod system comprises a vertical rod 9, a lining plate B10, a slide chamber 11, a curved rod 12 and a circular ring 15. The vertical rod 9 is an iron rod, one end of the vertical rod is fully welded on the lining plate A8, and the other end of the vertical rod is fully welded on the lining plate B10; the lining plate B10 is made of an iron plate, four threaded holes are drilled, and the lining plate B is connected with the smoothbore 11 through screws; the slide chamber 11 is made of aluminum alloy and is cuboid, and a cuboid through hole A shown in figure 4 is formed in the slide chamber for placing the curved bar 12; as shown in fig. 5, a through hole B14 is formed in the horizontal plane of the inside of the slide chamber in the other direction perpendicular to the through hole a13, and is used for placing a circular ring 15 on the curved bar 12 shown in fig. 6; the cross section of the through hole B is in the shape of two semicircular sections, the middle of the through hole B is connected with a rectangle, and a circular ring 15 can be just placed in the through hole B; as shown in FIG. 6, the curved rod 12 is Z-shaped, made of mild steel, and has one end sleeved with a circular ring 15 and placed in the slide chamber 11 and the other end connected with a speed reducer 16.
As shown in fig. 7, the transmission system includes a reducer 16, a motor 17, and a plug 18. One end of the speed reducer 16 is connected with the curved rod 12, and the other end of the speed reducer is connected with the motor 17; after the plug 18 is connected with a power supply, the whole device starts to work, and the constant water level water tank 1 is driven by the curved rod 12 to move in a simple harmonic manner.
As shown in fig. 8, the mold box is composed of a mold box frame 19, a mold box bottom plate 20, a mold box left rotating plate 21, a mold box right side plate 22, tempered glass 23, a retaining wall 24, a breakwater 25 and a sensor fixing bracket 26; the model box frame 19 is a framework of the whole model box formed by welding 8 mm thick iron strips; the model box bottom plate 20, the model box rotating left side plate 21 and the model box right side plate 22 are all made of 8 mm iron plates and are welded to the model box frame 19 in a spot welding manner; mold box bottom plate 20 covers the mold box bottom surface; a model box left side rotating plate 21 covers the model box left side surface; the mold box right side plate 22 covers the mold box right side; the two pieces of toughened glass 23 are one centimeter thick and are respectively adhered to the front side and the back side of the model box frame 19 by structural adhesive.
As shown in fig. 9-11, the model box left side rotating plate 21 is made of an iron plate, and is connected with the rotor a21-1 on the model box left side rotating plate 21 and the rotor B19-1 on the model box frame 19 to achieve the purpose of free rotation, and is fixed by a bolt a21-2 on the model box left side rotating plate 21, a bolt B19-2 on the model box frame 19 and a slip; as shown in FIG. 12, a small hole is arranged at the bottom of the right side plate 22 of the model box for installing a water outlet valve 22-1 for accelerating soil consolidation, and a water inlet and outlet valve 22-2 is arranged at the top; the mold box, which is composed of a mold box frame 19, a mold box bottom plate 20, a mold box left side rotating plate 21, a mold box right side plate 22, and tempered glass 23, is sealed except for the top surface.
As shown in fig. 13, the retaining wall 24 is formed by connecting an aluminum alloy plate 24-1, a nylon plate a24-2, a nylon plate B24-3 and angle steel 24-4 into a whole through nuts; the retaining walls 24 are placed at different positions on the top of the model box frame 19 and used for simulating different excavation widths of a foundation pit; the thickness of the aluminum alloy plate 24-1 is 2 cm; the thickness of the nylon plate A24-2 and the nylon plate B24-3 is consistent with the height of the miniature soil pressure box 27 and is 1 cm; as shown in fig. 14, the aluminum alloy plate 24-1 is sequentially provided with two groups of holes with one cm depth, which are arranged in 2 rows and 2 columns from top to bottom, and used for inserting the rigid supports 29, and different groups of holes can be selected according to experiment requirements to simulate different soil penetration depths; the positions and the depths of the holes can be calculated and adjusted according to the experimental requirements; the nylon plate B24-3 is drilled with 4 rows and 2 columns of round holes, and the nylon plate A24-2 is drilled with 2 rows and 2 columns of round holes for accommodating the miniature soil pressure cell 27; the signal transmission line of the miniature soil pressure cell 27 is led out through the slots carved on the nylon plate A24-2 and the nylon plate B24-3 and is connected to a data acquisition instrument and a power supply device of the miniature soil pressure cell 27; the superposition part of the nylon plate A24-2 and the rigid support 29 is provided with a hole for inserting the rigid support 29; the rigid supports 29 are four aluminum alloy cylinders, the diameters and the lengths of the four aluminum alloy cylinders need to be calculated, one end of each rigid support is connected with the retaining wall 24 through corresponding holes drilled in the aluminum alloy plate 24-1 and the nylon plate A24-2, and the other end of each rigid support is abutted against the left rotating plate 21 of the model box; the bottoms of the aluminum alloy plate 24-1, the nylon plate A24-2 and the nylon plate B24-3 are sealed by glass cement; the gap between the retaining wall 24 and the tempered glass 23 is sealed by organic glass.
As shown in fig. 15, the breakwater 25 has a right-angle trapezoid cross section, and is formed by organic glass plates with a thickness of 1 cm through glass cement, and is laid on the seabed; the gap between the breakwater 25 and the toughened glass 23 is sealed by organic glass; as shown in fig. 16, the sensor fixing bracket 26 is formed by spot-welding a cylindrical slender iron rod to the center of a square thin iron plate and is placed at different positions of the bottom of a model box, a groove is machined in the sensor fixing bracket 26 to facilitate the placement of the pore pressure sensor 28, the radian of the groove needs to be consistent with that of the pore pressure sensor 28, and the position is strictly determined according to the design.
The measuring system comprises a miniature soil pressure box 27 and a pore pressure sensor 28; the miniature soil pressure cell 27 is embedded in holes reserved in a nylon plate A24-2 and a nylon plate B24-3, the number of the miniature soil pressure cells is 12, the thickness of the miniature soil pressure cell is consistent with that of the nylon plate A and the nylon plate B, and a signal transmission line of the miniature soil pressure cell 27 is led out through wire grooves reserved in the nylon plate A24-2 and the nylon plate B24-3 and is connected to a data acquisition instrument and a miniature soil pressure cell 27 power supply device, so that the surface of the soil pressure cell is flush with the surface of a retaining wall, and stress concentration is avoided; the hole pressure sensor 28 is mounted on the sensor fixing bracket 26 by using a bandage; the sensor fixing bracket 26 has a groove on its side, and its curvature is identical to that of the hole pressure sensor 28.
The working process of the invention is as follows: firstly, a constant water level water tank 1 is connected with a lining plate A8 through screws, and a lining plate B10 is fixed on a slide chamber 11 through screws; then the circular ring 15 is placed at a designated position through the through hole B, one end of the curved rod 12 penetrates through the circular ring 15 and is placed in the through hole A, and the other end of the curved rod is connected with the speed reducer 16; the reducer 16 is connected with the motor 17 through screws and nuts; the same operation is then performed for the other set of levers 12, ring 15, reducer 16, and motor 17.
Then according to the serial number, the pore pressure sensor 28 of each section is fixed on the corresponding sensor fixing bracket 26, the installed sensor fixing bracket 26 is arranged on the model box bottom plate 20 according to the position corresponding to the longitudinal section, and the signal transmission line of the pore pressure sensor 28 is guided to the outside of the model box according to the sequence of the sensor fixing bracket 26, the model box bottom plate 20 and the toughened glass 23; placing the miniature soil pressure cell 27 in the holes corresponding to the nylon plate A24-2 and the nylon plate B24-3, and leading out the signal transmission line of the miniature soil pressure cell 27 through the slots carved on the nylon plate A24-2 and the nylon plate B24-3; connecting an aluminum alloy plate 24-1, a nylon plate A24-2, a nylon plate B24-3 and angle steel 24-4 through screws and reserved screw holes, and sealing the bottoms of the aluminum alloy plate 24-1, the nylon plate A24-2 and the nylon plate B24-3 by using glass cement; installing a retaining wall 24 at a designed position, inserting a rigid support 29 between the retaining wall 24 and the left rotating plate 21 of the model box, and sealing a gap between the retaining wall 24 and the toughened glass 23 by using glass cement; preparing a foundation by adopting an underwater throwing and filling method, ensuring that the water depth in a model box is about 5 cm before throwing and filling a soil body, uniformly and slowly throwing the soil body, uniformly pushing and sweeping the soil body which is thrown and finished on each layer for 2-3 times along the axis of a water channel by using a broom, reducing closed bubbles in the soil body, standing for 2 hours when the soil body of 20 cm is filled, and paying attention to the protection of a pore pressure gauge in the soil filling process; when the soil mass is filled to the elevation of the pit bottom, stopping filling the soil mass in the foundation pit; continuously filling soil outside the foundation pit to the height of the seabed, placing the breakwater 25 at a designed position, and sealing a gap between the breakwater 25 and the toughened glass 23 by adopting glass cement; and continuously filling the soil between the retaining wall 24 and the breakwater 25 to a designed height.
Finally, opening a water inlet pipe valve 2, a water outlet pipe valve 4 and a communicating pipe valve 6; connecting a water inlet pipe 3 with a water source; connecting a water outlet pipe 5 with a floor drain, connecting a communicating pipe 7 with a water inlet and outlet valve 22-2, and opening a water source to inject water into the constant water level water tank 1; when the water level rises to the position of the water outlet pipe, the water inlet and outlet rates are controlled to be the same by adjusting the valve 2 of the water inlet pipe and the valve 4 of the water outlet pipe, so that the water level in the constant water level water tank 1 is controlled to be constant. Both plugs 18 are then simultaneously connected to the power supply. The constant water level water tank 1 can rotate along with the curved rod 12 to move in a simple harmonic manner in the vertical direction. Opening the water inlet and outlet valve 26, when the constant water level water tank 1 moves upwards along with the curved rod 12, part of water enters the model box through the communicating pipe 7; when the constant water level water tank 1 moves downwards along with the curved rod 12, part of water enters the constant water level water tank 1 from the model box through the communicating pipe 7 and is discharged through the water outlet pipe 5, so that a simple harmonic fluctuation boundary water head for simulating tidal load is realized; then, connecting the data lines of the miniature soil pressure box 27 and the pore pressure sensor 28 to the corresponding data acquisition instrument and the power supply device; and collecting data transmitted by the miniature soil pressure cell 27 and the pore pressure sensor 28.
Thus, a set of experiments is completed, and all the experiments are completed by changing the tide factors, the depth of the earth penetration of the retaining wall 24, the distance from the retaining wall 24 to the left side plate 21 of the model groove or the distance from the breakwater 25 to the retaining wall 24 by repeating the above steps.
Claims (10)
1. A dynamic response test device for a coastal foundation pit under the action of a simulated tidal load is characterized by comprising a water level constant system, a crank slide rod system, a transmission system, a measuring system and a model box; the water level constant system comprises a constant water level water tank (1), a water inlet pipe valve (2), a water inlet pipe (3), a water outlet pipe valve (4), a water outlet pipe (5), a communicating pipe valve (6), a communicating pipe (7) and a lining plate A (8); the crank slide bar system comprises a vertical bar (9), a lining plate B (10), a slide chamber (11), two curved bars (12) and two circular rings (15); the transmission system comprises a speed reducer (16), a motor (17) and a plug (18); the top of the first side surface of the constant water level water tank (1) is provided with a hole for installing a water inlet pipe valve (2); the water inlet pipe valve (2) is connected with a water source through a water inlet pipe (3); the center of the second side surface of the constant water level water tank (1) is provided with a hole for mounting a water outlet pipe valve (4); the water outlet pipe valve (4) is connected with one end of the water outlet pipe (5); the other end of the water outlet pipe (5) is connected to a floor drain; a hole is formed in the bottom of the third side face of the constant water level water tank (1) and used for installing a communicating pipe valve (6); the communicating pipe valve (6) is connected with one end of the communicating pipe (7), and the other end of the communicating pipe (7) is connected with the water inlet and outlet valve (22-2); the lining plate A (8) is fixed at the bottom of the constant water level water tank (1); the lining plate B (10) is fixed at the top of the smoothbore (11); one end of the vertical rod (9) is fixedly connected with the lining plate A (8), and the other end of the vertical rod is fixedly connected with the lining plate B (10); the slide chamber (11) is cuboid, a strip-shaped through hole A (13) is formed in the vertical plane corresponding to the long side, a through hole B (14) is formed in the vertical plane corresponding to the short side, the through hole A (13) and the through hole B (14) are in the same horizontal plane and are perpendicular to each other, and the two circular rings (15) respectively penetrate through the through holes B (14) on the two sides and are placed at the designated positions of the through holes A (13); the bent rod (12) is Z-shaped, one end of the bent rod is sleeved in the circular ring (15), the other end of the bent rod is connected with the speed reducer (16), the speed reducer (16) is connected with the motor (17), and the motor (17) is connected with a power supply through a plug (18);
the measuring system comprises a miniature soil pressure box (27) and a pore pressure sensor (28); the model box consists of a model box frame (19), a model box bottom plate (20), a model box left rotating plate (21), a model box right side plate (22), toughened glass (23), a retaining wall (24), a breakwater (25) and a sensor fixing support (26); the model box frame (19) is formed by welding iron bars; the model box bottom plate (20) and the model box right side plate (22) are both made of iron plates and are welded on the model box frame (19); the model box left side rotating plate (21) is made of an iron plate, and is connected with a rotor A (21-1) on the model box left side rotating plate (21) and a rotor B (19-1) on the model box frame (19) so as to achieve the purpose of free rotation, and is fixed by a bolt A (21-2) on the left side of the model box left side rotating plate (21), a bolt B (19-2) on the model box frame (19) and a cutting slip; the bottom of the right side plate (22) of the model box is provided with a small hole for installing a water outlet valve (22-1) for accelerating soil consolidation, and the top of the model box is provided with a water inlet and outlet valve (22-2); the toughened glass (23) is adhered to the model box frame (19) through structural adhesive; the retaining wall (24) comprises an aluminum alloy plate (24-1), the middle lower parts of the two sides of the aluminum alloy plate (24-1) are respectively riveted with a nylon plate A (24-2) and a nylon plate B (24-3), an angle steel (24-4) with an L-shaped cross section is fixed on the upper part of the aluminum alloy plate (24-1), the retaining wall (24) is placed at the top of the model box frame (19) through the angle steel (24-4), and the retaining wall (24) is connected with a left rotating plate (21) of the model box through a rigid support (29); circular holes are drilled in the nylon plate A (24-2) and the nylon plate B (24-3), and miniature soil pressure boxes (27) are arranged in the circular holes; the cross section of the breakwater (25) is in a right-angle trapezoid shape, is formed by organic glass plates through glass cement and is placed on a seabed, and the seabed is formed by filling soil samples in a model box according to design requirements; the sensor fixing support (26) is formed by welding a cylindrical long and thin iron rod to the center of a square thin iron plate in a spot welding mode and is placed at different positions on a bottom plate (20) of the model box, a groove is formed in the sensor fixing support (26) in a lathed mode, and a hole pressure sensor (28) is arranged in the groove.
2. The device for simulating the dynamic response of the offshore foundation pit under the action of the tidal load according to claim 1, wherein the cross section of the through hole B (14) is in the shape of two semicircular sections, the middle of the through hole B is connected with a rectangle, and a circular ring (15) can be just placed in the through hole B.
3. The device for simulating the dynamic response test of the offshore foundation pit under the action of tidal load according to claim 1, wherein the bent rod (12) is formed by mutually welding three cylindrical rods with circular cross sections; the diameter of the curved rod (12) is consistent with the inner diameter of the circular ring (15).
4. The device for simulating the dynamic response of the offshore foundation pit under the tidal load action according to claim 1, wherein the lining plate A (8) is made of a metal plate, is drilled with four threaded holes, and is connected to the bottom of the constant water level water tank (1) through screws; the lining plate B (10) is made of an iron plate, four threaded holes are drilled, and the lining plate B is connected with the smoothbore (11) through screws.
5. The device for simulating the dynamic response of the offshore foundation pit under the tidal load action according to claim 1, wherein the vertical rods (9) are iron rods, one end of each iron rod is fully welded on the lining plate A (8), and the other end of each iron rod is fully welded on the lining plate B (10).
6. The device for simulating the dynamic response of the offshore foundation pit under the tidal load action according to claim 1, wherein holes with 2 rows and 2 columns as a group and three groups with one centimeter in depth are sequentially formed in the aluminum alloy plate (24-1) from top to bottom for inserting rigid supports (29), different groups of holes can be selected according to experimental requirements for simulating different soil penetration depths, and the distance from the retaining wall (24) to the left rotating plate (21) of the model box can be adjusted for simulating different excavation widths of the foundation pit.
7. The device for simulating the dynamic response of the offshore foundation pit under the action of tidal loads according to claim 1, wherein the breakwater (25) can be placed at different positions on the seabed for researching the influence caused by different distances from the breakwater (25) to the retaining wall (24).
8. The device for simulating the dynamic response of the offshore foundation pit under the action of tidal loads according to claim 1, wherein the nylon plate A (24-2) and the nylon plate B (24-3) are respectively drilled with an array of circular holes.
9. The device for simulating the dynamic response of the offshore foundation pit under the action of tidal load according to claim 1, wherein the thickness of the miniature soil pressure cell (27) is consistent with that of the nylon plate A (24-2) and the nylon plate B (24-3), and a signal transmission line of the miniature soil pressure cell (27) is led out through a wire groove carved on the nylon plate A (24-2) and the nylon plate B (24-3) and is connected to a data acquisition instrument and a power supply device of the miniature soil pressure cell (27).
10. The device for simulating the dynamic response of the offshore foundation pit under the action of tidal load according to claim 1, wherein the curvature of the outer diameter of the pore pressure sensor (28) is consistent with that of a groove on the sensor fixing support (26), and the pore pressure sensor is fixed on the sensor fixing support (26) through a ligature belt; and the signal transmission line of the pore pressure sensor (28) is connected to a data acquisition instrument and a pore pressure sensor (28) power supply device along the sequence of the sensor fixing bracket (26), the model box bottom plate (20) and the toughened glass (23).
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| JP2002332621A (en) * | 2001-05-08 | 2002-11-22 | Kajima Corp | Tidal wave experimental device |
| CN101403918A (en) * | 2008-11-10 | 2009-04-08 | 中国水利水电科学研究院 | Automatic control device and control method for maritime works model tide simulation |
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