A test device for simulating the impact of submarine mud flow on a pile foundation structure

Abstract

The present application relates to the technical field of marine pile foundation engineering, in particular to a kind of simulation seabed mud flow impact pile foundation structure test device, including model box, pile body and test system, also including the silo with mud flow soil body inside, the top of silo is communicated with air pressurization component, the bottom of silo is connected with one end of release pipe, the other end of release pipe is communicated with model box inside, valve for controlling the on-off state of release pipe is connected on release pipe, and angle adjusting component for adjusting the release angle of mud flow soil body is also included.The present application uses air pressurization component as drive, significantly improves the release speed of mud flow soil body, and can also flexibly adjust the release speed of mud flow soil body by setting different pressurization amounts, truly reflects the characteristics of fast seabed mud flow speed and strong impact force, and can flexibly match different seabed inclination angles through angle adjusting component, to meet the simulation needs of seabed high-speed mud flow dynamic characteristics in various different nearshore pile foundation engineering scenarios.

Description

Technical Field

[0001] This invention relates to the field of marine pile foundation engineering technology, specifically to a test device for simulating the impact of seabed mudflows on pile foundation structures. Background Technology

[0002] With the continuous advancement of the maritime power strategy, the development and utilization of marine resources are accelerating, leading to a significant increase in the number of pile foundation structures for offshore wind turbines, offshore drilling platforms, and offshore photovoltaic systems. Simultaneously, the impact of marine geological disasters on marine pile foundation engineering facilities is becoming increasingly prominent, with submarine landslides becoming a major factor causing damage and failure of marine engineering structures. Under the influence of the marine environment, submarine landslides undergo soil-water exchange during movement, and their movement patterns can be categorized as collapse, sliding, mudflow, and turbidity currents. Submarine collapse and sliding retain the mechanical characteristics of the soil, exhibiting high density and relatively slow velocity. After the soil-water exchange reduces the density, they gradually transform into non-Newtonian fluids, namely submarine mudflows. Due to the water-sliding effect, submarine mudflows are characterized by high flow velocity and strong impact force, significantly impacting infrastructure such as pile foundations and pipelines within the path of the submarine landslide.

[0003] In existing research, some scholars have used theoretical analysis and numerical simulation methods to explore the kinematic characteristics of submarine landslides after instability and their impact effects on engineering structures. However, because such studies rely on many idealized assumptions, their results have limited agreement with actual submarine landslide processes. In contrast, physical model tests can visually reproduce the dynamic characteristics of submarine landslides under controlled conditions, making them an important means of studying landslide impact mechanisms and structural responses.

[0004] Existing flume mudflow simulation devices mostly employ gravity-fed trough structures, releasing mudflows by opening bottom valves or removing baffles to simulate the movement of seabed mudflows. These devices primarily rely on gravitational potential energy to allow the mudflow to flow naturally, making it impossible to control the flow velocity and simulate the high-speed flow characteristics generated by the hydroplaning effect in actual seabed mudflows. Consequently, they cannot accurately simulate the impact loads of high-speed mudflows on pile foundation projects. Furthermore, existing flume mudflow simulation devices cannot flexibly adapt to various seabed inclination angles, making it difficult to meet the simulation requirements of high-speed seabed mudflow dynamics in various nearshore pile foundation engineering scenarios. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a test device for simulating the impact of seabed mudflows on pile foundation structures. This device can accurately simulate the characteristics of actual seabed mudflows and can freely and flexibly adjust the release speed and release angle of the mudflow soil according to the test requirements. This solves the problems of existing water tank mudflow simulation devices, which cannot control the flow velocity of the mudflow soil, cannot simulate the high-speed flow characteristics generated by the hydroplaning effect during actual seabed mudflows, cannot flexibly match various seabed inclination angles, and cannot meet the simulation requirements of the dynamic characteristics of high-speed seabed mudflows in various nearshore pile foundation engineering scenarios.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A test device for simulating the impact of seabed mudflow on pile foundation structures includes a model box with seabed soil at the bottom, a pile inserted into the seabed soil at the bottom, and a test system. It also includes a hopper containing mudflow soil inside, the top of the hopper being connected to an air pressurization component, and the bottom of the hopper being connected to one end of a release pipe. The other end of the release pipe is connected to the inside of the model box. A valve for controlling the on / off state of the release pipe and an angle adjustment component for adjusting the release angle of the mudflow soil are connected to the release pipe.

[0008] Furthermore, the air pressurization assembly includes an air compressor, an air tank, a first air supply pipe for connecting the air compressor and the air tank, and a second air supply pipe for connecting the air tank and the silo, with a pressure regulating valve connected to the second air supply pipe.

[0009] Furthermore, the angle adjustment component includes a frame with an opening on one side and a cavity structure. A turntable is rotatably connected inside the frame. The turntable has a channel through which a release tube passes through the turntable in the circumferential direction. The outlet of the channel faces the opening of the frame. The frame has a first through hole through which the release tube passes. After passing through the first through hole of the frame and the channel of the turntable, the release tube communicates with the inside of the model box.

[0010] Furthermore, the turntable has multiple angled holes in the circumferential direction, and a second through hole is provided on the frame. The turntable is locked by inserting a screw through the second through hole of the frame into one of the angled holes.

[0011] Furthermore, the frame is provided with an arc-shaped track inside, which is coaxial with the turntable, and a limiting rod is provided on the turntable that is movably connected to the arc-shaped track.

[0012] Furthermore, the channel of the turntable is wedge-shaped.

[0013] Furthermore, the lower part of the frame is provided with positioning claws.

[0014] Furthermore, the hopper is located above the model box, the first through hole of the frame and the bottom of the hopper are located in the same vertical direction, and a limiting cylinder coaxial with the first through hole is provided inside the frame.

[0015] Furthermore, the hopper is equipped with a stirring assembly, including a motor located outside the hopper, a rotating shaft passing through one side wall of the hopper and connected to the motor output shaft, and stirring blades located on the rotating shaft.

[0016] Furthermore, the model box is equipped with U-shaped wave-damping plates on the release direction of the mudflow soil and on its opposite side. The wave-facing surface of the wave-damping plate is lower than the wave-repellent surface, and multiple wave-damping holes are opened on both the wave-facing surface and the arc surface of the wave-damping plate.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This invention provides a physical model device for simulating the impact of high-speed seabed mudflows on pile foundation structures. It avoids the idealized assumptions that deviate from actual working conditions in theoretical calculations and numerical simulations. Based on the actual engineering characteristics of the required study area, it can conveniently conduct simulations of the physical mechanisms and dynamic response characteristics of seabed mudflows impacting pile foundation structures under different impact velocities and site slopes.

[0019] This invention employs an air pressurization component as the drive, significantly improving the release speed of the mudflow compared to traditional gravity-fed release structures. This enables high-speed jet release of the mudflow and allows for flexible adjustment of various release speeds by setting different pressurization levels. Simultaneously, it avoids uneven release caused by mudflow adhering to the hopper walls, ensuring complete discharge of the mudflow from the hopper. This controls experimental variables, effectively improving the repeatability and comparability of the results, and accurately reflecting the characteristics of high-speed, high-impact seabed mudflows. Furthermore, this invention incorporates an angle adjustment component, which can flexibly match various seabed tilt angles to meet the simulation requirements of high-speed seabed mudflow dynamics in various nearshore pile foundation engineering scenarios. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the overall planar structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the silo in this invention;

[0023] Figure 4 This is a schematic diagram of the angle adjustment component in this invention;

[0024] Figure 5This is a cross-sectional view of the angle adjustment component in this invention;

[0025] Figure 6 This is a schematic diagram of the structure when the rotation angle of the turntable in this invention is 0.

[0026] Figure 7 This is a schematic diagram of the structure of the turntable in this invention when the rotation angle is 30°;

[0027] Figure 8 This is a schematic diagram of the wide-mouth side channel structure of the turntable in this invention;

[0028] Figure 9 This is a schematic diagram of the narrow-mouth side channel structure of the turntable in this invention;

[0029] Figure 10 This is a schematic diagram of the rear frame structure in this invention;

[0030] Figure 11 This is a schematic diagram of the wave-damping plate in this invention.

[0031] The attached figures are labeled as follows:

[0032] 1. Model box; 11. Seabed soil; 12. Water body; 13. Wave damping plate; 131. Wave damping hole; 2. Hopper; 21. Hopper cover; 212. Pressure monitoring gauge; 213. Pressure relief valve; 214. Motor; 22. Hopper body; 221. Shaft; 222. Mixing blade; 3. Pile body; 4. Frame; 5. Release pipe; 6. Valve; 7. Air pressurization assembly; 71. Air compressor; 72. Air storage tank; 73. First air supply pipe; 7 4. Second gas supply pipe; 75. Pressure regulating valve; 8. Angle adjustment assembly; 81. Front cover; 82. Rear frame; 821. First through hole; 822. Second through hole; 823. Limiting cylinder; 824. Arc track; 826. Screw; 83. Turntable; 831. Channel; 832. Rotating rod; 833. Limiting rod; 834. Angle hole; 91. Laser displacement gauge; 92. Pore water pressure gauge; 93. Strain gauge; 94. High-speed camera. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0034] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0035] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0037] For easier understanding, please refer to Figures 1 to 11 This embodiment provides a test device for simulating the impact of seabed mudflows on pile foundation structures. It includes a rectangular transparent model box 1, with seabed soil 11 laid at the bottom and water 12 placed on top of the soil. The seabed soil 11 simulates the actual seabed structure. The bottom of a pile 3 is inserted into the seabed soil 11, positioning it vertically and slightly to the right of the center of the model box 1. A hopper 2 is located slightly to the left of the top of the model box 1, pre-filled with mudflow soil. Specifically, the hopper 2 is mounted above the model box 1 via a frame 4. The top of the hopper 2 is connected to an air pressurization component 7, and the bottom of the hopper 2 is connected to one end of a release pipe 5. The other end of the release pipe 5 extends into the interior of the model box 1, thus communicating with its interior. A certain amount of air pressure is applied to the material hopper 2 by the air pressurization component 7, which applies pressure to the mud flow material in the material hopper 2, causing the mud flow material to be released and ejected into the model box 1 along the path of the release pipe 5, so as to simulate the actual flow velocity of seabed mud flow in actual engineering. A valve 6 is connected to the release pipe 5, which controls the opening and closing state of the release pipe 5. Preferably, the valve 6 is an electromagnetic ball valve. After the release pipe 5 is connected in series with the valve 6, an angle adjustment component 8 is also connected. The angle adjustment component 8 is used to adjust the release angle of the mud flow material, that is, to adjust the angle between the opening of the release pipe 5 and the horizontal plane, ensuring that the opening of the release pipe 5 is nearly parallel to the surface of the laid seabed soil 11, so as to simulate the seabed mud flow that occurs on the seabed with different gentle slope angles in actual engineering.

[0038] The air pressurization assembly 7 includes an air compressor 71 and an air tank 72. The air compressor 71 and the air tank 72 are connected by a first air supply pipe 73, and the air tank 72 is connected to the hopper 2 by a second air supply pipe 74. A pressure regulating valve 75 is connected in series on the second air supply pipe 74. The pressure applied to the inside of the hopper 2 is controlled and adjusted by the pressure regulating valve 75. Preferably, the pressure regulating valve 75 is an electromagnetic pressure regulating valve 75. Specifically, a pressurization hole is opened at the top of the hopper 2 (located behind the motor 214, and the pressurization hole is blocked by the motor 214 in the attached drawing). One end of the second air supply pipe 74 is connected to the air tank 72, and the other end of the second air supply pipe 74 is connected to the pressurization hole, thereby realizing the supply of air from the air tank 72 to the inside of the hopper 2. Furthermore, the top of the silo 2 is also equipped with a pressure monitoring gauge 212 and a pressure relief valve 213. The pressure monitoring gauge 212 monitors the actual pressure in real time for easy observation and recording. At the same time, when the pressure in the silo 2 or the second air supply pipe 74 exceeds the preset maximum pressure of the pressure relief valve 213, the pressure relief valve 213 will automatically open to perform pressure relief, ensuring the safety of the entire device during the test.

[0039] Angle adjustment component 8 is located inside the model box 1. It includes a frame with an open right side and a hollow structure. A turntable 83 is rotatably connected inside the frame. A channel 831 is formed inside the turntable 83, extending circumferentially through both sides of the turntable 83. The outlet of the channel 831 faces the same direction as the open side of the frame, which is to the right. A vertical first through hole 821 is formed at the top of the frame, through which the release tube 5 passes. The first through hole 821 and the bottom opening of the hopper 2 are located in the same vertical direction. A limiting cylinder 823 is located below the first through hole 821, coaxial with the first through hole 821. The limiting cylinder 823 limits a portion of the vertical section of the release tube 5, preventing it from shifting due to excessive release pressure. Preferably, the release tube 5 is a flexible metal hose, capable of withstanding a certain output pressure while being stretchable and bendable. After one end of the release pipe 5 is connected to the bottom of the hopper 2, the other end of the release pipe 5 extends vertically downwards, passing through the first through hole 821 and the limiting cylinder 823 in sequence. After bending, it passes through the channel 831 of the turntable 83 and finally protrudes to the right side of the frame. That is, the release pipe 5 connects the hopper 2 and the model box 1. By rotating the turntable 83, the opening angle of the release pipe 5 can be adjusted, thereby adjusting the release angle of the mud flow. Furthermore, the frame includes a front cover 81 and a rear frame 82. The back of the turntable 83 is rotatably connected to the rear frame 82 via a bearing. The front of the turntable 83 extends axially upwards with a rotating rod 832. The rotating rod 832 passes through the front cover 81 and is rotatably connected to the front cover 81 via a bearing. When it is necessary to adjust the angle of the turntable 83, the rotating rod 832 located outside the front cover 81 can be rotated, thereby driving the turntable 83 to rotate. The front cover 81 and the rear frame 82 are detachably connected, which can be bolted, screwed, snap-fit, etc., and is not limited here.

[0040] The turntable 83 has multiple angle holes 834 on its circumference. Since the nearshore pile foundation projects are usually on gently sloping sites, the actual seabed inclination angle is mostly between 0 and 30°. Therefore, in this embodiment, there are five angle holes 834, which are spaced 6° apart on the circumference of the turntable 83. A second through hole 822 is provided on the upper part of the frame. A screw 826 passes through the second through hole 822 in the vertical direction and is inserted into one of the angle holes 834 of the turntable 83 to lock the turntable 83, ensuring that the turntable 83 will not be passively rotated due to external forces during the test. An arc-shaped track 824 is provided on the inner wall of the frame. The path of the arc-shaped track 824 is the same as the rotation trajectory of the turntable 83, that is, the arc-shaped track 824 is coaxial with the turntable 83, and the arc of the arc-shaped track 824 is 30°. Correspondingly, a limiting rod 833 extending axially is provided on the turntable 83, and the limiting rod 833 moves within the arc-shaped track 824. The arc-shaped track 824 limits the rotation angle of the turntable 83 to within 30°, avoiding excessive bending or direct compression of the release tube 5 due to excessive rotation angle of the turntable 83. The channel 831 inside the turntable 83 has a wedge-shaped structure, in which the wide opening is the inlet end of the release tube 5 (i.e., the end near the bent section of the release tube 5), and the narrow opening is the outlet end of the release tube 5 (i.e., the end near the opening of the release tube 5). The wedge-shaped channel 831 ensures that the bending degree of the release tube 5 is within 90°, while allowing adjustment of the opening angle, further avoiding excessive bending or direct compression of the release tube 5. Specifically, in the initial state, the opening of the release pipe 5 faces horizontally, that is, the rotation angle of the turntable 83 is 0°. At this time, the release pipe 5 abuts against one side of the inner wall of the channel 831 (the upper wall of the channel 831 in the attached figure). When the turntable 83 rotates clockwise, the opening of the release pipe 5 gradually tilts downward until the turntable 83 rotates to 30°. At this time, the release pipe 5 abuts against the other side of the inner wall of the channel 831 (the lower wall of the channel 831 in the attached figure). The lower part of the frame is provided with positioning claws (not shown in the figure). The positioning claws are inserted into the seabed soil 11 to fix the frame and the turntable 83 together in the model box 1. When installing the angle adjustment component 8, firstly, the connecting end of the release pipe 5 enters through the narrow opening of the channel 831 of the turntable 83 and exits through the wide opening of the channel 831. Then, it passes through the limiting cylinder 823 and the first through hole 821 and connects to the valve 6 and the bottom of the hopper 2, so that the open end of the release pipe 5 is engaged with the narrow opening of the channel 831. Then, the turntable 83 connected with the release pipe 5 is rotated and connected to the rear frame 82, so that the limiting rod 833 on the back of the turntable 83 is movably connected to the arc track 824 of the rear frame 82. Then, the front cover 81 is connected to the rear frame 82 on which the turntable 83 is installed, thus completing the connection between the angle adjustment component 8 and the release pipe 5. Finally, the angle adjustment component 8 is inserted into the seabed soil 11 at the preset position through the positioning claw, so that the bottom opening of the hopper 2 is in the same vertical direction as the first through hole 821 and the limiting cylinder 823.

[0041] The silo 2 is equipped with a mixing component. Before releasing the mud and soil from the silo 2, the mixing component agitates the mud and soil to prevent soil stratification due to prolonged settling. Specifically, the silo 2 includes a cover 21 and a body 22. A motor 214 is mounted on the cover 21. The output shaft of the motor 214 is vertically downward and connected to a rotating shaft 221. The rotating shaft 221 is rotatably connected to the cover 21 and extends through the cover 21 into the body 22. An agitator 222 is connected to the end of the rotating shaft 221. More specifically, a pressure port, a pressure gauge 212, and a pressure relief valve 213 are all located on the cover 21. The bottom of the body 22 is open and connected to one end of the release pipe 5. The lower part of the cover 21 and the upper part of the body 22 have corresponding grooves, and a sealing ring is installed inside the groove to ensure airtightness between the cover 21 and the body 22. The cover 21 and the body 22 are connected by bolts.

[0042] The model box 1 contains two wave-damping plates 13, located on the left and right sides of the model box 1, respectively, on the side opposite to the release direction of the mudflow. Each wave-damping plate 13 has a U-shaped structure, with its wave-facing surface lower than its wave-repellent surface. Multiple wave-damping holes 131 are provided on both the wave-facing surface and the central arc surface of the wave-damping plate 13. Based on the energy dissipation mechanism of waves, the wave-damping plates 13 generate waves during the release of the mudflow. When the waves reach the wave-damping plates 13, some wave energy is absorbed and dissipated through the horizontal wave-damping holes 131 on the wave-facing surface. When the waves enter the central arc surface of the wave-damping plate 13, the waves are trapped within the arc surface through the wave-damping holes 131, further absorbing and dissipating some wave energy. This gradual dissipation of wave energy reduces the impact of wave reflection on the experimental results. Furthermore, the wave-damping plate 13 is fixedly installed on the surface of the water body 12 inside the model box 1.

[0043] The testing system includes various sensing and image acquisition devices for collecting and acquiring key response data during the test process, and can be configured accordingly based on test requirements. In this embodiment, the testing system includes a laser displacement gauge 91, a pore water pressure gauge 92, strain gauges 93, and a high-speed camera 94. Specifically, the laser displacement gauge 91 is installed on the rear side of the model box 1 and horizontally aligned with the pile 3 (in the attached figure, the laser displacement gauge 91 is located directly behind the pile 3). The laser displacement gauge 91 is used to acquire the displacement time history data of the pile 3 during the impact process. The pore water pressure gauge 92 is embedded in the seabed soil 11 and is used to collect the pore water pressure response of the seabed soil 11 under the impact of mudflow. There are multiple strain gauges 93, which are respectively attached to the pile 3 at intervals in the circumferential and axial directions. The strain gauges 93 are used to measure the strain time history changes of the pile 3, and can also obtain bending moment data through background calculation. The high-speed camera 94 is installed in front of the model box 1 and is used to record the motion characteristics of the mudflow and its interaction with the pile 3. The high-speed camera 94 and pore water pressure gauge 92 are used to obtain the velocity and motion pattern of high-speed seabed mudflow, the pore water pressure variation of the seabed, and the interaction between high-speed seabed mudflow and pile foundation structure. At the same time, the dynamic response of pile foundation structure under the action of high-speed seabed mudflow is obtained through numerical feedback calculation using laser displacement gauge 91 and strain gauge 93, including the displacement, strain, and bending moment of pile foundation structure as a function of time. This provides a basis for the disaster resistance and mitigation design of marine engineering pile foundation structures.

[0044] A test method based on the above-mentioned simulated submarine mudflow impact pile foundation structure test device includes the following steps:

[0045] S1. Preparation of seabed soil 11: Based on the soil parameters of the actual research area, kaolin, sand and water are mixed and stirred evenly under a vacuum mixer, then laid in layers in model box 1 and cured for 48 hours.

[0046] S2. Install pile 3 and set up the corresponding testing system: Insert pile 3 vertically into the cured seabed soil 11, set up the required testing instruments at the corresponding points, fill the model box 1 with water until the test water level is reached, and let it stand for 24 hours again.

[0047] S3. Preparation of mudflow soil: The preparation process of mudflow soil is similar to that of seabed soil 11. The water-soil ratio is adjusted according to the experimental requirements and the mixture is stirred evenly under a vacuum mixer. After preparation, the mixture is placed into the silo 22 and the silo cover 21 is closed for a corresponding sealing connection. The motor 214 can be turned on to stir the mudflow soil that is standing in the silo 2 as needed.

[0048] S4. Determine the release angle of the mudflow: After connecting the angle adjustment component 8 to the release pipe 5, rotate the rotating rod 832 according to the test requirements to adjust the rotation angle of the turntable 83, thereby adjusting the release angle of the mudflow. The screw 826 passes through the second through hole 822 and is inserted into the corresponding angle hole 834 to achieve the positioning of the rotation angle of the turntable 83.

[0049] S5. Instrument Inspection and Adjustment: Inspect the air compressor 71, air tank 72, pressure regulating valve 75, silo 2 and valve 6 in sequence, and at the same time check all air supply lines (including the first air supply line 73, the second air supply line 74, etc.) and release pipe 5.

[0050] S6. Adjust the pressurization pressure to the required value for the test: According to the test requirements, turn on the air compressor 71 to supply air to the air tank 72, wait for the air tank 72 to be filled to a certain pressure, open the pressure regulating valve 75 to supply air to the material hopper 2, wait for the material hopper 2 to be pressurized to the specified pressure, and close the pressure regulating valve 75.

[0051] S7. Release the mud flow: After the material bin 2 is pressurized, open valve 6. The mud flow in the material bin 2 is released all at once under pressure. The mud flow is sprayed into the model box 1 along the path of the release pipe 5, generating a high-speed mud flow that meets the test requirements. At the same time, the test system starts to collect the acquisition and monitoring data of each measuring instrument in real time. After the test, the air storage tank 72 is depressurized.

[0052] S8. Repeated Tests: Depending on the test requirements, the soil mix ratio, pressure, seabed soil inclination angle, mudflow release angle, and other influencing factors can be changed to repeat the tests according to S1 to S7, thereby studying the impact effect of high-speed seabed mudflows on pile foundation projects in different nearshore pile foundation engineering areas.

[0053] Although the present invention has been described using the above preferred embodiments, it is not intended to limit the scope of protection of the present invention. Any changes and modifications made by those skilled in the art to the above embodiments without departing from the spirit and scope of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A test device for simulating the impact of seabed mudflow on pile foundation structures, comprising a model box (1) with seabed soil (11) at the bottom, a pile (3) with its bottom inserted into the seabed soil (11), and a test system, characterized in that, It also includes a silo (2) containing mud flow soil, the top of the silo (2) being connected to an air pressurization component (7), the bottom of the silo (2) being connected to one end of a release pipe (5), the other end of the release pipe (5) being connected to the inside of the model box (1), a valve (6) for controlling the on / off state of the release pipe (5) being connected to the release pipe (5), and an angle adjustment component (8) for adjusting the release angle of the mud flow soil. The angle adjustment component (8) includes a frame with an opening on one side and a cavity structure. A turntable (83) is rotatably connected inside the frame. A channel (831) is provided on the turntable (83) for the release tube (5) to pass through the turntable (83) in the circumferential direction. The outlet of the channel (831) faces the opening of the frame. A first through hole (821) is provided on the frame for the release tube (5) to pass through. After the release tube (5) passes through the first through hole (821) of the frame and the channel (831) of the turntable (83), it communicates with the inside of the model box (1). The turntable (83) has multiple angle holes (834) in the circumferential direction, and a second through hole (822) is provided on the frame. The turntable (83) is locked by inserting a screw (826) through the second through hole (822) of the frame into a certain angle hole (834) of the turntable (83). The hopper (2) is located above the model box (1). The first through hole (821) of the frame and the bottom of the hopper (2) are located in the same vertical direction. The frame is provided with a limiting cylinder (823) coaxial with the first through hole (821).

2. The test device for simulating submarine mudflow impact pile foundation structure according to claim 1, characterized in that, The air pressurization assembly (7) includes an air compressor (71), an air tank (72), a first air supply pipe (73) for connecting the air compressor (71) and the air tank (72), and a second air supply pipe (74) for connecting the air tank (72) and the silo (2). A pressure regulating valve (75) is connected to the second air supply pipe (74).

3. The test device for simulating submarine mudflow impact pile foundation structure according to claim 1, characterized in that, The frame is provided with an arc-shaped track (824) inside, which is coaxial with the turntable (83). A limiting rod (833) is provided on the turntable (83) and is movably connected to the arc-shaped track (824).

4. The test device for simulating submarine mudflow impact pile foundation structure according to claim 1, characterized in that, The channel (831) of the turntable (83) is wedge-shaped.

5. The test device for simulating submarine mudflow impact pile foundation structure according to claim 1, characterized in that, The lower part of the frame is provided with positioning claws.

6. The test device for simulating submarine mudflow impact pile foundation structure according to claim 1, characterized in that, The hopper (2) is equipped with a stirring assembly, including a motor (214) located outside the hopper (2), a rotating shaft (221) that passes through one side wall of the hopper (2) and is connected to the output shaft of the motor (214), and stirring blades (222) located on the rotating shaft (221).

7. The test device for simulating submarine mudflow impact pile foundation structure according to claim 1, characterized in that, The model box (1) is equipped with U-shaped wave-damping plates (13) on the release direction of the mudflow soil and on the opposite side. The wave-facing surface of the wave-damping plate (13) is lower than the back wave surface. Multiple wave-damping holes (131) are opened on the wave-facing surface and the arc surface of the wave-damping plate (13).

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