Testing device for simulating impact of seabed mud flow on pile foundation structure

Abstract

The invention relates to the technical field of ocean pile foundation engineering, in particular to a test device for simulating impact of seabed mud flow on a pile foundation structure, which comprises a model box, a pile body and a test system, and further comprises a stock bin filled with mud flow soil, the top of the stock bin is communicated with an air pressurization assembly, and the bottom of the stock bin is connected with one end of a release pipe; the other end of the release pipe communicates with the interior of the model box, and the release pipe is connected with a valve used for controlling the on-off state of the release pipe and an angle adjusting assembly used for adjusting the release angle of the mud flow soil body. According to the invention, the air pressurization assembly is adopted as a drive, the release speed of the mud flow soil body is obviously improved, various different release speeds of the mud flow soil body can be flexibly adjusted by setting different pressurization amounts, and the characteristics of high flow speed and strong impact force of the seabed mud flow are truly reflected; and through the angle adjusting assembly, various different seabed inclination angles can be flexibly matched so as to meet the simulation requirements of seabed high-speed mud flow power characteristics in various different offshore pile foundation engineering scenes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marine pile foundation engineering, in particular to a test device for simulating the impact of submarine mud flow on pile foundation structure. BACKGROUND

[0002] With the continuous advancement of the strategy of building a strong marine country, the process of marine resource development and utilization is accelerating, and the number of pile foundation structures such as offshore wind turbines, offshore drilling platforms and offshore photovoltaics is significantly increasing. At the same time, the influence of marine geological disasters on marine pile foundation engineering facilities is increasingly prominent, among which submarine landslides have become one of the important factors leading to the destruction and failure of offshore engineering structures. Under the action of seawater environment, the submarine landslide body will exchange water and soil during movement, and its movement form can be divided into collapse, sliding, mud flow and turbidity current. Among them, submarine collapse and sliding maintain the mechanical properties of soil, and their density is large and speed is relatively slow. After the density is reduced through water-soil conversion, they gradually change into non-Newtonian fluid, that is, submarine mud flow. Due to the existence of sliding water effect, submarine mud flow is characterized by fast flow speed and strong impact force, which can cause significant impact on pile foundations, pipelines and other infrastructure within the submarine landslide path.

[0003] In existing research, some scholars use theoretical analysis and numerical simulation methods to study the movement characteristics of submarine landslides after instability and their impact effect on engineering structures. However, due to the dependence of such research on more idealized assumptions, the results have limited agreement with the actual submarine landslide process. In contrast, physical model tests can intuitively reproduce the dynamic characteristics of submarine landslides under controlled conditions, and are an important means of studying landslide impact mechanisms and structural responses.

[0004] Existing water tank mud flow simulation devices mostly use gravity self-flowing type trough structures to release mud flow soil by opening the bottom valve or removing the baffle to simulate the movement process of submarine mud flow. Such devices mainly rely on gravity potential to make mud flow soil flow naturally, and cannot control the flow speed of mud flow soil, making it difficult to simulate the high-speed flow characteristics generated by the sliding water effect in the actual submarine mud flow process, and further cannot accurately simulate the impact load of high-speed mud flow on pile foundation engineering. At the same time, existing water tank mud flow simulation devices cannot flexibly match multiple different seabed inclination angles, making it difficult to meet the simulation needs of the dynamic characteristics of high-speed submarine mud flow in various nearshore pile foundation engineering scenarios. SUMMARY

[0005] The purpose of the present application is to overcome the shortcomings of the prior art, and provide a test device for simulating the impact of submarine mud flow on pile foundation structure, which can accurately simulate the characteristics of actual submarine mud flow, and freely adjust the release speed and release angle of the mud flow soil body according to the test requirements, so as to solve the problems that the existing water tank mud flow simulation device cannot control the flow rate of the mud flow soil body, it is difficult to simulate the high-speed flow characteristics generated by the water sliding effect in the actual submarine mud flow process, it cannot flexibly match a variety of different seabed inclination angles, and it is difficult to meet the simulation requirements of the high-speed mud flow dynamic characteristics of the submarine under a variety of different nearshore pile foundation engineering scenarios.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme: The test device for simulating the impact of submarine mud flow on pile foundation structure comprises a model box with seabed soil body laid at the bottom, a pile body inserted into the seabed soil body at the bottom, and a test system, further comprising a bin with mud flow soil body inside, the top of the bin being communicated with an air pressurizing assembly, one end of a release pipe being connected to the bottom of the bin, the other end of the release pipe being communicated with the inside of the model box, a valve for controlling the on-off state of the release pipe being connected to the release pipe, and an angle adjusting assembly for adjusting the release angle of the mud flow soil body.

[0007] Further, the air pressurizing assembly comprises an air compressor, an air tank, a first air conveying pipe for communicating the air compressor with the air tank, and a second air conveying pipe for communicating the air tank with the bin, and a pressure regulating valve being connected to the second air conveying pipe.

[0008] Further, the angle adjusting assembly comprises a frame body with a cavity structure and an open side, a rotating disc being rotatably connected inside the frame body, a channel being formed in the rotating disc and allowing the release pipe to penetrate the rotating disc in the circumferential direction of the rotating disc, the outlet of the channel being directed towards the open direction of the frame body, a first through hole being formed in the frame body and allowing the release pipe to penetrate, and the release pipe being communicated with the inside of the model box after penetrating the first through hole of the frame body and the channel of the rotating disc.

[0009] Still further, a plurality of angle holes are formed in the circumferential direction of the rotating disc, a second through hole is formed in the frame body in correspondence, and a screw rod is inserted into a certain angle hole of the rotating disc after penetrating the second through hole of the frame body to lock the rotating disc.

[0010] Still further, an arc-shaped track is arranged inside the frame body and coaxial with the rotating disc, and a limiting rod is movably connected to the arc-shaped track on the rotating disc.

[0011] Still further, the channel of the rotating disc is wedge-shaped.

[0012] Still further, a positioning claw is arranged at the lower part of the frame body.

[0013] Further, the silo is arranged above the model box, the first through hole of the frame body is located at the same vertical direction with the bottom of the silo, and a limiting cylinder coaxial with the first through hole is arranged in the frame body.

[0014] Further, the silo is arranged above the model box, the first through hole of the frame body is located at the same vertical direction with the bottom of the silo, and a limiting cylinder coaxial with the first through hole is arranged in the frame body.

[0015] Further, the model box is provided with U-shaped wave absorbing plates on the release direction of the mud flow soil body and the opposite side thereof, respectively, the wave-approaching surface of the wave absorbing plate is lower than the wave-escaping surface, and a plurality of wave absorbing holes are arranged on the wave-approaching surface and the curved surface of the wave absorbing plate.

[0016] Compared with the prior art, the present application has the following advantages: The present application provides a physical model device for simulating high-speed submarine mud flow impact on pile foundation structures, which avoids the idealized assumptions in theoretical calculation and numerical simulation that deviate from actual working conditions, and can conveniently carry out physical mechanism simulation and dynamic response characteristic research of submarine mud flow impact on pile foundation structures under different impact speeds, different site slopes and other working conditions based on the actual engineering characteristics of the required research area.

[0017] Compared with the traditional gravity self-flowing release structure, the air pressurizing assembly is used as the drive, which significantly improves the release speed of the mud flow soil body, realizes high-speed jet release of the mud flow soil body, and can flexibly adjust the release speed of the mud flow soil body in multiple ways by setting different pressurizing amounts, while avoiding the release unevenness caused by the adhesion of the mud flow soil body to the wall surface of the silo, so that the mud flow soil body in the silo is completely discharged, the test variables are controlled, the repeatability and result comparability of the test are effectively improved, and the characteristics of fast flow speed and strong impact force of submarine mud flow are truly reflected. In addition, the angle adjusting assembly is arranged, and the angle adjusting assembly can flexibly match multiple different seabed inclination angles to meet the simulation needs of the dynamic characteristics of high-speed submarine mud flow in multiple different nearshore pile foundation engineering scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present application; Figure 2 It is a schematic diagram of the overall plane structure of the present application; Figure 3 It is a schematic diagram of the structure of the silo in the present application; Figure 4 It is a schematic diagram of the structure of the angle adjusting assembly in the present application; Figure 5 It is a sectional view of the angle adjusting assembly in the present application; Figure 6 It is a schematic diagram of the structure when the rotating angle of the turntable is 0. Figure 7 Figure 3 is a structural schematic diagram of the invention when the rotating angle of the rotating disc is 30°; Figure 8 Figure 4 is a structural schematic diagram of the wide-mouth side channel of the rotating disc of the invention; Figure 9 Figure 5 is a structural schematic diagram of the narrow-mouth side channel of the rotating disc of the invention; Figure 10 Figure 6 is a structural schematic diagram of the rear frame of the invention; Figure 11 Figure 7 is a structural schematic diagram of the wave-damping plate of the invention.

[0019] In the drawings, reference numerals: 1, model box; 11, seabed soil; 12, water body; 13, wave-damping plate; 131, wave-damping hole; 2, silo; 21, silo cover; 212, pressure monitoring gauge; 213, pressure relief valve; 214, motor; 22, silo body; 221, rotating shaft; 222, stirring blade; 3, pile body; 4, rack; 5, release pipe; 6, valve; 7, air pressurization assembly; 71, air compressor; 72, air tank; 73, first air pipe; 74, second air 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-shaped track; 826, screw rod; 83, rotating disc; 831, channel; 832, rotating rod; 833, limiting rod; 834, angle hole; 91, laser displacement meter; 92, pore water pressure meter; 93, strain gauge; 94, high-speed camera. DETAILED DESCRIPTION

[0020] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative work fall within the scope of protection of the present application.

[0021] It should be noted that when an element is referred to as being “fixed to” or “set on” another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0022] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0023] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0024] For ease of understanding, please refer to Figures 1 to 11 The embodiment provides a kind of simulation submarine mud flow impact pile foundation structure test device, including the transparent model box 1 of cuboid structure, the bottom of model box 1 is laid with seabed soil body 11, seabed soil body 11 is equipped with water body 12, seabed soil body 11 is simulated real seabed structure by.The bottom of pile body 3 is inserted into seabed soil body 11, so that pile body 3 is vertically placed in the right side of the middle of model box 1.Hopper 2 is located in the left side above model box 1, hopper 2 is preloaded with mud flow soil body, specifically, hopper 2 is set on the top of model box 1 by rack 4.Hopper 2 top and air pressure assembly 7 are communicated, the bottom of hopper 2 and one end of release pipe 5 are communicated, the other end of release pipe 5 extends to the inside of model box 1, i.e.it is communicated with the inside of model box 1.A certain amount of air pressure is applied to hopper 2 by air pressure assembly 7, i.e.the pressure of mud flow soil body in hopper 2 is applied, so that mud flow soil body is released along the path of release pipe 5 and sprayed into model box 1, to simulate the real flow speed of submarine mud flow in actual engineering.Release pipe 5 is connected with valve 6, and the on-off state of release pipe 5 is controlled by valve 6, preferably, valve 6 is electromagnetic ball valve.Release pipe 5 is also connected with angle adjusting assembly 8 after being connected with valve 6 in series, and angle adjusting assembly 8 is used to adjust the release angle of mud flow soil body, i.e.the included angle between the opening direction of release pipe 5 and horizontal plane is adjusted, to ensure that the opening direction of release pipe 5 is close to parallel state with the surface of laid seabed soil body 11, to simulate submarine mud flow occurring on seabed with different gentle inclination angle in actual engineering.

[0025] The air pressurizing assembly 7 comprises an air compressor 71 and an air tank 72, the air compressor 71 and the air tank 72 are communicated through a first air conveying pipe 73, the air tank 72 and the hopper 2 are communicated through a second air conveying pipe 74, a pressure regulating valve 75 is connected in series on the second air conveying pipe 74, the pressure applied to the inside of the hopper 2 is controlled and adjusted through the pressure regulating valve 75, preferably, the pressure regulating valve 75 is an electromagnetic pressure regulating valve 75. Specifically, a pressurizing hole (located at the rear side of the motor 214, the pressurizing hole is blocked by the motor 214 in the drawings) is arranged at the top of the hopper 2, one end of the second air conveying pipe 74 is connected with the air tank 72, the other end of the second air conveying pipe 74 is connected with the pressurizing hole, thereby realizing the air conveying from the air tank 72 to the inside of the hopper 2. Further, the top of the hopper 2 is also provided with a pressure monitoring table 212 and a pressure relief valve 213, the actual pressure is monitored in real time through the pressure monitoring table 212, which is convenient for observation and recording, at the same time, when the pressure in the hopper 2 or the second air conveying pipe 74 exceeds the preset maximum pressure of the pressure relief valve 213, the pressure relief valve 213 will automatically open to perform the pressure relief action, thereby ensuring the safety of the whole device during the test process.

[0026] The angle adjusting assembly 8 is arranged inside the model box 1, which comprises a frame body, the right side of which is an open side and is a hollow structure, and a rotating disc 83 is rotationally connected inside the frame body, the rotating disc 83 is internally provided with a channel 831, the channel 831 penetrates the left and right sides of the rotating disc 83 in the circumferential direction of the rotating disc 83, and the outlet of the channel 831 faces the same side as the open side of the frame body, i.e., the right side. A vertical first through hole 821 is formed in the upper part of the frame body, the first through hole 821 is provided for the release pipe 5 to penetrate, the first through hole 821 is located in the same vertical direction as the bottom opening of the hopper 2, and a limiting cylinder 823 is arranged below the first through hole 821, the limiting cylinder 823 is coaxial with the first through hole 821, and the limiting cylinder 823 is used to limit the part of the vertical section of the release pipe 5, so as to avoid the deviation of the release pipe 5 due to excessive release pressure. Preferably, the release pipe 5 is a metal hose, which can be telescopic and bent while ensuring a certain output pressure. 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 is vertically downwardly extended, penetrates the first through hole 821 and the limiting cylinder 823 in sequence, penetrates the channel 831 of the rotating disc 83 after being bent, and is finally exposed to the right side of the frame body, i.e., the release pipe 5 is used to realize the communication between the hopper 2 and the model box 1. By rotating the rotating disc 83, the opening angle of the release pipe 5 is adjusted, and the release angle of the mud flow soil body is adjusted. Further, the frame body comprises a front cover 81 and a rear frame 82, the back of the rotating disc 83 is rotationally connected to the rear frame 82 through a bearing, and the front surface of the rotating disc 83 extends in the axial direction and is provided with a rotating rod 832, the rotating rod 832 penetrates the front cover 81 and is rotationally connected to the front cover 81 through a bearing. When it is necessary to adjust the angle of the rotating disc 83, the rotating rod 832 outside the front cover 81 can be rotated, so as to drive the rotating disc 83 to rotate. The front cover 81 and the rear frame 82 are detachably connected, which can be bolted, screwed, buckled, etc., and are not limited here.

[0027] The rotating disc 83 is provided with a plurality of angular holes 834 in the circumferential direction. Since the site is usually a gentle slope in the offshore pile foundation engineering, the actual seabed inclination angle range is mostly 0-30°, so in this embodiment, the angular holes 834 are five and are arranged at an interval of 6° in the circumferential direction of the rotating disc 83. The upper part of the frame body is provided with a second through hole 822, and the rotating disc 83 is locked by inserting a screw rod 826 into a certain angular hole 834 of the rotating disc 83 after penetrating the second through hole 822 of the frame body in the vertical direction, so as to ensure that the rotating disc 83 will not be passively rotated due to external force during the test. An arc-shaped track 824 is arranged on the inner wall of the frame body, and the path of the arc-shaped track 824 is the same as the rotating track of the rotating disc 83, that is, the arc-shaped track 824 is coaxial with the rotating disc 83, and the arc of the arc-shaped track 824 is 30°. Correspondingly, a limiting rod 833 extending in the axial direction is arranged on the rotating disc 83, and the limiting rod 833 is movable in the arc-shaped track 824. The rotating angle of the rotating disc 83 is limited to within 30° by the arc-shaped track 824, so as to avoid excessive bending or direct extrusion of the release pipe 5 due to too large rotating angle of the rotating disc 83. The passage 831 in the rotating disc 83 is a wedge-shaped structure, wherein the wide mouth is the inlet end of the release pipe 5 (i.e. close to one end of the bending section of the release pipe 5), and the narrow mouth is the outlet end of the release pipe 5 (i.e. close to one end of the opening of the release pipe 5). By the wedge-shaped passage 831, the bending degree of the release pipe 5 is ensured to be within 90° on the premise of adjusting the opening angle, so as to further avoid excessive bending or direct extrusion of the release pipe 5. Specifically, in the initial state, the opening of the release pipe 5 faces the horizontal direction, that is, the rotating angle of the rotating disc 83 is 0°. At this time, the release pipe 5 abuts against one side inner wall of the passage 831 (the upper wall of the passage 831 in the drawing). When the rotating disc 83 rotates clockwise, the opening of the release pipe 5 gradually inclines downward until the rotating disc 83 rotates to 30°. At this time, the release pipe 5 abuts against the other side inner wall of the passage 831 (the lower wall of the passage 831 in the drawing). The lower part of the frame body is provided with a positioning claw (not shown in the drawing), which is inserted into the seabed soil 11 to fix the frame body and the rotating disc 83 together in the model box 1. When installing the angle adjusting assembly 8, first, the connecting end of the release pipe 5 is inserted into the narrow mouth of the passage 831 of the rotating disc 83 from the wide mouth of the passage 831, and then is inserted into the limiting cylinder 823 and the first through hole 821 to communicate with the valve 6 and the bottom of the hopper 2, so that the opening end of the release pipe 5 is clamped on the narrow mouth of the passage 831. Then, the rotating disc 83 connected with the release pipe 5 is rotatably connected to the rear frame 82, so that the limiting rod 833 on the back of the rotating disc 83 is movably connected to the arc-shaped track 824 of the rear frame 82. Then, the front cover 81 is connected with the rear frame 82 provided with the rotating disc 83, so that the connection between the angle adjusting assembly 8 and the release pipe 5 is completed. Finally, the angle adjusting assembly 8 is inserted into the seabed soil 11 at the preset position by the positioning claw, so that the bottom opening of the hopper 2, the first through hole 821 and the limiting cylinder 823 are located in the same vertical direction.

[0028] The silo 2 is provided with a stirring assembly. Before releasing the debris flow soil in the silo 2, the stirring assembly is used to stir the debris flow soil, so as to prevent the water and soil from being layered due to long-term standing. Specifically, the silo 2 comprises a silo cover 21 and a silo body 22. The silo cover 21 is provided with a motor 214. An output shaft of the motor 214 is vertically downward connected with a rotating shaft 221. The rotating shaft 221 is rotatably connected to the silo cover 21 and extends through the silo cover 21 to the inside of the silo body 22. The rotating shaft 221 is connected with stirring blades 222 at the end. More specifically, the pressurizing hole, the pressure monitoring table 212 and the pressure relief valve 213 are all arranged on the silo cover 21. The bottom of the silo body 22 is open and connected with one end of the release pipe 5. The lower part of the silo cover 21 and the upper part of the silo body 22 are provided with grooves at the corresponding positions. The grooves are provided with sealing rings to ensure the air tightness of the connection between the silo cover 21 and the silo body 22. The silo cover 21 and the silo body 22 are connected by bolts.

[0029] The model box 1 is provided with two wave absorbing plates 13. The two wave absorbing plates 13 are arranged on the left and right sides inside the model box 1, i.e. on the side opposite to the release direction of the debris flow soil. The wave absorbing plate 13 is in a U-shaped structure, and the wave-approaching surface is lower than the wave-receding surface. The wave-approaching surface and the arc surface of the wave absorbing plate 13 are both provided with a plurality of wave absorbing holes 131. Based on the energy dissipation mechanism of the wave, the wave absorbing plate 13 will raise corresponding waves during the release of the debris flow soil. When the waves propagate to the wave absorbing plate 13, part of the wave energy is absorbed and dissipated through the horizontal wave absorbing holes 131 arranged on the wave-approaching surface of the wave absorbing plate 13. When the waves enter the arc surface of the wave absorbing plate 13, the waves are trapped in the arc surface of the wave absorbing plate 13 through the wave absorbing holes 131 arranged on the arc surface of the wave absorbing plate 13, and part of the wave energy is further absorbed and dissipated through the wave absorbing holes 131 arranged on the arc surface. In this way, the wave energy is gradually consumed, so as to reduce the influence of wave reflection on the test results. Further, the wave absorbing plate 13 is fixedly arranged on the surface of the water body 12 inside the model box 1.

[0030] The test system includes various sensing and image acquisition devices for collecting and acquiring key response data during the test process, which can be configured according to the test requirements. In this embodiment, the test system includes a laser displacement meter 91, a pore water pressure meter 92, a strain gauge 93, and a high-speed camera 94. Specifically, the laser displacement meter 91 is installed on the back side of the model box 1 and is horizontally aligned with the pile body 3 (in the drawing, the laser displacement meter 91 is located directly behind the pile body 3), and the laser displacement meter 91 is used to acquire the displacement time history data of the pile body 3 during the impact process; the pore water pressure meter 92 is buried in the seabed soil 11 and is used to collect the pore water pressure response of the seabed soil 11 under the impact of the mud flow soil; the strain gauge 93 is multiple and is pasted on the pile body 3 at intervals in the circumferential and axial directions of the pile body 3, and the strain gauge 93 is used to measure the strain time history change of the pile body 3, and the bending moment data can also be obtained through background calculation; the high-speed camera 94 is installed in front of the model box 1, and the high-speed camera 94 is used to record the movement characteristics of the mud flow soil and the interaction process between the mud flow soil and the pile body 3. The high-speed seabed mud flow speed, the movement form change law, the pore water pressure change law of the seabed, and the interaction law between the high-speed seabed mud flow and the pile foundation structure are obtained through the high-speed camera 94 and the pore water pressure meter 92. The dynamic response law of the pile foundation structure under the action of the high-speed seabed mud flow is obtained through the numerical feedback calculation of the laser displacement meter 91 and the strain gauge 93, including the displacement, strain, and bending moment of the pile foundation structure change with time, thereby providing a basis for the disaster resistance and mitigation design of the pile foundation structure of the marine engineering.

[0031] A test method based on the above-mentioned simulated seabed mud flow impact pile foundation structure test device, comprising the following steps: S1, preparing the seabed soil 11: according to the soil parameters of the actual required research area, the kaolin clay, sand, and water are mixed uniformly under the vacuum mixer, and are layered and laid in the model box 1, and are cured for 48 hours.

[0032] S2, installing the pile body 3 and arranging the corresponding test system: the pile body 3 is vertically inserted into the cured seabed soil 11, the required test instruments are arranged at the corresponding points, after completion, water is injected into the model box 1 until the test water level, and then it is placed again for 24 hours.

[0033] S3, preparing the mud flow soil: the preparation process of the mud flow soil is similar to that of the seabed soil 11, the water-soil ratio is adjusted according to the test requirements, and the mixture is stirred uniformly under the vacuum mixer. After preparation, the mud flow soil is put into the bin body 22, and the bin cover 21 is closed for corresponding sealed connection. The motor 214 can be started according to the actual needs to stir the mud flow soil in the bin 2.

[0034] S4, determine the release angle of the mud soil body: after connecting the angle adjusting assembly 8 with the release pipe 5, according to the required test, rotate the rotating rod 832 to adjust the rotation angle of the rotating disc 83, and then adjust the release angle of the mud soil body, and then insert the screw rod 826 into the corresponding angle hole 834 through the second through hole 822, so as to realize the positioning of the rotation angle of the rotating disc 83.

[0035] S5, instrument inspection and debugging: check the air compressor 71, the air tank 72, the pressure regulating valve 75, the stock bin 2 and the valve 6 in sequence, and check all gas pipelines (including the first gas pipeline 73, the second gas pipeline 74 and the like) and the release pipe 5.

[0036] S6, adjust the pressurization pressure to the required value of the test: according to the test requirement, open the air compressor 71 to supply air to the air tank 72, wait for the air tank 72 to be inflated to a certain pressure, open the pressure regulating valve 75 to supply air to the stock bin 2, wait for the stock bin 2 to be pressurized to a specified pressure, and then close the pressure regulating valve 75.

[0037] S7, release the mud soil body: after the pressurization of the stock bin 2 is completed, open the valve 6, and the mud soil body in the stock bin 2 is released all at once under pressure, and the mud soil body is sprayed along the path of the release pipe 5 and released into the model box 1, generating a high-speed mud flow that meets the test requirements, and at the same time, the test system starts to collect and monitor the data of each measuring instrument in real time, and after the test is completed, the air tank 72 is depressurized.

[0038] S8, repeat the test: according to the test requirement, the influencing factors such as the soil mixture ratio, the pressurization pressure, the inclination angle of the seabed soil body 11 and the release angle of the mud soil body can be changed, and then the test is repeated according to S1 to S7, so as to study the impact effect of the high-speed seabed mud flow on the pile foundation engineering in different nearshore pile foundation engineering areas.

[0039] Although the present application has been described by the above preferred embodiments, it is not intended to limit the protection scope of the present application, and any person skilled in the art can make various changes and modifications to the above embodiments without departing from the spirit and scope of the present application.

Claims

1. A test device for simulating a submarine mud flow impact pile foundation structure, comprising a model box (1) having a seabed soil body (11) laid on the bottom, a pile body (3) inserted into the seabed soil body (11) on the bottom, and a test system, characterized in that, The mud flow earth body is internally contained in a bin (2), the top of the bin (2) is communicated with an air pressurizing assembly (7), one end of a release pipe (5) is connected to the bottom of the bin (2), the other end of the release pipe (5) is communicated with the inside of a model box (1), a valve (6) for controlling the on-off state of the release pipe (5) is connected to the release pipe (5), and an angle adjusting assembly (8) for adjusting the release angle of the mud flow earth body is further provided.

2. The test apparatus for simulating the impact of submarine mud flow on a pile structure according to claim 1, wherein The air pressurizing assembly (7) comprises an air compressor (71), an air tank (72), a first air pipe (73) for communicating the air compressor (71) with the air tank (72), and a second air pipe (74) for communicating the air tank (72) with the bin (2), and a pressure regulating valve (75) is connected to the second air pipe (74).

3. The test apparatus for simulating the impact of submarine mud flow on a pile structure according to claim 1, wherein The angle adjusting assembly (8) comprises a frame body with an open side and a cavity structure, a rotating disc (83) is rotatably connected inside the frame body, a plurality of passages (831) are formed in the rotating disc (83) and can be penetrated by the release pipe (5) in the circumferential direction of the rotating disc (83), the outlets of the passages (831) are directed towards the opening direction of the frame body, a first through hole (821) is formed in the frame body and can be penetrated by the release pipe (5), and the release pipe (5) is communicated with the inside of the model box (1) after penetrating the first through hole (821) of the frame body and the passages (831) of the rotating disc (83).

4. The test apparatus for simulating the impact of submarine mud flow on a pile structure according to claim 3, wherein A plurality of angle holes (834) are formed in the circumferential direction of the rotating disc (83), a second through hole (822) is formed in the frame body in correspondence with the angle holes (834), and a screw rod (826) is inserted into a certain angle hole (834) of the rotating disc (83) after penetrating the second through hole (822) of the frame body to lock the rotating disc (83).

5. The test apparatus for simulating the impact of submarine mud flow on a pile structure according to claim 4, wherein An arc-shaped track (824) is arranged inside the frame body and coaxial with the rotating disc (83), and a limiting rod (833) is movably connected to the arc-shaped track (824) in correspondence with the rotating disc (83).

6. The test apparatus for simulating the impact of submarine mud flow on a pile structure according to claim 3, wherein The passages (831) of the rotating disc (83) are wedge-shaped.

7. The test apparatus for simulating the impact of submarine mud flow on a pile structure according to claim 3, wherein A positioning claw is arranged at the lower part of the frame body.

8. The test apparatus for simulating the impact of submarine mud flow on a pile foundation structure according to claim 3, wherein The bin (2) is arranged above the model box (1), the first through hole (821) of the frame body and the bottom of the bin (2) are arranged in the same vertical direction, and a limiting cylinder (823) is coaxial with the first through hole (821) and arranged inside the frame body.

9. The test apparatus for simulating the impact of submarine mud flow on a pile structure according to claim 1, wherein A stirring assembly is arranged in the bin (2) and comprises a motor (214) arranged outside the bin (2), a rotating shaft (221) penetrating a side wall of the bin (2) and connected with the output shaft of the motor (214), and stirring blades (222) arranged on the rotating shaft (221).

10. The test apparatus for simulating the impact of submarine mud flow on a pile structure according to claim 1, wherein A U-shaped wave absorbing plate (13) is arranged in the model box (1) in the release direction of the mud flow earth body and on the opposite side of the mud flow earth body, the wave-approaching surface of the wave absorbing plate (13) is lower than the wave-escaping surface, and a plurality of wave absorbing holes (131) are formed in the wave-approaching surface and the arc surface of the wave absorbing plate (13).

Images