Model test device and method for impact effect of submarine landslide surge on anchor chain

Abstract

The application provides a submarine landslide surge wave impact effect model test device and test method, and the device comprises a landslide body, a baffle, a clamping groove, a sliding groove, a spring, a fixing column, a torpedo anchor, a tension sensor I, a tension sensor II, a vibrating block, an anchor chain, a platform, a soil layer, a box body and an industrial camera. The impact of the landslide body on water in the inclined sliding groove simulates the submarine landslide surge wave load; the impact effect of the submarine landslide surge wave on the anchor chain can be obtained by analyzing the motion track of each vibrating block on the anchor chain and the numerical value of the tension sensor; the two-way mechanical feedback of the anchor chain load to the torpedo anchor end and the platform end under the special motion form of the anchor chain can be further analyzed; the stability law of the platform end on the water surface can be analyzed by the motion law and stress characteristic of the platform end, and the motion mechanical feedback of the submarine landslide surge wave to the offshore platform system via the anchor chain can be determined.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mooring foundation devices, and particularly relates to a model test device and a test method for the impact effect of submarine landslide surge on an anchor chain. BACKGROUND

[0002] Submarine landslides directly affect the construction and operation of drilling platforms, submarine cables, wind power pile foundations and port terminals. Frequent or sudden submarine landslide geological disasters in offshore waters seriously affect the engineering construction of the offshore economic belt and restrict the overall promotion of China's maritime Silk Road. Submarine landslides have obvious particularity compared with land slides in terms of special occurrence environment, complex formation mechanism and unique failure mode, and have the characteristics of large landslide volume, long sliding distance and obvious "sliding water effect" during sliding. In recent years, with the vigorous promotion of China's marine engineering construction, engineering disasters induced by submarine landslides have become increasingly prominent. At present, the research on the impact effect of submarine landslide surge on anchor chains is very limited, and the kinematic feedback of submarine landslide surge on offshore platform systems is still in the qualitative analysis stage. Therefore, there is still a lot of research space for the impact effect model of submarine landslide surge on anchor chains.

[0003] It is found through retrieval that application No. 201810027064.9 "Test device and test method for simulating submarine landslide" provides a scheme for simulating submarine landslides, but this scheme only studies the transport mechanism of landslide soil after submarine landslides, without considering the impact of submarine landslide surge. Application No. 201910989448.3 "Test device and test method for simulating submarine landslide impact on structures" also provides a test device for simulating submarine landslide impact on structures and studies the impact and damage effects on structures. However, this scheme does not involve the impact effect and mechanical feedback of long-chain structures.

[0004] Therefore, the prior art does not consider the impact effect of submarine landslide surge on anchor chains, lacks analysis of the special motion form of anchor chains as long-chain structures in water and the bidirectional mechanical feedback to the torpedo anchor end and the platform end, and thus cannot analyze the kinematic feedback of submarine landslide surge on offshore platform systems via anchor chains. SUMMARY

[0005] The purpose of the present invention is to solve the shortcomings and defects of the existing technology, and to provide a model test device and test method for the impact effect of submarine landslide waves on anchor chains. By analyzing the motion trajectory of each vibration block on the anchor chain and the value of the tension sensor, the impact effect of submarine landslide waves on the anchor chain can be obtained, thereby analyzing the two-way mechanical feedback of the anchor chain load to the torpedo anchor end and the platform end under the special motion form of the anchor chain; the stability law of the platform end on the water surface is analyzed through the motion law and force characteristics of the platform end, and then the motion mechanical feedback of the submarine landslide wave on the marine platform system transmitted through the anchor chain is determined.

[0006] A model test device for the impact effect of submarine landslide surge on anchor chain includes a landslide body 1, a baffle 2, a slot 3, a slide 4, a spring 5, a fixing column 6, a torpedo anchor 7, a tension sensor I8, a tension sensor II9, a vibration block 10, an anchor chain 11, a platform 12, a soil layer 13, a box 14, and an industrial camera 15.

[0007] The chute 4 is fixed above the soil layer 13 by two fixing columns 6, and the inclination angle of the chute 4 is adjusted by changing the length of the two fixing columns 6;

[0008] The baffle 2 is directly inserted into the slot 3, and the position of the landslide body 1 before sliding is adjusted by changing the position of the baffle 2 inserted into the slot 3;

[0009] The landslide body 1 is placed on the chute 4, and its downward trend is restrained by the baffle 2 below;

[0010] The torpedo anchor 7 is pre-buried in the soil layer 13 at a set depth;

[0011] The torpedo anchor 7 and the platform 12 are connected by an anchor chain 11, on which 3 to 5 vibrating blocks 10 are fixed; a tension sensor I8 and a tension sensor II9 are respectively provided at both ends of the anchor chain 11 connecting the torpedo anchor 7 and the platform 12 to measure the tension exerted on the torpedo anchor 7 and the platform 12 during submarine landslide surges;

[0012] The box 14 is filled with water, the water level is lower than the top of the box 14, and the soil layer 13 is soaked by water and tends to be saturated;

[0013] The platform 12 floats on the water surface and is fixed in relative positions by two torpedo anchors 7 buried in the soil layer 13; two springs 5 ​​are set on both sides of the platform (12) to restrain its lateral swing;

[0014] The industrial camera 15 is arranged outside the box 14 and records the motion trajectory of the vibration block 10 and the platform 12 by continuously shooting;

[0015] The model test method for the impact effect of submarine landslide surge on anchor chain is connected with the above-mentioned model test device for the impact effect of submarine landslide surge on anchor chain. The specific steps are as follows:

[0016] ①Preparation of clay with water content of 10% ~ 30%, layered into the box 14, forming the soil layer 13, while the torpedo anchor 7 and fixed column 6 embedded in the soil layer 13 at a specified depth;

[0017] ②Test device assembly: the chute 4 is fixed above the soil layer 13 by 2 fixed columns 6, and the landslide body 1 is placed on the chute 4; the torpedo anchor 7 is connected with the platform 12 through the anchor chain 11, 3 ~ 5 vibration blocks 10 are fixed on the anchor chain 11, and the two ends of the anchor chain 11 connecting the torpedo anchor 7 and the platform 12 are respectively provided with tension sensor I 8 and tension sensor II 9; 2 springs 5 are arranged on both sides of the platform 12;

[0018] ③Water is injected into the soil box 14 until the soil 13 is saturated with water, and the water surface is lower than the top of the box 14, and the platform 12 floats on the water surface;

[0019] ④The transparent grid paper is pasted on the observation surface of the box, and the industrial camera 15 is used to record the initial positions of the vibration blocks 10 on the anchor chain and the platform 12;

[0020] ⑤The baffle 2 is pulled out of the clamping groove 3, the landslide body 1 slides down along the chute 4, the surge generated by the sliding impact the anchor chain 11, and the vibration blocks 10 on the anchor chain and the platform 12 produce corresponding repeated motion, and the motion trajectory is recorded by continuously recording the industrial camera 15; the values of the tension sensor I 8 and the tension sensor II 9 are measured synchronously;

[0021] ⑥A plurality of tests are repeated by sequentially changing the position of the baffle 2 inserted into the clamping groove 3, the inclination angle α of the chute 4, the distance L between the two torpedo anchors 7, the inclination angle β of the anchor chain 11, and the mass m of the platform 12, and the values of the tension sensor I 8 and the tension sensor II 9 and the motion trajectories of the platform 12 and the vibration blocks 10 are recorded respectively to determine the impact effect of the submarine landslide surge on the anchor chain and the motion mechanics feedback of the offshore platform system.

[0022] Further, by analyzing the motion trajectory of the vibration blocks 10 on the anchor chain, the special motion form of the anchor chain as a long chain structure under the action of the surge can be analyzed; based on the value change of the tension sensor I 8 and the tension sensor II 9, the tension load change law of the torpedo anchor end and the platform end is determined, so as to analyze the bidirectional mechanical feedback of the anchor chain load to the torpedo anchor end and the platform end under the special motion form of the anchor chain, and obtain the impact effect of the submarine landslide surge on the anchor chain.

[0023] Further, by analyzing the motion rule and stress characteristics of the platform end, the stability rule of the platform end on the water surface is analyzed, and further the motion mechanics feedback of the submarine landslide surge to the offshore platform system through the anchor chain is determined.

[0024] Beneficial effects

[0025] The application provides a device and a method for testing the impact effect model of submarine landslide surge on anchor chain, which comprises a landslide body 1, a baffle 2, a clamping groove 3, a sliding groove 4, a spring 5, a fixed column 6, a torpedo anchor 7, a tension sensor I 8, a tension sensor II 9, a vibrating block 10, an anchor chain 11, a platform 12, a soil layer 13, a box 14 and an industrial camera 15. The sliding groove is fixed above the soil layer by two fixed columns, and the inclination angle of the sliding groove is adjusted by changing the length of the two fixed columns. The landslide body is placed on the sliding groove, and the downward sliding trend of the landslide body is constrained by the baffle. The baffle is directly clamped into the clamping groove, and the position of the landslide body before sliding is adjusted by changing the position of the baffle inserted into the clamping groove. The torpedo anchor is embedded in the soil layer at a set depth. The torpedo anchor and the platform are connected by the anchor chain, and 3-5 vibrating blocks are fixed on the anchor chain. The two ends of the anchor chain connected with the torpedo anchor and the platform are respectively provided with the tension sensor I and the tension sensor II, so as to measure the tension of the torpedo anchor and the platform when the submarine landslide surge occurs. The box is filled with water, the water surface is lower than the top of the box, and the soil layer is saturated by water. The platform floats on the water surface and is fixed in the relative position by two torpedo anchors embedded in the soil layer. Two springs are arranged on the two sides of the platform to constrain the lateral swing. The industrial camera is arranged outside the box, and the motion trajectory of the vibrating block and the platform is recorded by continuous shooting.

[0026] The application has the following advantages:

[0027] ①The impact effect model of submarine landslide surge on anchor chain is adopted to skillfully simulate the visual process of the impact effect of submarine surge on anchor chain, and test data are provided for engineering design.

[0028] ②The special motion form of the anchor chain under the action of surge can be analyzed based on the motion trajectory of each vibrating block.

[0029] ③The bidirectional mechanical feedback of the anchor chain load to the torpedo anchor end and the platform end under the special motion form of the anchor chain can be analyzed based on the numerical feedback of the tension sensor.

[0030] ④The stability law of the platform end on the water surface can be analyzed based on the motion law and stress characteristics of the platform end, and then the motion mechanical feedback of the submarine landslide surge to the offshore platform system through the anchor chain is determined. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a device structure schematic view of the application.

[0032] Figure 2 It is a device structure top view of the application.

[0033] Label explanation: landslide 1, baffle 2, card slot 3, chute 4, spring 5, fixed column 6, torpedo anchor 7, tension sensor I 8, tension sensor II 9, vibration block 10, anchor chain 11, platform 12, soil layer 13, box 14, industrial camera 15. DETAILED DESCRIPTION

[0034] The application will be further described below in conjunction with the drawings and examples.

[0035] As shown in Figure 1 and Figure 2 The submarine landslide surge impact effect model test device, including landslide 1, baffle 2, card slot 3, chute 4, spring 5, fixed column 6, torpedo anchor 7, tension sensor I 8, tension sensor II 9, vibration block 10, anchor chain 11, platform 12, soil layer 13, box 14, industrial camera 15.

[0036] The chute 4 is fixed above the soil layer 13 by two fixed columns 6, and the inclination angle of the chute 4 is adjusted by changing the length of the two fixed columns 6;

[0037] The landslide 1 is placed on the chute 4, and the downward sliding trend is constrained by the baffle 2 below;

[0038] The baffle 2 is directly inserted into the card slot 3, and the position of the baffle 2 before sliding is adjusted by changing the position of the baffle 2 inserted into the card slot 3;

[0039] The torpedo anchor 7 is embedded in the soil layer 13 at a specified depth;

[0040] The torpedo anchor 7 is connected with the platform 12 through the anchor chain 11, and 3-5 vibration blocks 10 are fixed on the anchor chain 11; the two ends of the anchor chain 11 connecting the torpedo anchor 7 and the platform 12 are respectively provided with tension sensor I 8 and tension sensor II 9 to measure the tension of the torpedo anchor 7 and the platform 12 when the submarine landslide surge occurs;

[0041] The inside of the box 14 is filled with water, and the water surface is lower than the top of the box 14, and the soil layer 13 is saturated by water immersion;

[0042] The platform 12 floats on the water surface and is fixed in a relative position by two torpedo anchors 7 embedded in the soil layer 13; two springs 5 are arranged on both sides of the platform 12 to constrain its lateral swing;

[0043] The industrial camera 15 is arranged outside the box 14, and the motion trajectory of the vibration block 10 and the platform 12 is recorded by continuous video recording.

[0044] The submarine landslide surge impact effect model test method adopts the submarine landslide surge impact effect model test device as described above, and the specific steps are as follows:

[0045] ①Preparation of clay with water content of 10% to 30%, layered into the box 14, forming the soil layer 13, while the torpedo anchor 7 and fixed column 6 embedded in the soil layer 13 at a set depth;

[0046] ②Test device assembly: the chute 4 is fixed above the soil layer 13 by 2 fixed columns 6, and the landslide body 1 is placed on the chute 4; the torpedo anchor 7 is connected with the platform 12 through the anchor chain 11, 3-5 vibration blocks 10 are fixed on the anchor chain 11, and the two ends of the anchor chain 11 connecting the torpedo anchor 7 and the platform 12 are respectively provided with tension sensor I 8 and tension sensor II 9; 2 springs 5 are arranged on both sides of the platform 12;

[0047] ③Water is injected into the soil box 14 until the soil 13 is saturated with water, and the water surface is lower than the top of the box 14, and the platform 12 floats on the water surface;

[0048] ④The transparent grid paper is pasted on the observation surface of the box, and the industrial camera 15 is used to record the initial positions of the vibration blocks 10 on the anchor chain and the platform 12;

[0049] ⑤The baffle 2 is pulled out of the clamping groove 3, the landslide body 1 slides down along the chute 4, the surge generated by the landslide body 1 impacts the anchor chain 11, and the vibration blocks 10 on the anchor chain and the platform 12 produce corresponding repeated movements, and the industrial camera 15 continuously records the movement trajectories of the vibration blocks 10 and the platform 12; the values of the tension sensor I 8 and the tension sensor II 9 are measured synchronously;

[0050] ⑥A plurality of tests are repeated by sequentially changing the position of the baffle 2 inserted into the clamping groove 3, the inclination angle α of the chute 4, the distance L between the two torpedo anchors 7, the inclination angle β of the anchor chain 11, and the mass m of the platform 12, and the values of the tension sensor I 8 and the tension sensor II 9, and the movement trajectories of the platform 12 and the vibration blocks 10 are recorded respectively, to determine the impact effect of the submarine landslide surge on the anchor chain and the movement mechanics feedback of the offshore platform system.

[0051] The above only describes the preferred embodiments of the present application, and it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. A method for model testing of the impact effect of submarine landslide surge on anchor chain, characterized in that, The model test device for impact effect of submarine landslide surge on anchor chain is tested; the model test device comprises a landslide body (1), a baffle (2), a clamping groove (3), a sliding groove (4), a spring (5), a fixed column (6), a torpedo anchor (7), a tension sensor I (8), a tension sensor II (9), a vibrating block (10), an anchor chain (11), a platform (12), a soil layer (13), a box (14) and an industrial camera (15); the sliding groove (4) is fixed above the soil layer (13) by two fixed columns (6), and the inclination angle of the sliding groove (4) is adjusted by changing the length of the two fixed columns (6); the landslide body (1) is placed on the sliding groove (4), and the downward sliding trend of the landslide body (1) is constrained by the baffle (2) below; the baffle (2) is directly clamped into the clamping groove (3), and the position of the landslide body (1) before sliding is adjusted by changing the position of the baffle (2) inserted into the clamping groove (3); the torpedo anchor (7) is embedded in the soil layer (13) at a set depth; the torpedo anchor (7) and the platform (12) are connected by the anchor chain (11), and 3-5 vibrating blocks (10) are fixed on the anchor chain (11); the two ends of the anchor chain (11) connected with the torpedo anchor (7) and the platform (12) are respectively provided with the tension sensor I (8) and the tension sensor II (9) to measure the tension of the torpedo anchor (7) and the platform (12) when the submarine landslide surge occurs; the box (14) is filled with water, and the water surface is lower than the top of the box (14); the soil layer (13) is saturated by water immersion; the platform (12) floats on the water surface and is fixed in a relative position by two torpedo anchors (7) embedded in the soil layer (13); two springs (5) are arranged on the two sides of the platform (12) to constrain the lateral swing of the platform (12); the industrial camera (15) is arranged outside the box (14) and records the movement track of the vibrating block (10) and the platform (12) by continuous shooting; the test method comprises the following specific steps: ①Preparation of clay with a water content of 10%-30%, layered into the box (14) to form the soil layer (13), and the torpedo anchor (7) and the fixed column (6) are embedded in the soil layer (13) at a set depth; ②Assembly of the test device: the sliding groove (4) is fixed above the soil layer (13) by two fixed columns (6), and the landslide body (1) is placed on the sliding groove (4); the torpedo anchor (7) and the platform (12) are connected by the anchor chain (11), and 3-5 vibrating blocks (10) are fixed on the anchor chain (11); the two ends of the anchor chain (11) connected with the torpedo anchor (7) and the platform (12) are respectively provided with the tension sensor I (8) and the tension sensor II (9); two springs (5) are arranged on the two sides of the platform (12); ③Water is injected into the box (14) until the soil layer (13) is saturated by water immersion, and the water surface is lower than the top of the box (14); the platform (12) floats on the water surface; ④Transparent grid paper is pasted on the observation surface of the box, and the initial positions of the vibrating blocks (10) on the anchor chain and the platform (12) are recorded by the industrial camera (15). ⑤Pull the baffle (2) out of the slot (3), and the landslide (1) slides down along the chute (4), the surge impact on the anchor chain (11), each vibration block (10) and the platform (12) on the anchor chain corresponding to the repeated movement, through the industrial camera (15) to record its trajectory of motion by continuous video; ⑥Through changing the position of the baffle (2) inserted into the slot (3), the angle of inclination of the chute (4) α, the distance L between the two torpedo anchors (7), the angle of inclination of the anchor chain (11) β, the mass m of the platform (12), repeat steps ①-⑤ for multiple tests, and record the values of the tension sensor I (8) and the tension sensor II (9), as well as the trajectories of the platform (12) and each vibration block (10), to determine the impact effect of submarine landslide surge on the anchor chain and the kinematic feedback of the offshore platform system.

2. The method of claim 1, wherein, By analyzing the trajectories of each vibration block (10) on the anchor chain, the special motion pattern of the anchor chain as a long chain structure under the action of the surge can be analyzed; Based on the value changes of the tension sensor I (8) and the tension sensor II (9), the variation of the tensile load at the end of the torpedo anchor and the platform can be determined, and the two-way mechanical feedback of the anchor chain load to the end of the torpedo anchor and the platform under the special motion pattern of the anchor chain can be analyzed, and the impact effect of submarine landslide surge on the anchor chain can be obtained.

3. The method of claim 1, wherein, By analyzing the motion law and force characteristics of the platform end, the stability law of the platform end on the water surface can be analyzed, and the kinematic feedback of the submarine landslide surge to the offshore platform system through the anchor chain can be determined.

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