Suspension tunnel dynamic response test device and method under coupling of earthquake and wave flow

Abstract

The invention discloses a suspension tunnel dynamic response test device and method under the coupling of an earthquake and a wave flow. The test device comprises a test water tank and a sensing and measuring device; and a wave and flow making device, an earthquake simulation vibrating table and a restraining device for restraining the motion of a test tube are arranged in the test water tank. Thetest method is realized through the steps of mounting a wave height meter and a flow meter in the test water tank, and carrying out wave flow sequence check and wave elimination treatment on the waveflow; connecting the test tube with the earthquake simulation vibrating table, and mounting a gyro sensor, a GPS-RTK combined measuring device, a tension sensor and a pressure sensor; carrying out wave and flow making by using the wave and flow making device, and after the wave flow is stabilized, starting the earthquake simulation vibrating table; and measuring various dynamic indexes of the test tube, and dynamically acquiring the data through a data acquisition unit. The device and method are capable of truly and effectively simulating the structural three-dimensional motion and stress conditions of the underwater suspension tunnels under the load action of the wave flow, the earthquake and the like.

Description

technical field [0001] The invention relates to the technical fields of marine engineering and bridge tunnel engineering, in particular to a dynamic response test device and method of a floating tunnel under the coupling action of earthquake and wave current. Background technique [0002] The floating tunnel (Submerged Floating Tunnel, referred to as SFT) and its anchor cables have been in the marine environment for a long time, and the wave and current loads are the most important environmental loads it suffers. For the action of wave and current loads, there are already many numerical simulation calculation theories and methods such as diffraction theory, Froude-Krylov theory, and Morison equation. However, the current numerical simulation calculation theory and methods adopt assumptions and simplifications for the convenience of calculation. For example, the fluid-solid coupling between the tunnel and the fluid is not considered, the water flow is assumed to be an ideal f...

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Problems solved by technology

[0004] Experimental and numerical analysis of submerged floating tunnel, J.Cent.South Univ. (2012) 19: 2949-2957, discloses a floating tunnel test device under the action of marine earthquakes, but the test device has the following deficiencies: (1) Unable to create wave flow, etc., only considering the impact of earthquake underwater on water flow, unable to simulate the coupling effect of earthquake and wave; (2) Without considering the constraints at both ends of the pipe body, it is impossible to simulate the impact of rock mass anchorage on the adjacent pipe section and revetment section on the tunnel The function of the test pipe body; (3) without wave elimination treatment, disturbances such as wave reflection and refraction will affect the pipe body and affect the measurement accuracy; (4) the acceleration sensor is used for measurement, the measurement accuracy is low, and it cannot accurately reflect the pipe body. Underwater attitude; (5) The test assumptions are not considered, and the cable angle, length, cable force, etc. cannot be flexibly adjusted; (6) Only the acceleration in the heave direction and the sway direction can be measured, and it is not possible to measure free forces such as surge and roll. High degree of motion response, unable to fully reflect the underwater posture of the pipe body in a complex ocean environment

[0006] The underwater multi-point excitation pseudo-dynamic test system (this patent authorization announcement number: CN 103868669A) has the advantages of being able to meet the size requirements of large-scale structural models, multi-point multi-dimensional input of earthquake input, and reproduction of earthquake motion and structural response. It can consider the wave and current environment in which the floating tunnel is located, and does not simulate the impact of the seabed plate vibration on the water body

[0007] The overall impact response test device of the floating tunnel (the patent authorization announcement number: CN 203881508U) has the advantages of simple and intuitive model, low cost, and increased consideration of constraint simulation, but only considers one-dimensional load and dynamic response, and cannot comprehensively analyze other dimensions Case

[0008] The floating tunnel test system under the action of ocean waves (this test model is taken from: Simplified analysis for estimation of the behavior of a submerged floating tunnel in waves and experimental verification, Marine Structures, 2015-12-15) is simple and intuitive, with controllable parameters and high precision High and suitable for small-scale models, etc., but in the case of only a single-section model, the effect of the rock mass anchorage of adjacent pipe sections and revetment sections on the test tunnel pipe body is not considered, and the water body near the floating tunnel is not wave-absorbing treatment

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