Road river-crossing tunnel underwater vibration noise prediction method

Abstract

The invention discloses a road river-crossing tunnel underwater vibration noise prediction method, and the method specifically comprises the following steps: firstly, obtaining traffic flow distribution of different working conditions according to the traffic flow statistics, and building a random vehicle model of each lane; then, establishing a fine three-dimensional tunnel structure-soil body finite element model, and simulating infinite domain boundary conditions of a soil layer; secondly, on the basis of a vehicle-tunnel-soil body coupling vibration model, carrying out vehicle-induced tunnel-soil body dynamic response analysis by considering influence of initial water pressure; then, establishing a water-soil fluid-solid coupling acoustic finite element model, and converting a vehicle-induced soil vibration response result to a frequency domain through Fourier transform and mapping the result to a fluid and soil coupling surface to serve as a vibration source of an acoustic model;and finally, solving underwater noise caused by tunnel vibration through an acoustic finite element-complete matching layer method. The method can be used for accurately predicting the underwater vibration noise of the road river-crossing tunnel, and a theoretical basis is provided for evaluating the noise influence of endangered underwater organisms.

Description

technical field [0001] The invention relates to a technology for predicting underwater vibration and noise of highway crossing river tunnels, belonging to the technical field of transportation. Background technique [0002] With the development of the city and the growth of transportation demand, more and more tunnels across the river are being built and planned. During the operation of the speed adjustment, the moving vehicles will cause the tunnel structure to vibrate, and the transmission of the structural vibration through the soil will generate large underwater radiated noise. The underwater noise generated by wading projects has caused great harm to underwater organisms, especially endangered species. Take the Yangtze finless porpoise as an example. It is listed as "critically endangered" by the International Union for Conservation of Nature. One of the reasons for its sharp decline is the vibration and noise pollution caused by wading projects. In addition, many riv...

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Problems solved by technology

[0003] The impact of underwater vibration and noise of cross-river tunnels on endangered species has attracted great attention from relevant departments, experts and scholars. Reports on the research on underwater vibration and noise of tunnels, because the underwater noise test is easily interfered by other sound sources such as ships, and the simplified theoretical formula cannot accurately simulate the vibration and noise caused by random traffic flow, the underwater vibration and noise characteristics, radiation The mechanism and scope of influence are not clear, and it is urgent to develop an efficient prediction method for underwater vibration and noise of cross-river tunnels to reveal its acoustic radiation mechanism, and analyze the impact of underwater noise on its ecological environment in combination with the hearing threshold of endangered species. The ecological environment of endangered species provides strong technical support

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