River-crossing water supply pipeline tunnel underwater vibration noise prediction method

Abstract

The invention discloses a river-crossing water supply pipeline tunnel underwater vibration noise prediction method which specifically comprises the following steps: firstly, establishing finite element models of a three-dimensional water supply pipeline tunnel structure and a soil body structure; then, establishing a fluid finite element model, and setting a boundary of a soil body structure; secondly, based on a fluid-solid coupling vibration model composed of a fluid finite element model and a structure finite element model, performing fluid-solid coupling vibration analysis by considering the influence of the initial fluid flow velocity, and obtaining the vibration response of the structure; then, establishing a fluid-solid coupling acoustic finite element model, and importing a fluid-induced soil body vibration response result into the acoustic model to serve as a boundary condition; and finally, solving noises caused by vibration of the underwater pipeline tunnel through an acoustic finite element and an automatic matching layer method. The method can be used for predicting the underwater vibration noise of the river-crossing water supply pipeline tunnel, the noise space attenuation rule is obtained, and a theoretical basis is provided for reducing the influence of the underwater noise.

Description

technical field [0001] The invention relates to a technology for predicting underwater vibration and noise of a water supply pipeline tunnel crossing a river, and belongs to the technical field of transportation. Background technique [0002] With the development of economy and the increase of population, the safety of urban water supply is becoming more and more important. In order to improve the safety and service life of water supply pipelines, a large number of tunnel structures for water supply pipelines across the river have been built. The water flow flowing in the pipeline in the water supply pipeline will cause the vibration of the pipeline structure, and then the transmission through the support and pier will cause the transmission of the tunnel structure. The vibration of the tunnel structure will cause the vibration of the overlying soil layer, and then generate underwater radiation noise. Long-term vibration and noise will affect the ecology of underwater organi...

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Problems solved by technology

At present, there is no effective method to evaluate the underwater noise caused by the water supply pipeline tunnel across the river. Simplified line sound source and point sound source models are often used, and the influence of fluid-structure interaction is not accurately considered; in addition, for projects to be built Therefore, it is necessary to develop an underwater vibration and noise prediction method for water supply pipeline tunnels across the river to accurately obtain the spatial distribution of noise and provide a theory for the protection of underwater biodiversity. Base

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