軌道交通引起的振動在成層土中的傳播規(guī)律
[Abstract]:With the rapid development of rail transit, especially rail lines covering urban areas more and more, the noise and vibration produced by ground rail transit have an important impact on the surrounding environment. On the one hand, noise and vibration to a certain level will interfere with people's daily life, and even affect people's emotions, sleep, rest and learning; on the other hand, vibration will also lead to liquefaction of the foundation, foundation sinking or uneven sinking. Cracks in the wall, inclining or even partial damage to buildings, especially to buildings with precision instruments, hospitals, laboratories, etc., which are particularly sensitive to vibration, will cause incalculable losses. Therefore, environmental vibration caused by rail transit has been paid more and more attention. In this paper, the current situation of research at home and abroad is summarized, and the research results and current situation of environmental vibration caused by rail transit are systematically expounded. The three-dimensional finite element model of train, track and subgrade is established by ANSYS, and the transient analysis is carried out. The dynamic interaction between railway track and foundation is considered from different angles under the impact load brought by rail transit. The attenuation law and vibration level evaluation of ground vibration caused by train operation are given. The results can provide a theoretical basis for the design and application of vibration isolation in urban rail transit engineering. The main research contents and results are as follows: (1) the 3D model of train-track subgrade is established by ANSYS finite element software to simulate the extension section of Shanghai Metro Line 2 Airport. The artificial viscoelastic boundary is adopted, the load is loaded by exciting force, and the model is calculated by half of the whole model. The calculation time is saved and the calculation efficiency is improved. The actual vibration of the Yanchang section of Shanghai Metro Line 2 Airport is simulated accurately. (2) in order to clarify the influence of track structure and foundation characteristics on the vibration and wave propagation characteristics of the ground caused by train traffic load, The variation law of vertical vibration acceleration and the evaluation of vibration level under different vibration directions, different measuring points and different speeds are investigated through different angles. In addition, the variation law of vibration frequency is summarized. (3) the gap (isolation ditch) and vibration isolation continuous wall are compared. The vibration isolation effect of three kinds of vibration isolation measures is compared, and the dynamic response of 3D foundation surface without or with different vibration isolation measures is demonstrated by contrast method. The application scope of three kinds of vibration isolation measures is briefly explained. The depth, width, thickness and the number of piles are analyzed and evaluated.
【學位授予單位】:沈陽建筑大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:U211.3;TU43
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