地鐵隧道環(huán)境振動(dòng)三維頻域算法及其參數(shù)敏感性分析
[Abstract]:With the development of economy, the city scale is expanding, the city population is increasing rapidly, the city is congested, the traffic jam, the noise air pollution and so on. Subway with its unique advantages, such as the use of electric power to reduce air pollution; passenger capacity is far larger than cars, saving energy; more special road rights, safe and convenient, play a unique role in alleviating urban traffic problems. However, as the planning of subway lines becomes more intensive, subway lines will inevitably pass through the sensitive points of urban vibration. In order to control the vibration of subway environment and meet the needs of urban life, a large number of vibration reduction measures are adopted. Nevertheless, due to the lack of basic research on the traffic environment vibration standard system in China, the current prediction methods are too old. After the new line was opened and operated for a period of time, residents in the vicinity of the subway line complained about the environmental vibration caused by the subway. At present, the analytical method is based on a large number of simplification and assumptions, and can be used for the theoretical research of subway environmental vibration. If it is used in engineering practice, it is lack of practicability. Empirical value method is based on a large number of experiments to establish a prediction method, which has certain practicability and accuracy, but lacks applicability and high cost. With the rapid development of computer technology, numerical method has become the main research direction. Compared with the simplified model of analytical method and the cost applicability of empirical value method, numerical method can be used to establish complex models close to the actual situation, including complex terrain, multi-class buildings and complex operating conditions, and so on. In order to ensure the accuracy of the calculation, a complex model is established, but the computational cost (time) of the numerical method will increase rapidly. How to consider the accuracy and efficiency of the numerical method at the same time is the key point of the numerical method. Because the research on the key parameters of the prediction model is not deep enough at present, this paper focuses on the key parameters on the basis of the fast prediction algorithm, the purpose of which is to consider the key parameters in the process of establishing the prediction model in the future. The non-key parameters are simplified to improve the calculation efficiency under the premise of ensuring the calculation accuracy. Therefore, this paper has done the following research on the key parameters of the prediction model: (1) collecting the existing problems and research status of subway environmental vibration at home and abroad, sorting out the domestic and foreign standards of subway environmental vibration. Three main prediction methods of subway environmental vibration are summarized and the corresponding advantages and disadvantages are analyzed. (2) the environmental vibration test of subway tunnel is carried out. The environmental vibration of subway tunnel in a certain district of Chengdu Metro Line 2 is analyzed in this paper. (3) the three-dimensional frequency domain algorithm of environmental vibration of subway tunnel is established. It includes the frequency domain analysis model of vehicle-track vertical coupling and the 3D finite element frequency domain prediction model of subway tunnel. (4) the key parameters affecting the accuracy of the prediction model are studied, and the frequency variation of the stiffness and damping of the rubber pad of the track system is analyzed. The influence of the geometric parameters of the soil layer model (i.e. the direction of the road along the thickness of the soil layer) and the physical parameters (elastic modulus of the soil layer) on the three-dimensional frequency domain algorithm of the environmental vibration of the subway tunnel is discussed. (5) based on the environmental vibration of the subway tunnel The 3D frequency domain algorithm is used to visualize the environmental vibration of subway tunnel. Draw vibration map, visual display of environmental vibration along the subway.
【學(xué)位授予單位】:西南交通大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:U451.3
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