高速鐵路路基下方盾構(gòu)管片受力分析
[Abstract]:Due to the rapid development of high-speed railway and urban track, there will inevitably be a large number of engineering examples of shield tunnel underpass railway. At present, the research on the intersection of high-speed railway and shield tunnel at home and abroad is mainly focused on the influence of tunnel on the upper high-speed railway during shield tunneling. It is rare to study the influence of high-speed railway on shield tunnel. Therefore, the influence of high-speed railway operation on the segment force of shield tunnel is studied in this paper. In this paper, the model of shield tunneling through high-speed railway is established by using ABAQUS software. The dynamic response of shield segments with different assembling modes is studied when high-speed train with different speeds passes directly above the shield tunnel with different buried depth. The following conclusions can be drawn: (1) on the whole, the maximum vertical acceleration caused by train vibration load decreases with the increase of buried depth on the surface of the segment. On the basis of the previous research, this paper analyzes and fits the numerical value of the train, and determines that the vertical acceleration caused by the train vibration load attenuates in the form of exponential function in the soil. The specific formula is YY 2.3e ^ (x / 1.61) where the buried depth x is the maximum vertical acceleration amplitude. (2) for the bolts inside the segment, the effect of the vibration load of the train must first be transmitted through the soil to the shield segment, and then the vibration energy will be transmitted inside the segment. Finally, the bolt part of the joint is reached, because the damping of concrete is smaller than that of soil. So the attenuation of vertical acceleration amplitude of segment joint bolt is slower than that of shield segment. (3) the vertical acceleration of segment increases with the increase of train speed. But the faster the speed is, the faster the dynamic stress of the train decays with the buried depth. Finally, when the buried depth is more than 13 m, the dynamic stress tends to be the same. (4) under the action of the vibration load of the train, The pressure on the segment decreases rapidly with the increase of the buried depth. In most regions of the segment, the equivalent stress generated by the dynamic load is less than 1 part of the equivalent stress generated by the static load, but only when the buried depth is less than 6 m. (5) the equivalent stress of the shield segment increases with the increase of the train speed, but the smaller part of the shield segment is affected greatly by the train load of 350km/h, the ratio of the two components in the top region of the segment is only 1. (5) the equivalent stress of the shield segment increases with the increase of the train speed, but the smaller part of the segment is affected greatly by the train load. The ratio of equivalent stress to static stress caused by dynamic load at the top of shield tunnel is close to 4. Therefore, the equivalent stress produced by the dynamic load has little effect on the shield segment.
【學(xué)位授予單位】:蘭州交通大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:U455.43
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