高速列车荷载作用下立体交叉隧道结构抗减振措施研究

发布时间：2018-05-05 10:30

  本文选题：高速列车 + 立体交叉隧道　； 参考：《中南大学》2014年硕士论文

【摘要】：摘要：随着我国高速铁路建设的快速发展,必然会出现越来越多的高速列车隧道立体交叉的情形。高速铁路列车速度的提高,列车荷载对隧道结构的冲击更大,高速列车荷载作用下立体交叉隧道结构振动影响问题日益突出。本文针对高速列车荷载作用下的立体交叉隧道结构抗减振问题,依托高速铁路基础研究联合基金项目(U1134208),采用数值计算方法,系统研究了增加衬砌厚度、加固围岩、减振层三种抗减振措施对高速列车荷载作用下立体交叉隧道结构的抗减振效果。主要研究内容与成果如下： (1)针对隧道-围岩体系振动特性,高速列车荷载谱、高速铁路立体交叉隧道结构的特点和采用的抗减振措施,对数值计算模型进行了对比工况的设计与建立。 (2)从中间岩柱应力、衬砌结构位移、加速度、应力几方面对不同衬砌厚度下立体交叉隧道结构振动特性进行了分析,得出一定范围内增加衬砌厚度能够对立体交叉隧道结构起到一定的抗减振作用,推荐采用衬砌厚度为60cm。 (3)从中间岩柱应力、衬砌结构位移、加速度、应力几方面分析了隧道支护结构外围3m进行围岩加固对立体交叉隧道结构抗减振效果的影响,得出加固围岩对Ⅳ、Ⅴ级围岩能够起到有效的抗减振作用,对Ⅲ级围岩不能起到显著的抗减振作用。 (4)分析了设置不同减振层厚度(5cm、10cm、20cm)与无减振层时立体交叉隧道结构振动特性的改变,得出不同减振层厚度对高速列车荷载作用下立体交叉隧道结构的抗减振作用,表明加设减振层可以起到一定的抗减振作用,推荐采用减振层厚度为10cm。
[Abstract]:Absrtact: with the rapid development of high-speed railway construction in China, more and more high-speed train tunnels will be intersected. With the increase of the speed of high-speed railway train, the impact of train load on tunnel structure is more and more serious, and the vibration problem of cross-tunnel structure under high-speed train load is becoming more and more serious. In this paper, in view of the anti-vibration problem of the cross-sectional tunnel structure under the high speed train load, relying on the high speed railway foundation research fund project U1134208, this paper systematically studies increasing the lining thickness and strengthening the surrounding rock by using the numerical calculation method. The effect of three kinds of anti-vibration measures on the anti-vibration of the cross-sectional tunnel structure under the load of high-speed train. The main research contents and results are as follows: 1) aiming at the vibration characteristics of the tunnel surrounding rock system, the load spectrum of high-speed train, the characteristics of the structure of the high speed railway cross tunnel and the anti-vibration measures adopted, the design and establishment of the numerical calculation model are carried out in comparison with the working conditions. In this paper, the vibration characteristics of cross tunnel structure with different lining thickness are analyzed from the stress of intermediate rock column, displacement of lining structure, acceleration and stress. It is concluded that increasing the thickness of lining in a certain range can have a certain anti-vibration effect on the cross-sectional tunnel structure, and the thickness of lining is recommended to be 60 cm. 3) from the stress of intermediate rock column, displacement of lining structure, acceleration and stress, this paper analyzes the influence of surrounding rock reinforcement of 3 m surrounding rock on anti-vibration effect of cross-tunnel structure, and draws the conclusion that strengthening surrounding rock is effective to 鈪，

本文编号：1847344