组合荷载作用下地铁隧道结构动力稳定性分析

发布时间：2018-06-07 00:53

本文选题：区间隧道 + 列车荷载　；参考：《大连交通大学》2014年硕士论文

【摘要】：近年来,随着我国城市的不断发展,人口的迅速增加,城市交通拥挤、效率低下已经成为阻碍城市发展的主要因素之一。而地铁不仅可以缓解城市交通压力、提高城市交通效率,还节约了大量土地。一直被认为具有良好的抗震性能的地铁隧道是由于受到了周围岩体的约束,但是随着隧道数量的增多及隧道和地下管道震害的频繁出现,隧道安全问题日益受到世界各国地震工作者的高度重视。我国地处环太平洋地震带与欧亚地震带之间,抗震设防烈度在7度以上的城市占全国城市的近一半左右,在现在地铁高速建设时期,对隧道安全性能的研究是必不可少的。本文在前人的工作基础上,总结了地铁隧道震害机理及其震动特点,对现有的抗震设计理论方法进行了概述。针对地铁隧道荷载进行了分析,总结隧道可能受到的荷载影响并给出最不利荷载组合,对大连地铁2号线二期工程的区间隧道进行了荷载组合的静力计算,得出其受力最不利截面。通过对在列车振动荷载作用下地铁隧道的动力有限元仿真计算得出,得出地铁列车振动荷载对隧道影响较小,隧道的安全主要由静力荷载决定,但是在列车振动荷载作用影响下会使衬砌混凝土的刚度下降,从而影响隧道安全。由于大连地区是地震多发地区,其地震震源浅,但是震级小,针对频发低烈度地震及抗震设防烈度地震对区间隧道的影响进行了动力响应分析。结果表明,地铁隧道的安全主要是受静力荷载即土层压力及自重决定,但是列车荷载及频发低烈度地震会对隧道衬砌的刚度造成影响,在循环加载过程中会使其刚度逐渐下降,对隧道安全产生影响。
[Abstract]:In recent years, with the continuous development of cities and the rapid increase of population, urban traffic congestion and inefficiency have become one of the main factors hindering the development of cities. Subway can not only relieve urban traffic pressure, improve urban traffic efficiency, but also save a lot of land. The subway tunnel, which has been considered as having good seismic performance, is restricted by surrounding rock mass. However, with the increase of the number of tunnels and the frequent occurrence of earthquake damage of tunnels and underground pipelines, Tunnel safety has been paid more and more attention by seismologists all over the world. China is located between the Pacific Rim seismic belt and the Eurasian seismic belt. The cities with seismic fortification intensity above 7 degrees account for nearly half of the cities in China. In the period of subway high-speed construction, it is necessary to study the safety performance of the tunnel. In this paper, based on the previous work, the earthquake damage mechanism and vibration characteristics of subway tunnel are summarized, and the existing seismic design theory and methods are summarized. Based on the analysis of the load of the subway tunnel, the influence of the load on the tunnel is summarized and the most unfavorable load combination is given, and the static calculation of the load combination is carried out for the section tunnel of Dalian Metro Line 2. The most unfavorable section of the force is obtained. Through the finite element simulation of the subway tunnel under the train vibration load, it is concluded that the subway train vibration load has little influence on the tunnel, and the safety of the tunnel is mainly determined by the static load. However, under the influence of train vibration load, the stiffness of lining concrete will decrease, thus affecting the tunnel safety. Because Dalian is an earthquake-prone area with shallow earthquake source but small magnitude, the dynamic response of the interval tunnel caused by frequent low-intensity earthquakes and seismic fortification earthquakes is analyzed. The results show that the safety of subway tunnel is mainly determined by static load, that is, soil pressure and deadweight, but train load and frequent low-intensity earthquakes will affect the stiffness of tunnel lining, and the stiffness will decrease gradually during cyclic loading. Impact on tunnel safety.
【学位授予单位】：大连交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U452;U231.1

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