论文部分内容阅读
以一个浅埋暗挖地铁车站为背景,应用地下结构静-动力分析方法,首先采用有限元荷载释放法模拟该地铁车站施工过程,然后采用动力有限元分析了该地下结构在地震荷载作用下的动力响应。分析结果表明,浅埋地铁车站采用先拱后墙法施工时,上台阶左侧(即先开挖一侧)大拱脚处的初衬区域应力较大;在地震荷载作用下,浅埋地铁车站结构内轮廓位移、速度和加速度动力响应峰值最大值出现在直墙顶端或附近区域,第一主应力峰值最大值与第三主应力峰值最小值分别出现在拱腰区域与右直墙底部。地铁车站结构静力和动力分析中高应力区出现在不同部位,其抗震设计中应分别对这些部位进行加强。
Taking a shallow burial subway station as a background, the underground structure static-dynamic analysis method is used to simulate the construction process of the subway station firstly. Then the dynamic finite element method is used to analyze the effect of the underground structure under the earthquake load Dynamic response. The results show that when the shallow subway station is constructed with the first arch and the back wall method, the stress in the primary lining of the large arch foot on the left side of the upper step (ie the side of excavation first) is larger. Under the earthquake load, The maximum peak value of the dynamic response of the contour, the velocity and the acceleration in the station structure appears at the top or near the straight wall. The maximum of the first principal stress peak and the minimum of the third principal stress peak appear at the bottom of the arch waist area and the right straight wall, respectively. In metro stations, static stress and dynamic analysis of high-stress areas appear in different parts of the earthquake-resistant design should be strengthened for each of these parts.