摘要
华唐立交工程是重庆市江北区城市道路的重要工程,该工程用下穿地通道穿越建新南路。下穿地通道为明挖法施工,部分区段位于已建成轨道三号线华新街—观音桥区间隧道上方,地通道路面与隧道洞顶最近距离仅1.5m。为了确保下穿道施工不影响轨道三号线区间隧道的安全,本文用三维弹塑性有限元方法,对华唐立交下穿道的施工进行有限元仿真模拟,预测施工过程中区间隧道的变形和内力变化。计算结果表明,下穿道施工对轨道三号线区间隧道的影响主要为纵向变形,现有的隧道结构设计能抵抗纵向变形产生的附加内力。华唐立交修建完成后,区间隧道内力满足承载力要求和抗裂要求。这一结论为该工程的顺利实施提供了依据。
With the underpass road crossing Jianxin South Road,Huatang Overpass Project is an important project in the urban road construction in Jiangbei District,Chongqing.The underpass road of this project will be constructed with the open-cut method,part of which is over the tunnel of No.3 Railway Line from Huaxin Street to Guanyin Qiao that has already been completed,and the closet distance between the road and the tunnel roof is only 1.5m.In order to make sure that the construction of the underpass road will not threat the safety of the tunnel of No.3 railway Line,this paper makes FEM simulation of the construction of the underpass road of Huatang Overpass and predicts the deformation and the changes of internal forces of the tunnel during the construction by using the Three-dimensional elastoplastic finite element method.Based on the results of calculation,the major influence on the No.3 Railway Line tunnel is vertical variability which will produce additional internal forces,which the present design of the tunnel structure can resist and obsorb.After the construction of Huatang Overpass,the internal forces will meet the demands of capacity and crack.This conclusion provides evidence for the smooth construction of the project.
出处
《重庆建筑》
2011年第2期10-14,共5页
Chongqing Architecture
关键词
隧道
有限元分析
设计方案
tunnel
finite element analysis
design
