顶管施工对紧邻隧道的附加影响研究  

Study of Additional Impact on the Adjacent Tunnel Induced by Pipe Jacking Construction

作　　者：刘映晶[1] 

机构地区：[1]上海市隧道工程轨道交通设计研究院,上海市200240

出　　处：《公路》2016年第8期233-239,共7页Highway

摘　　要：采用有限单元法模拟间距为5m的两个平行顶管隧道的施工,结合实测数据分析新建顶管隧道对已建隧道的附加影响;并在此基础上计算该区域内较小间距下（3m和2m）隧道附加位移和附加内力的变化情况。研究结果表明,该区域新建隧道对间距2~5m的已建隧道的附加位移影响很小,在2mm以内。计算得出,在2~5 m间距内竖向附加位移随着间距的增大而提高,水平附加位移随着间距的增加而降低。隧道结构的最大附加轴力和最大附加弯矩均随着间距的增大而降低。在间距小于3.5m的情况下,隧道结构的轴力和负弯矩的附加值均较为明显。FEM is adopted to simulate a parallel pipe-jacking tunnels with 5 m distance between each other, and combined with the field measurement data, additional impact on the constructed tunnel is analyzed. Base on this, variations of additional displacement and additional internal force for two smaller distances （3 m and 2 m） between the tunnels in that region are calculated. The result shows that additional displacement impact on the constructed tunnel 2 m to 5 m away from the new constructing tunnel is minor, within 2 ram. Vertical additional displacement increases along with the increase of distance between tunnels from 2 m to 5 m, but horizontal additional displacement decreases. Maximum additional axial force and maximum additional bending moment of tunnel structure decrease as well as the distance increase from 2 m to 5 m. When the distance is less than 3.5 m between the two tunnels, the maximum additional axial force and maximum additional negative bending moment are significant.

关 键 词：顶管隧道 临近隧道结构 附加位移 附加内力 有限单元法 

分 类 号：U455.49[建筑科学—桥梁与隧道工程]