砂卵石地层城市地铁修建对既有建筑物影响分析

Analysis of the Impact of Urban Subway Construction on Existing Buildings in Sandy Cobble Stratum

为研究砂卵地层城市地铁施工对既有建筑物的影响,以洛阳市轨道交通1号线丽景门车站及丽景门站—青年宫站区间下穿既有地标建筑物九龙鼎为工程依托,利用有限元软件并结合工程实际分析基坑开挖、盾构隧道下穿施工对九龙鼎及地表的影响。研究表明,基坑施作过程中,随着基坑开挖深度的增加,纵横向监测断面各监测点变形逐渐增大;双线隧道开挖且开挖断面距横向监测断面-21~15m时,横向监测断面上各监测点变形对开挖断面变化响应显著;双线隧道贯通时,盾构施工沉降槽大致分布在双线隧道中心线-24~24m,且为主要沉降区域。

To study the impact of urban subway construction on existing buildings in sandy cobble stratum, based on Luoyang Rail Transit line 1, Lijingmen Station and Lijingmen Station-Qingniangong Station interval underpass the existing landmark building Jiulongding as the engineering support, using finite element software combined with the actual engineering to analyze the impact of foundation excavation and shield tunnel underpass construction on the existing building Jiulongding and the ground surface. The research shows that during the construction of the foundation excavation, the deformation of every monitoring point of the vertical and horizontal monitoring section gradually increases with the increase of the excavation depth of the foundation excavation. When the double-track tunnel is excavated and the excavation section is-21~15 m away from the lateral monitoring section, the deformation of every monitoring point on the lateral monitoring section responds significantly to the change of the excavation section.When the double-track tunnel is through, the shield construction settlement trough is roughly distributed in the center line of the double-track tunnel-24~24 m, and it is the main settlement area.