明挖区间隧道施工对临近明挖高铁隧道影响的研究

Study on Influence of Open-Cut Tunnel Construction on Adjacent Open-Cut High-Speed Railway Tunnel

新建轨道交通隧道与既有高铁隧道平行,水平间距较小,隧道采用明挖施工,基坑支护采取灌注桩围护加钢支撑,以施工方法及现场监测数据为依据,通过MIDASNX有限元软件,分析在轨道交通区间隧道采用明挖施工的情况下,基坑开挖过程中既有高铁隧道结构和基坑支护变形的发展规律。得到结论:基坑开挖过程对高铁隧道结构的影响主要集中在靠近基坑一侧边墙,且变形符合要求,基坑支护结构变形主要集中在基坑底部及其两侧;对于临近既有高铁隧道的明挖轨道交通隧道施工,采用灌注桩围护加钢支撑支护有效控制对临近既有高铁隧道结构的影响,保证施工安全。

The new rail transit tunnel is parallel to the existing high-speed railway tunnel, the horizontal spacing is small, the tunnel is used for open excavation construction, and the foundation pit support is supported by cast-in-place piles and steel support. Based on the construction method and on-site monitoring data, MIDAS NX is adopted. The finite element software analyzes the development law of high-speed railway tunnel structure and foundation pit support deformation in the excavation process of the tunnel. It is concluded that the influence of foundation excavation process on the structure of high-speed railway tunnel is mainly concentrated on the side wall near one side of the foundation pit, and the deformation meets the requirements. The deformation of the foundation pit support structure is mainly concentrated on the bottom of the foundation pit and its two sides;for the construction of open-cut rail transit tunnels with highspeed railway tunnels, the effect of effective control on the structure of existing high-speed railway tunnels is ensured by the support of cast-in-place piles and steel support to ensure construction safety.