某桥梁基础施工引起下卧隧道变形的规律研究

针对某桥梁基础施工中基坑开挖对下卧运营地铁隧道的保护问题,基于工程实测数据,对隧道回弹隆起规律进行了分析,得出了坑底以下隧道的回弹变形受基坑开挖方式与基坑放置时间的影响,以及隧道的最大回弹隆起值与基坑放置时间、开挖方式之间的具体关系,在考虑基坑开挖时空效应的基础上,推导了适合工程预测应用的坑底隆起计算公式.

Research on laws for deformation of underlying tunnels of foundation construction of some bridge

Aiming at the protection problems of the excavation of foundation pit for the underlying operating metro tunnels in the foundation construetion of some bridge, the paper has the analysis of the resilience upheaval law based on the engineering observed data, concludes the influence of the excavation ways of the foundation pits and the standing time of the foundation pits on the resilience deformation of the tunnels below the pit bottom, as well as the relationship among the maximum resilience upheaval value of the tunnel, the standing time of foundation pit and the excavation ways, and concludes the upheaval calculation formula of the pit bottom for the engineering forecasting application based on the timespace effect of the excavation of foundation pits.