地铁隧道下穿施工必然会对地上结构产生不利影响，通过对上部结构的状态在线监测系统的设计和实践，以及基于云平台的预警体系建设，实时获得地铁施工对地上结构的影响规律，从而在施工工艺选择及其施工工艺参数设计等环节可最大限度地减小地铁施工对结构物的不利影响。观测数据表明： 在线监测系统提供的监测数据可实时准确地反映地铁施工对地上结构的影响，并指导地铁施工，以保证地上结构的安全。

The construction of Metro tunnels crossing underneath existing surface buildings (structures) inevitably causes adverse effect on the surface buildings (structures). The influence of the construction of Metro tunnels crossing underneath surface buildings (structures) has been minimized by choosing proper construction technologies and proper construction parameters on basis of monitoring data collected from the online monitoring system and the cloud service alarming system. The monitoring data show that the online monitoring system can accurately reflect the rules of the influence of the construction of Metro tunnels on the surface buildings (structures) and the safety of the surface buildings (structures) can be guaranteed.