关键词: 古建筑; 盾构掘进; 监测分析; 气压辅助开仓; 施工控制; 清晖园;

Abstract: Shield tunneling crossing buildings would cause disturbance to produce a series of adverse effects.For historic ancient buildings,the entire process needs to be more strictly controlled.In order to reduce the influence of shield tunneling crossing the Qinghui Garden,it is necessary to conduct real-time monitoring and feedback guidance of the garden under different shield tunneling working conditions to ensure its safety.The measured and statistical analysis results showed that a large amount of groundwater at the excavation face would cause significant settlement of surrounding buildings.The air pressure-assisted opening shield would cause the imbalance of excavation face pressure,which led to the uplift or settlement of buildings.Reasonable tunneling parameters could control the building settlement in a small range.The settlement of buildings under the influence of shield tunneling could be roughly divided into five stages.For controlling settlement of points that were easy to settle,it was suggest to speed the tunneling to let the shield tail reach these points to conduct synchronous grouting and secondary grouting.Through the whole process monitoring and statistical feedback,the shield successfully crossed the left line of the Qinghui Garden,and the relevant experience can be used for reference of the similar projects.

Key words: ancient building; shield tunneling; monitoring analysis; air pressure-assisted opening shield; construction control; Qinghui Garden;