顶管施工引起古建筑地表沉降分析

Analysis of Historic Building Settlements Induced by Pipe Jacking Construction

为了对玉皇阁基础托换时提供参考,对顶管施工时玉皇阁阁体沉降进行了监测。在阁体的每面墙体上设置了七个测点,在施工期间每天定时进行沉降观测,得到了顶管施工过程中阁体沉降数据。由沉降数据可以看出,影响阁体沉降的主要因素为:(1)土体开挖引起应力释放;(2)纠偏引起的超挖;(3)摩擦力引起的箱梁周围空隙;(4)土体扰动后固结。并对此提出了合理的建议,为类似顶管工程提供参考。

To provide reference of foundation underpinning of Yu Huang pavilion,the settlements of Yu Huang pavilion are monitored in the pipe jacking construction period.7 monitoring points were arranged on each wall of Yu Huang pavilion,the settlements were observed at a fix time everyday,and the settlements of Yu Huang pavilion were obtained in the pipe jacking construction period.From the data,it can be seen that the following main factors that affect the settlements of Yu Huang pavilion are given：（1）stress release for soil excavation;（2）over excavation to rectification;（3） void around box girder due to friction;（4） soil consolidation after being disturbed.Proper suggestions are put forward in accordance with to these factors,which can provide reference for similar pipe jacking construction.