盾构隧道穿越文物施工技术探讨

西安地铁二号线采用盾构法施工,沿西安市南北中轴线,要先后4次下穿明城墙,2次旁穿钟楼,文物保护是施工中面临的重大课题之一。施工前期采取对护城河堆载反压,对城墙和钟楼布设隔离桩进行预加固的防护措施;施工过程采取土压平衡模式,严格控制出土量,并通过信息化管理监测施工参数,及时二次补浆。最终监测的结果表明,施工过程达到了对文物保护的要求。盾构施工经验,对后期地铁穿越文物施工具有指导作用,对穿越其它重要建筑物施工也具有积极的借鉴作用。

Technical Discussion on Shield Tunneling through under Ancient Relics

Protection for ancient relics is a big challenge during Xian underground railway construction.The construction of No.2 line will be along the north-to-south middle axis of Xian city and its shield tunneling will be four times through under Ming city walls and two times through beside bell tower.In advance-phase of the underground railway construction,surcharge reaction for the moats and isolation piles protection for city walls and bell tower are adopted to protect the relics.Then,during the construction pe...