四台阶九步法在雅苑隧道松散填土段施工中的应用  

Application of four steps and nine-step method in loose backfill soil section construction of Yayuan tunnel

作　　者：李时磊 

机构地区：[1]中铁十一局集团第五工程有限公司,重庆400000

出　　处：《工程建设》2018年第2期52-56,共5页Engineering Construction

摘　　要：重庆市轨道交通三号线北延伸段工程雅苑隧道属于城市回填松散土质中大跨度浅埋隧道,采用四台阶九步开挖法,及时闭合成环,优化锁脚锚管和钢拱架连接钢筋施工,地表及仰拱底部采用钢管桩并结合注浆对土体进行固结,并通过控制仰拱与掌子面间的距离有效地控制施工变形。四台阶九步法在隧道施工中保证了工程质量和安全,提高了施工效率,降低了成本,节约了资源。The Yayuan tunnel for north extension project of Chongqing Metro No. 3 line belongs to large span shallow tunnel of city backfill of loose soil,the four steps and nine-step excavation method was adopted in the construction to timely close loop as a ring and optimize the locking anchor pipe and steel arch connecting reinforcement construction,the steel tube pile was adopted for the ground surface and the bottom of inverted arch,and the soil mass was consolidated in combination with grouting,and the construction deformation was controlled effectively by controlling the distance between the inverted arch and tunnel face. The nine-step method of four steps ensures the quality and safety of the project,improves the construction efficiency,reduces the cost and saves the resources.

关 键 词：浅埋隧道 四台阶九步法 人工填土层 施工工序 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]