富水粉砂地层盾构隧道穿越河流沉降控制  

Study on Settlement Control of Shield Tunnel Crossing River in Water Rich Silt Stratum

作　　者：冯晓九 缪愔斓 魏浩 王鹏 FENG Xiaojiu;MIAO Yinlan;WEI Hao;WANG Peng(School of Environmental and Safety Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学环境与安全工程学院,江苏常州213164

出　　处：《常州大学学报（自然科学版）》2021年第1期77-84,共8页Journal of Changzhou University：Natural Science Edition

基　　金：国家自然科学基金资助项目(10272034)。

摘　　要：如何有效控制由于盾构法施工引起地层损失导致的沉降是目前研究的关键问题。以常州地铁二号线一期工程穿越河流的实际情况为例,结合ABAQUS对盾构下穿河流施工沉降进行数值模拟分析,研究盾构法在富水粉砂地层中穿越河流减小沉降的方法,结果表明,控制切口水压在1.14~1.19 kPa内,采用壁后注浆工艺,二次补压浆时每环推进4.2~5.8 m 3,且洞门接口管片采用刚度较大的铸铁环时,沉降能够得到有效控制,确保盾构隧道穿越河流施工安全。所得结论可为盾构下穿河流施工给予一定的参考。How to effectively control the ground loss caused by the shield construction method and the settlement caused by the shield tunneling under the river in the water-rich silt sand formation is the key issue of current research.This paper takes the actual situation of crossing the river in the first phase of the Changzhou Metro Line 2 project as an example,combined with ABAQUS to conduct a numerical simulation analysis of the settlement of the shield tunnel underneath the river,and study the method of the shield tunnel method to reduce the settlement in the water-rich silt formation.The results show that when the water pressure of the cut is controlled within 1.14—1.19 kPa,the grouting process behind the wall is adopted,each ring advances 4.2—5.8 m 3 during the secondary grouting,and the portal interface segment adopts a rigid cast iron ring.The settlement can be effectively controlled to ensure the safety of the shield tunnel crossing the river.The conclusions obtained can give a certain reference for the construction of the shield tunnel under the river.

关 键 词：盾构 穿越河流 沉降控制 接口管片刚度 

分 类 号：TU93[建筑科学—结构工程]