摘要
为了研究盾构隧道管片在上软下硬地层中的上浮机理,通过对施工阶段单环管片的受力情况进行分析,得出了浆液产生的浮力是引起管片上浮的主要诱因的结论。同时,建立了上软下硬地层中盾构隧道管片上浮量计算模型,引入上浮力时变系数,推导出了管片上浮量预测公式,并结合青岛地铁1号线某盾构区间施工实践,验证了其理论解的准确性。最后,提出了有效的抗浮措施,可为盾构隧道内管片上浮的控制提供参考。
To study the floating mechanism of shield tunnel segments in upper soft and lower hard formation,by analyzing the stress of the single-ring segments in the construction stage,it is concluded that the buoyancy generated by the slurry is the main cause of segment floating.At the same time,the calculation model of the buoyancy amount of shield tunnel segments in upper soft and lower hard formation is established,and the formula for predicting buoyancy amount of segments is derived by introducing the time-varying coefficient of buoyancy.Combined with the construction practice of a shield tunnel section of Qingdao Metro Line 1,the accuracy of the theoretical solution is verified.Finally,effective antifloating measures are put forward,which can provide reference for the control of segment floating in shield tunnel.
作者
胡瑞
王旭春
杨怀远
孙建
HU Rui;WANG Xuchun;YANG Huaiyuan;SUN Jian(College of Civil Engineering,Qingdao University of Technology,Qingdao,Shandong 266033,China)
出处
《建筑施工》
2019年第11期2057-2060,共4页
Building Construction
关键词
盾构隧道
上软下硬地层
管片上浮
计算模型
控制措施
shield tunnel
upper soft and lower hard formation
tunnel segment floating
calculation model
control measure
