施工技术 2016年7月上 114 CONSTRUCTION TECHNOLOGY 第45卷第13期 D01:10.7672/sgjs2016130114 盾构隧道施工中管片上浮力学时变特性研究* 徐俊，柳献2 (1.上海建工集团股份有限公司，上海200080；2.同济大学土木工程学院，上海200092) [摘要]管片脱离盾尾后在注浆液作用下上浮将影响工程施工质量.鉴于此，采用复配技术对单液型可硬性浆液 进行制备，对管片上浮模拟试验方案进行了设计，对摩擦力/摩擦系数及浮力的计算公式进行了推导，最后对管片 的受力情况及其时变特性进行了研究.结果表明：摩擦力/摩擦系数在试验初期(0~6)基本呈线性增长趋势，随 后(6~14.5)呈阶梯形增长趋势，最后趋于稳定；浮力随时间的推移呈线性下降趋势，待浆液完全凝固时，浮力 消失. [关键词]隧道工程：盾构；注浆液：模拟试验；摩擦系数；浮力 [中图分类号]U455.43 [文献标识码]A [文章编号]1002-8498(2016)13-0114-04 Research for the Mechanics Time-varying Characteristics of Segment Upward Movement of Shield Tunnel During Construction Xu Jun' Liu Xian2 (1.Shanghai Construction Group Co.Lid.Shanghai 200080 China; 2.College of Ciril Engineering Tongji University Shanghai 200092 China) Abstract:Segment floats upward under the effect of grouting slurry during shield tunnel construction and thus affects the project quality.Based on this grouting slurry is prepared by adding mineral admixture and supplementary gelled materials segment upward movement simulation test is designed frictional force/friction coefficient and buoyancy calculation formula are also established and finally the mechanics time-varying characteristics of segment upward movement is studied.The results confirm that friction coefficient/frictional force between grouting slurry and segment shows the linear trend at first (0~6h) then ladder type growth (6~14.5h) and flatten out in the end.The buoyancy is decreasing over time when grouting slurry curdled pletely it es to zero. Key w...
盾构隧道施工中管片上浮力学时变特性研究.pdf
