盾构法以不影响地面交通、机械化程度高、施工周期短等优势而被广泛应用于地铁隧道建设中。盾构法在施工过程中时常面临管片不均匀上浮引起的开裂、破损等问题,影响隧道的正常使用,而盾构隧道管片上浮机理与理论计算方面的研究还较为少见。本文针对盾构隧道施工期管片的不均匀上浮问题,深入分析了管片初始上浮阶段的上浮机理,提出了相应的上浮力/抗浮力、上浮量理论计算公式,结合工程算例对理论计算结果进行对比分析。结果表明:管片初始上浮可以分为快速上浮、缓慢上浮两阶段,其中快速上浮阶段上浮量约占总上浮量的80%~90%;总上浮量理论计算值均大于监测值,但每环管片上浮量的计算误差较为稳定,本文提出的理论计算公式可以为管片上浮量计算提供参考。
Shield tunneling method is widely used in subway tunnel construction because of its advantages such as not affecting ground traffic, high mechanization degree and short construction period. However, the problems of cracking and damage caused by uneven rising of segments are often encountered in the construction process of shield method, which affects the normal use of tunnel. However, the research on the mechanism and theoretical calculation of shield tunnel segment floating is relatively rare. In this paper, the floating mechanism of segments in the initial floating stage of shield tunnel is analyzed deeply, and the corresponding theoretical calculation formulas of upward buoyancy/anti-buoyancy and buoyancy are proposed. The theoretical calculation results are compared and analyzed with engineering examples. The results show that: The initial floating of the segment can be divided into two stages: rapid rising and slow rising, in which the rising amount of the rapid rising stage accounts for about 80%~90% of the total rising amount. The theoretical calculation value of the total floating amount is greater than the monitoring value, but the calculation error of the floating amount per ring is relatively stable, the theoretical calculation formula presented in this paper can provide reference for the calculation of the floating amount of the actual segment.
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