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盾构隧道抗浮计算模式及其适应性分析

, PP. 91-96

Keywords: 隧道工程,盾构隧道,施工,上浮,管片

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Abstract:

施工期盾构隧道的上浮问题随着盾构隧道的大量修建而引起了广泛关注。基于盾构隧道施工中的上浮问题,系统分析了隧道上浮原因,将其归纳为上浮力作用、轴向偏心荷载作用、切口水压影响、地基回弹作用、上覆土的反向压缩效应以及砂土液化等6个方面;重点分析了因上浮力引起的隧道上浮的抗浮计算模式从横向和纵向角度提出了局部及纵向总体2种抗浮计算模式。在局部抗浮计算模式中,依据上浮力的特性和作用范围,分为单一管片错动分析模式和整环管片错动分析模式;在纵向总体抗浮计算模式中,讨论了纵向沉降与上浮的异同,进而说明了二者的相通性;并分析了2种抗浮计算模式的适应性。

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