摘要
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。
The upward-moving of shield tunnel in construction has brought about great concern. The reasons of shield tunnel upward-moving were analyzed and classified into six aspects, including buoyancy, axial eccentric force, slurry pressure, foundation rebound, compression of covering soil, and the sand liquescence. The upward moving of shield tunnel brought by buoyancy was discussed with emphasis.Two kinds of anti-upward moving calculation models were presented considering the transverse and longitudinal characteristics of shield tunnel, which were called partial and longitudinal whole anti-upward moving model respectively. According to the characteristics and affecting area of the buoyancy, the partial anti-upward moving model was divided into single segment analysis model and whole segment ring analysis model. The similarities and differences of settlement and upward-moving were compared in the longitudinal whole anti-upward moving model, which manifested the coherence of the settlement and upward-moving of shield tunnel. The adaptability of the anti-upward moving analysis modes was also discussed.
出处
《公路交通科技》
CAS
CSCD
北大核心
2009年第5期91-96,共6页
Journal of Highway and Transportation Research and Development
基金
国家高技术研究发展计划(八六三计划)资助项目(2006AA11Z102)
国家自然科学基金资助项目(50808020)
中国博士后科学基金资助项目(20080440183)
关键词
隧道工程
盾构隧道
施工
上浮
管片
tunnel engineering
shield tunnel
construction
upward-moving
segment
