不同埋深下大直径盾构隧道横向刚度有效率

发布时间：2018-04-18 19:15

本文选题：大直径盾构隧道 + 横向有效刚度　；参考：《同济大学学报(自然科学版)》2015年08期

【摘要】：盾构隧道衬砌结构整体性能受到纵缝及环缝接头不连续性的影响,接头受力状态随埋深变化发生改变,其刚度也将发生变化,进而引起结构整体刚度的改变,对于大直径深埋盾构隧道这一影响更为突出.基于该问题,以上海沿江通道越江隧道典型衬砌结构为例,采用横向变形等效原则,参考管片接头结构试验结果,研究大直径盾构隧道横向等效刚度随埋深而变化的规律,并考察了地基刚度与错缝拼装对于计算结果的影响.结果表明,大直径盾构隧道的横向刚度有效率与埋深有较大关联,覆土较浅时变化规律相对复杂,覆土厚度超过1.0倍直径后随埋深整体上呈现先递增而后递减的趋势,在埋深达到2.0倍直径后由于地层成拱效应不再继续降低,上述规律还受到地层条件的影响.研究成果对于大直径盾构隧道的设计与计算具有一定的参考价值.
[Abstract]:The overall performance of shield tunnel lining structure is affected by the discontinuity of longitudinal joint and annular joint. The stress state of the joint changes with the change of buried depth, and the stiffness of the joint will also change, which will lead to the change of the overall stiffness of the structure.This effect on large diameter deep buried shield tunnel is more prominent.Based on this problem, taking the typical lining structure of the crossing tunnel along the Yangtze River in Shanghai as an example, using the principle of lateral deformation equivalence and referring to the test results of segment joint structure, the law of the lateral equivalent stiffness of large-diameter shield tunnel varying with the buried depth is studied.The influence of foundation stiffness and misjoint assembly on the calculation results is also investigated.The results show that the effective efficiency of transverse stiffness of large-diameter shield tunnel is related to the depth of burying, and the variation law of overlying soil is relatively complex when it is shallower. The thickness of overlying soil is more than 1.0 times diameter and then decreases with the buried depth.After the buried depth reaches 2.0 times diameter, the formation arched effect is no longer reduced, and the above rules are also affected by the formation conditions.The research results have certain reference value for the design and calculation of large diameter shield tunnel.
【作者单位】：同济大学土木工程防灾国家重点实验室;同济大学岩土及地下工程教育部重点实验室;同济大学土木工程学院;上海市隧道工程轨道交通设计研究院;
【基金】：国家“九七三”重点基础研究发展计划(2011CB013800) “十二五”国家科技支撑计划(2012BAJ01B04) 中央高校基本科研业务费专项资金
【分类号】：U455.43

【参考文献】