摘要
以湛江湾跨海盾构隧道工程为背景,应用数值分析方法,建立了单环衬砌结构的三维有限元精细模型,研究了在不同水头作用下单环管片结构以及接缝部位的变形情况。采用修正惯用法得出在最大水头作用下管片结构的内力分布,由此推算出管片内、外侧的环向钢筋应力,并与现场的应力监测数据进行对比。研究表明:1)高水压作用下,单环管片衬砌的变形呈现"横鸭蛋形",且管片结构变形和接缝张开量均与外水压力变化呈线性关系;2)作用水头每增加10 m,衬砌结构中各接缝张开量绝对值约增加0.5mm;3)采用修正惯用法计算得到的钢筋应力与实测结果较为吻合,较好地反映了隧道管片的实际受力状态。
A fine three-dimensional finite element model of a segment ring lining structure is established by means of numerical simulation and on the basis of construction of Zhanjiang Bay sea-crossing shield tunnel. The deformation of a segment ring and the segment joint are studied under the effect of different water heads. The modified routine method is adopted to analyze the stress distribution of segment structure under the maximum water head. The circumferential reinforcement stresses of inner and outer segment are calculated and compared with monitoring data. The results show that： 1） Under high water pressure,the single segment ring is deformed into ＂horizontal ellipse ＂ shape; and the segment structure deformation and joint opening have a linear relation with variations of water-pressure. 2） The absolute joint opening increases by 0. 5 mm when the water head increases by 10 m. 3） The reinforcement stress calculated by means of modified routine method is consistent with the monitoring data,so as to reflect the actual force situation of tunnel segment quite well.
出处
《隧道建设》
北大核心
2016年第3期288-294,共7页
Tunnel Construction
基金
华南理工大学亚热带建筑科学国家重点实验室自主研究课题项目(2016KB16)
关键词
跨海盾构隧道
高水压
管片变形
管片受力
三维有限元精细模型
修正惯用法
sea-crossing shield tunnel
high water pressure
segment deformation
stress on segment
fine three dimensional finite element model
modified routine method
