摘要
采用注浆抬升技术治理盾构隧道不均匀沉降时,注浆产生的附加应力会增加管片内力,对隧道的长期服役性能造成影响。以宁波地铁某区间盾构隧道不均匀沉降治理工程为背景,通过对比现场实测数据与有限元模拟的结果,验证了有限元计算的可靠性,并在此基础上分析了有无内部支撑体系、不同注浆范围及注浆顺序情况下隧道结构内力的变化。分析模拟结果发现,内部支撑体系可有效减小隧道结构变形及附加内力;采用由近及远、先中部后两侧的注浆顺序,并尽可能扩大横向注浆范围的情况下,隧道产生的附加内力较小。
Grouting for shield tunnel lifting for the solution to shield tunnel uneven settlement increases the inner stress of shield tunnel lining, directly affecting the long - term performance of shield tunnel. Based on the regulating engi- neering of uneven settlement in a tunnel section of Ningbo metro, the FEM （finite element method） calculation result and the data measured from Ningbo metro are compared, the variation of lining inner stress with or without internal bracing system, the variation in different ranges and orders of grouting are analyzed. The simulation results show that when the grouting changes from distal to proximal, and the range of grouting is expanded, the additional inner stress of shield lining will be decreased.
出处
《城市轨道交通研究》
北大核心
2016年第9期93-98,共6页
Urban Mass Transit
关键词
盾构隧道
结构内力
注浆抬升
shield tunnel
structural inner stress
grouting lifting
