摘要
根据无锡地铁原状土样的室内三轴蠕变试验,结合Bingham模型和Kelvin模型构建蠕变本构方程,采用最小二乘法回归土体蠕变参数,将此蠕变本构方程和弹塑性理论相结合推导出可以考虑时间因素的隧道周边地层特征曲线方程,给出求解隧道周边变形和支护力随时间变化的一种简便实用的方法。结合无锡地铁1号线工程实例,分析管片支护力与变形随时间的变化规律。结果表明,考虑蠕变后随着时间的增加,相同支护力下会发生更大的变形,而限定某一变形需要更大的支护力;土体蠕变对管片支护力与洞周变形的影响还与管片的刚度有关。
A creep constitutive equation was established with combination of the Bingham creep model and Kelvin creep model, based on a triaxial creep experiment on the undisturbed soil in the subway system of Wuxi City. The soil creep parameters were determined using the least squares algorithm, and a time-dependent ground characteristic curve equation for the tunnel was deduced based on the established creep constitutive equation and the elastic- viscoplastic theory. A simple and applicable method for studying the deformation surrounding the tunnel and the supporting force varying with time is proposed. The variation of the segment supporting force and deformation with time was analyzed through a case study of a section of the Wuxi Subway Line No. 1. The results show that, first, after creeping, greater deformation will occur over time with the same supporting force, while a larger supporting force will be needed to restrict deformation within a certain range, and, second, the influence of soil creep on the segment supporting force and the deformation surrounding the tunnel is correlated with the stiffness of the segments.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第1期50-56,共7页
Journal of Hohai University(Natural Sciences)
基金
安徽省高校省级自然科学研究项目(KJ2011Z375)
铜陵学院人才科研启动基金(2012tlxyrc07)
关键词
软土地区隧道
管片受力
管片变形
蠕变模型
tunnel in soft soil area
force of lining segment
lining segment deformation
creep model
