摘要
基于弹性地基梁沉管隧道纵向计算理论,提出了一种刚度影响线分析方法,为节段式沉管隧道接头剪力的分析计算提供了理论基础。研究了沉管隧道接头剪力与容许地基刚度变化之间的关系,在研究确定地基刚度变化的幅值、模式及与纵向差异沉降之间关系的基础上,研发了基于接头剪力键容许剪力的纵向差异沉降简化计算公式。通过两个算例对刚度影响线分析方法及纵向差异沉降容许值简化计算公式进行了验证。纵向差异沉降容许值计算公式形式简单、物理意义明确、使用方便,为沉管隧道地基处理方案的确定提供了方法。
On the basis of a large number of calculation of longitudinal numerical model of immersed tunnel, a method named stiffness influence line method has been conducted, which is used for the calculation of shear forces of segment type immersed tunnel joints under overall warming condition. Then, the relationship between allowable variation ratio of soil stiffness and allowable joint＇s shear force has been given. After making clear of amplitude and variation pattern of soil stiffness and its relationship between longitudinal differential settlement, allowable longitudinal differential settlement formula has been derived, which is based on the allowable joint＇s shear forces. Finally, the correction of stiffness influence line and applicability of allowable differential settlement formula have been verified by two calculation examples. The allowable differential settlement formula has such advantages as simple form, clear physical meaning, and user-friendliness, which can be the basis for quick determination of the feasibility of ground improvement and foundation solution.
出处
《公路》
北大核心
2015年第4期22-27,共6页
Highway
基金
国家科技支撑计划课题
项目编号2011BAG07B01
关键词
沉管隧道
接头剪力
刚度影响线
纵向差异沉降容许值
简化计算方法
immersed tunnel
longitudinal differential settlement
shear forces of joint
stiffness simplified calculation method influence line
allowable value of
