积冰位置对不同断面形式隧道衬砌冻胀力的影响
Inf luence of Icing Locations on Frost-heaving Force in Tunnel Lining with Different Cross-section
董宇苍 1朱永全 2高焱1
作者信息
- 1. 西南交通大学 土木工程学院，四川 成都 610031
- 2. 石家庄铁道大学 土木工程学院，河北 石家庄 050043
- 折叠
摘要
采用理论分析与数值模拟方法，研究铁路隧道3种断面形式、4种围岩级别、衬砌背后不同积冰厚度和积冰位置时，衬砌结构冻胀力大小及分布规律。研究结果表明：圆形隧道衬砌各点的刚度相等，直墙式隧道边墙、墙脚和仰拱的衬砌刚度较小，曲墙式隧道仰拱的衬砌刚度最小；围岩与衬砌刚度越大，积冰厚度越大，则冻胀力越大；3种断面形式隧道当积冰高度达到断面拱顶时拱脚弯矩最大，当积冰高度达到断面边墙中部时边墙弯矩最大。
Abstract
The frost-heaving force of railw ay tunnel lining structure and its distribution law w ere studied with 3 types of cross-sections and 4 kinds of surrounding rock level in the condition of different icing thickness and icing location behind the lining by using the theoretical analysis and numerical simulation methods. The research results show that the stiffness of each point in the circular tunnel lining is equal,the lining stiffness of the side wall,the wall basement and inverted arch in straight wall tunnel is small,the lining stiffness of inverted arch in curved wall tunnel is minimal,the frost-heaving force is greater with larger icing thickness and stiffness of surrounding rock and lining, the arch foot bending moment is maximum in tunnels with 3 types of cross-sections when the icing height reaches the cross-section vault and the side wall bending moment is maximum when the icing height reaches the middle of side wall in tunnel cross-section.
关键词
圆形/直墙式/曲墙式/隧道/衬砌/积冰位置/冻胀力Key words
Circular/Straight wall type/Curved wall type/Tunnel/Lining/Icing location/Frost-heaving引用本文复制引用
基金项目
中国铁路总公司科技研究开发计划项目(2016G002-A)
出版年
2016
NETL
NSTL
维普
万方数据