不同空间位置双线隧道塑性区范围的研究
Study on the Plastic Zone of Double-line Tunnel at Different Spatial Locations
王智德 1李根 1武海港 2江俐敏3
作者信息
- 1. 武汉理工大学土木工程与建筑学院,武汉 430070
- 2. 武汉理工大学土木工程与建筑学院,武汉 430070;安徽省交通规划设计研究总院股份有限公司,合肥 230088
- 3. 武汉职业技术学院建筑工程学院,武汉 430074
- 折叠
摘要
针对双线地铁隧道开挖对周围土层造成沉降及形成塑性区问题,基于单线隧道塑性区的解析解,通过理论推导,提出了双线隧道塑性区的解析解,并采用数值分析方法验证了该方法的正确性.基于此,对比了双线隧道不同空间位置时的塑性区范围,获取了不同影响因素下塑性区分布规律.结果表明:不同埋深时的双线隧道塑性区分布形态呈现"蝴蝶状",左、右线隧道塑性区呈对称分布,且塑性区高度随埋深的增加而增大;空间夹角α分别为30°、45°、60°时,最大影响范围出现在左线隧道左侧拱肩和拱脚处、右线隧道右侧拱脚处及两隧道中间区域.提出了隧道埋深与塑性区临界安全距离的关系式,两者表现为线性递增关系.
Abstract
Aiming at the problem of settlement and formation of plastic zone in the surrounding soil layer caused by the excavation of two-lane subway tunnel,based on the analytical solution of the plastic zone of the single-lane tunnel,the ana-lytical solution of the plastic zone of the two-lane tunnel was proposed through theoretical derivation and the correctness of the method was verified by numerical analysis.Based on this,the range of plastic zone at different spatial locations of the two-lane tunnel was compared,and the distribution law of plastic zone under different influencing factors was obtained.The results show that,the distribution pattern of plastic zone in two-lane tunnels at different burial depths shows a"but-terfly shape",and the plastic zones in the left and right tunnels are symmetrically distributed,and the height of the plastic zone increases with the increase of the burial depth.When the spatial pinch angle α is 30°,45°,60°,the maximum influence range appears in the left arch shoulder and foot of the left tunnel,the right arch and foot of the right tunnel,and the two tunnels at the right arch and foot of the right tunnel.The maximum impact area occurs at the left arch shoulder and arch foot of the left tunnel,the right arch foot of the right tunnel and the middle area of the two tunnels.The relationship be-tween the tunnel burial depth and the critical safety distance of the plastic zone is proposed,and both of them show a linear incremental relationship.
关键词
双线隧道/塑性区/不同空间位置/数值分析/临界安全距离Key words
two-lane tunnel/plastic zone/different spatial locations/numerical analysis/critical safety distance引用本文复制引用
基金项目
国家自然科学基金(51374163)
武汉市城建局科技项目(武城建[2017]12号)
武汉市城建局科技项目([2019]12号)
出版年
2024
NETL
NSTL
万方数据