摘要
不合理的导坑形状及其位置对隧道拱顶位移影响很大。文章假设导坑形状为圆锥曲线形式,用因次分析法对影响隧道施工的主要工程参数进行了量纲分析,确定了计算步骤。用控制变量法分别以导坑形状和导坑开挖位置为变量,建立了有限元分析程序,对不同围岩力学参数下二者引起的拱顶位移进行了比较。结果表明,采用双侧壁导坑法施工V级围岩二车道隧道,当导坑形状是离心率为2.0的双曲线,且导坑与隧道中心最近距离为2.6 m时,拱顶位移最小。
Considering that an unreasonable shape and location of a drift heading may greatly affect vault displacement, and assuming that the drift heading is a conic curved shape, this paper presents a dimensional analysis for the major parameters affecting tunnel construction. Relevant calculation steps are determined, and a finite element analysis program with a control variable method is established using the shape and location of the drift heading as variables in order to compare the vault displacement induced by the two variables under different mechanical parameters of the surrounding rock. The results show that the minimum vault displacement occurs when the drift heading is in＇the shape of a hyperbola with an eccentrieity of 2.0, and the closest distance between the drift heading and tunnel center during the construction of a two-lane tunnel by the double-side-drift method in surrounding rock of grade V is 2.6 m.
出处
《现代隧道技术》
EI
CSCD
北大核心
2015年第6期118-125,共8页
Modern Tunnelling Technology
基金
国家自然科学基金(41572263
51309222)
江苏省自然科学基金青年基金项目(BK20130193)
高等学校博士学科点专项科研基金新教师类资助课题(20130095120016)
关键词
V级围岩
二车道隧道
双侧壁导坑法
数值模拟
导坑形状
导坑位置
拱顶位移
Surrounding rock of grade V
Two-lane tunnel
Double-side-drift method
Numerical simulation
Shape of drift heading
Location of drift heading
Vault displacement
