摘要
针对隧道斜交横通道施工对主隧道衬砌结构产生影响,以哈尔滨绕城高速天恒山公路隧道工程为依托,采用现场实测和三维有限元数值模拟的方法,对横通道施工阶段主隧道衬砌结构的变形规律和受力特性进行研究。研究结果表明:(1)横通道施工导致交叉口附近一定范围内的主隧道衬砌产生变形和应力集中,其影响范围在交叉口锐角一侧为1.82D(D为主隧道洞跨),在交叉口钝角一侧为1.32D;(2)衬砌变形以拱部下沉为主,在边墙部位产生外扩现象;(3)横通道的开挖破坏了主隧道原有的成拱效应,使交叉口处的衬砌产生应力集中;(4)随着横通道开挖深度的增加,主隧道衬砌结构的变形和应力逐渐减小,趋于稳定;(5)交叉口两侧的主隧道衬砌结构强度安全系数均大于设计值2.0;(6)交叉口锐角一侧的变形和应力集中程度大于钝角一侧,而安全系数小于钝角一侧。研究成果对类似工程的设计与施工具有借鉴作用。
For the influence of skew horizontal adit construction on the main tunnel lining structure,the Tianhengshan highway tunnel engineering of Harbin by-pass city expressway is taken as an example and the actual measurement and 3D finite element simulation are adopted to study the deformation regularity and the stress characteristics of main tunnel lining structure during the horizontal adit construction stage.The research results are shown as follows：（1） the construction of horizontal adit leads the main tunnel lining near intersection to occurre deformation and stress concentration,and the influence range in acute angle side of intersection is 1.82D（D is main tunnel span）,in obtuse angle side of intersection is 1.32D;（2） the lining deformation mainly is arch settlement, and secondly is side wall expansion;（3） the excavation of horizontal adit destroys the original arch effect of main tunnel,so as to create the stress concentration on the lining at the intersection;（4） with the excavation depth increment of horizontal adit,the deformation and stress of the main tunnel lining structure gradually decrease and tend to be stable;（5） The safety factors of main tunnel lining structural strength are greater than design values of 2.0 on both sides of the intersection;（6） the deformation and stress concentration at the intersection acute angle side are greater than that of the obtuse angle side,but the safety factor of the former is less than that of the latter.The research results can be used as reference for the design and construction of other similar engineering.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2010年第A02期3792-3798,共7页
Chinese Journal of Rock Mechanics and Engineering
关键词
隧道工程
斜交横通道
衬砌结构
三维有限元法
安全系数
tunnelling engineering
skew horizontal adit
lining structure
3D finite element method
safety factor
