摘要
为了研究隧道埋深和施工方法对二衬支护时机的影响,以广梧高速公路牛车顶隧道为工程背景,建立数值计算模型,分别改变隧道埋深和施工方法,得到相应的隧道二衬支护时机.结果表明:通过数值计算,可定量得到二衬及掌子面之间的允许距离和埋深的关系;当埋深较小时,二衬与掌子面的允许距离随着埋深的增加而增加;当埋深超过某一限值时,隧道二衬与掌子面的允许距离基本不变;开挖工法对二衬与掌子面间的允许距离影响比较显著,而对仰拱与掌子面的允许距离影响很小.随着开挖断面分部的增加,开挖对围岩的扰动减小,因而可以适当延缓构筑二衬时机.若选取Ⅲ级围岩中的全断面开挖法作为参考基准,则围岩中二衬与掌子面的允许距离将由于选择不同工法需进行修正,相应的修正值为:全断面法1.0,上下台阶法和中隔壁法均为1.5.
In order to study the influence of the tunnel burial depth and excavation method on the second lining support time,the numerical calculation model was established with taking Niucheding tunnel of Guangwu highway as the engineering background.During the calculation,the corresponding second lining support time was obtained through changing the burial depth and excavation method for the tunnel.The calculation results show that the relation between the allowable distance of second lining to tunnel face with the...
出处
《沈阳工业大学学报》
EI
CAS
2010年第5期590-595,600,共7页
Journal of Shenyang University of Technology
基金
国家自然科学基金资助项目(50579088)
关键词
高速公路
隧道
二衬支护时机
埋深
施工方法
屈服接近度
允许距离
扰动
highway
tunnel
second lining support time
burial depth
construction method
yielding approach index
allowable distance
disturbance
