摘要
对Ⅳ、Ⅴ、Ⅵ各级的软弱围岩,沿用相关规范计算所得的隧道围岩荷载,因级别不同,其荷载量值的差异往往过大。在现行公路隧道岩质围岩亚级分级方法的基础上,建立了新的围岩亚级分级与铁路隧道所采用的弹性纵波速度细化之间的关系,从而避免了铁路隧道不同围岩分级时其弹性纵波速度交叉重叠的现象。对Ⅲ、Ⅳ、Ⅴ、Ⅵ级岩质围岩,在本项研究中,对铁路隧道按照围岩弹性纵波速度Vp作了更进一步细化,并用以作为围岩初期支护设计压力的计算,避免相邻分级之间其计算荷载值差值过大造成的困难。结合青岛市地铁隧道工程,采用综合模糊判别方法对施工阶段围岩进行动态细化判定和调整,使隧道设计施工更为安全有据、经济合理。
For Ⅳ、Ⅴ、Ⅵ levels of weak rock,because of different levels,The calculated load of tunnel surrounding rock according to the relevant specification was too different.Based on surrounding rock sub-classification method of current highway tunnel,the relation between the new surrounding rock classification and the elastic p-wave velocity refining that was used by railway tunnel was built.The phenomenon of elastic p-wave velocity cross overlap was avoided when surrounding rock classification was different in railway tunnel.For Ⅲ、Ⅴ、Ⅴ、Ⅵ levels of weak rock,the further refining was done by Vp in railway tunnel,in order to calculate primary support design pressure of surrounding rock,so the oversize difference of computation load value Between adjacent classification was avoided.Combining with a subway tunneling of Qingdao,comprehensive fuzzy identifying method is used to judge Surrounding rock classification level of refinement and adjust,which is more safe and economical for design and construction.
出处
《土木建筑与环境工程》
CSCD
北大核心
2013年第S1期81-86,共6页
Journal of Civil,Architectural & Environment Engineering
基金
国家自然科学基金资助项目(51209180)
中国博士后科学基金(2012M510137)
关键词
深埋隧道
解决办法
围岩分级细化
初期支护
设计施工
railway tunnel
countermeasures
surrounding rock classification refinement
primary support
design and construction
