摘要
《JTG D70-2004公路隧道设计规范》中规定Ⅲ级围岩三车道隧道需设置厚45 cm仰拱混凝土,而《JTG-T D70-2010公路隧道设计细则》中则规定可以取消仰拱。鉴于此,文章依托省界隧道工程实例,采用有限差分软件,对Ⅲ_1级围岩情况下平底和仰拱两种支护结构形式进行了模拟对比分析,结合现场监控量测结果表明:Ⅲ_1级围岩三车道平底隧道和仰拱隧道整体的竖向位移、竖向应力及塑性区体积均相差在5%以内,Ⅲ_1级围岩三车道隧道可以采用平底结构形式代替仰拱,平底结构支护形式可以满足工程结构稳定性要求。
For a three-lane road tunnel in surrounding rock of grade Ⅲ, the concrete invert with the thickness of 45 cm should be installed according to the requirements specified in the Code for Design of Road Tunnels. However, as per the Guidelines for Design of Highway Tunnels the invert can be eliminated. Based on Shengjie expressway tun- nel project, fiat and inverted arch structures in grade Ⅲ1surrounding rock are simulated and compared using finite-difference software. The results show that the differences between the vertical displacement, vertical stress and volume of the plastic zone of the two support structure patterns are within the scope of 5%; a fiat arch structure can be used instead of an inverted arch for the three-lane tunnel in grade Ⅲ1 surrounding rock, and the fiat arch structure can meet the requirements of structure stability.
作者
王可意
徐东强
孙晓杉
WANG Keyi;XU Dongqiang;SUN Xiaoshan(School of Civil Engineering, Hebei University of Engineering, Handan 056038;School of Civil and Transportation Engineering, Hebei University of Technology 300401)
出处
《现代隧道技术》
EI
CSCD
北大核心
2018年第2期103-109,共7页
Modern Tunnelling Technology
基金
河北省交通厅重点科技计划项目(201302025)
