浅埋隧道仰拱计算模型与动态设计  

Calculation Models and Dynamic Design for Inverted Arch of Shallow Mountain Tunnels

作　　者：郑建中 邹正明 吕康成[2] 伍毅敏[2] 

机构地区：[1]安徽交通投资集团公司,合肥市230011 [2]长安大学公路学院,西安市710064

出　　处：《公路》2007年第12期199-203,共5页Highway

摘　　要：由于缺少仰拱设计的理论依据,目前许多隧道的仰拱设计不尽合理,在浅埋隧道的仰拱设计中问题尤为突出。通过分析软基与隧道结构稳定性的关系,提出了浅埋隧道仰拱荷载的确定方法,其中以仰拱荷载系数将拱顶地层对隧道结构的垂直压力与仰拱荷载联系起来。结合仰拱的施工工艺,建立了三铰拱仰拱力学模型,给出了合理拱轴线的方程和内力计算公式。提出了浅埋隧道仰拱的设计步骤,并结合工程算例做了进一步说明。考虑到隧道开挖揭露的地质条件可能与设计勘察的地质条件有出入,建议将动态设计的理念引入到仰拱设计,使设计依据可靠,设计方法合理。For lack of calculation theory, the design of inverted arch in some tunnels is not reasonable, especially in shallow tunnels. With a load coefficient, the relation between the upward press from the soft rock and the load on the inverted arch is built up. Considering the construction technology, a mechanics model of three-hinged-arch is built, and the equation of reasonable axial line and formula for internal force of inverted arch are given. In addition, a calculation example is offered to account for the design method, which can be consulted by application. Considering the actual geological conditions may differ from the survey and design, the dynamic design adopted in inverted arch design is suggested in order to achieve a reliable and reasonable design.

关 键 词：山岭隧道 仰拱 浅埋 三铰拱 

分 类 号：U452.2[建筑科学—桥梁与隧道工程]