隧道出入口平面线形一致性  

Consistency of Horizontal Alignment at Tunnel Entrance and Exit Zone

作　　者：杨轸[1] 唐莹[1] 唐磊[1] 

机构地区：[1]同济大学交通运输工程学院,上海201804

出　　处：《同济大学学报（自然科学版）》2012年第4期553-558,共6页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金(70801044);教育部高等学校博士学科点专项科研基金(200802471006)

摘　　要：针对现行公路隧道设计规范对隧道进出口处平面线形一致性缺乏明确判别标准,提出了方向盘冻结3s导致的行车轨迹同原有路线的偏移值作为线形一致性的控制性指标,控制阈值取0.2m.对3种不同设计条件下的隧道线形一致性进行分析,发现缓和曲线参数是影响平面线形一致性的重要指标.通过理论推导给出不同设计条件下隧道进出口平面线形一致性的判别标准,使设计者能在保证线形安全的前提下对隧道进出口平面线形进行灵活设计和评价.应用该研究成果对龙庆高速公路某隧道洞口的线形一致性进行了分析,提出了相应的改进建议.Current code of tunnel design lacks specific criterion for judging horizontal alignment at entrance and exit zone of highway tunnel. Mter 3-second freezing of steer wheel, the deviation of the track from the desired path is proposed to evaluate the consistency of horizontal alignment at tunnel entrance and exit, and the control threshold is 0.2 m. The design conditions are classified into three groups and studied in detail. Spiral curve parameter is found to be a significant design index to guarantee the consistency. Then the equations for derivation calculation in different cases are deduced, and the indexes of the horizontal alignment at the tunnel entrance and exit zone are proposed for more flexible design. Based on the research results, an analysis is made of the consistency of the horizontal alignment of a tunnel of Longquan-Qingyuan expressway, and improvement is proposed.

关 键 词：隧道出入口 平面线形 控制指标 一致性 缓和曲线参数 

分 类 号：U452.2[建筑科学—桥梁与隧道工程]