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隧道洞口是交通事故多发路段,为此《公路隧道设计规范》提出了隧道洞外连接线应与隧道线形相协调的要求,但过分追求理想线形,往往造成工程规模和造价大幅增加。为了兼顾行车安全和工程规模,基于行车轨迹轨迹偏差限值,提出了公路隧道洞口平面线形协调的定量化判断标准。分别针对:洞口内外侧各3s设计速度行程均落在缓和曲线;洞口落在直线上,3s行程点落在缓和曲线上;洞口落在缓和曲线上,3s行程点落在圆曲线上等3种情况,提出了行车轨迹偏差值的计算方法,并将其与行车轨迹偏差限制比较,可以判断是否满足线形协调条件。
Tunnel openings are frequent road accidents. Therefore, the “Code for Highway Tunnel Design” puts forward the requirement that the tunnel connecting lines should be coordinated with the tunnel alignment. However, excessive pursuit of the ideal line shape often results in a substantial increase in the scale and cost of the project. In order to balance the driving safety and the project scale, a quantitative judgment criterion for coordination of plane and line of highway tunnel entrance is put forward based on the trajectory deviation limits. Respectively for: 3s inside and outside the hole design speed stroke all fall in the easing curve; hole falls on the straight line, 3s trip point falls on the easing curve; hole falls on the easing curve, 3s trip point falls on the circular curve and other three The paper proposes a method to calculate the deviation value of the driving lane and compares it with the driving lane deviation limit to judge whether the linear coordination condition is satisfied or not.