山区高速公路螺旋展线隧道内平曲线最小半径

Helix line development's minimum radius of horizontal curve in freeway tunnel

通过对汽车前灯散射角、隧道标准断面以及驾驶人在隧道中驾驶规律的研究,并考虑汽车左转与右转行驶的不同特点,计算出了不同设计速度下满足山区高速公路隧道内螺旋展线停车视距的圆曲线最小半径。结果表明:《公路路线设计规范》规定的圆曲线最小半径不能满足高速公路曲线隧道内停车视距的要求;计算给出的最小半径不仅可以满足高速公路曲线隧道内停车视距的要求,而且可以保证隧道不加宽和超高不过大的要求,保持隧道内轮廓的统一,减少了设计和施工难度。

By the study of automobile＇s headlight scatter angle, standard cross-section of tunnel and driving rule in tunnel, the different characteristics of vehicle＇s turning right and left, this paper work out helix line development＇ s minimum radius of horizontal curve in freeway tunnel under different design speeds. The results indicate that the minimum radius of horizontal curve in the Chinese Specification can＇t meet the needs of stopping sight distance in curve tunnel. The calculated minimum radius can meet the need of stopping sight distance in curve tunnel without widening the super-elevation in tunnel. It can ensure unification in tunnel inner profile, decrease the difficulties of design and construction. 6 tabs, 7 figs, 6 refs.