山区公路设计中,往往有同向曲线间直线长度不足以设置该两圆曲线的缓和曲线。此时一般认为宜将两圆曲线半径加大,或加大其中之一,使两个圆曲线构成单曲线或复曲线。但有时地形条件不允许这样办。笔者以为,当线距不足时,可采用补助圆把两段缓和曲线连接起来,使曲率的变化不致过骤,可能更为适宜。用补助圆连接两段缓和曲 In mountainous highway design, there is often not enough linear length between the same-direction curves to set the easing curve of the two circular curves. At this point it is generally considered appropriate to increase the radius of the two circular curves, or increase one of them, so that the two circular curves constitute a single curve or complex curve. But sometimes terrain conditions do not allow this. The author believes that when the line spacing is insufficient, the subsidy circle can be used to connect the two gentle curves, so that the curvature will not be changed, which may be more appropriate. Use the subsidy circle to connect two gentle songs