摘要
针对目前公路线性超高过渡段存在行车稳定性不足以及小坡断面排水不良等问题,对高速公路超高过渡方式进行研究。基于动力学软件CarSim仿真平台,构建了3种曲线型超高渐变仿真模型,如三次抛物线、上半波正弦型、下半波余弦型曲线;同时,以高速公路的平曲线为仿真道路模型,分析了横坡为0处的超高渐变率,验证了不同超高渐变方式下的行车稳定性,并输出了相应的稳定性参数变化情况。分析表明:多次抛物线、上半波正弦型、下半波余弦型缓和曲线超高渐变模型的超高渐变率最大值均大于线性过渡方式,分别超出50%,100%及57%。与线性渐变率为一定值不同,采用曲线型超高过渡方式进行过渡的渐变率为连续变化的值,上述超高渐变方法都在回旋线中点达到临界值,且渐变率关于中轴对称。曲线型渐变过渡起终点附近的侧向加速度、横摆角速度曲线较为平滑。通过对3类曲线型过渡形式下的排水长度进行计算分析,结果表明:三次抛物线的过渡形式更有助于超高过渡段的排水。建议超高过渡段中最大超高渐变率与零坡断面位置相结合,以此降低横向排水不畅路段的长度,增强路面排水能力。采用曲线型超高渐变模型对改善多车道高速公路长缓和曲线渐变段的稳定性及排水性能有重要意义。
In view of the current insufficient driving stability of the linear super-elevation transition section of highway and the unfavorable characteristics of the drainage of small slope section, the super-elevation transition mode is studied. Based on the dynamics software CarSim simulation platform, 3 kinds of curve-type super-elevation gradient models(cubic parabola, upper-half sine-type and lower-half cosine curve) are constructed. Taking the horizontal curve of the expressway as the model simulation road, the super-elevation gradient rate at its zero-slope section is analyzed, the driving stability under different super-elevation gradient modes is verified, and the corresponding stability parameter changes are output. The analysis shows that(1) The maximum super-elevation gradation rates of the models of multi-parabola, upper-half sine-type, lower-half cosine curve and curve-type super-elevation gradient are all greater than those of the linear transition mode, exceeding 50%, 100% and 57% respectively.(2) Different from the linear gradient rate which is a certain value, the gradient rates of the transition using the curved super-elevation transition mode are the continuously changing values. The above-mentioned super-elevation gradient methods all reach the critical value at the midpoint of the spiral curve, and the gradient rates are symmetrical about the central axis.(3) The curves of lateral acceleration and yaw rate near the start and end of the curve-shaped gradual transition are relatively smooth. The result of calculation and analysis of the drainage length of the 3 types of curved transition modes shows that the transition mode of cubic parabola is more conducive to the drainage of the super-elevation transition section. It is recommended to combine the maximum super-elevation gradient rate in the super-elevation transition section with the position of the zero-slope section to reduce the length of road section with poor lateral drainage and enhance the drainage capacity of road surface. The curve-type sup
作者
屈强
李星
吴明先
潘兵宏
王贵山
QU Qiang;LI Xing;WU Ming-xian;PAN Bing-hong;WANG Gui-shan(CCCC First Highway Consultants Co.,Ltd.,Xi'an Shaanxi 710075,China;School of Highway,Chang'an University,Xi'an Shaanxi 710064,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2021年第9期15-24,共10页
Journal of Highway and Transportation Research and Development
基金
中交科技基金项目[2018]05号。
