基于高速公路空间几何特性的线形协调性设计评价

Coordination Design Evaluation of Expressway Alignment Based on Spatial Geometric Properties

摘要:

为对高速公路线形协调性设计进行有效的评价和指导，利用驾驶模拟和实车试验获取车辆运行数据，提出一种基于线形空间几何特性参数拟合的协调性设计评价模型，并给出了指标选用及优化措施。首先，分析了优先进行线形协调性设计的特征指标，以曲率k和挠率τ作为描述高速公路线形空间几何特性的的特征参数。其次，结合驾驶模拟实验和实车试验，通过多元非线性拟合建立一般路段线形设计协调性与曲率差Δk、挠率差Δτ的二元多项式评价模型，并通过调整横断面和安全设施信息对模型进行修正。结果表明，该模型能较好地反映线形指标、横断面信息、交通安全设施与车辆运行状态间的作用关系，为高速公路线形协调性设计和应用研究提供指导。最后，通过反推Δk、Δτ取值范围，提出了指标选取的依据和优化措施。

Abstract:

To effectively evaluate and guide the coordination design of expressway alignment， this paper proposes an evaluation model based on alignment geometric parameter fitting， which uses driving simulation and real vehicle test to obtain vehicle operation data. The index selection and optimization measures are presented afterward. First， the indexes that give priority to coordination design are selected and the curvature k and torsion τ are proposed as the spatial characteristic parameters of alignment. Then， a binary polynomial evaluation model is established to evaluate the design coordination of alignment flexibility and curvature difference Δk and torsion difference Δτ by multivariate nonlinear fitting in combination with driving simulation experiment and real vehicle test. After that， the model is modified by adjusting the cross section and safety facilities. The results show that the evaluation model can better reflect the relationship between alignment index， cross-sectional information， traffic safety facilities， and vehicle operation estate. Furthermore， it provides guidance for the design and application of expressway alignment coordination. Finally， the basis of index selection and optimization measures are presented by deducing the value range of Δk and Δτ.