基于支撑树法的高速公路多路径识别问题研究

随着高速公路的不断建设，开始出现环路，路网密度不断增大，由此产生两点之间车辆行驶的多路径识别问题，是高速公路联网收费及管理中迫切需要解决的问题。通过深度优先搜索算法搜索出需要在交通网络中添加标识站的路段，把交通网络网状结构图转化为支撑树树状结构图，从而实现多路径的识别。     

高速公路项目的交通量预测方法探讨

从高速公路项目的自身特点出发,探讨了在建设项目工程可行性研究中,应用区域经济学分区理论,在区域社会经济发展预测的基础上,用四阶段法进行交通量预测的方法。     

Real-time crash prediction for expressway weaving segments

Weaving segments are potential recurrent bottlenecks which affect the efficiency and safety of expressways during peak hours. Meanwhile, they are one of the most complicated segments, since on- and off-ramp traffic merges, diverges and weaves in the limited space. One effective way to improve the safety of weaving segments is to study crash likelihood using real-time crash data with the objective of, identifying hazardous conditions and reducing the risk of crashes by Intelligent Transportation Systems (ITS) traffic control. This study presents a multilevel Bayesian logistic regression model for crashes at expressway weaving segments using crash, geometric, Microwave Vehicle Detection System (MVDS) and weather data. The results show that the mainline speed at the beginning of the weaving segments, the speed difference between the beginning and the end of weaving segment, logarithm of volume have significant impacts on the crash risk of the following 5–10 min for weaving segments. The configuration is also an important factor. Weaving segment, in which there is no need for on- or off-ramp traffic to change lane, is with high crash risk because it has more traffic interactions and higher speed differences between weaving and non-weaving traffic. Meanwhile, maximum length, which measures the distance at which weaving turbulence no longer has impact, is found to be positively related to the crash risk at the 95% confidence interval. In addition to traffic and geometric factors, wet pavement surface condition significantly increases the crash ratio by 77%. The proposed model along with ITS, e.g., ramp metering, Dynamic Message Sign (DMS), and high friction surface treatment can be used to enhance the safety of weaving segments in real-time.     

中法城市快速路参考速度相关几何特性的差异比较研究

结合近年在海外道路工程设计方面的经验,对比阐述中国与法国规范关于城市快速路参考速度相关几何特性的异同。通过对市政快速道路的定义、圆曲线半径、超高、缓和曲线、纵坡、竖曲线和行车视距的对比研究表明:法国规范限制性条文较少,多数设计指标限值不同程度有所放宽,而对于行车安全视距要求高。差异的主要原因是客观环境下参数取值以及设计理念、方法有别,相对于我国规范的面面俱到和操作性强的特点,法国规范总体要求比较灵活和宽松,设计者可有更大的发挥空间。     

格宾挡墙在沈吉高速公路中的应用

格宾挡墙是一种安全、环保、美观的新型支挡结构。详细介绍了格宾挡墙的具体构造、技术要求、施工工艺。在沈吉高速公路治理土质边坡滑坡中采用了格宾挡墙,有效治理了滑坡,生态效果良好。     

山岭重丘区高速公路的选线研究

高速公路在山岭重丘区的路线设计受到地形、地势、地质、水文等诸多自然条件的制约和限制。结合工程实例,对山岭重丘区高速公路选线进行分析和研究,寻找出运行安全、生态环保、易于实施、并且具有项目可持续发展的路线设计方案。     

沈四高速公路拱桥(涵)病害分析及处理方案

结合沈四高速公路的特点,总结概括拱桥、拱涵普遍存在的病害现象,分析病害的形成原因,并介绍了沈四高速公路上拱桥、拱涵的病害及加固处理方案。     

浅谈高速公路入口检测系统的功能及构成

介绍了入口超限检测系统的功能及构成,并且对其中部分分项系统进行了功能说明,对超限站的设置方案进行了详细对比分析。     

高速公路立交区路面施工测量技术浅论

针对高速公路互通交叉部位路面施工测量过程中常遇到的问题及解决方法做了分析和总结,并提出了自己的一些看法,供同行参考。     

高速公路债券融资可行性探讨

通过分析我国高速公路的现状、债券融资的优势,指出如何发展债券融资以促进我国高速公路的发展。