250km／h高速铁路轨道不平顺的安全管理

利用根据车辆－轨道耦合动力学思想所建立车辆－轨道垂横耦合模型,在充分考虑多种波长并存的情况下,仿真计算了250km/h高速铁路各种轨道不平顺的管理目标值。计算结果与日本和德国高速铁路轨道不平顺的经验管理目标值基本一致。     

就地冷再生技术在市政道路改造中的应用

以山西省太原市市政道路改造工程为依托,维特根泡沫沥青就地冷再生施工技术为基础,结合太原市学府街沥青旧路面的实际路况,设计了旧路面大修方案,进行了泡沫沥青混合料的配合比设计,介绍了泡沫沥青就地冷再生基层的施工工艺、施工组织。     

厂拌冷再生技术在高等级公路改造中的应用

沥青路面再生利用,能够节约大量的沥青、砂石等原材料,同时有利于处理废料、保护环境。通过山西省运城至风陵渡高速公路改造工程,介绍厂拌冷再生技术的施工工艺及社会和经济效益。     

城际铁路与市域快轨的规划决策支持研究

基于城际铁路与市域快轨在决策体系和功能技术上的现状背景,分析深圳、香港两地的都市圈轨道交通建设实践案例,旨在提出统筹空间规划、轨道交通规划与工程设计的决策支持框架。从出行人性化、空间相契合、经济可持续三方面阐述正确处理城际铁路和市域快轨关系应考虑的三方面因素。进而提出涵盖车站、线路、土地利用、周边接驳、投融资等方面的规划决策分析框架。强调城际铁路和市域快轨的功能要落实在都市圈的空间规划上,通过全程旅行速度来控制速度目标值的实现,进而确定车辆选型、供电制式、站间距等设计要素。     

一条专用车道双向运营BRT/轻轨的可行性

为有效满足BRT或轻轨系统的运行需求,提出在带有固定左转车道的繁忙通勤走廊中央设置一条BRT或轻轨专用车道用于双向运营的概念。由此产生了车辆相交问题,其相交空间设置于由左转车道产生的未利用或未被充分利用的道路中央隔离带。提供了公交车站和相交空间的概念设计可选方案和几何布局示意图,并考虑运行速度、发车间隔、相邻相交空间的距离及相交空间数量等条件,分析系统性能。为确保具有实用性,研究了系统在现有交通走廊上的可实施性。由于该系统具有利于TOD发展的潜力,也可作为未来发展两条专用车道系统的中间步骤。     

物流的转型--供应链管理

与物流相比,供应链管理更能够给企业带来巨大的经济效益。因此,对供应链管理的进一步研究具有现实的意义。     

交通事故的真实性分析

根据采集得到的真实事故数据,采用车辆损伤分析、能量分析和仿真分析等分析方法,同时应用KS—DYNA和MADYMO软件对交通事故进行重建,有助于认识交通事故发生的过程,了解事故损伤变形机理,从而进行事故责任认定和保险事故定损。     

高速公路改扩建边坡工程的稳定性数值分析

针对某高速公路改扩建过程中对边坡工程的二次开挖卸荷的稳定性问题进行分析,采用有限元软件midas／gts对边坡的开挖支护过程进行模拟,得出了开挖边坡过程中的应力场变化规律,开挖同时应对边坡及时支护。并求得了支护后的边坡安全系数。     

The planning and analysis of a new group rapid transit system: the SkyCabs monobeam system in Auckland

This paper examines a case study of the SkyCabs system as a way to alleviate some of the traffic problems of Auckland, New Zealand. SkyCabs is an elevated two-way monobeam carrying light eight-seater cabs on tracks on each side of the beam, available on demand, providing fast, pollution-free, unimpeded travel above the footpath with panoramic views of the city. The aim of this study is to investigate the attractiveness of implementing the SkyCabs system to and from Auckland central business district (CBD) and Auckland international airport by examining four variables: different routes, different number of stops/stations, different passenger demand levels, and different number of cabs in the system. The analysis utilizes geographical information system and simulation tools for the various scenarios considered. The results show that it is possible to assess the cost–benefit of alternative routes in terms of those four variables and rate of return on investment.     

Cost-effectiveness of reductions in greenhouse gas emissions from High-Speed Rail and urban transportation projects in California

A rising trend in state and federal transportation finance is to invest capital dollars into projects which reduce greenhouse gas (GHG) emissions. However, a key metric for comparing projects, the cost-effectiveness of GHG emissions reductions, is highly dependent on the cost-benefit methodology employed in the analysis. Our analysis comparing California High-Speed Rail and three urban transportation projects shows how four different accounting framings bring wide variations in cost per metric tonne of GHG emissions reduced. In our analysis, life-cycle GHG emissions are joined with full cost accounting to better understand the benefits of cap-and-trade investments. Considering only public subsidy for capital, none of the projects appear to be a cost-effective means to reduce GHG emissions (i.e., relative to the current price of GHG emissions in California’s cap-and-trade program at $12.21 per tonne). However, after adjusting for the change in private costs users incur when switching from the counterfactual mode (automobile or aircraft) to the mode enabled by the project, all investments appear to reduce GHG emissions at a net savings to the public. Policy and decision-makers who consider only the capital cost of new transportation projects can be expected to incorrectly assess alternatives and indirect benefits (i.e., how travelers adapt to the new mass transit alternative) should be included in decision-making processes.