中俄国际交通走廊珲春国际港可行性分析

珲春市是"一带一路"东起点,也是吉林省借港出海唯一通道。滨海2号路线为长春—吉林—珲春—扎鲁比诺港,将吉林省与俄滨海边疆区海港连接起来,实现东北货物南运出境不出国。由于珲春—扎鲁比诺港路线尚处起步阶段,集疏运条件需要培育、磨合的过程,相较形成规模的渤海湾港口通道存在劣势。首先对标营口港路线运费标准,确定珲春节点具有经济性的腹地范围,再根据腹地企业确定相关货种,在保证完成浙吉两省合作任务的同时,确保项目的经济合理性。     

Modeling the day-to-day traffic evolution process after an unexpected network disruption

Although various approaches have been proposed for modeling day-to-day traffic flow evolution, none of them, to the best of our knowledge, have been validated for disrupted networks due to the lack of empirical observations. By carefully studying the driving behavioral changes after the collapse of I-35W Mississippi River Bridge in Minneapolis, Minnesota, we found that most of the existing day-to-day traffic assignment models would not be suitable for modeling the traffic evolution under network disruption, because they assume that drivers’ travel cost perception depends solely on their experiences from previous days. When a significant network change occurs unexpectedly, travelers’ past experience on a traffic network may not be entirely useful because the unexpected network change could disturb the traffic greatly. To remedy this, in this paper, we propose a prediction-correction model to describe the traffic equilibration process. A “predicted” flow pattern is constructed inside the model to accommodate the imperfect perception of congestion that is gradually corrected by actual travel experiences. We also prove rigorously that, under mild assumptions, the proposed prediction-correction process has the user equilibrium flow as a globally attractive point. The proposed model is calibrated and validated with the field data collected after the collapse of I-35W Bridge. This study bridges the gap between theoretical modeling and practical applications of day-to-day traffic equilibration approaches and furthers the understanding of traffic equilibration process after network disruption.     

处理大斜度简支板桥的一种实用方法

本文从高速公路工程施工角度出发,提出了处理大斜度简支板桥的一种经济简捷实用的方法＝墩、台顶设置异型块法。并给出了这种方法的工程应用实例。     

土工织物在道路工程中的应用

介绍了土工织物的种类,分析了土工织物的特性及其应用机理。     

基于GIS的不良地质三维建模及线路优化设计研究

现代选线设计更为注重地质选线、环境选线的理念,需要对选线区域的地质问题进行有效的可视化表达。基于Arc GIS对三维数据处理及其可视化功能,在建立三维地形环境的基础上,通过获取不良地质的矢量、栅格数据以及钻孔数据,建立不良地质实体模型,并将其叠加到三维地形中得到三维地质选线环境,从而对经过不良地质区域的线路进行更加全面地平立面绕避方案比选,解决单一平面绕行引起的方案缺失问题,使线路设计方案更具科学性。     

进路信息数据表编制软件的优化设计方案

提出一种优化设计方案,引入信号平面图作为该编制软件的基础资料,通过自动获取平面图数据,构建站内多速度模型,实现进路数据编制的全面自动化。经工程设计实践证明,该方法操作简单,且能保证数据的准确性,极大地提高了工作效率。     

A Novel Optimal Routing for Navigation Systems/Services Based on Global Navigation Satellite System Quality of Service

The positioning quality of global navigation satellite system (GNSS), or GNSS quality of service (QoS), is a major factor impacting real-time navigation performance. Commonly requested routes (i.e., shortest or fastest) may include areas with poor GNSS QoS, which can subsequently degrade navigation performance. To provide alternative routes with high or acceptable GNSS QoS along a route, a novel optimal routing for navigation systems/services based on GNSS QoS by utilizing integrated GNSS (iGNSS) QoS prediction is presented in this article. New routing criteria based on GNSS QoS are maximum availability, maximum accuracy, maximum continuity, and maximum reliability. Two experiments were conducted to compare GNSS QoS-based routes against shortest routes. In one experiment, routes were simulated, and in another, generated routes based on GNSS QoS were evaluated against GPS-based trajectories as ground truths. The results show that GNSS QoS-based routes provide routes with higher QoS, more than 50%, and longer, about 50%, than shortest routes.     

武广高铁列车进路预告信息存在问题及改进措施

剖析了列车进路预告信息系统的工作原理,分析了列车进路预告信息存在的诸多问题,提出了改进的措施。     

地热隧道对拉日铁路选线的影响研究

通过对拉日铁路高地热分布特征、地热形成原因、高温隧道热害对工程的影响分析,利用地热研究理论,建立计算模型,采用数值模拟技术对隧道地温场进行模拟分析,揭示隧址区地热分布规律,提出可供线路通过的地温异常区相对低温通道,并以拉日铁路吉沃西嘎隧道高地热预测和线路方案选择为例予以说明。总结高海拔地热地区选线思路及原则,为类似地区工程的设计和建设提供借鉴。