A network‐based model for estimating the market share of a new high‐speed rail system

This paper presents a novel application of static traffic assignment methods, but with a variable time value, for estimating the market share of high‐speed rail (HSR) in the northwest–southeast (NW–SE) corridor of Korea currently served by air, conventional rail and highway modes. The proposed model employs a time–space network structure to capture the interrelations among competing transportation modes, and to reflect their supply‐ and demand‐side constraints as well as interactions through properly formulated link‐node structures. The embedded cost function for each network link offers the flexibility for incorporating all associated factors, such as travel time and fare, in the model computation, and enables the use of a distribution rather than a constant to represent the time–value variation among all transportation mode users. To capture the value‐of‐time (VOT) of tripmakers along the target corridor realistically, this study has developed a calibration method with aggregate demand information and key system performance data from the NW–SE corridor.     

基于HLA的列控系统多车仿真策略研究

基于列控系统需求进行的多车仿真研究,是构建完备的列控仿真与功能测试环境的基础环节。本文针对列控系统多节点、分布式的特点,设计基于HLA的列控系统多车仿真方案,提出两种多车仿真策略。根据不同的仿真策略构建基于HLA的多车仿真联邦的逻辑模型和高层仿真模型。对采用不同仿真策略实现的多车仿真联邦进行性能测试,实验结果表明多辆仿真车整体作为一个联邦成员加入仿真联邦的策略更适用于多车仿真,该仿真策略能够满足列控系统中多车仿真的需求。     

高烈度震区独塔斜拉桥减震优化设计

高烈度震区独塔斜拉桥在纵、横向地震作用下均需满足相应的抗震性能要求,以唐山市二环路上跨津山铁路独塔斜拉桥为例,该桥综合采用主塔处设置纵向粘滞阻尼器,辅助墩和边墩设置横向粘滞阻尼器的结构体系,分别抵御纵、横向地震。设计对阻尼系数和阻尼指数等进行了详细的参数分析;对合理横向抗震体系进行研究。研究表明:阻尼系数和阻尼指数应进行参数分析,并综合考虑梁端梁-墩相对位移、桥塔受力等合理选择。横向阻尼约束体系相对漂浮体系和固定体系更优。本桥减震设计体系合理,取得了很好的减震效果。     

高等级公路膨胀土地段路基施工技术

在分析膨胀土工程特性的基础上，提出了膨胀土路基施工技术要点和基本要求，同时介绍了石（家庄）安（安阳）高速公路邢台段膨胀土地基处理技术措施     

Mechanical Properties of SFHPC after Exposure to High Temperatures

Introduction High-performance concrete ( HPC) with highstrength or high durability is gradually replacing thenormal concrete ( NC), especially in structuresexposed to severe environment. The advantages ofHPC are attributed to the improvement of internalmi…     

Model Test Study on’Lost’Deformation and Corresponding Control Measures in Soft Rock Tunnels with Extremely High Ground Stress北大核心CSCD

In order to study the laws of core rock deformation and’lost’rock deformation in soft rock tunnels with high ground stress, the deformations of core rocks in front of the working face and surrounding rocks are monitored by model test method, and the tunnel excavation process is simulated in detail under different high ground stress levels and working conditions with/without lining. The results show that: (1) the ground stress plays a key role in determining the installation time of soft rock tunnel support; (2) the advance deformation within 0.5D in front of the face accounts for about 2/3 of the total advance deformation; (3) the’lost’deformation behind the tunnel face has a great impact on the monitoring and measurement. With a certain high ground stress, there is a power function relationship between the’lost’deformation and the distance from the tunnel face. With the high ground stress greater than 20 MPa, it has little impact on the’lost’deformation; (4) in order to effectively control the advance deformation in soft rock tunnels with high ground stress, it is necessary to reinforce the core rock mass within 0.5D in front of the tunnel face. For the core rock mass within 0.5D~1D in front of the tunnel face, the reinforcement depends on the actual situation. © 2022, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

利用卫星影像进行新线勘测设计的可行性研究

主要从铁路设计阶段、卫星影像的特点、制作地形图等方面分析利用卫星影像进行新线勘测设计的可行性     

高性能混凝土结构耐久性分析

以苏通大桥超高索塔为例从索塔锚固区钢混结构高性能混凝土制备与应用技术进行分析,探讨了工程中如何从配合比的设计出发,提高混凝土结构耐久性,从而延长混凝土结构使用寿命的技术方案。     

高速铁路的列车检测方式及比较

随着高速铁路控制系统的发展,列车运行检测的方法和手段越来越丰富,列车检测技术也更多地涉及了通信、计算机和信息处理技术。其进一步的发展必将对高速铁路列车运行安全性、舒适性、能耗效率和机车维修维护水平的提高产生积极影响。     

格构锚杆组合加固技术在高边坡治理中的应用

以贵州省思南县宏达山水家园工程拟建场地内的高边坡为例,针对该边坡的工程地质、水文地质、岩体结构特征及变形破坏迹象,通过边坡中层面和节理面的空间组合关系确定了边坡潜在滑动面,并以此建立了边坡推力计算模型。在治理设计过程中采用了格构锚杆组合加固技术,并系统的阐述了其设计思路、设计计算过程,为解决高边坡的分析和治理难题提出了一种新的思路。