Charging load prediction method for expressway electric vehicles considering dynamic battery state-of-charge and user decision

Accurate prediction of electric vehicle(EV)charging loads is a foundational step in the establishment of expressway charging infrastructures.This study introduces an approach to enhance the precision of expressway EV charging load predictions.The method considers both the battery dynamic state-of-charge(SOC)and user charging decisions.Expressway network nodes were first extracted using the open Gaode Map API to establish a model that incorporates the expressway network and traffic flow fea-tures.A Gaussian mixture model is then employed to construct a SOC distribution model for mixed traffic flow.An innovative SOC dynamic translation model is then introduced to capture the dynamic characteristics of traffic flow SOC values.Based on this foun-dation,an EV charging decision model was developed which considers expressway node distinctions.EV travel characteristics are extracted from the NHTS2017 datasets to assist in constructing the model.Differentiated decision-making is achieved by utilizing improved Lognormal and Sigmoid functions.Finally,the proposed method is applied to a case study of the Lian-Huo expressway.An analysis of EV charging power converges with historical data and shows that the method accurately predicts the charging loads of EVs on expressways,thus revealing the efficacy of the proposed approach in predicting EV charging dynamics under expressway scenarios.

Reinforcement Technology for Soft Soil Roadbed in the Widened Section of Expressway Expansion

This article examines the soft soil roadbed reinforcement technology for widened sections of highways in a specific project.It provides an overview of the project,the principles of soft soil roadbed reinforcement technology for wide sections,and its practical application.The analysis aims to offer guidance on applying soft soil roadbed wide section reinforcement technology and enhancing the overall quality of similar projects.

高速公路对绿色经济效率的影响分析--基于产业结构优化视角

当前中国高速公路建设布局日趋完善,探究如何发挥其对地区产业结构优化的有力支持,进而助力绿色经济发展转型具有重要意义。论文基于2006—2019年中原城市群27个城市的面板数据,运用超效率SBM模型测算其绿色经济效率,从产业结构优化的视角实证分析了高速公路对绿色经济效率的影响,并以产业结构优化为中介与门槛变量,进一步探讨产业结构优化对于高速公路影响绿色经济效率的门槛效应。研究结果表明:中原城市群高速公路与绿色经济效率间呈现先抑制后促进的“U”型关系;产业结构优化在高速公路和绿色经济效率间发挥部分中介作用;产业结构优化存在单一门槛效应,随着产业结构优化水平的提升,高速公路对绿色经济效率由抑制作用转为促进作用。

双城经济圈背景下成渝两地对四川省内高速路充电站利用率影响研究

近年来,为了助推新能源汽车产业的发展,全国各地都在不断完善新能源汽车的充电设施建设。而随着成渝双城经济圈的不断发展,来往两地的新能源汽车也大大增加。在此背景下,本文利用蜀道畅充和高德地图APP,对省内171个高速公路充电站的利用率进行了研究。通过计算发现虽然目前省内高速路充电站利用率还不高,但成渝两市对充电站利用率存在影响。其影响因素包括到成都市的距离,是否为连接两地的高速线路,以及通往成都、重庆高速路的方向等。上述结论为两地今后更加合理规划、建设高速路充电站提供了参考依据。

Decision model and algorithm for traffic rescue resource dispatching on expressway

In order to solve the problems of potential incident rescue on expressway networks, the opportunity cost-based method is used to establish a resource dispatch decision model. The model aims to dispatch the rescue resources from the regional road networks and to obtain the location of the rescue depots and the numbers of service vehicles assigned for the potential incidents. Due to the computational complexity of the decision model, a scene decomposition algorithm is proposed. The algorithm decomposes the dispatch problem from various kinds of resources to a single resource, and determines the original scene of rescue resources based on the rescue requirements and the resource matrix. Finally, a convenient optimal dispatch scheme is obtained by decomposing each original scene and simplifying the objective function. To illustrate the application of the decision model and the algorithm, a case of the expressway network is studied on areas around Nanjing city in China and the results show that the model used and the algorithm proposed are appropriate.

Analysis of Heavy Metal Content in Food Crops Planted Along the Shaanxi Inner Mongolia Expressway

To understand the effect of the running of Shaanxi Inner Mongolia Expressway on food crops planted along the sides, we determined the heavy metal contents(Zn, Pb, Cu and Cb) in the digestion solutions of the root, stem and leaf from rice and corn. The results showed that highway promoted the accumulation of heavy metal elements in corn and rice. Compared with the CKs(crops produced where no highway extend), contents of heavy metal elements in two crops tested from two sampling sites were both over standard. This indicates that food crops planted within 100 m away from the highway are been polluted by heavy metals, which is directly related with the running of Shaanxi Inner Mongolia Expressway. Based on this, the areas within 100 m away from the highway are not suggested to cultivate food crops.

Expressway traffic flow prediction using chaos cloud particle swarm algorithm and PPPR model

Aiming at the real-time fluctuation and nonlinear characteristics of the expressway short-term traffic flow forecasting the parameter projection pursuit regression PPPR model is applied to forecast the expressway traffic flow where the orthogonal Hermite polynomial is used to fit the ridge functions and the least square method is employed to determine the polynomial weight coefficient c.In order to efficiently optimize the projection direction a and the number M of ridge functions of the PPPR model the chaos cloud particle swarm optimization CCPSO algorithm is applied to optimize the parameters. The CCPSO-PPPR hybrid optimization model for expressway short-term traffic flow forecasting is established in which the CCPSO algorithm is used to optimize the optimal projection direction a in the inner layer while the number M of ridge functions is optimized in the outer layer.Traffic volume weather factors and travel date of the previous several time intervals of the road section are taken as the input influencing factors. Example forecasting and model comparison results indicate that the proposed model can obtain a better forecasting effect and its absolute error is controlled within [-6,6] which can meet the application requirements of expressway traffic flow forecasting.

Study of macroscopic fundamental diagram on Shanghai urban expressway network in China

The macroscopic fundamental diagram（ MFD） is studied to obtain the aggregate behavior of traffic in cities. This paper investigates the existence and the characteristics of different types of daily MFD for the Shanghai urban expressway network. The existence of MFD in the Shanghai urban expressway network is proved based on two weeks＇ data.Moreover, the hysteresis phenomena is present in most days and the network exhibits different hysteresis loops under different traffic situations. The relationship between the hysteresis phenomena and the inhomogeneity of traffic distribution is verified. The MFDs in the years of 2009 and 2012 are compared. The hysteresis loop still exists in 2012, which further verifies the existence of the hysteresis phenomenon. The direct relationship between the length of the hysteresis loop（ ΔO） and the congestion is proved based on sufficient data. The width of the hysteresis loop, i. e., the drop in network flow（ ΔQ） has no relationship with the congestion, and it varies from day to day under different traffic situations.

Construction of Cultural Landscapes along the Ya'an-Luguhu Expressway——Discussion about Techniques of Designing Highway Cultural Landscapes

The concept of cultural landscapes was introduced,and it was proposed that the construction of highway cultural landscapes should follow the principles of "protection first,secure,integrated,suitable for actual conditions,economic,natural and ecological".In this study,relevant theories were taken to analyze the design of cultural landscapes along the Ya'an-Luguhu Expressway in Sichuan Province.Natural conditions,profound cultures and historical resources in the study area were analyzed,and the construction of its cultural landscapes was further discussed from the perspectives of properly dividing landscape spaces,determining the orientation of cultural landscapes,refining regional cultures,choosing carriers of cultural landscapes,improving cultural value of important landscape nodes by using artistic settings,applying more local materials and so on.So that helpful references could be provided for the landscape design of other expressways,and the integration of cultural landscapes and highway landscape system could be realized.

Slope Protection with Vegetation of Baoji(Shaanxi)-Hanzhong(Shaanxi) Expressway

With expressway development and environment protection consciousness improving, slope protection technology with vegetation has drawn much more attention. From the perspective of ecology, Baoji-Hanzhong Expressway maximized slope protection technology with vegetation and formed attracting landscapes on basis of eco-protection. This research introduced the technology of Baoji-Hanzhong Expressway, and explored a low-cost and effective biological slopeprotection way, suitable for Baoji-Hanzhong Expressway, according to slope protection technologies, at home and abroad, with botany, water and soil conservation engineering, and architecture, which fixed and stabilized slopes, prevented rainfall scouring, and advanced slope protection development in China.

面向分布式数据安全共享的高速公路路网拥堵监测

应用人工智能技术对高速公路路网道路状态进行监测已成为热点,然而,数据孤岛及隐私保护是高速路网智能决策面临的挑战。为实现分布式数据安全共享及智能决策,以拥堵问题为例,提出基于联邦学习的高速路网道路拥堵状态监测策略。利用摄像头实时数据,在密态可计算的同态加密联邦学习智能决策架构下,建立基于道路区间优化的拥堵状态监测模型。结果表明,在确保分布式数据安全共享的前提下,能够有效实现高速路网道路拥堵状态监测。

高速公路工程中预制混凝土连续梁预应力智能张拉施工技术分析

为提高高速公路施工效率与施工质量,研究预制混凝土连续梁预应力智能张拉施工技术。在所选高速公路桥梁工程上定位预应力筋位置并安装钢绞线,同时计算钢绞线张拉力伸长量,结合计算结果设置钢绞线张拉参数;构建预应力智能张拉系统,在该系统内控制张拉设备,实现多千斤顶同步张拉,从而完成连续梁预应力张拉施工。经实验分析可知:相较于传统人工张拉方式,该智能张拉技术可有效降低张拉过程中的伸长量偏差。

基于标准化施工的高速公路重难点施工技术研究

高速公路施工周期一般都较长,尤其是在涉及到有非常规结构时,为满足施工精度要求,其造价和施工周期都会相应增加。为了更好地满足施工现场对于建设周期和工程造价的需求,决定采用标准化设计、精细化施工的理念,对施工现场进行统一管理。本文以广东省某高速公路施工为例,其重难点问题包括特殊路基以及桥梁的高墩,采用标准化设计后,进行模板统一。结果证实,进行标准化施工后,其施工质量保证率、施工工期以及造价都得到相应的节约。

高速公路黄土隧道施工质量控制关键技术研究与工程应用

高速公路黄土隧道开挖扰动变形大,建设难度高,容易受支护、施工方法等影响,亟需研究施工质量控制关键技术,提高工程建设水平。文章以某高速公路黄土隧道工程为例,简要阐述了工程黄土地质条件及其缺陷,提出隧道超前预支护、洞口开挖与边坡防护技术、隧地加固技术、仰拱施工控制技术、防排水技术等,并分析工程关键技术应用效果,以期为相关工作者提供参考。

BIM技术赋能高速公路全场景数字化交付应用实践

随着中国交通强国战略的深入实施,数字化转型已成为交通基础设施建设的关键驱动力。本文以苏台高速公路为例,在设计阶段通过全专业数字化设计,实现设计品质和精度的提升,同时提高沟通效率和服务质量;在施工阶段通过全业务数字化管控,降低施工风险,增强管理效率和建设品质,在后续运营养护阶段,将为智慧高速的数字化场景应用提供坚实的数字基础。本项目的实践不仅展示了BIM技术在提升工程效率和质量方面的潜力,也为后续类似项目的数字化应用提供了借鉴和参考。

高速公路软弱路基水土联合堆载预压施工关键技术

堆载预压是一种最常见的软弱路基处理方法,可显著提高软弱路基在填筑过程中的沉降速率,减小不均匀沉降,提高路基的稳定性与强度。一般来说,传统堆载预压主要以土石方作为载体,由于不利于生态环境保护,且运输过程中也会产生占用耕地、弃土运输费用高等问题,目前已逐步淘汰。基于此,本文以某高速公路项目为例,采取水土联合堆载预压施工技术对软弱路基进行处理,并通过跟踪监测,判断施工技术实际效果,以期为类似工程提供借鉴。

复杂条件下高速公路箱梁架设施工方案设计研究

随着大湾区高速公路网的不断完善,高速公路选址越来越趋于复杂的地形地貌条件,在施工中会面临各种各样的复杂工况。增天高速朱宁路跨线桥低净空下穿220kV高压线,上跨县道X268及龟岭村路交叉口,县道X268旁又有10kV高压线和地埋自来水管及多条通信线路、20~30m高的行道树,复杂的施工工况为该桥的箱梁架设增加重大的安全风险。通过对现场施工条件的精准分析,架梁方案设计分两种工况,采用架桥机和大吨位随车吊两种方案完成箱梁架设,未发生险性事件,为后续同类施工提供了借鉴。

轨道交通共线的城市快速路路线方案研究

以金海路快速化改造工程为例,研究与现状轨道交通共线的城市快速路路线方案。对比不同主线敷设形式优缺点和适用性,推荐采用了用地集约、交通功能较好、对轨道交通影响较小的主线高架形式。通过对每个路段的主线线位分析,结果表明主线线位靠红线北侧布置与规划中心线线位相比,方案可行且更为合理。在主线靠北设置条件下,主线、辅路和匝道线形方案在设计过程中同步考虑了轨道交通的影响,并对匝道衔接地面段线形进行比选,推荐线形、视距和交通组织较好的方案。

路面结构层对高速公路加宽路基沉降的影响研究

为了预防和控制高速公路加宽工程路基出现差异沉降,保障工程质量,利用有限元法,系统分析了路面面层模量与厚度、基层模量与厚度、土基模量等对高速公路加宽路基沉降变形的影响规律。结果表明:路面结构层参数对于高速公路加宽路基的受力与变形特性具有显著的影响,高速公路加宽路基的沉降量随着路面结构层厚度和刚度的增大而显著减小,提升路面结构层的厚度和刚度可以有效预防高速公路加宽工程出现差异沉降。

封边胶技术在高速公路路面维修接缝处置中的应用研究

文章以辽宁省高速公路路面维修中的接缝处置工作为研究对象,分析了进行新旧路面接缝处置的必要性。以2023年辽宁省局部路段维修项目为例,提出了改性沥青封边胶技术方案。结果表明,采用改性沥青封边胶可有效防止接缝渗水,加强新旧路面的粘结,确保新旧路面平顺衔接。