电力推进技术在海洋石油支持船中的应用

近年来,海洋石油支持船采用电力推进方式作为动力的应用越来越多。本文介绍了电力推进技术的主要优点,简单描述了海洋石油支持船的电力推进系统构成,阐述了电力推进系统的关键技术以及国内外现状。     

铁路应急指挥调度管理信息系统的研究

应急指挥系统是对突发事件进行快速反应,迅速有效地组织抢险,为铁路的运输安全提供强有力的保障.在分析铁路应急指挥调度系统中存在数据支持不足、直观性不强和信息通道不够等问题的基础上,提出一个综合集成的应急指挥调度系统,为铁路应急事件的处理提供支持.该系统由通信网络平台、信息共享平台以及其功能子系统构成,保证应急救援所需信息的完整性和实时性以及调度的有效性,实现跨部门、跨分局、跨路局的统一指挥、协调一致,达到快速反应、科学决策、综合指挥和联合行动的目标.     

Knowledge based decision support in airport terminal design

The state of the art in airport terminal design has essentially remained unchanged since the 1970s, relying on the use of detailed simulation together with empirical and statistical formulae for sizing the terminal. Air transport has altered considerably since then, with increased use of air travel for both business and leisure, together with the increased use of ‘hub’ terminals in which the terminal acts as an interchange stop on a journey involving several flights. The use of simulation involves a detailed analysis of the terminal design under one set of conditions. To change the design or operating conditions involves a complete resimulation using the new design parameters which is time consuming and computationally expensive.

By using a knowledge based approach, a system can be provided which has the flexibility and speed required to explore the consequences of implementing design decisions in a variety of conditions, together with the ability to use and alter facility sizing methodologies to reflect current and future design guidelines.     

浅埋黄土隧道土石分界高度对初期支护结构安全性的影响分析

为获得浅埋黄土隧道土石分界高度对初期支护结构安全性的影响,文章以临县隧道为工程背景,采用数值模拟的方法研究了浅埋土石分界高度及土石分界面位置对隧道初期支护结构安全性的影响。结果表明:土石分界致使隧道初期支护结构安全系数发生突变,分界面倾斜时安全系数分布不对称。同一种埋深条件下,随着土石分界面位置的下移,土石分界面以上部分偏压减弱,分界面以下的部分偏压增强。同一界面深度条件下,隧道初期支护结构左右断面偏压情况随着埋深增加而增大。当土石分界面分别位于隧道上导坑和中下导坑、分界面倾角为10°时,可通过增加20%隧道左侧荷载或减小20%右侧抗力系数来进行荷载计算。     

黄骅港冰期航标维护

冰期航标维护是航标管理工作的难点。文中笔者对黄骅港冰冻的成因和范围进行了阐述,并结合多年的防抗冰冻及航标维护的经验,提出了多项应对之策,旨在拓宽防护思路和方法,更好地提供航海保障。     

永临结合的初期支护侵限处理方法

文章结合RAS RMEL隧道工程实例,介绍了国外铁路隧道软弱围岩大变形段初期支护的侵限处理方法.该施工方法是通过加强监控量测,及时发现支护结构变形量的增大情况,并立即进行支护的加强,如复喷混凝土、施作系统锚杆及锁脚锚杆等.当发生塑性变形的区域较大时,先采取在拱部安装临时钢管横撑,并及时施作仰拱封闭的处理措施,控制支护变形；后对待处理区进行加固,并根据设计图纸的要求跳槽开挖梯形槽,施作初期支护,然后再施作防水层；最后,用模板台车施作二次衬砌.实践证明,该永临结合的处理措施较一般处理措施具有施工简单、安全、节约成本等特点,尤其适用于地质条件较差和工期较紧的工程项目.     

特大桥预应力混凝土连续箱梁满堂式碗口支架方案设计

混凝土连续箱梁施工中，支架为桥梁上部提供了施工平台，同时也是重要的支撑体系，其安全性必须得到充分保证。依据设计图纸和现场实际情况，设计了满堂式碗口支架的方案，并对方案进行了验算。     

非公路标志分类及布设位置研究

针对非公路标志的管理存在较大的困难这一现象，通过调查南京市非公路标志现状，从功能和支撑方式两个角度对非公路标志进行了分类，在分类的基础上从停车视距角度分别研究了非公路标志在交叉口、直线路段、弯道路段、上坡路段和下坡路段的布设位置，得到了具体的布设距离，为非公路标志的审批、设置和管理等提供一定的依据．     

福厦客专道路交叉连续箱梁现浇支架设计与施工

以新建铁路福州至厦门高速客运专线跨国道现浇支架为依托,对结构的屈曲分析、支架立杆、轴向压力等进行了计算分析,确保结构安全性,同时对条形基础提出了一次浇筑、预应力加载、分段拆除等设计和施工理念,并在实践中取得了良好的应用效果,可为其他类似现浇支架的设计、施工提供借鉴。     

The Development of a Visualization Methodology for Integrated Coastal Management

Coastal management information is frequently communicated to stakeholders and the public through complicated management documents and engineering plans. With the recognition that public involvement in coastal decision-making processes should be widened have come calls to develop new techniques to communicate complicated coastal information. Using Virtual Reality Geographical Information Systems and visualization packages, such information may be presented using formats more suitable for public consultation and information dissemination exercises than those currently employed. Using a site on the north Norfolk coast of England, an integrated Geographical Information Systems based methodology is presented that allows the visualization of proposed coastal management interventions. Visualizations have been produced that can be published in traditional paper-based management documents, or electronically. The different visualizations are compared and the technical issues surrounding their use discussed. It is argued that the methodology has clear advantages over traditional communication methods, although further research is necessary to determine how it may be practically employed by coastal managers.