成都地铁2号线牛王庙车站半盖挖法设计

文章在对地下车站常用的施工工法做了对比和分析的基础上,提出了车站半幅顶板先行施作、回填覆土及恢复半幅路面交通后,再敞开另外半幅路面进行结构顺作施工的方法.对该施工方法的关键节点技术、结构计算情况、主要施工步骤作了详细的分析和研究,并对施工中可能出现的问题提出了相应的处理措施.半盖挖法可有效解决地铁车站施工用地、工期要求紧迫与地面交通、周边环境之间的矛盾,并且工程投资较为合理,具有良好的经济和社会效益.     

新型临时路面系统在深圳地铁车站施工中的应用

针对深圳地铁科学馆站盖挖工程,介绍了一种新型的临时路面支撑系统--军用梁的设计与施工概况.实践表明,这种临时路面系统的应用是成功的,取得了较好的社会效益和经济效益,对类似工程具有重要的参考价值.     

城市地铁车站端头竖井盖挖与暗挖施工对比分析

以北京地铁四号、十号线的换乘站--海淀黄庄站为工程背景,对车站端头竖井采用盖挖与暗挖两种工法施工进行了经济、技术和工期等方面的综合对比分析,探讨了交通繁忙地段城市地铁车站端头竖井施工工法的优劣选择,其经验可为类似工程提供借鉴.     

地铁车站多工法施工关键技术数值模拟研究

本文结合具体实际工程,对车站CRD工法施工地铁进行了数值模拟和在施工2号线车站主体时运用PBA工法,对该车站主体也进行了数值分析模拟,模拟计算结果表明在CRD工法中的薄弱环节是拆除底部临时支撑施工二衬,本文还提出了"先上后下,先边后中"的最优化导洞开挖施工顺序,希望能给地铁车站施工提供经验借鉴。     

深圳地铁车站盖挖顺作施工技术

文章以深圳地铁科学馆站工程为例,介绍了盖挖顺作法施路面系统的施工、交通疏解以及车站主体施工工艺.     

地铁车站近接正交下穿既有地铁隧道的变形分析

北京地铁五号线崇文门车站正交下穿既有地铁二号线崇文门站东端喇叭口式过渡段区间,两者之间的净距仅为1.98m.该地铁车站施工采用全断面注浆条件下的柱洞法.文章以此工程背景为研究对象,采用3D-σ三维数值分析软件,建立地铁车站-已有地铁隧道的三维有限元模型,计算分析隧道动态施工时地层以及既有地铁隧道沉降变形发展规律,对比分...     

盖挖法土方施工

本文叙述地铁车站盖挖顺作法钢支撑架设和土方开挖,对类似工程有一定借鉴。     

盖挖逆作地铁车站的结构特点

地铁车站所处的建筑环境极其复杂,对于多层多跨的大型综合性地铁车站一般应首选盖挖逆作法施工.深入研究盖挖逆作地铁车站的结构特点,不仅可以优化地铁车站的结构设计,而且可以促进盖挖逆作施工方法的关键技术的进步,及其在我国城市地铁车站工程中的广泛应用.     

广州地铁体育西路站立体交叉方案探讨

广州地铁三号线与地铁一号线在体育西路站形成立体交叉,三号线的地下三层车站结构穿越一号线的地下二层车站结构.实施此项工程既要确保一号线的安全、正常运营,又要确保三号线车站施工的顺利进行,文章针对采用不同节点结构形式对既有一号线体育西路站的影响进行了比较和探讨,并对设计方案进行了技术分析.     

地铁车站深基坑围护结构设计分析

为了优化地铁车站深基坑围护结构设计,保证结构的稳定性,首先阐述地铁深基坑支护施工现状,并在此基础上,对地铁车站深基坑围护设计施工中存在的问题进行分析,列举出当下常见的基坑围护结构中的常见围护形式。并针对具体问题,给出地铁车站深基坑围护施工的解决策略,并分别从设计专项、渗水措施、周边荷载、地连墙施工及加固施工等方面进行叙述。为今后相关技术人员研究地铁车站深基坑围护设计提供借鉴,通过对深基坑围护设计具体方法的探讨,进一步优化地铁车站深基坑围护建设,以期在一定程度上,规避地铁车站深基坑建设的风险及安全隐患。     

Analysis of factors affecting the choice of route of pedestrians

Pedestrians as compared to vehicular traffic enjoy a high degree freedom of movement even in heavily congested areas. Consequently, there are more alternative links available to pedestrians between a given origin‐destination (O‐D) pair. This paper describes a study done by the University of Calgary to evaluate the factors affecting the choice of route on intra‐CBD trips or trips within the Central Business District (CBD).

An origin destination survey conducted in downtown Calgary, Alberta enabled the identification of the most significant factors influencing the choice. These factors were analyzed in relation to the physical characteristics of the location, personal characteristics of the trip maker and the type of the trip.

It appears that most people chose the shortest link and factors such as the level of congestion, safety or visual attractions were only secondary. This suggests that the length should be made a major consideration when planning and designing pedestrian links.     

Non-parametric analyses of efficiency of airports

This paper estimates the efficiencies and productivity changes of 12 international airports in the Asia-Pacific region based on data from 1998 to 2006. We apply stochastic frontier analysis (SFA) to compute efficiency estimates and use the Malmquist productivity index (MPI) to analyze productivity changes. We use the SFA model with a translog-type production function after testing the statistical hypotheses. According to the results of the SFA hypothesis tests, airports have experienced a technological regression; the deviations from the efficiency frontier are caused more by technical inefficiency than random noise. However, the inefficiency was found to decrease. The MPI reveals a declining trend resulting more from technological change than from efficiency change, with a decrease in inefficiency. Taken together, both the hypothesis tests and the MPI not only provide consistent conclusions, but also suggest that airports should concentrate on technological progress.     

波纹管应力分析研究进展

评述了波纹管应力理论研究方法的进展情况，围绕解析法、工程近似法和数值法，对波纹管理论研究中的一些主要成果作了较详细的回顾和总结，对各种研究方法作出了评价，展望了亟待解决的一些问题。     

注汽管道承压能力评估和实物试验验证

基于失效评估图技术对某注汽管道进行了承压能力评价,给出了管线在不同腐蚀壁厚情况下的极限承压能力和极限裂纹尺寸。并利用实物爆破试验验证了评价方法的安全性和有效性,通过对爆破断口进行宏观和微观分析,发现管段的开裂属于脆性开裂。     

实现多组态计量软件集中监控的可行性分析

天然气自动计量系统有多种组态软件,由于软件的不相通性,造成了计量系统数据采集的通用性差、数据传输与入库的时效性差、数据利用的可靠性低.结合各组态软件的实际情况,从设计上充分利用Oracle大数据处理能力以及Partition(分区表)的特性,实现历史数据的存储,应用WebService与COM+数据访问组件提供多层数据访问架构,采用OPC与DDE工业数据交换协议,实现了各站场计量数据的实时上传,为连续数据采集和实时监控提供了可能,节约了改造成本.     

城市轨道交通杂散电流监测系统概述

介绍了城市轨道交通工程中杂散电流不同的监测系统的构成,分析了集中式、分散式和智能型等监测系统的配置和功能,以及智能型实时在线监测系统的重要意义,为轨道交通工程杂散电流监测系统的选择与应用提供参考。     

埋地管道防腐保温层失效评价

明确埋地管道防腐保温层的技术评价标准,对埋地钢质管道的安全运行,延长管道使用寿命具有重要意义。为了对埋地管道防腐保温层做出有效评价,从间接检测与开挖检测2个方面,结合现场检测数据,提出了基于防腐保温层的电流衰减率、绝缘电阻率、质量状况与厚度的分级评价标准及基于4种评价指标的综合评判方法。工程实践表明,该评价标准对防腐保温层是否存在失效能做出有效判断。     

Preliminary results of an analysis of areas of influence in Shanghai

The main deficiency of most current modeling approaches to transportation can be identified as neglect of the integration of existing geographical knowledge in regard to the ex ante transport/land use modeling approaches, with its focus on territorial dynamics and theory development. This paper addresses this aspect of the problem by introducing a theoretical and methodological framework for the analysis of the interrelationship between land uses. The analysis attempts to determine to what extent the functional land use in a city can be considered an ordered pattern. The order sought does not rely on purely spatial configurations, but on the correlation of transportation and land use. The first section of this paper focuses on theoretical considerations. It stresses the fact that conventional approaches do not apply in the present context. It then suggests an alternative based on areas of influence and measured in terms of level of attractance of land uses. The second describes a procedure based on this alternative following the remarkable contribution of Hanjoul, Beguin and Thill. An application of this procedure to the analysis of Shanghai is then examined. Finally, an evaluation of the strategies for optimizing the interrelationship between land uses is presented. The paper concludes with a possible research agenda.     

输油管道中原油乳状液的流变性研究

原油乳状液的流变性是原油开采后在管道中输送的重要研究方面,为了更好地研究这一性质,采用电动搅拌机、偏光显微镜以及流变仪等仪器来测定不同含水率的原油乳状液在不同条件下的黏度,观测不同含水率的原油乳状液在偏光显微镜下的形态。并且分别对原油乳状液的黏度与含水率之间的关系以及与剪切速率之间的关系进行研究,初步确定了所测区块原油乳状液的转相点以及该区块原油乳状液的流变特性,为生产中的油气集输提供了理论依据。     

Direct analysis of the perceived importance of attributes of reliability of travel modes in urban travel

Reliability of travel modes was found to be the most important characteristic of transportation systems in several attitudinal investigations of individual travel behavior. This paper represents the first part of a research effort aimed at gaining a better understanding of the characteristics of reliability of transportation modes in urban travel. In this research, reliability characteristics are identified; their importance relative to each other is assessed, and an insight into possible structure of an objective reliability index is discussed. The research is based on perceived values of reliability, which were identified through a large attitudinal survey conducted in the Chicago metropolitan area.