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悬臂式掘进机在煤矿系统广泛应用,而在城市地铁工程则很少采用.文章对悬臂式掘进机在广州地铁六号线东湖站站前停车线暗挖隧道工程中的应用情况做了一个比较全面的总结,指出城市地铁隧道工程推广应用掘进机技术成熟,经济合理,尤其在软岩隧道施工中对围岩扰动小,适应能力强,开挖质量高,安全有保障,具有传统钻爆法隧道施工无法比拟的优势. 相似文献
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Shani Wallis 《现代隧道技术》2007,(Z1):15-17
瓜达拉玛隧道工程具备掘进竞赛的所有要素,但这并不是一般的竞赛.本文所述不只是四台掘进机同时投入隧道掘进全速竞赛的情况,而是重点叙述这四台掘进机(两台海瑞克、两台维尔特)在28.377km长的隧道掘进中关于减小风险的措施、每台掘进机掘进中所面临的挑战以及管理策略对掘进机以至工程整体性能的影响等几个方面的经验. 相似文献
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悬臂掘进机在复杂断面地铁隧道中的应用研究 总被引:1,自引:0,他引:1
悬臂掘进机是应用于煤矿煤巷掘进的综合机械化掘进设备,将其应用于复杂断面的地铁隧道之中,其适用性与围岩的力学特性和施工工法有直接关系.工程实践研究表明,悬臂掘进机适用于无临时仰拱的台阶法开挖,影响悬臂掘进机掘进效率的围岩力学特性指标主要有:岩石的单轴抗压强度和围岩的裂隙间距,按照这2个指标可将悬臂掘进机的适用性分为3级;掘进过程中所产生的粉尘可通过改变通风方式来解决.除此之外,影响悬臂掘进机掘进效率的因素还有:初期支护方式和出碴运输方式,高强树脂锚固锚杆支护系统和连续运输出碴系统是否与悬臂掘进机较好的匹配.通过对悬臂掘进机在实际工程中应用情况的分析,探索了在复杂断面地铁隧道之中应用悬臂掘进机的适用性和影响悬臂掘进机掘进效率的因素以及存在的问题,且在实际工程中得到了验证. 相似文献
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悬臂掘进机在交通隧道施工中被更多的使用,但针对其在不同隧道断面大小、地质条件等方面的施工能力和适应性还存在诸多疑问,基于此,文章结合相关工程案例,分析了不同断面大小、地质条件下的地铁、铁路隧道采用悬臂掘进机施工的工效、能耗问题,综合对比分析了其主要性能和适应性,对能否采用悬臂掘进机、如何选择、主要运作性能等提出了建议. 相似文献
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本文较全面地介绍了1997年4月13-18日在奥地利维也纳召开的第二十三届国际隧道会议以及笔者参数加会议以后所得到的一些信息和个人的体会。论文着重谈论了隧道工程师们所关心的当今国际上隧道技术的现状和发展趋势。笔者受本次会议论文的启发,提出了隧道掘进机最快推进日进度与平均推进度之比值反映了隧道掘进机施工技术综合水平这样一个观点。笔者认为该比值将来也可以作为衡量隧道掘进机综合施工技术的一个主要参数。 相似文献
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全断面岩石掘进机(TBM)可分为敞开式、护盾式(单护盾、双护盾)以及复合式等型式,城市轨道交通工程安全、优质、快速施工的关键是TBM设备的正确选型.文章对城市轨道交通工程TBM选型的原则进行了论述;并结合重庆轨道交通六号线工程,通过对其线路条件、沿线隧道埋深、工程地质和水文地质条件、隧道使用要求、支护与衬砌形式、工期及造价等的综合对比分析,确定出了最佳TBM选择型式,即在岩石地层城市轨道交通工程中首先应选择敞开式TBM,其次再选择复合式TBM. 相似文献
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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. 相似文献
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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. 相似文献
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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. 相似文献
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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。 相似文献
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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。 相似文献
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《Transportation Research Part A: General》1991,25(6):407-418
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. 相似文献
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Joseph N. Prashker 《Transportation》1979,8(4):329-346
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. 相似文献