某滑坡形成机制及其治理方法探讨

文章结合某滑坡实例,针对区域地质概况和滑坡特征,对滑坡形成机制及影响滑坡的因素进行分析,确定滑坡滑动模式;对滑带土的力学参数进行反演分析并对滑坡稳定性进行计算,提出了相应的滑坡治理方案。     

抗滑桩在堆积体滑坡治理中的应用

堆积体滑坡是滑坡的一种重要类型,沿下伏基岩面失稳是堆积体滑动破坏的主要模式之一。文章以受构造影响的某高速公路堆积体滑坡为依托,阐述了滑坡的地质条件、基本特征及滑坡成因,并通过传递系数法对滑坡的稳定性进行计算分析,同时依据计算结果对两种治理方案进行了比较,最终选择圆桩对滑坡进行处理。根据后期监测结果可知,滑坡变形未进一步发展。该滑坡的成功治理为堆积层滑坡治理提供了参考。     

某服务区边坡稳定性分析及治理措施研究

文章结合某高速公路服务区滑坡工程实例,基于该滑坡的基本特征,应用FLAC-3D软件建立滑坡模型,对该滑坡的稳定性进行了分析评估,并提出了针对性的滑坡治理措施。     

典型牵引式滑坡数值模拟及治理措施研究

牵引式滑坡是高速公路施工中常见的边坡破坏形式。文章以阳朔至平乐高速公路典型牵引式滑坡为例,对牵引式滑坡的特性进行研究,并结合该滑坡的勘测数据和地形数据,建立滑坡有限元模型进行破坏模式和治理机制分析。结果表明,牵引式滑坡是由于底部坡脚失稳造成对上部土体支撑力不足,进而引起中上部结构失稳下滑,在实际工程中可采用加固坡脚、增加坡脚抗滑力的方式进行治理。     

道路滑坡处治设计分析

为提高对滑坡处治设计分析的重视,首先从道路滑坡情况入手,分析道路滑坡的形态特征,探讨道路滑坡的原因,然后对道路滑坡物理学参数进行研究,最后结合实际案例提出一些具体的处治设计应对措施方法,希望能够为相关研究提供一定的参考。     

山区高速公路滑坡处治探索与实践

文章以河池至百色高速公路K49+540~K49+760路堑左侧滑坡处治工程为例,对山区高速公路路堑边坡滑坡治理难题进行研究,分析了滑坡的影响因素及成因机制,并基于极限平衡理论的折线型滑动面推力传递系数法对滑坡进行稳定性计算分析,提出了针对性的滑坡治理方案。     

某高速公路K129+740～K129+841段斜坡路堤滑坡的处理

斜坡路堤滑坡一直是公路修筑中的热点问题,结合某高速公路路堤滑坡病害处治工程对斜坡路堤滑坡病害的成因与处治技术开展研究,分析了滑坡的类型与成因,对滑坡地进行了稳定性评价,提出了科学合理的组合型滑坡处治技术,为斜坡路堤滑坡病害处治工程提供了一定的设计经验,处理措施具有重要的工程实用价值。     

青海扎哈公路滑坡稳定性评价及防治

介绍了青海扎哈公路K10滑坡的概况,综合分析了滑坡的性质,采用传递系数法对滑坡稳定性进行了评价,提出了设置抗滑桩和疏排水工程的建议。     

成品油管道穿越滑坡地段应力分析

成品油管道穿越山区滑坡地段时,受到滑坡推力的作用,易使管道产生过大变形而破坏。为探究此类管道安全问题并提出解决方案,使用应力分析软件CAESAR Ⅱ对某穿越滑坡地段的成品油管道进行应力及位移分析,得出其应力、位移分布,并分析纵向滑坡和横向滑坡对输油管道的影响。通过分析得出常规地段与滑坡地段的交界位置为输油管道的危险截面,且纵向滑坡对输油管道的应力及横向位移、纵向位移影响较大。     

抗滑桩治理滑坡的应用技术研究

本文通过闽江岸边XX县道边坡滑坡治理工程实例,深入探讨了抗滑桩的计算参数的选取,建立滑坡和抗滑桩的简化力学模型,采用传递系数法,给出了滑坡推力的计算方法,对桩位、桩间距的合理设置进行了阐述,并对桩长的合理确定做分析比较,同时对滑坡治理效果监测的方法进行描述.     

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.     

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.     

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。     

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。     

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。     

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.