西安地铁二号线地裂缝段防水设计探讨

地裂缝是西安市地铁工程建设面临的重大难题,其活动将给地铁的防水带来很大的压力.结合西安市地铁二号线地裂缝段处置措施的课题研究,对地裂缝的成因及特点进行了说明;根据地裂缝段地铁的结构设置情况和地裂缝的特点,提出了GINA止水带法、可卸式管片拼装双层结构法和管中管法等三种具体的防水方案.     

The impact of climate change and weather on transport: An overview of empirical findings

This paper presents a survey of the empirical literature on the effects of climate change and weather conditions on the transport sector. Despite mixed evidence on many issues, several patterns can be observed. On a global scale especially shifts in tourism and agricultural production due to increased temperatures may lead to shifts in passenger and freight transport. The predicted rise in sea levels and the associated increase in frequency and intensity of storm surges and flooding incidences may furthermore be some of the most worrying consequences of climate change, especially for coastal areas. Climate change related shifts in weather patterns might also cause infrastructure disruptions. Clear patterns are that precipitation affects road safety by increasing accident frequency but decreasing severity. Precipitation also increases congestion, especially during peak hours. Furthermore, an increased frequency of low water levels may considerably increase costs of inland waterway transport. Despite these insights, the net impact of climate change on generalised costs of the various transport modes are uncertain and ambiguous, with a possible exception for inland waterway transport.     

复杂地层地铁旁通道冻结孔施工技术

在复杂地层中,对地铁旁通道采用水平冻结法施工是一种有效手段,而冻结孔施工又是旁通道工程的关键工序之一.结合上海地铁十一号线祁连山-真南路站区间旁通道施工实例,介绍了含承压水的砂性土复杂地层中旁通道冻结孔的施工技术,包括壁后预注浆加固、冻结孔开孔以及夯管等技术,对类似地质条件下旁通道冻结孔施工具有一定的参考价值和指导意义.     

Severity of injury resulting from pedestrian–vehicle crashes: What can we learn from examining the built environment?

This paper examines the impact of personal and environmental characteristics on severity of injuries sustained in pedestrian–vehicle crashes using a generalized ordered probit model. The data covers 2000–2004 of pedestrian–vehicle crashes taken from police incident reports for Baltimore City and supplemented with local land use, urban form and transportation information specific to the individual crash locations. The results on personal and behavioral variables confirm previous findings. Women pedestrians involved in crashes tend to be injured less frequently than their male counterparts; children have an increased likelihood of sustaining injuries and older persons are more likely to be fatally injured. Pedestrians who cross against the traffic signal, are not in a crosswalk and are involved in a crash after dark are associated with greater injury risk. Of the built environment policy variables of interest, transit access and greater pedestrian connectivity, such as central city areas, are significant and negatively associated with injury severity. These results suggest that the environmental conditions should be given more scrutiny and be an important consideration when evaluating and planning for pedestrian safety.     

小净距隧道洞口通风交叉污染的数值分析及工程处治措施

在小净距隧道通风过程中,会出现排出的污染空气被吸人到邻近隧道中的交叉污染,严重影响隧道通风的性能和效率.文章以北固山隧道洞口段及隧道外空气域为分析对象,采用k-ε双方程紊流模型及组分传输方程组,借助Fluent软件,模拟不同速度自然风,针对现有洞口设计、洞口外设置中隔墙以及出口施做明洞3种情况,研究隧道洞口以外污染物扩散对邻近隧道的影响.研究表明:隧道洞口接一段距离的明洞,对缓解通风交叉污染效果是非常明显的.     

大体积混凝土凝固过程中的温度控制

进行大体积混凝土施工时必须根据混凝土水化热的具体情况,配备相应的监控系统—混凝土温度测试系统,对大体积混凝土凝固过程中的水化热进行实时温度检测,并对凝固过程进行全程检测和控制,采取相应的控制措施。     

基于公理设计的捷联导航系统设计方法

按照公理化设计原理,设计公理为设计者提供了一种设计指导框架。在此框架的指导下,大大降低了系统设计的复杂度,由此提高了系统的设计质量,缩短了系统的开发周期。本文应用公理化设计理论,采用结构模块化设计原则,对捷联式惯性导航系统的设计过程进行分析,给出了捷联式惯性导航系统的功能需求与设计参数间的映射与分解过程。结果表明,设计的分解过程是合理的,满足独立性公理。     

再论油船修理中的安全管理

列举了近十年间油船修理爆炸事故案例,分析了油船爆炸事故频发现象,进一步探讨了油船爆炸事故成因,提出了油船修理应遵循的步骤。     

马鞍山市乡镇渡船更新改造设计

渡船的适航性能是渡运安全的保障,渡船的更新改造是渡口渡船专项治理工作的重点。通过对马鞍山市内河码头、航道以及渡运情况的分析,设计出安全、适用的更新船型。