南京地铁三号线主动桩基托换工程设计

龙蟠南路高架桥是南京市南北向重要通道,交通繁忙。地铁三号线下穿位于雨花站至卡子门站区间,地铁隧道左线穿越龙蟠南路高架桥侵入桥台桩基;隧道右线穿越龙蟠南路高架桥侵入高填土路基挡土墙预制方桩,直接截取桩基对地铁盾构施工及桥梁结构本身受力存在安全隐患,需对其主动桩基托换处理。该文介绍了其工程设计。为维持高架桥正常通车,不中断交通,分别从劲性托换梁方案和承台补偿方案进行对比分析,优化选定了承台补偿方案,并对承台补偿方案的整体结构计算分析与设计作了论述,有效地解决了桥台主动桩基托换难题,具有较好的应用价值。     

某隧道塌方处治方案

简要介绍了某隧道在施工过程中由于地质结构发生变化,但是支护参数没有及时进行调整,支护过弱等原因造成隧道塌方。处理方案采用大管棚跟管钻进+注浆进行预加固,小导管超前支护后再开挖的方法进行处治,最终顺利地通过了塌方段。     

公路软土地基的勘察设计方案探析

软土地基的勘察设计方案是否合理,会直接影响到公路工程的整体质量.鉴于此,对公路软土地基勘察存在的问题进行分析,对公路软土地基的勘察设计方案进行选择,并提出软土地基勘察的处理方法,可为公路软土地基的勘察设计提供参考.     

高校旅游管理专业“两创”型人才培养模式的思考

经济和社会快速发展的知识经济时代给高等教育带来了前所未有的压力。旅游产业的迅猛发展对旅游人才的要求越来越高,人才培养模式改革势在必行。为适应经济全球化对旅游人才的高质量需求,本文结合五项修炼理论建构了高校旅游管理专业“两创”型人才培养模式体系,提出了“两创”型旅游人才培养模式的实施方案。     

Part 3. Multivariate road safety models: Future research orientations and current use to forecast performance

The third part of the state-of-the-art focuses on the future of road safety modeling and on conjectures concerning the evolution of national safety indicators. In the absence of econometric developments specific to road safety modeling, the research future must rely on pre-existing statistical procedures of econometrics applied to discrete/count and to aggregate data. In terms of contents, growing interest in the heterogeneity of road accident outcomes by category of victims could lead to treatments of this issue across research streams, say by top-down and bottom-up developments, but this speculation does not rest on extant adequate formulations of the issue of road user class and victim analysis. But understanding the time profile of aggregate national performance indicators is quite another matter.     

76000 t散货船半立体分段总组过程变形控制研究

针对76 000 t散货船机舱区半立体分段EZ31P(EG31P+EG32P)在船台总组过程中变形过大的问题,采用有限元数值仿真计算其实际支撑状态下的应力及变形情况,得到与现场测量较为一致的结果;通过改进总组支撑方案,控制分段弹性变形,并将方案应用到现场总组过程中,测量得到分段变形已控制到精度许可范围,为总组过程快速搭载奠定基础。     

上海油墩港航道整治工程东大盈船闸扩建方案研究

基于上海油墩港航道整治工程东大盈船闸扩建方案研究分析,通过对比不同的扩建方案,确定在现有船闸的东侧 新建船闸的方案,并解决了相关平面布置、水工结构等关键技术问题,为解决类似的碍航瓶颈问题提供一定的借鉴和参考。     

高速油缸的缓冲结构设计

高速油缸的运行速度极快,需要在行程末端进行缓冲,因此设计一种合理的缓冲结构十分重要。本文参考了4种经典的油缸缓冲结构,借鉴其优点,采用压力补偿方法保证缓冲过程中压力的稳定性,提出了一种通用的缓冲冲头设计方法,并采用Matlab仿真输出了油缸缓冲结构的冲头形线。     

Cargo Container Loading Plan Model and Solution Method for International Air Express Carriers

Abstract

In this article, a cargo container loading plan model is developed based on the operations of FedEx, the international air express carrier. The objective is to minimize total container handling cost, subject to related operating constraints. The model is expected to be a useful planning tool whereby international air express carriers such as FedEx can decide on container loading plans that will lead to lower operating costs, thus enhancing profits and market competitiveness. The model is formulated as a non-linear mixed integer program that is characterized as NP-hard. A solution method is then developed, with the use of the mathematical programming solver, CPLEX, to solve the problem efficiently. To evaluate the model and the solution method, we perform a case study using data from FedEx. The preliminary results indicate that the model and the solution method are both efficient and effective.     

LD管线的检验案例及问题处理

对某厂的LD管线进行全面检验时,发现该管线有严重的扭曲变形现象.在压力管道的全面检验中,这类现象非常罕见.经过现场宏观检验、材质光谱分析、超声波壁厚测定、焊缝渗透无损探伤、直管壁厚校核等检验项目后,确定为：管线在设计时未根据工艺状况设置补偿器,导致运行时由于较大温度变化产生非常大的热应力,造成管线扭曲变形及支架位移,形成应力集中.文中的案例分析给管道检验提供参考,确保化工生产安全运行.