成层地基土在列车运行时的振动响应分析

以列车运行时的轨道-地基系统为对象,将轨道-地基系统简化为半无限地基及成层地基上的弹性地基梁模型,基于离散波数法推导了轨道和地基土的位移函数计算公式,并考虑了轨道和地基协同作用时的影响.比较了轨道、荷载自振频率、荷载移动速度、地基土模型等不同因素对地基土变形的影响,得到了一些有益的结论.     

多种地基处理方法在复杂地基加固中的综合运用

为有效提高复杂地基的承载力和减小残余沉降,运用多种地基处理方法对天然地基和回填层地基进行了充分处理,某些地基处理技术达到国内领先水平。     

地基的动力响应分析

以列车运行时的轨道-地基系统为对象,将轨道-地基系统简化为成层地基上的Winkle梁模型,对移动荷载作用引起的地基的动力响应进行了分析,得到了地基土的位移函数.     

轨道-地基系在移动荷载作用下的协同工作分析

以高速列车运行时的轨道-地基系统为对象,将轨道-地基系统简化为半无限地基及成层地基上的Winkle梁模型,对高速移动荷载作用下梁-地基系统的协同工作进行了分析,得到了轨道与地表面的动力响应.     

某矿料堆场地基失稳原因分析

对东南沿海某矿料堆场地基失稳原因进行了计算分析,堆场地基处理采用低强度素混凝土桩结合加筋褥垫层的 复合地基处理方法,指出了地基失稳的主要原因,以及今后对大面积堆载采用刚性桩复合地基设计中应注意的问题。     

组合型水泥粉煤灰碎石桩(CFG桩)复合地基在深厚软基处理中的应用

在深厚软土地基(fak≤100 kPa)上建造储罐等建筑物,承载力要求高、不均匀沉降变形要求严,若采用单一CFG桩复合地基加固,可能导致桩距过小或桩长太长,需要采用组合型复合地基,CFG桩+振冲碎石桩复合地基是组合型复合地基的一种。根据CFG桩+碎石桩组合型复合地基的加固机理,分析了其受力特性以及CFG桩和碎石桩的作用,研究表明CFG桩对提高地基承载力和减小沉降起控制作用。基于优化理论,建立了组合复合地基的优化设计方法。通过工程实例讨论了组合复合地基的优化设计方法,结果表明:复合地基的承载力、沉降量和经济效益均满足工程要求。     

许昌热电厂工程CFG桩原体试验的分析研究

原体试验是检验地基处理方法对场地条件的适应性及实际效果、优化桩设计重要手段。通过对试桩的桩身完整性、单桩承载力、桩体试块强度、桩间土承载力、复合地基承载力等多项试验分析,比对了地基处理前后地基土工程指标变化、承载力理论计算值与实际测试结果差异;研究了复合地基桩土应力变化;验证了地基处理方案的可行性,为工程桩优化设计提供了依据。     

土工格栅在港区地基处理中的应用

根据港区软土地基处理的施工实际,对不同类型的处理方法作了比较,并以天津港南疆港区为例,对土工格栅处理软土地基的设计及施工作了介绍,结果表明该法处理软土地基施工简便、工期短、经济效益明显,对提高地基承载力、增加地基整体稳定性和控制沉降作用显著。     

刚性桩复合地基及其设计应用

本文简述了刚性桩复合地基的特性及其原理,以某建筑地基设计为例,综合考虑后确定采用沉管夯扩桩复合地基方案,对其竖向承载力特征值、地基沉降进行了计算分析,实现其设计应用。     

运用计算机技术对软基处理检测的案例

文中运用计算机技术分析了安徽省芜湖市三山港区软土地基处理工程检测的实例,系统的阐述了施工工艺步骤,初步从理论上分析了该工艺处理填砂土时的地基固结过程,运用计算机技术,针对本地区软弱地基的条件,采用有限元法分析塑料排水板结合深井降水＋强夯地基加固理论,将夯击的能量与荷载拟静力法等效成静荷载。利用ANSYS分析其地基变形云图。检测结果表明：采用（塑料排水板结合深井降水＋强夯）处理后,复合地基密实度提高,地基承载力和工后沉降满足设计要求,因此该方法可用于后期大面积地基处理。     

33rd International Conference on Ocean,Offshore and Arctic Engineering （OMAE2014）

正San Francisco,California,June 8-13,2014.OMAE 2014 is the ideal forum for researchers,engineers,managers,technicians and students from the scientific and industrial communities from around the world to:·meet and present advances in technology and its scientific support;·to exchange ideas and experiences whilst promoting technological progress and its application in industry·to promote international cooperation in ocean,offshore and arctic engineering.In line with the tradition of excellence of previous OMAE conferences,more than 900 technical papers are planned for presentation.Outreach for Engineers Specialty Forum This Specialty Forum is designed for students and professionals who may not be familiar with the Ocean and Offshore industry,as well as those who have just recently specialized in this field.     

Errata

正In the paper"Influence of Fouling Assemblage on the Corrosion Behaviour of Mild Steel in the Coastal Waters of The Gulf of Mannar,India"in Vol.12,No.4,Page:509,References were lost,and the two authors’biographies were identical.The correct text is shown below.We apologize to the authors and our readers for any inconvenience caused by the errors.     

Journal of Marine Science and Application 2014 Sum. Contents

正~~     

联合作战计划和执行系统

全球指挥控制系统(GCCS)实施当前美国海军网络中心战信息基础设施的联合计划网络。联合作战计划和执行系统(JOPES)支持GCCS实现联合计划。JOPES有两类计划：时间不限的精密预案计划生成作战计划、方案计划或职能计划；时间敏感的危机行动计划生成作战命令或战役方案。前者在和平时期创建的作战计划是后者的计划基础，加速应付危机的能力。     

Recent progress on wave induced loading measurements in warships

Recent measurements of wave induced hull strain and flexure in RN warships are presented together with the derivation of the current design criteria for extreme hull girder bending loads. The history of the development of the shipboard instrumentation used is given and recent developments to improve the quality and ease of analysis of the data are described. An unexpectedly high transverse asymmetry in the longitudinal strains measured in destroyers is shown to be the result of a combination of vertical and lateral bending in oblique seas. Finally recent theoretical comparisons between the loading of Deep-Vee hulls and conventional UK rounded bilge hulls are presented which demonstrate the higher loading experienced by this type of hull form.     

The 11th International Conference on Hydrodynamics (ICHD 2014)

正19–24 October 2014 SingaporeCONFERENCE THEMES The overall aim of the ICHD Conference is to provide a forum for participants from around the world to review,discuss and present the latest developments in the broad discipline of hydrodynamics and fluid mechanics.The first International Conference on Hydrodynamics(ICHD)was initiated in 1994 in Wuxi,China.Since then,9 more ICHD conferences were held subsequently in Hong Kong,Seoul,Yokohama,Tainan,Perth,Ischia,Nantes,Shanghai and St Petersburg.Evidently the ICHD conference has become an important event among academics,researchers,engineers and operators,working in the fields closely related to the science and technology of hydrodynamics.The 11th ICHD will be held in Singapore in 2014.     

第十二届深水操作会议和展览会(英文)

正November 4-6,2014Moody Gardens HotelConvention Center/Galveston,TX The Deepwater Operations Conference and Exhibition is celebrating its 12th anniversary this year.This growing event will continue the tradition of excellence in addressing operational challenges involved in developing deepwater resources.We will return to the Moody Gardens Hotel and Convention Center on November 5-7,2014 in Galveston,Texas.     

Eastbound or westbound ?

In terms of equal sailing distances, where is the inflexion when ships depart from ports in the Asian Continent to New York via Suez and/or Panama？
The answer is China South Port Group （Hong Kong, Shenzhen and Guangzhou）.     

Impact of regulation on the performances of long-distance transport services: A comparison of the different approaches in Sweden and Norway

Despite the many socio-economic similarities between Sweden and Norway, differences in jurisdiction, organisation, cooperation, and financing of long-distance passenger train and coach services have led to the development of four distinctively different ways of serving the markets. This paper describes how the train and coach markets have developed in the two countries, with emphasis on regulatory and industrial structure and a couple of performance variables.Looking at passenger rail, both countries separated infrastructure from operation over a decade ago. However, while Norwegian rail is characterised by an almost monopoly supplier, rail services in Sweden are partly decentralised to the responsibility of county authorities and are widely subjected to competitive tendering. The rest of the network is about to be opened up for on-the-track competition. Swedish Rail (SJ) has spent the last decades consolidating its core business (passenger rail) and sold out its other businesses. In contrast, the Norwegian state rail (NSB) has expanded its business to become a major bus operator and property owner, with extensions also into the Swedish market.The coach industry was more recently deregulated in both countries. The Swedish coach market is dominated by privately owned companies operating services to and from Stockholm. In Norway, state-owned NSB is a major coach operator on medium distance routes, and is also the largest partner of Nor-Way Bussekspress which totally dominates long-distance coach services. Further, the Norwegian coach market is characterised by cross-ownership and cooperation which has enabled an extensive route network which covers most of Norway.We find distinct differences in achievements in the two modes and in the two countries. Swedish rail services have succeeded in winning market shares and in renewing and developing both infrastructure and service levels to a greater extent than the Norwegian model. On the other hand, the Norwegian coach market seems to be more developed and efficient compared to its Swedish counterpart.The paper concludes with a discussion on the possible links between the different approaches and the performance observed, with the aim to stimulate further and more detailed research on some important issues.     

某海港码头的撞损修复

依据码头撞击受损区域调查检测结果,对受损构件提出合理的修复方案,为码头的安全运行提供保障。