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针对巢湖航道口门拦门沙问题,根据口门现场工程建设条件,采用现场试验、计算验算及效益分析方法,对疏浚淤泥充填管袋筑堤设计方案进行研究。现场充填试验结果表明2.8 m×1.6 m×0.6 m扁平管袋方案在脱水效率和堆叠稳定性方面较优;计算结果表明导堤设计方案的整体稳定性具有足够的安全储备,最大沉降发生在堤心处,沉降量约为88 mm,堤心与堤脚沉降差约为15 mm,且设计波浪荷载下设计方案满足袋间抗滑稳定要求;效益分析表明淤泥土工管袋脱水筑堤方案可节约成本20%以上,且具有较大的环境和社会效益。 相似文献
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大圆筒结构作为水运工程新型结构形式,受力机理复杂,行业内对其认识较为有限。为研究大圆筒结构整体稳定性和水平变位的影响因素,采用PLAXIS 3D软件模拟大圆筒结构在不同地基土密度、强度、刚度,不同筒内回填料密度、强度以及不同埋深工况下整体稳定性和水平变位。结果表明,大圆筒结构整体稳定性随地基土密度、摩擦角和埋深的增大而增加,随回填料密度增大而降低,与回填料摩擦角和地基土弹性模量无关;大圆筒结构水平变位随地基土密度、摩擦角、弹性模量和埋深的增大而减小,随回填料密度的增大而增大,与回填料摩擦角无关。该成果可为大圆筒结构设计提供参考依据。 相似文献
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分析讨论了土工织物加筋垫层稳定性作用机理,总结了目前加筋垫层稳定安全系数计算方法,并采用原规程法和规范中的新方法对一项现场足尺破坏试验和5项海堤工程实例分别进行了计算分析,结果表明:土工织物加筋垫层可以约束堤体和地基土的侧向变形,减少地基的沉降和不均匀沉降,提高边坡的整体稳定性。采用分担系数的方法计算边坡稳定与实际结果较为吻合。 相似文献
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新型空心方块斜坡堤结构在长江口深水航道治理工程中的应用 总被引:1,自引:0,他引:1
针对长江口N IIC-1区段特殊的工况和地质条件,采用了创新的空心方块斜坡堤结构。在满足抗浪稳定性要求的同时,利用空心块体自身及块体间的大空隙率减轻堤身自重应力,满足了地基承载力和堤身整体稳定性要求。开发了空心方块斜坡堤结构全套施工工艺。该堤段工程已顺利建成,并经受了台风浪的考验,使用效果良好。文章对这一新型结构诞生的背景、创新思路、开发及实践过程和工程效果作了简要介绍。 相似文献
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《船舶与海洋工程学报》2014,(1):126-126
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. 相似文献
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《船舶与海洋工程学报》2014,(2)
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. 相似文献
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《船舶与海洋工程学报》2014,(4)
正St.John's,Newfoundland,Canada,May 31-June 5,2015 OMAE2015 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; 相似文献
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联合作战计划和执行系统 总被引:2,自引:1,他引:1
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。 相似文献
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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. 相似文献
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《船舶与海洋工程学报》2014,(1)
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. 相似文献
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《船舶与海洋工程学报》2014,(2)
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. 相似文献
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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). 相似文献
The answer is China South Port Group (Hong Kong, Shenzhen and Guangzhou). 相似文献
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Gunnar Alexandersson Staffan Hultén Frode Longva 《Research in Transportation Economics》2010,29(1):212-218
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. 相似文献