成球黏性土水力输送阻力特性计算方法

密实黏性土在管路水力输送过程中会形成球块状,成球黏性土水力输送计算是国内外疏浚界的难题。立足浆体输送理论,以大型绞吸式挖泥船施工数据为基础,对成球黏性土的管路输送阻力特性进行研究,分析已有各种土质浆体输送理论用于成球黏性土管路阻力特性计算可能产生的偏差,并根据分析结果对成球黏性土输送计算公式进行研究,进而提出可用于成球黏性土输送的计算公式,供工程界与理论界参考。     

耙吸式挖泥船最佳装舱时间的确定

耙吸式挖泥船溢流施工作为疏浚施工重要的方法之一,其施工效率的提高与装舱时间有关.确定最佳装舱时间及生产模式,需要对施工区土质、装舱时间、装舱效率、施工区域漂流出的土方量等要素进行分析计算,并加以工程实践验证.依据确定的最佳装舱时间组织生产施工,可以提高施工效率和经济效益.     

绞吸挖泥船吹填管线泥沙分离施工工艺

肯尼亚拉姆港疏浚及吹填项目中吹填区须进行临时围埝施工。由于当地石料价格较高,陆地砂源少,因此只能通过大型绞吸挖泥船采用水下取砂的方式进行备砂。而施工区土质为黏土混砂,且含有大量贝壳,砂层较薄,取砂效率极低。为此,研制一种管线用滤砂装置,该装置可将砂与其他废土分离,并分别吹填至不同区域。该大型绞吸挖泥船黏土与砂混挖分离施工技术,解决了砂与黏土球及贝壳分离的难题,保证了砂袋充填砂的质量,提高了充填砂袋施工效率,大大降低了施工成本。     

连云港赣榆港区一期工程绞吸船施工工艺优化

连云港赣榆港区一期工程土质为5、6级黏土,绞吸船在施工该土质时受黏土黏性的影响,容易糊绞刀且输送极为困难,施工流速、浓度控制不好就会存在堵管的风险,严重影响船舶正常施工。重点对绞吸船的挖掘方式和输送理论进行研究,通过改变切泥厚度、进尺、浓度、流速等参数,解决上述问题。     

新海鳄轮挖吹硬塑性亚粘土施工分析

通过对新海鳄轮绞吸挖泥船在连云港港庙岭三期突堤码头疏浚工程挖掘与泵送硬塑性亚粘土施工情况进行分析,进一步了解了泥泵泵送硬塑性亚粘土的流态和参数变化,对绞吸船在挖吹粘性土领域的研究具有借鉴意义。     

耙吸船犁齿软格栅挖掘硬黏土新工艺应用

耙吸式挖泥船在硬黏土底质施工中,存在堵耙、闷耙等问题,生产效率较低。介绍天航局耙吸挖泥船在鲅鱼圈港25万吨级航道施工开挖硬黏土时,成功研制犁齿、软格栅的施工方法,有效解决堵耙、闷耙等问题,综合生产能力提高60%以上。     

天津港区土质附着力与物理力学指标关系及应用案例

从天津港区易糊刀具黏性土质特性出发,指出决定易糊刀具黏性土质的附着力关键指标为含水率、塑性指数和凝聚力。基于大量的易糊刀具土质室内土工试验资料,应用数理统计方法,对附着力与关键指标含水率、塑性指数和凝聚力之间的相关关系进行了研究分析。结果表明:1)附着力、含水率和塑性指数经验公式的回归系数均在0.8以上,具有较高可靠性;2)天津港航道区域在天然状态下的黏性土质附着力约为塑性指数的3倍。针对具体黏性土质疏浚施工案例,经过附着力和关键指标值的比对,判断出挖掘该状态黏性土具有糊刀具的可能性。     

处于无潮区无潮点特殊海域的疏浚工程施工

挖泥船在无潮区无潮点的海域施工,因无潮位、流速大、土质硬等特点和特大风浪袭击的风险,常规的疏浚工程变成了具有危险性的特殊工程,通过采取适当措施,顺利完成了施工任务.在工程实施过程中,不但积累了宝贵的施工经验,还观测到粉砂液化现象,为港口选址提供了关键性的参考依据.     

耙吸挖泥船施工效率预测模型研究

耙吸挖泥船挖掘生产率影响因素复杂,根据耙吸挖泥船耙头挖掘过程中破土原理确定施工效果的影响因素。在此基础上,考虑土质分级情况与挖泥船耙头水下环境等因素,建立一个耙吸挖泥船施工效率预测模型,结合实际施工经验设定合理的模型计算参数,为类似项目开展施工效率测算、船舶选择提供了一种计算依据。     

挖掘机在疏浚内河航道硬土质浅滩中的应用

将1艘绞吸式挖泥船配1台挖掘机,改装成1艘反铲式挖泥船。该挖泥船在疏浚内河硬土质航道中,有操作简便,土质适应能力强,可挖掘风化岩等硬土质优点。     

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。