长江中游界牌河段已建航道整治工程效果分析

界牌河段航道整治工程实施后,航道条件明显改善,如河段中、洪水河势得到了初步控制,航道尺度和流速、流态基本达到了设计标准。由于整治工程实施时机偏晚,工程实施后过渡段位置偏下、河道过宽,主流在鱼嘴前沿摆动空间较大,过渡段航槽不稳定,主支汊易位。在两汊转化的过程中,过渡段进口易出浅。同时,河道内螺山边滩未得到有效控制,在螺山边滩下移过程中,鱼嘴工程受强烈顶冲,其稳定受到威胁,同时鱼嘴部分功能发生了转化,由防守型变为具有一定挑流作用的整治建筑物。     

长江上游碛头坝整治经验总结

碛头坝工程是长江上游整治分汊河道应用较广的整治建筑物形式之一。本文主要介绍分析了在长江上游航道整治历史中碛头坝工程的作用、主要布置形式以及整治效果,提出了有待进一步研究的问题。     

长江下游江心洲河段航道整治工程设计综述

针对长江下游江心洲水道的航道问题,进行了河床演变及碍航特性分析,采用模型试验等多种手段合理确定了工程平面布置方案,并在工程结构设计中,因地制宜采用长江航道整治目前较为先进、成熟的护岸和护滩结构形式,可为类似航道整治工程设计提供参考。     

长江南京以下深水航道和畅洲水道整治效果分析

为达成长江口深水航道上延至南京的目标,长江南京以下12.5 m深水航道二期工程和畅洲水道实施航道整治工程,在左汊采用潜堤的结构形式,减小左汊分流比,改善右汊航道水深条件。本文根据和畅洲水道航道整治工程实施后的实测数据,与设计阶段数物模预测结果进行对比分析,综合分析工程前后在滩槽变化、河床容积、流场变化、分流分沙变化等方面的实现情况。结果表明:工程实施以后,左汊潜堤上游侧主要呈淤积状态,潜堤下游侧呈冲刷状态。右汊分流比大幅提高,河槽大面积刷深,航道维护量非常小。工程达到了预期的航道整治目标,工程治理方案合理,航道整治效果显著,可为长江中下游潮汐分汊河段航道整治提供参考。     

防冲墙结构在航道整治工程中的应用

在分析航道整治工程滩头护滩带守护结构优缺点的基础上,结合长江中游嘉鱼至燕子窝河段航道整治工程的需要,提出了新型的滩头守护结构形式——防冲墙,并进行了实际应用。     

北江砂袋填芯试验坝施工方法

采用土工织物缝制砂袋实施航道整治工程,比传统的抛石丁坝形式具有取材方便、施工简单的特点,效益显著。本文通过分析砂袋填芯坝坝体的施工方法,研究其在航道整治工程中的应用。     

赣江泉港滩群Ⅲ级航道整治工程方案对比及整治效果分析

为了提高樟树至南昌河段的航道等级,满足快速发展的航运需求,在分析赣江下游重点浅滩—泉港滩群河床演变特点的基础上,开发了河工模型,利用整治丁坝、疏浚、护岸等工程措施,对该河段2个Ⅲ级航道整治工程的设计方案进行分析,对比了2个不同整治方案的效果,并优化了航道整治工程的布置。该整治工程于2006—2007年实施。对航道竣工图的分析表明:该河段的碍航浅区消失,达到了设计的航道维护尺度,航道整治效果明显,为全河段航道整治工程设计提供了科学借鉴。     

动态管理在赣江航道整治工程中应用策略分析

赣江航道整治工程作为动态工程,在航道整治工作中受到多方面因素的影响,航道整治工程内的局部河段边界条件及河床泥面条件都在时刻发生改变。为了确保赣江航道整治工程的预期整治目标得以实现,务必及时根据航道实际现状调整航道整治方案及整治内容,在赣江航道整治过程中应用动态管理策略具有显著的必要性。本文结合赣江现状及动态管理内容,分析动态管理在赣江航道整治工程中应用的必要性,进而分析赣江航道整理工程中动态管理应用策略。     

长江下游东流水道航道整治工程效果分析

东流水道是长江下游著名的浅险水道,实施航道整治工程前,该水道枯水期航道条件恶劣,航道浅情和船舶事故频发。东流水道航道整治工程稳定了该水道河势格局,改善了该水道的航道条件。本文在介绍东流水道航道基本情况和整治工程概况的基础上,分析了东流水道工程前后河势、航道变化以及整治后实船适航试验效果,对东流水道整治工程完工四年来体现出的总体效果进行了评价。     

浅析小流量山区河流航道尺度的论证方法

航道整治尺度的确定是航道整治工程可行性论证的重要内容之一,针对山区小流量河流,提出了水力计算法、滩情分析法、类比法,来确定合理的航道尺度。并以赤水河航道整治工程为实例进行了计算和综合分析,工程实践表明提出的计算方法是有效的。     

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.     

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.     

Catalyzing Coastal Management in Kenya and Zanzibar: Building Capacity and Commitment

Site-based projects were initiated in Chawka Bay-Paje, Zanzibar, and Nyali-Bamburi-Shanzu, Kenya, to demonstrate the benefits of an integrated coastal management (ICM) approach for addressing coastal issues such as tourism development and enhancement of resource-dependent village economies in eastern Africa. A two-year, multidonor project used three primary strategies to make rapid, but sustainable, progress toward ICM. These included using interagency government teams for ICM planning, adopting an internationally recognized framework for ICM as a project ''road map,'' and explicitly incorporating capacity-building strategies into all aspects of the project. Within two years, integrated ICM action strategies, prepared through participatory processes, were being implemented at both sites, and both teams were working to expand the scale and scope of ICM in their nation. More importantly, the project helped create committed, capable, interagency groups that continue to work together to address urgent ICM issues.     

A simplified method for reliability- and integrity-based design of engineering systems and its application to offshore mooring systems

This paper presents a simplified method for the reliability- and the integrity-based optimal design of engineering systems and its application to offshore mooring systems. The design of structural systems is transitioning from the conventional methods, which are based on factors of safety, to more advanced methods, which require calculation of the failure probability of the designed system for each project. Using factors of safety to account for the uncertainties in the capacity (strength) or demands can lead to systems with different reliabilities. This is because the number and arrangement of components in each system and the correlation of their responses could be different, which could affect the system reliability. The generic factors of safety that are specified at the component level do not account for such differences. Still, using factors of safety, as a measure of system safety, is preferred by many engineers because of the simplicity in their application. The aim of this paper is to provide a simplified method for design of engineering systems that directly involves the system annual failure probability as a measure of system safety, concerning system strength limit state. In this method, using results of conventional deterministic analysis, the optimality factors for an integrity-based optimal design are used instead of generic safety factors to assure the system safety. The optimality factors, which estimate the necessary change in average component capacities, are computed especially for each component and a target system annual probability of system failure using regression models that estimate the effect of short and long term extreme events on structural response. Because in practice, it is convenient to use the return period as a measure to quantify the likelihood of extreme events, the regression model in this paper is a relationship between the component demands and the annual probability density function corresponding to every return period. This method accounts for the uncertainties in the environmental loads and structural capacities, and identifies the target mean capacity of each component for maximizing its integrity and meeting the reliability requirement. In addition, because various failure modes in a structural system can lead to different consequences (including damage costs), a method is introduced to compute optimality factors for designated failure modes. By calculating the probability of system failure, this method can be used for risk-based decision-making that considers the failure costs and consequences. The proposed method can also be used on existing structures to identify the riskiest components as part of inspection and improvement planning. The proposed method is discussed and illustrated considering offshore mooring systems. However, the method is general and applicable also to other engineering systems. In the case study of this paper, the method is first used to quantify the reliability of a mooring system, then this design is revised to meet the DNV recommended annual probability of failure and for maximizing system integrity as well as for a designated failure mode in which the anchor chains are the first components to fail in the system.     

含裂纹钢板复合材料修补强度和刚度数值分析

用ANSYS有限元分析软件对复合材料补片修复含边裂纹和中心裂纹钢板的强度和刚度进行了数值分析.引入相对刚度的概念,研究了钻有止裂孔裂纹的长度对损伤钢板相对刚度的影响,分析了损伤钢板刚度复合材料贴片修补效果;引入屈服载荷提高率的概念,分析了损伤钢板强度的修复效果.     

混凝土道路、堆场面层裂缝的产生与防治

从混凝土道路、堆场的各个结构层分析裂缝产生的原因,并针对性地说明预防措施,阐述裂缝维修方法。     

利比亚米苏拉塔市萨瓦瓦区5000套住宅项目中心区设计

从确定符合项目实际情况的设计原则入手,通过利比亚米苏拉塔市萨瓦瓦住宅区中心区总体布局和建筑设计两个方面的设计实践,探讨了"传统、现代与文脉"这一当今时代无法回避的文化议题。并且针对具有鲜明文化、宗教和气候特征的建筑设计的特点、方法与风格进行了总结,为今后的实践提供借鉴。     

恶劣电磁环境下PLC控制系统抗干扰技术研究

该文结合工程实践,研究了某型船模PLC控制系统抗干扰技术。依据干扰产生的原因,分析了系统干扰的来源,并提出了抑制干扰的具体措施。通过硬件和软件的优化设计,提高了控制系统抗干扰能力。实践证明,经过优化设计的PLC控制系统运行安全,稳定,控制效果得到明显提高。     

沉箱重力式码头施工期间沉降位移观测与分析

介绍某码头工程3万吨级码头和5000吨级码头施工期间的沉降变位观测过程及对观测数据的分析,为类似工程提供参考。     

分油机系统模拟仿真设计

针对使用实际分油机系统进行教学与训练在安全和经济方面存在的制约因素.为帮助学员较快熟练掌握分油机系统的操控,采用VC++编程技术和数字仿真技术,结合数学建模,设计开发基于PC桌面的船舶分油机模拟仿真系统.仿真分析和应用结果表明:船舶分油机模拟仿真系统能够模拟实际分油机系统的操作控制过程,方便学员熟悉各种故障现象,熟练掌握船用燃油分油机的操作程序、操作要领和保养维护系统知识.