软土路基真空-堆载预压沉降变形特征及卸载时机研究

针对处于沿海滩涂软土路基之上的铁路专用线,采用真空-堆载联合预压的方案加固路基地基,开展了大量的表层沉降、孔隙水压力、分层沉降等观测项目.据实测资料,分析了地基表面的沉降规律,并考虑了地基分层沉降与孔隙水压力的变化规律,全面揭示了整个地基地层的沉降变化特征.运用双曲线合理地预测了工后沉降,且推算出地基整体的固结度;采用工后沉降与地基固结度建立卸载时机判别标准.结果表明:真空-堆载联合预压的处理方案有效地加固了沿海滩涂软土地基;全面考虑地基表面沉降、分层沉降及孔隙水压力,并采用工后沉降与地基固结度相结合的方式,为堆载预压的卸载时机判别标准研究提供了一种新的思路.     

海滩围垦区现浇箱梁满堂支架的地基承载处理

针对金塘大桥镇海侧引桥海滩围垦区现浇梁满堂支架的施工,采用试验的方法对地基表层填土硬化和钢管桩两种地基承载处理设计方案进行对比。结果证明：采用表层填土硬化方案,地基在荷载下持续沉降且不稳定;采用钢管桩地基承载处理方案,稳定、安全,满足施工要求。     

汽车转向拉杆接头总成试验台的开发

汽车转向拉杆接头总成是汽车转向系中的主要部件。其强度和可靠性直接关系汽车的安全性能。开发的接头总成寿命试验台,工作可靠,能满足多种型号转向拉杆接头的测试要求。     

爆破网路设计在毗邻城镇滩险施工的应用

毗邻城镇滩险爆破施工一直是各方关心的问题,尤其附近有文物建筑更是如此。爆破施工主要解决施工安全与工程施工质量、工程综合效率之间的矛盾,并注重生态环境保护。针对毗邻城镇滩险施工中的诸多不利因素,探讨了爆破施工理论、爆破网路设计技术、施工工艺和操作方法,结合赤水河具体滩险的工程实例,指出爆破施工中应注意解决的主要问题,重点对主要爆破技术参数进行分析研究,实践结果达到了安全控制、质量控制、资源节约、成本控制的目的。     

复式航道的淤积计算

利用水流泥沙运动基本理论，分析了水流经过复式航道时的流速、流向变化，建立了复式航道的泥沙淤积计算公式，方法简单实用，可供工程应用。     

A Review of Beach Bye-Law Usage in Supporting Coastal Management in Ireland

Coastal areas are commonly the focus of a range of human activities and uses. Beaches are one example of multi-use coastal environments, accommodating activities linked to leisure and recreation, amenity, conservation and business, often simultaneously. Ireland is no different in this regard, as its beach resources provide a range of goods and services of societal value. Ireland has 16 coastal counties and their associated local authorities have a beach management remit, a role that can present a number of challenges. The use of beach bye-laws is one option to support management of beach environments by local authorities. Local authority personnel tasked with beach management from each coastal local authority were surveyed to assess the actual and potential role of beach bye-laws in contributing to more effective management of beach environments and to broader coastal management. Usage of beach bye-laws varied across local authority areas and evidence suggested that the efficacy, use, and implementation of beach bye-laws differed from county to county. Beach bye-laws offer potential but interaction with other initiatives as part of a wider program for coastal management may yield improved results.     

The Economics of Using Ocean Observing Systems to Improve Beach Closure Policy

Beach closure policies in the United States suffers from two shortcomings. Type I errors, in which clean beaches are closed, results when managers resort to extensive beach closures because they are unsure of the spatial extent of water contamination. Type II errors, in which contaminated beaches remain open, occur because the time from sampling to public notification can be between two and nine days. Coastal Ocean Observing Systems (COOS) could reduce the impact of both Type I and II errors. The COOS could reduce the spatial extent of beach closures by better predicting the fate of contaminants in coastal waters. An improved COOS also could reduce the time from sampling to public notification of contamination events. I estimate the lost recreational value associated with Type I errors (unnecessary closures) and the public health costs associated with Type II errors (unnecessary exposure to waterborne illnesses) for beaches in Southern California.     

Green-Naghdi theory, part A: Green-Naghdi (GN) equations for shallow water waves

In this work,Green-Naghdi (GN) equations with general weight functions were derived in a simple way. A wave-absorbing beach was also considered in the general GN equations. A numerical solution for a level higher than 4 was not feasible in the past with the original GN equations. The GN equations for shallow water waves were simplified here, which make the application of high level (higher than 4) equations feasible. The linear dispersion relationships of the first seven levels were presented. The accuracy of dispersion relationships increased as the level increased. Level 7 GN equations are capable of simulating waves out to wave number times depth . Numerical simulation of nonlinear water waves was performed by use of Level 5 and 7 GN equations, which will be presented in the next paper.     

长江中下游航道整治软体排护滩带结构优化设计

对目前在长江中下游航道整治护滩（底）工程中广泛采用的系结混凝土块压载软体排护滩带的运用情况进行了实地调查与实测资料分析,并通过模型试验研究,对其易出现破坏的地方和引起破坏的主要原因,以及防止破坏或出现局部破坏后的修复工程措施进行系统研究;从保持所护滩体功能基本不变的观点出发,提出了确定护滩带间距和宽度的研究途径;同时提出了护滩工程结构设计优化措施。     

开发横沙东滩，建设上海发展新基地的构想

横沙东滩位于长江出海口,南临12.5 m北槽深水航道,北贴l0m北港规划航道,东朝大海,西连长兴岛,可成陆面积大,是一个集“区位、土地、岸线、航道”等众多优势资源于一身的区域.结合上海发展机遇和发展面临资源挑战的情况,以服务于上海国际航运中心建设和临港经济开发为主,提出开发横沙东滩、奠定上海未来发展的新基地的构想,并简要阐述其开发功能及构想方案.