Wave reflection and transmission by curtainwall–pile breakwaters using circular piles     

Kyung-Duck Suh  Hoo Young Jung  Chong Kun Pyun   《Ocean Engineering》2007,34(14-15):2100-2106

This paper presents a mathematical model which computes the hydrodynamic characteristics of a curtainwall–pile breakwater (CPB) using circular piles, by modifying the model developed for rectangular piles by Suh et al. [2006. Hydrodynamic characteristics of pile-supported vertical wall breakwaters. Journal of Waterway, Port, Coastal and Ocean Engineering 132(2), 83–96]. To examine the validity of the model, laboratory experiments have been conducted for CPB with various values of draft of curtain wall, spacing between piles, and wave height and period. Comparisons between measurement and prediction show that the mathematical model adequately reproduces most of the important features of the experimental results. The mathematical model based on linear wave theory tends to over-predict the reflection coefficient as the wave height increases. As the draft of the curtain wall increases and the porosity between piles decreases, the reflection and transmission coefficient increases and decreases, respectively, as expected. As the relative water depth increases, however, the effect of porosity disappears because the wave motion is minimal in the lower part of a water column for short waves.  相似文献   

钢材在海水—海气变换界面区的腐蚀行为     

侯保荣  西方篤  水流徹 《海洋与湖沼》1995,26(5):514-519

于1993年9月通过对241A，24KU，SS41三个不同钢种极化曲线的测定，对镜层本身的氧化还原电流的测定及X线分析，研究在海水一海气交换界面区锈层在腐蚀中所起的作用。结果表明，海一气交换界面区的钢由于锈层本身的氧化还原反应，其阴极电流均较裸钢为大，这说明锈层的还原反应起着重要作用．根据锈层本身的还原时间和还原电位，可以在某种程度上评价钢材本身耐腐蚀性能的好坏。  相似文献   

型钢高性能混凝土剪力墙恢复力模型研究     

李菲菲  梁兴文 《震灾防御技术》2010,5(3):299-308

在前人研究成果的基础上,本文通过对6个型钢高性能混凝土剪力墙荷载-位移滞回曲线的分析,得出了简化的三折线型恢复力模型,并提出各个特征参数的计算公式,计算值与与试验值较为吻合。滞回规则采用考虑刚度退化和强度退化的剪切滞变模型,为型钢混凝土剪力墙的弹塑性分析提供了依据。  相似文献   

过湿黄土砾石桩复合地基处理的试验研究   总被引：5，自引：3，他引：5  

彭小云  折学森  宫治国 《工程地质学报》2006,14(3):370-375

过湿黄土是指含水量较高的黄土。过湿黄土土体含水量高、饱和度大、压缩性高以及土体浸水后强度显著降低。其性质随土体含水量变化而变化,给工程建设带来一定影响。本文结合某高速公路过湿黄土地基砾石桩复合地基的工程实践以及原位测试,分析加固前后复合地基的强度和变形,研究过湿黄土的力学特性。并总结不同成桩工艺对过湿黄土复合地基的加固适用性以及地基处理要点。  相似文献   

软弱地层深挖基坑中工程桩偏位分析   总被引：2，自引：1，他引：2  

肖军华  刘建坤  韩爱民 《工程地质学报》2006,14(3):405-410

某软土地基上建造多栋毗邻的小高层住宅,在地下车库基坑的开挖过程中,软土流动推挤坑内桩基导致偏位。文章以上述工程为背景,借助三维有限差分程序FLAC3D,选取简化计算模型,对基坑开挖流动土体作用下工程桩的反应性状进行了模拟与分析,并与实测值进行了比较,最后讨论了影响桩基变形的相关因素,可为分析软土地区基坑开挖对坑内工程桩影响时提供一定的理论指导。  相似文献   

Calibration of dynamic analysis methods from field test data   总被引：3，自引：0，他引：3  

A. Anandarajah  J. Zhang  C. Ealy 《Soil Dynamics and Earthquake Engineering》2005,25(7-10):763-772

In view of the heterogeneity of natural soil deposits and approximations made in analysis methods, in situ methods of determining soil parameters are highly desirable. The problem of interest here is the nonlinear dynamic behavior of pile foundations. It is shown in this paper that soil parameters needed for simplified dynamic analysis of a single pile may be back-calculated from the dynamic response of the pile measured in the field. A pile was excited by applying a large horizontal dynamic force at the pile-head level, and the response measured. In this paper, two different (simplified) methods of modeling the dynamic response of the pile are considered. One of the methods is based on the Winkler foundation approach, with the spring constant characterized by the so-called nonlinear p–y springs. The second method is based on the equivalent-linear finite element approach, with the nonlinearity of shear modulus and damping accounted for by employing the so-called degradation relationships. In the latter, the effect of interface nonlinearity is also considered. Starting with best estimates of soil parameters, the experimental data on the response of pile is used to fine-tune the values of the parameters, and thereby, to estimate parameters that are representative of in situ soil conditions.  相似文献   

深部软岩巷道喷射钢纤维混凝土支护技术   总被引：12，自引：1，他引：12  

周宏伟  谢和平  董正亮  张志林  张敬书  方晓瑜 《工程地质学报》2001,9(4):393-398

针对深部软岩的基本特征, 提出了深部软岩巷道支护的新思路, 即改变现有的锚喷作业顺序, 并通过在素喷混凝土中掺入适量钢纤维的方法来改善混凝土的整体力学性能, 使之更好地适应软岩巷道大变形的需要。借助数值模拟, 进行了支护方案的对比分析, 并提出了合理的支护方案。  相似文献   

渭南市电信生产楼桩基工程断桩事故的处理方案     

王振福  刘铁 《陕西地质》2001,19(1):51-52,58

断柱事故在桩基施工中不可避免，本文结合渭南电信生产楼桩基施工中断桩事故处理的实践，提出处理断桩事故的几种方案，以期与大家进行交流和探讨。  相似文献   

The contamination of former iron and steel works sites   总被引：3，自引：0，他引：3  

A. J. Harber  R. A. Forth 《Environmental Geology》2001,40(3):324-330

 Former iron and steel works sites are significant in terms of their size, number, degree of contamination, and their wide distribution in the United Kingdom. They are likely to have become chemically contaminated with a wide range of substances from the manufacture of iron and steel, and the many associated processes. Associated processes include coke-production, metal refining and finishing. Contamination by metals, inorganic and organic compounds, acids/alkalis and asbestos is common on such sites. The aim of this research was to draw together information on the contamination of former iron and steel works through a review of current literature and by the use of examples and case studies from the UK. The style of the paper is loosely based on an Inter-departmental Committee for Research in Contaminated Land (ICRCL) style guidance note, with case studies and examples. Received: 11 October 1999 · Accepted: 8 March 2000  相似文献   

武钢镁碳砖首次用于盛钢桶衬砖的侵蚀机理研究     

沈上越  苏良赫 《现代地质》1991,5(1):51-57

作者对我国武钢转炉盛钢桶镁碳砖的理化性能、使用条件,侵蚀情况等进行了详细的研究,在渣线处,它明显地优于镁砖.同时,在镁碳砖渐变带与反应带之间发现—镁铝尖晶石层,有延缓钢渣的锓蚀作用,并从热力学计算揭示了脱碳层及镁铝尖晶石层的形成,提出了增强衬砖寿命的具体改进措施,具有重要的理论和实际意义.  相似文献