国家体育场斜柱测量放样原理与方法     

郑之宏  杨锐 《现代测绘》2008,31(2):12-15

本文用两种不同的数学方法解决国家体育场斜扭柱在任意高程上柱角点三维坐标计算问题,对斜柱现场放样的方法进行阐述。提出建筑施工测量中空间直角坐标系旋转矩阵法转换思路,并论述全站仪坐标放样限差的制定方法。  相似文献   

拓扑变换法在平面直角坐标近似变换中的应用     

陈群国  陈永立  赵根庄 《地理空间信息》2008,6(3):107-109

简要介绍了对平面直角坐标进行近似变换的几种方法,重点讨论了拓扑变换法对平面直角坐标进行近似变换的原理。并对其变换的精度情况进行了实践分析。提出了提高其变换精度的处理方法及在建立变换模型时应注意的问题。  相似文献   

浙东象山港岸线及潮滩变迁遥感调查     

赵玉灵  杨金中 《国土资源遥感》2007,18(4):114-117

利用多期遥感数据，对浙江省东部象山港一带近30 a来的海岸线及潮滩变迁状况进行了调查与监测。结果表明，该区淤泥质海滩发育，海岸类型以淤泥质为主，岸线在1986～1996年间有较大变化，外迁宽度最大达1 700 m，1996年以后基本进入稳定状态。潮滩发育具有差异性。  相似文献   

三维层状场地的精确动力刚度矩阵及格林函数   总被引：3，自引：1，他引：3  

梁建文  巴振宁 《地震工程与工程振动》2007,27(5):7-17

本文对Wolf二维层状场地精确动力刚度矩阵进行推广,给出了三维层状场地的精确动力刚度矩阵。刚度矩阵具有对称的特点,且因刚度矩阵是精确的,计算结果不受土层单元厚度的影响,可以大大提高计算效率。文中对刚度矩阵进行了数值验证。利用三维层状场地动力刚度矩阵,计算分析了基岩上单一土层场地的动力响应。最后作为动力刚度矩阵的另一重要应用,给出了表面或埋置矩形均布荷载或集中荷载的动力格林函数计算方法。  相似文献   

空间直角坐标计算大地坐标的抛物线逼近法   总被引：3，自引：0，他引：3  

牛卓立 《测绘工程》2000,9(3):30-32

采用抛物线逼近法求解大地纬度和大地高,先计算空间点在椭球面上的子午面坐标,然后求解点的大地纬度和大地高。  相似文献   

GIS在港口规划建设管理中的应用模型   总被引：3，自引：0，他引：3  

陈新  杨波 《海洋技术学报》2005,24(4):98-102

GIS（GEOGRAPHIC INFORMATION SYSTEM）又名空间地理信息系统,与空间位置有关的领域都是GIS的重要应用领域。GIS应用于港口规划建设与土地管理,通过GIS的开发应用,逐步实现相应管理工作的自动化和图形管理,规范业务工作流程,为电子口岸的建设提供物理空问的数据平台。基于对于港口规划建设管理需求的理解,结合GIS在国内外港口应用的现状和发展趋势,探讨了港口规划建设管理系统的框架模型和不同层次的开发建议。同时对于作为规划建设管理的基础平台的港口GIS信息数据平台及其结构框架也进行了讨论。  相似文献   

A new analytical model for consolidation with multiple vertical drains          下载免费PDF全文

Mengmeng Lu  Scott W. Sloan  Buddhima Indraratna  Hongwen Jing  Kanghe Xie 《国际地质力学数值与分析法杂志》2016,40(11):1623-1640

Various analytical theories of consolidation for soils with vertical drains have been proposed in the past. Most conventional theories are based on a cylindrical unit cell that contains only a single vertical drain. This paper described a new analytical model where a vertical drain located at the centre (the ‘inner vertical drain’) and is surrounded by two or three vertical drains (the ‘outer vertical drains’), the number of which depends on whether the configuration is triangular or rectangular. Both types of drains are combined into a cylindrical unit cell, and the water is assumed to flow both inwards to the inner vertical drain and outwards to the outer vertical drains distributed around the circumference. The outer radial boundary of the unit cell is regarded as a permeable boundary, with a drainage capacity of two or three separate vertical drains for triangular and rectangular configurations, respectively. The smear effects and the drainage resistances for both the inner and outer vertical drains are considered in the analysis as well. In this way, the equations governing the consolidation process with multiple vertical drains are derived, and the corresponding analytical solutions are obtained for instantaneously loading, ramp loading and multi‐stage of instantaneously loading and multi‐stage of ramp loading. The present solutions are finally compared with several conventional solutions for a single vertical drain in the literature. The results show that the present model predicts the same average degree of consolidation as conventional models do, which verifies the correctness of this new model. Finally, the settlement predicted by the present solution is compared with the measured settlement from a field test at the Port of Brisbane, Australia, which shows a good agreement between them. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

论河港的环境岩土工程     

李国明  音俊峰 《安徽地质》2011,21(3):231-234

简要介绍了环境岩土工程的概念及其研究意义,从大环境和小环境两个方面分析了河港工程建设中的环境岩土工程,并探讨了河港环境岩土工程的研究思路和方法。  相似文献   

上海洋山深水港区水文泥沙研究   总被引：1，自引：0，他引：1  

吴明阳  许家帅 《海岸工程》2011,30(2):43-49

根据洋山深水港区历年数次水文测验资料,对洋山深水港区水域潮流泥沙分布特征进行了分析研究,得出该区为典型的高流速、高含沙量海区,且具有通常海域截然不同的水文泥沙特性,为洋山深水港区工程方案设计及模型试验提供了科学依据.  相似文献   

Experimental study on the effectiveness of TLDs under wave loading     

Dong Sheng  Li Huajun  Lu Ming  Tomotsuka Takayama 《中国海洋大学学报(英文版)》2002,1(1):80-86

The objective of this study is to experimentally investigate the effectiveness of Tuned Liquid Dampers (TLDs) for suppressing the dynamic response of a platform structure subjected to wave loading and to explore the applicability of TLDs for suppressing the structural vibration of fixed offshore platforms. The experimental model is scaled according to a full size platform by matching its dynamic properties. Rectangular and circular TLDs of various sizes and water depths are examined.The experiments were performed in a 2-D wave flume. The effectiveness of TLDs is evaluated based on their response reduction. By observing the performance and the behavior of TLDs through laboratory experiments, the effects of a number of parameters including container shape, container size, number of dampers, frequency ratio, mass ratio, and incident wave characteristics are investigated.  相似文献