天津港地区土层剖面随机场特征参数的估计  

ESTIMATION OF RANDOM FIELD CHARACTERISTIC PARAMETERS OF SOIL LAYERS AT TIANJIN PORT

作　　者：郭林坪[1,2] 杨爱武[1] 闫澍旺[3] 侯晋芳[2] 

机构地区：[1]天津城建大学天津市软土特性与工程环境重点实验室,天津300384 [2]中交天津港湾工程研究院有限公司港口岩土工程技术交通行业重点试验室天津市港口岩土工程技术重点试验室,天津300222 [3]天津大学建筑工程学院,天津300072

出　　处：《工程地质学报》2016年第1期130-135,共6页Journal of Engineering Geology

基　　金：天津城建大学科研启动项目(64-05140206);港口岩土工程技术交通行业重点实验室开放课题基金(14-50);国家自然科学基金(41372291);天津市科技计划项目(15JCZDJC40600;15ZCDSF00220)资助

摘　　要：天然地基或人工地基在形成过程中,不同位置的土由于成因相似,其物理力学特性指标具有空间自相关性,这种空间自相关性可以用随机场理论进行研究。为估计天津港地区土体物理力学性质的空间随机场特性,采用了现场钻孔取样、静力触探等方法获取了大量的描述土体物理力学性质的参数。由于静力触探试验能够连续取样以获得足够多的数据来进行随机场分析,文章主要应用静探数据检验了该地区土性指标的平稳性和各态历经性,指出应用Vanmarcke的随机场模型对土性指标进行分析具有可行性。本文的创新点在于探讨了天津港地区随机场模型的建立方法并应用改进的完全不相关距离方法估计了天津港地区典型土层剖面的随机场特征参数。为随机场理论应用于天津港地区岩土工程可靠度分析打下了坚实的基础。相同的方法可用于其他地区土层随机场特征参数的估计。The environment and conditions for both natural and artificial soilsat different places are similar. Therefore physical and mechanical properties of soil samples are relevant.The relevance can be analyzed with random field theory.To estimate spatial characteristics of physical and mechanical properties of soil in Tianjin Port, tests such as boring in situ and standard cone penetration are employed to acquire enough test data that are essential to the employment of random field theory.Because it can continuously obtain enough data,the standard cone penetration test is the main method to get test data.The data is used to inspect the stationary and ergodicity of this area.Results show that the random field model put up by Vanmarcke can be employed in this research.In this paper,the innovation points include that the method establishing random field model in Tianjin Port is discussed and the characteristic parameters of typical layers in this area are estimated with the improved non-correlation method.The result can lay a solid foundation for reliability analysis in geotechnical engineering in Tianjin Port.This method of estimating characteristic parameters of random field can be used for other areas.

关 键 词：随机场特征参数 天津港 平稳性 各态历经性 相关距离 折减函数 

分 类 号：TU441[建筑科学—岩土工程]