用于计算西安黄土相关距离的空间范围的探讨  

Investigations of spatial range associated with the calculation of the correlation distance for Xi'an loess

作　　者：杨勇[1,2] 范文[2] 赵治海 张海峰 姜桂春 

机构地区：[1]西北综合勘察设计研究院,陕西西安710003 [2]长安大学,陕西西安710054

出　　处：《土木工程学报》2014年第11期92-97,共6页China Civil Engineering Journal

基　　金：国家自然科学基金(41272282);中国地质调查局地质调查工作项目(1212011220135)

摘　　要：土层的相关距离是表述土体空间变异性和相关性的基本参数,从理论上来讲,其应该是一个常量。实际研究表明,土层的相关距离随着用以计算平均的空间范围h(样本容量)的变化而变化。如何在有限的土层厚度范围内确定一个合理的用于计算相关距离的空间范围h至关重要。以西安黄土为例,利用测试间距较小的CPT数据作为样本,采用递推空间法计算了某黄土场地土层在不同样本长度(空间范围h)下的相关距离及方差折减函数,分析其随空间范围h的变化规律。提出适用于计算西安黄土相关距离的空间范围h的建议值,并对其误差进行分析。The theoreticalcorrelation distance of soil mass should be a constant as it describes the spatial variability and correlation of soil mass. Past studies shows that the correlation distance changes along with the spatial range or sample size used in the calculation. It becomes crucial to choose an appropriate spatial range for the calculation of correlation distance of finite layer of soil mass . Xi＇ an loess was taken as an example and the CPT data closely sampled are used for the calculations of correlation distance and deviation reduction function under different spatial ranges using the space recursive method. The changes of these statistical quantitieswith the space range are analyzed. A specific space range value for Xi＇ an loess is identified and its error analysis is performed as well.

关 键 词：西安黄土 相关距离 方差折减系数 空间范围 

分 类 号：TU444[建筑科学—岩土工程]