西安黄土土性参数随机场模型的适用性探讨

摘要

能否用齐次正态随机场模型来模拟土体性质的空间分布特性,其关键在于土性随机场模型是否具有平稳性和各态历经性.国内大多数研究都是在假定土性随机场模型是平稳随机场的条件下研究应用Vanmarcke模型的.关于黄土的土性参数的空间特性研究亦是如此,未对其土性剖面随机场的平稳性及各态历经性进行检验.本文以西安市曲江某项目29个钻孔的双桥静力触探(CPT)数据为研究样本,首先讨论了关于原始数据的齐次化处理,即趋势分量的消除方法.然后对该场地黄土土性剖面随机场的平稳性及各态历经性进行了检验,检验结果表明:西安黄土梁洼地貌上的Q3黄土层、Q3古土壤层和Q2黄土层其土性随机场模型具平稳性和各态历经性.故Vanmarcke随机场模型适用于模拟西安黄土土性剖面.%To apply the random field theory to the properties of a soil needs the spatial distribution of the soil properties to meet the stationarity and ergodicity.Most domestic researchers applied the vanmarcke model under the assumption that it meets the conditions of stationary random field theory.The investigations on loess also did not examine its stationarity and ergodicity.Based on the 29 drilling CPT data from a project in Xi'an Qujiang,this paper discusses the homogeneous processing of the raw data firstly (elimination of the trend component).And then it tests the stationarity and ergodicity of the loess soil properties.