基于地统计分析的大同盆地Vse20及建筑场地类别预测

Prediction of Vse20 and Building Site Classification in Datong Basin based on Geostatistical Analysis

土层剪切波速是重要的工程地质参数,对场地类别划分及工程地质条件分析具有重要意义。以大同盆地为研究对象,对盆地进行了地质单元划分及地层岩性特征分析,依据盆地内已实施的大量地质勘察钻孔的剪切波速资料,采用地统计学方法中的空间分析、探索性统计分析、Kriging插值、确定性插值方法,给出了大同盆地范围内任意场点的Vse20及建筑场地类别预测分布。分析结果表明大同盆地内区域范围内任意场点的等效剪切波速及建筑场地类别数据与地质单元类型具有明显的相关性,对于盆地内不具备实施钻孔及无法进行原位测试试验的场点来说,本文提供了一种很好的预测分析方法,研究成果可为当地的国土资源规划及岩土勘察设计提供基础资料,同时可为大同盆地区域性地质条件分析、三维地质模型及大震情景模型构建提供一定的借鉴意义。

Shear wave velocity of soil layer is an important engineering geological parameter, which is of great significance for site classification and engineering geological condition analysis. Taking Datong Basin as the research object, this paper divides the geological units and analyzes the stratigraphic and lithologic characteristics of the basin. Based on the data of shear wave velocity of the boreholes that have been implemented in the basin, through the spatial analysis, exploratory statistical analysis, Kriging interpolation and deterministic interpolation methods in geostatistics, the Vse20 of any field point and the prediction of building site types in Datong Basin are given. The results show that the data of equivalent shear wave velocity and construction site type of any field point in Datong Basin have obvious correlation with the type of geological unit. For the field points without drilling and in-situ test, this paper provides a good prediction and analysis method. The research results can be used for local land and resources planning and rock resources planning. The basic data of soil investigation and design can be used for reference in regional geological condition analysis, three-dimensional geological model and large earthquake scenario model construction of Datong Basin.