湛江组灰色黏土空间展布规律研究

分布于湛江地区的湛江组灰色黏土因其特有的强结构性在实际工程中产生一系列岩土工程问题，20世纪80年代已为国内众学者所关注。由于湛江组地层在雷州半岛区域内，具有不同沉积环境而表现出不同空间展布规律，实际工程中难以掌握其分布特性。根据现场地质调查资料，结合雷州半岛的地形地貌、地质构造以及湛江组地层的沉积环境，在雷州半岛布置27个钻孔进行地质钻探取样。不同区域典型地层剖面图说明，灰色黏土在不同的沉积环境有着不同沉积韵律、埋藏深度、地层厚度等，分布具有区域性，根据层顶埋深及地层厚度分析灰色黏土的结构性对实际工程的影响。同时，根据钻孔地层数据，利用基础 GIS软件平台MAPGIS构建湛江组结构性黏土空间展布规律三维地质模型，全面展示出灰色黏土在雷州半岛的整个展布规律，实现灰色黏土空间展布的可视化，最后简单地介绍该模型的基本应用。

Research on spatial distribution law of gray clays of Zhanjiang Formation

Gray clay of Zhanjiang Formation which widely distributes in Zhanjiang area have caused a series of geotechnical engineering problems in actual projects due to their strong structural characteristics which aroused great interest among Chinese scholars in 80 s of 20 century. It is difficult to understand the distribution of the Zhanjiang Formation, because different sedimentary environment shows different spatial distribution of the Zhanjiang formation in Leizhou peninsula. According to the data from site geology survey, 27 geological drillings had been done for the gray clay samples in different regions considering lots of factors such as topography, geological structure at Leizhou Peninsula as well as the sedimentary environment of Zhanjiang Formation. The typical profiles of different areas showed that gray clay had different sedimentary cycles, buried depth and thickness in different sedimentary environment. Its distribution is regional. The influences of gray clay on real projects were studied based on its buried depth and thickness. Additionally, a 3D geological model of spatial distribution of gray clay was established by using MAPGIS based on drilling survey data. This geological model can be used to study the spatial distribution of Zhanjiang Formation gray clays, and realized the visualization of gray clay spatial distribution. Finally, some basic applications of the proposed model are introduced.