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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。
The gray clay of Zhanjiang group located in Zhanjiang area has a series of geotechnical problems in the practical engineering due to its unique strong structure. In the 1980s, the gray clay of Zhanjiang group was paid close attention by domestic scholars. Because Zhanjiang Formation strata have different depositional environments in the Leizhou Peninsula region, they exhibit different spatial distribution rules, and their distribution characteristics are difficult to grasp in practical engineering. According to the on-site geological survey data, combined with the topography and geology of Leizhou Peninsula, geological structure and depositional environment of the Zhanjiang formation, 27 drilling holes were drilled in the Leizhou Peninsula for geological drilling sampling. The typical stratigraphic profiles in different regions show that the gray clay has different depositional rhythm, burial depth and thickness of strata in different sedimentary environments. The distribution is regional. According to the depth of strata and the thickness of strata, the structural characteristics of gray clay are analyzed. influences. At the same time, based on the data of borehole formation, a three-dimensional geological model of Zhanjiang Formation structural clay spatial distribution rule is constructed by using the basic GIS software platform MAPGIS to fully display the whole distribution law of gray clay in Leizhou Peninsula and to visualize the spatial distribution of gray clay Finally, a brief introduction of the basic application of the model.