【摘要】 基于钻孔岩心、浅层地震剖面和海洋磁力等资料,研究了胶州湾内海底基岩的类型、分布、埋深和工程力学性质等特征。结果表明,胶州湾基岩类型与相邻陆域基本一致,主要包括中生界莱阳群粗粒碎屑岩、青山群火山岩、王氏群细粒碎屑岩以及燕山晚期花岗岩类。各种类型基岩的分布大致是周边陆域基岩向海域的延伸,其中莱阳群分布在湾中西部;青山群分布较为分散,包括红岛以南、大沽河口外以及团岛和薛家岛之间的湾口地区;王氏群主要分布在湾北部和西部;花岗岩类分布在青岛-黄岛渡口一带和黄岛前湾。大部分区域基岩埋深在30m以上,总体呈现东深西浅、南深北浅的格局。湾内基岩埋深变化特征表现出与陆地基岩的延续性,是构造和岩性等因素共同作用的结果,并影响了现今的湾底地貌形态。基岩的岩性和风化程度是决定其物理力学性质的主要因素。更多还原

【Abstract】 The types, distributions, buried depths and physical mechanical properties of bed rocks in the Jiaozhou Bay were studied based on the boreholes, shallow seismic profiles and marine magnetic data collected in recent years. The results have revealed that the bed-rock types in the Jiaozhou Bay are basically similar to those in the adjacent land areas and consist chiefly of Mesozoic rocks including the coarse-grained clastic rocks of Laiyang group, the volcanic rocks of Qingshan group, the fine-grained clastic rocks of Wangshi group and the granitic rocks of late Yanshan period. The distributions of all these bed rocks show basically the seaward extensions of the bed rocks occurring in the surrounding land areas, among which the Laiyang group is mainly distributed in the central and western parts of the bay; the Qingshan group is more scattered and occurs mainly on the south of Hongdao, in the outer estuary of the Dagu River and in the bay-mouth area between Tuandao and Xuejiadao; the Wangshi group is mainly distributed in the northern and western parts of the bay; and the granitic rocks occurs mainly in the Qingdao-Huangdao ferrying area and in the bay front of Huangdao. The buried depths of the bed rocks are greater than 30 m in the most parts of the bay and tend to increase from the west to the east and from the north to the south. Such a changing pattern shows distinctly a continuously seaward extension of land bed rocks, which is considered to be mainly constrained by the factors such as tectonics and lithology of the bed rocks and has exerted influence to the present seabed geomorphic forms of the bay. The lithology and the weathering degree of the bed rocks are the main factors to determine their physical mechanical properties.更多还原