渤海湾西岸浅埋古河道分布及水文工程地质特征研究

Research on the distribution and hydrological engineering geology characteristics of shallow-buried paleochannels on the west coast of Bohai Bay

以渤海湾西岸黄骅市大量地质钻孔资料为基础,利用电测深、野外调查、地形图判别、钻探等手段,通过钻孔剖面、地层分析,研究了区域内全新世古河道的分布及工程水文地质特征;统计分析古河道岩土体物理力学参数,提出地基承载力特征值和桩基处理建议。结果表明:区域古河道分布呈SW-NE走向的梳状河网,其分布与海进海退密切相关,并影响着咸水顶板埋藏深度;古河道的形成受气候和海平面作用影响,岩性以粉土、粉砂为主,浅层淡水、微咸水富水性中等,是区域浅层微咸水利用的重点区域。区域内古河道较好地反映出了渤海西海岸滨海平原的古地质史,有必要持续开展水文地质、第四纪地质和地质资源研究,为资源环境的合理开发利用及工程建设选址提供重要的基础科学依据。

Based on a large amount of geological drilling data from the west coast of the Bohai Bay in Huanghua City,the distribution and hydrogeological characteristics of the Quaternary paleochannels in the region were studied through borehole profiles and stratigraphic analysis.Methods used included electrical resistivity measurement,field investigations,topographic map interpretation,and drilling.The physical and mechanical parameters of the paleochannel soil and rock masses were statistically analyzed,and characteristic values of the foundation bearing capacity and pile foundation recommendations were proposed.The results showed that the distribution of paleochannels in the region formed a combshaped paleochannel network trending southwest to northeast,and their distribution was closely related to sea-level fluctuations,which affected the burial depth of the saline water interface.Their formation is influenced by climate and sealevel changes,mainly through loess and fine sandstone lithology,and shallow groundwater is mostly fresh to brackish with a moderate degree of salinity,making it a key area for the utilization of shallow brackish water resources in the region.In addition,paleochannels in the region reflect the geological history of the Bohai Bay coastal plain.It is necessary to continue research on hydrogeology,Quaternary geology,and geological resources to provide an important scientific basis for the rational development and utilization of resources and the selection of engineering construction sites.