摘要
浅地层结构通常是跨海通道工程建设需要重点考虑的因素之一。在渤海海峡地区,查明蓬莱至旅顺一线海域海底浅地层结构是开展该区域海底隧道施工的先决条件。以往的海底浅地层结构调查多关注南段蓬莱角至砣矶岛,少有涉及到北段老铁山水道。本文以老铁山水道海底地层为重点研究对象,开展单道地震及钻探工作,获取了目标海域海底浅地层结构,对该海域海底基岩面埋深特征开展了初步探索。结果表明:老铁山水道南部以浅埋基岩为主,埋深多在30 m以浅;中部发育巨厚的粉砂黏土层,第四纪沉积层最厚186.30 m以上;北部大范围区域发育坚硬的厚砾土或铁板砂。本文的调查研究工作为渤海海峡海底隧道工程建设提供了科学支撑。
The shallow stratigraphic structure is one of the key factors to be considered in the project of cross-sea channel construction.In order to carry out the construction of a subbottom tunnel in the Bohai Strait,one of the prerequisites is to ascertain the undersea shallow stratigraphic structure in area from Penglai to Lüshun.In the previous surveys,the investigations of undersea shallow stratigraphic structure were mostly focused on in the southern area from Penglai to Tuoji Island,but rarely in the area of the Laotieshan Channel.In this paper,the undersea shallow stratigraphy in the area of the Laotieshan Channel is taken as the key object of study.The undersea shallow stratigrapic structures in the study area are obtained by means of single-channel seismic surveys and drilling work,and based on these data,the characteristics of the substrate burial depth in the study area are preliminarily investigated.The results indicate that in the southern part of the Laotieshan Channel shallow buried bedrocks are dominant,with the burial depth being mostly shallower than 30 m,and in the middle part of the channel a huge-thick silty clay layer is developed and the maximal thickness of the Quaternary sedimentary strata is over 186.30 m.In the northern part of the channel hard and thick gravels or iron-plate-like sands are developed in a wide area.This study can provide scientific support for the project of subbottom tunnel in the Bohai Strait.
作者
顾效源
王伟
何磊
GU Xiao-yuan;WANG Wei;HE Lei(Shandong Marine Geological Survey Institute, Yantai 264004, China;No.3 Exploration Institute of Geology and Mineral Resources, Yantai 264004, China;Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China)
出处
《海岸工程》
2021年第3期226-231,共6页
Coastal Engineering
基金
山东省财政地质勘查项目——山东半岛蓝色经济区重点规划区1∶5万海岸带综合地质调查(丁字湾)(鲁勘字(2016)69号)
山东省地质矿产勘查开发局2020年度局控地质勘查与科技创新项目——山东省海岸带地质环境演变规律与机制(202003)和山东半岛重点海湾地质环境与开发保护评价(HJ202101)。
关键词
渤海海峡
老铁山水道
钻孔
单道地震
Bohai Strait
Laotieshan Channel
drilling hole
single-channel seismology
