琼州海峡古河道及其工程地质评价
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  • 英文篇名:PALEOCHANNELS AND ENGINEERING GEOLOGICAL EVALUATION ALONG QIONGZHOU STRAIT
  • 作者:李振 ; 彭华 ; 马秀敏 ; 姜景捷 ; 孙尧
  • 英文作者:LI Zhen;PENG Hua;MA Xiumin;JIANG Jingjie;SUN Yao;Institute of Geomechanics,Chinese Academy of Geological Sciences;
  • 关键词:古河道 ; 琼州海峡 ; 工程地质 ; 地质灾害 ; 单道地震
  • 英文关键词:Paleochannel;;Qiongzhou strait;;Engineering geology;;Geologic hazard;;Single-channel seismic
  • 中文刊名:GCDZ
  • 英文刊名:Journal of Engineering Geology
  • 机构:中国地质科学院地质力学研究所;
  • 出版日期:2018-08-15
  • 出版单位:工程地质学报
  • 年:2018
  • 期:v.26;No.126
  • 基金:海洋基础性公益性地质调查项目(DD20160149)资助
  • 语种:中文;
  • 页:GCDZ201804022
  • 页数:8
  • CN:04
  • ISSN:11-3249/P
  • 分类号:196-203
摘要
为评价琼州海峡跨海通道工程稳定性,利用单道地震探测技术开展了海峡地质灾害调查,发现在地震反射层Ⅰ和层Ⅲ之间埋藏着两条古河道,沿现今海槽两侧的岸坡区发育。北侧古河道沿海峡北侧岸坡灯楼角至海安港一线发育,呈弧形绕雷州半岛西南玄武岩台地分布。南侧古河道分布于临高角至东水港一线。结合区域地质资料,确定它们具有形成较晚的年代学特征。北侧古河道形成年代至少晚于中更新世,南侧古河道可能为全新世。古河道几何特征分析显示其具有北缓南陡的不对称"U"型几何特征。按照钻探资料,古河道填充物具有软土、砂层互层沉积特征。因此,在地震、海浪和潮流及重大工程建设施工等外部动力联合作用下,古河道极易触发顺层滑塌、砂土液化、软土震陷等地质灾害。使得古河道工程地质条件及稳定性成为跨海通道无法规避且必须解决的地质问题之一。
        The geological hazards investigation is carried out,with the application of the single channel seismic detection technology, to evaluate the stability of the Qiongzhou strait cross-sea corridor engineering. Two paleochannels are found between the seismic reflection layers I and Ⅲ. They are along the both bank slopes of the present trough. The northern one lies on the bank slopes from the Dengloujiao Cape to the Haian Port. It has an arc-shaped geometry around the southwest basalt platform of the Leizhou Peninsula. The other is from the Lingao Cape to the Dongshui Port. According to the regional geological data,they both have a relatively late chronological characteristic. The northern one is at least later than the Middle Pleistocene,and the other may be Holocene. The geometric characteristic analysis shows their asymmetric "U"geometric feature. They are steep in the south side and gentle in the north. According to the drilling data,their filling has the deposition characteristics of mutual layer of soft soil and sand. Therefore,it is easy to trigger geological disasters including bedding collapse,sand liquefaction and soft soil seismic subsidence,due to the combined action of external forces such as earthquakes,waves and tidalcurrents and major engineering construction. Their geological conditions and stability can be one of the geological problems unable to evade and must be solved in the Qiongzhou strait cross-sea corridor engineering.
引文
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