戴旭,单仁亮,孔祥松,阳宁,孙嵩.马里亚纳海沟表层沉积物物理性质与微观结构初探[J].海洋工程,2019,37(2):150~156
马里亚纳海沟表层沉积物物理性质与微观结构初探
Preliminary study on physical properties and microstructure of deep-sea sediments from Marianas Trench
  
DOI:10.16483/j.issn.1005-9865.2019.02.017
中文关键词:  马里亚纳海沟  深海稀软底质土  物理性质  盐分修正  微观结构
英文关键词:Marianas Trench  deep-sea sediments  physical properties  salinity correction  microstructures
基金项目:海南省重大科技项目中国科学院深海矿产资源勘探关键技术装备研发(SQ2016HYZY008)
作者单位E-mail
戴旭 中国矿业大学(北京) 力学与建筑工程学院北京 100083 daixu@student.cumtb.edu.cn 
单仁亮 中国矿业大学(北京) 力学与建筑工程学院北京 100083 srl@cumtb.edu.cn 
孔祥松 中国矿业大学(北京) 力学与建筑工程学院北京 100083  
阳宁 中国科学院 深海科学与工程研究所海南 三亚 572000  
孙嵩 中国矿业大学(北京) 力学与建筑工程学院北京 100083  
摘要点击次数: 33
全文下载次数: 11
中文摘要:
      针对取样于141°48.700 8′E,11°11.698 8′N,深度为8 638 m的马里亚纳海沟海底表层沉积物,考虑该沉积物中的孔隙水为海水,提出一种测定其基本物理性质指标的修正方法,并测定其相关的物理性质指标,最后通过扫描电子显微镜观察其微观结构。研究结果表明:本次取样处的深海海底表层沉积物具有极高的含水率、高孔隙率、低密度、低比重、高饱和度等特性。考虑海水中盐分影响的修正后,该土样的含水率比修正前提高了11.68%,比重比修正前降低了7.66%。该沉积物显微结构以絮凝结构为主,中间夹杂着大量多孔隙的硅藻碎片和生物体的空壳,这使得该沉积物中的孔隙数量增多。研究结果将有助于了解马里亚纳海沟地区的深海沉积环境和历史,为深海集矿车的设计提供参考。
英文摘要:
      The deep-sea sediments were exploited from the 8 638 m-deep seafloor at 141°48.7008’E, 11°11.6988’N in the Pacific’s Marianas Trench by our research group. Considering the effects of salt in the sea-water, an improved method for determining the basic physical property indexes of the deep-sea sediments is proposed. The basic physical property indexes of the deep-sea sediments are measured and corrected according to the improved method, and the microstructures of the deep-sea sediments are analyzed by scanning electronic microscope (SEM). The results show that the properties of the deep-sea sediments have high water content, high void ratio, low density, low specific gravity, high saturated, etc. The water content of the deep-sea sediments has increased by 11.68%, and the specific gravity of the deep-sea sediments has decreased by 7.66% when considering the effects of salt in the sea-water. The microstructure of the deep-sea sediments is mainly composed of flocculation, with a large number of diatom debris and empty shells of organism around it. It is assumed that the presence of diatom debris and empty shells of organism increase the porosities of the deep-sea sediments, and affect other geotechnical properties. The research results can help us to understand the deep-sea sedimentary environment and history around the Pacific’s Marianas Trench. They can also provide an important reference for the design of deep-sea mining machines.
查看全文  查看/发表评论  下载PDF阅读器
关闭
水利部交通运输部国家能源局南京水利科学研究院 《海洋工程》编辑部  版权所有
地址: 南京虎踞关34号 邮编:210024 电话:025-85829332 E-mail: oe@nhri.cn
苏ICP备05007122号