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现代地质 ›› 2021, Vol. 35 ›› Issue (06): 1871-1879.DOI: 10.19657/j.geoscience.1000-8527.2021.190

• 石油地质学 • 上一篇    下一篇

深海沉积物贯入阻力影响因素及其变化规律

魏定邦(), 杨强, 夏建新()   

  1. 中国地质大学(北京) 海洋学院,北京 100083
  • 收稿日期:2021-01-25 修回日期:2021-03-30 出版日期:2021-12-10 发布日期:2022-02-14
  • 通讯作者: 夏建新
  • 作者简介:夏建新,男,教授,博士生导师,1969年出生,海洋科学专业,主要从事深海矿产资源开发技术方面的研究工作。Email: jxxia@vip.sina.com
    魏定邦,男,博士研究生,1994年出生,海洋科学专业,主要从事深海矿产资源开发技术方面的研究工作。Email: weidingbang@cugb.edu.cn
  • 基金资助:
    山东联合基金重点支持项目“深海多金属结核采集车关键技术研究”(U1906234)

Influencing Factors on Penetration Resistance of Deep Sea Sediments and Its Variation Patterns

WEI Dingbang(), YANG Qiang, XIA Jianxin()   

  1. School of Ocean Sciences, China University of Geosciences, Beijing 100083, China
  • Received:2021-01-25 Revised:2021-03-30 Online:2021-12-10 Published:2022-02-14
  • Contact: XIA Jianxin

摘要:

深海沉积物土工力学特性是深海资源开发设备设计的重要依据。根据现有的深海土工力学原位测量和取样实验的数据,分析沉积物物性参数与贯入阻力的相关关系,建立含水率、湿密度和孔隙比与压力沉陷的关系式。结果表明:研究区深海沉积物以砂质粉砂、黏土质粉砂为主,具有高含水率、大孔隙比、低密度等特征;物理参数与贯入阻力之间有较好的相关关系,其中,含水率、孔隙比、孔隙度与贯入阻力呈反比相关关系;而湿密度与贯入阻力呈正比相关关系;以含水率、湿密度和孔隙比为自变量的多变量回归分析方程能更好地表达沉积物物理特性与贯入阻力的相关关系;基于Bekker沉陷模型,建立接地比压与贯入阻力的关系,能客观反映深海沉积物的沉陷特性与承载特性。

关键词: 深海沉积物, 物理参数, 贯入阻力

Abstract:

Geotechnical characteristics of deep-sea sediments are the important basis for the design of deep-sea resources development equipment. Based on the in-situ measurement data and sampling experiment of deep-sea geotechnical mechanics, the relations between physical and geotechnical parameters of sediment and penetration resistance were analyzed, and the relations between water content, wet density, void ratio and pressure settlement were established. The results show that (1) deep-sea sediments in the study area are mainly sandy silt and clayey silt, characterized by high water content, large pore ratio and low density; (2) physical parameters and penetration resistance are well correlated, and water content, pore ratio and porosity are inversely proportional to penetration resistance; (3) wet density is proportional to penetration resistance. Based on the Bekker subsidence model, the relation between specific ground pressure and penetration resistance was established, which can objectively reflect the deep-sea sediment subsidence and bearing features.

Key words: deep-sea sediments, physical parameters, penetration resistance

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