董友扣,马家杰,王栋,RANDOLPH Mark.深海滑坡灾害的物质点法模拟[J].海洋工程,2019,37(5):141~147
深海滑坡灾害的物质点法模拟
Investigation of landslide in deep sea using material point method
  
DOI:10.16483/j.issn.1005-9865.2019.05.016
中文关键词:  海底滑坡  滑动特性  海底结构物  海洋资源  物质点法  大变形  海底管线
英文关键词:submarine landslide  runout behaviour  subsea structure  marine resource  material point method  large deformation  ubsea pipeline
基金项目:国家自然科学基金项目(U1806230)
作者单位E-mail
董友扣 中国地质大学(武汉) 海洋学院湖北 武汉 430074 dongwang@ouc.edu.cn 
马家杰 西澳大利亚大学 离岸基础中心珀斯 6009  
王栋 中国海洋大学 山东省海洋环境地质工程重点实验室山东 青岛 266100  
RANDOLPH Mark 西澳大利亚大学 离岸基础中心珀斯 6009  
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中文摘要:
      深海滑坡可以沿着斜坡搬运大量沉积物,是危害巨大的海洋地质灾害之一。评估深海滑坡的流滑机制并量化分析其对海底结构物的冲击对海洋资源的开发利用至关重要。采用物质点法对滑坡的滑动特性进行了总应力分析。设计了三组不同的土体、海床参数,展现了三种不同的滑动形态:延展、块体和扩张。随后复现了流滑体对部分暴露管线的冲击过程,并对冲击力的稳定值进行了分析,分析中考虑了流滑体的惯性、抗剪强度和静压力的影响。研究表明,物质点法能够用于模拟深海滑坡的流滑过程及其对海底结构物的冲击,可以为海洋工程中的实际设计工作提供服务。
英文摘要:
      Submarine landslides are one of the most hazardous agents through which vast volumes of sediments are transported across the slopes. Assessment of the runout mechanism of the slides and quantification of their impact forces on the subsea structures are essential to the course of ocean resource exploitation. The runout behaviour of the slides is analysed using the MPM in total stress framework. A real case history of submarine slide is back-analysed. Runout of the slides from a steep slope to a moderate base is reproduced. Then different combinations of soil and seabed parameters are assumed to trigger runout mechanisms of elongation, block sliding and spreading. The behaviour of the slide mass impacting and then flowing across a partially exposed pipe is reproduced. The steady value of the impact force is quantified, considering the combined effects due to the inertia, shear strength and static pressure of the sliding material. The MPM is capable to simulate the sliding process of submarine landslide and its impact on subsea structure, serving the design practices in offshore engineering.
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