Spatiotemporal evolution of excess pore pressures in a silty seabed under progressive waves during residual liquefaction

doi:10.1016/j.apor.2022.103401

CORC > 力学研究所 > 中国科学院力学研究所 > 流固耦合系统力学重点实验室(2012-)

	Spatiotemporal evolution of excess pore pressures in a silty seabed under progressive waves during residual liquefaction
	Li CF(李畅飞)2,3; Wang YF 1; Gao FP(高福平)2,3; Yang LJ(杨鲤境)2,3
刊名	APPLIED OCEAN RESEARCH
	2022-12-01
卷号	129 页码:14
关键词	Pore pressure Wave loading Flume observation Silty seabed Seabed liquefaction
ISSN号	0141-1187
DOI	10.1016/j.apor.2022.103401
通讯作者	Gao, Fu-Ping(fpgao@imech.ac.cn)
英文摘要	Both transient and residual pore pressure responses are induced as ocean waves propagate over a silty seabed. In this study, the spatiotemporal evolution of excess pore pressure in a silty seabed under progressive waves was physically modelled in a large wave flume. Three typical stages were identified in the process of residual liquefaction via flume observations, including quasi-elastic, intensive build-up of residual pore pressure, and continuous liquefaction stages. During the initial quasi-elastic stage before the liquefaction of the silt bed, the transient pore pressure can be well predicted by the analytical solution based on poro-elastic theory. After that, the residual pore pressure builds up intensively to its maximum value, even in the case that the transient pore pressure is nearly negligible at deep soil layer. Once the residual liquefaction occurs, the poro-elastic theory becomes invalid for describing the pore pressure response. The residual liquefaction is not simultaneously induced within the entire bed, but gradually progresses downward from the shallow layer of the silt bed to deeper. The pore pressure amplitude is significantly amplified after the silt liquefies, while no amplitudeamplification was observed within the un-liquefied silt. An amplification ratio (zeta) is proposed to characterize the amplification effect and distinguish the onset of residual liquefaction. The value of zeta during the continuous liquefaction stage is found to be one order of magnitude larger than that in the quasi-elastic stage. Comparisons with the existing centrifuge tests further indicate that the critical cyclic stress ratio for the silt bed is much smaller than that for the sand bed, implying the silt bed is more prone to residual liquefaction.
分类号	二类/Q1
资助项目	National Natural Science Foundation of China ; Strategic Priority Research Program (Type -B) of Chinese Academy of Sciences ; [11825205] ; [12061160463] ; [XDB22030000]
WOS关键词	LIQUEFIED SOIL ; SAND ; PIPELINES
WOS研究方向	Engineering ; Oceanography
语种	英语
WOS记录号	WOS:000899530300004
资助机构	National Natural Science Foundation of China ; Strategic Priority Research Program (Type -B) of Chinese Academy of Sciences
其他责任者	Gao, Fu-Ping
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/91269]
专题	力学研究所_流固耦合系统力学重点实验室(2012-)
作者单位	1.Univ Melbourne, Fac Engn & Informat Technol, Dept Infrastruct Engn, Melbourne, Vic 3010, Australia 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 3.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China;
推荐引用方式 GB/T 7714	Li CF,Wang YF,Gao FP,et al. Spatiotemporal evolution of excess pore pressures in a silty seabed under progressive waves during residual liquefaction[J]. APPLIED OCEAN RESEARCH,2022,129:14.
APA	李畅飞,Wang YF,高福平,&杨鲤境.(2022).Spatiotemporal evolution of excess pore pressures in a silty seabed under progressive waves during residual liquefaction.APPLIED OCEAN RESEARCH,129,14.
MLA	李畅飞,et al."Spatiotemporal evolution of excess pore pressures in a silty seabed under progressive waves during residual liquefaction".APPLIED OCEAN RESEARCH 129(2022):14.