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

doi:10.1016/j.apor.2022.103401

IMECH-IR > 流固耦合系统力学重点实验室

	Spatiotemporal evolution of excess pore pressures in a silty seabed under progressive waves during residual liquefaction
	Li CF(李畅飞)1,2; Wang YF3 ; Gao FP(高福平)1,2 ; Yang LJ(杨鲤境)1,2
通讯作者	Gao, Fu-Ping(fpgao@imech.ac.cn)
发表期刊	APPLIED OCEAN RESEARCH
	2022-12-01
卷号	129 页码:14
ISSN	0141-1187
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.
关键词	Pore pressure Wave loading Flume observation Silty seabed Seabed liquefaction
DOI	10.1016/j.apor.2022.103401
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000899530300004
关键词[WOS]	LIQUEFIED SOIL ; SAND ; PIPELINES
WOS研究方向	Engineering ; Oceanography
WOS类目	Engineering, Ocean ; Oceanography
资助项目	National Natural Science Foundation of China ; Strategic Priority Research Program (Type -B) of Chinese Academy of Sciences ; [11825205] ; [12061160463] ; [XDB22030000]
项目资助者	National Natural Science Foundation of China ; Strategic Priority Research Program (Type -B) of Chinese Academy of Sciences
论文分区	二类/Q1
力学所作者排名	1
RpAuthor	Gao, Fu-Ping
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/91270
专题	流固耦合系统力学重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 3.Univ Melbourne, Fac Engn & Informat Technol, Dept Infrastruct Engn, Melbourne, Vic 3010, Australia
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.

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