气候变化领域集成服务门户(CCPortal): Hydro-mechanical behaviour of soil experiencing seepage erosion under cyclic hydraulic gradient

CCPortal

DOI	10.1680/jgeot.20.P.340
	Hydro-mechanical behaviour of soil experiencing seepage erosion under cyclic hydraulic gradient
	Chen, Chen; Zhang, Limin
发表日期	2023
ISSN	0016-8505
EISSN	1751-7656
起始页码	115
结束页码	127
卷号	73 期号:2
英文摘要	Numerous incidents and failures of earth slopes, dykes, levees and embankment dams are caused by internal erosion. At a time of global climate change, rapid pore-water pressure changes in soil masses are frequently induced by extreme rainfall, storm surges, waves, flash floods and so on. Under such complex cyclic hydraulic conditions, the soil erodibility, hydraulic conductivity and subsequent stress-strain behaviour may differ from those under the monotonic seepage condition, and are still poorly understood. In this study, preliminary laboratory tests have been conducted to investigate the development of internal erosion and changes in hydraulic conductivity under one-way cyclic seepage, and the post-erosion stress-strain behaviour. Representative internally stable and unstable soils were tested. The effects of mean hydraulic gradient and cyclic gradient amplitude were investigated in detail. Results show that the erosion development is significantly influenced by both the initial grain size distribution and the pattern of imposed cyclic hydraulic gradient. The cyclic seepage promotes the loss of fine particles and leads to larger hydraulic conductivity. For the internally unstable soil, the eroded soil mass and hydraulic conductivity increased significantly with increasing cyclic gradient amplitude. Nevertheless, the internally stable soil experienced a small amount of particle loss, even under large cyclic gradients. For both types of soil, a larger cyclic gradient amplitude corresponds to a stronger post-erosion contractive shearing behaviour and a smaller critical friction angle.
英文关键词	dams; erosion; permeability; seepage; shear strength; waves & wave loading
语种	英语
WOS研究方向	Engineering, Geological
WOS类目	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000917275500003
来源期刊	GEOTECHNIQUE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/281343
作者单位	Sichuan University; Sichuan University; Hong Kong University of Science & Technology
推荐引用方式 GB/T 7714	Chen, Chen,Zhang, Limin. Hydro-mechanical behaviour of soil experiencing seepage erosion under cyclic hydraulic gradient[J],2023,73(2).
APA	Chen, Chen,&Zhang, Limin.(2023).Hydro-mechanical behaviour of soil experiencing seepage erosion under cyclic hydraulic gradient.GEOTECHNIQUE,73(2).
MLA	Chen, Chen,et al."Hydro-mechanical behaviour of soil experiencing seepage erosion under cyclic hydraulic gradient".GEOTECHNIQUE 73.2(2023).