Experimental microscopic investigation of the cyclic swelling and shrinkage of a natural hard clay

doi:10.1680/jgeot.17.P.053

CORC > 武汉岩土力学研究所 > 中科院武汉岩土力学所 > 岩土力学所知识全产出 > 期刊论文

	Experimental microscopic investigation of the cyclic swelling and shrinkage of a natural hard clay
	Yang, Diansen ; Chen, Weizhong ; Wang, Linlin ; Chen, Liufeng ; Wang, Wei
刊名	GEOTECHNIQUE
	2019
卷号	69 期号:6 页码:481-488
关键词	anisotropy clays deformation laboratory tests radioactive waste disposal
ISSN号	0016-8505
DOI	10.1680/jgeot.17.P.053
英文摘要	In this paper, a microscopic experimental investigation of the swelling-shrinkage behaviour of a hard clay subjected to wetting and drying (W-D) cycles is presented. Three W-D cycles with a range of relative humidity from 20 to 98% were performed on the hard clay sample through varying the temperature and the vapour pressure in an environmental scanning electron microscope (ESEM). The obtained ESEM images of the material at different hydric stages were analysed using a digital image correlation method, and full-field strains at the micrometre scale were quantified. The results show that the deformation of the material when subjected to W-D cycles is significantly heterogeneous and it is closely related to its microstructure. The different contributions of clay particles and of inclusions to swelling and shrinkage of the hard clay are revealed: the clay minerals swell, which is, however, constrained by the no-swelling inclusions; the interaction between the different phases is significant. A residual swelling is found at the end of the first W-D cycle. The residual swelling continues to accumulate during the second cycle but becomes stable for the third cycle. Further microstructural analysis shows that the irreversible swelling can be mainly attributed to the appearance and propagation of microcracks accompanied by a limited unrecoverable deformation of the clay minerals.
WOS研究方向	Engineering
语种	英语
WOS记录号	WOS:000472137100002
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/14973]
专题	岩土力学所知识全产出_期刊论文
作者单位	1.Chinese Acad Sci, IRSM, State Key Lab Geomech & Geotech Engn, Wuhan, Hubei, Peoples R China; 2.Univ Chinese Acad Sci, Beijing, Peoples R China; 3.China Univ Petr, Coll Petr Engn, Beijing, Peoples R China; 4.Wuhan Univ, Sch Civil & Architectural Engn, Wuhan, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Yang, Diansen,Chen, Weizhong,Wang, Linlin,et al. Experimental microscopic investigation of the cyclic swelling and shrinkage of a natural hard clay[J]. GEOTECHNIQUE,2019,69(6):481-488.
APA	Yang, Diansen,Chen, Weizhong,Wang, Linlin,Chen, Liufeng,&Wang, Wei.(2019).Experimental microscopic investigation of the cyclic swelling and shrinkage of a natural hard clay.GEOTECHNIQUE,69(6),481-488.
MLA	Yang, Diansen,et al."Experimental microscopic investigation of the cyclic swelling and shrinkage of a natural hard clay".GEOTECHNIQUE 69.6(2019):481-488.