干旱区生态环境知识资源中心(Arid): Influence of swell on undrained shear strength of expansive Ankara clay

Arid

DOI	10.1007/s12517-020-05767-z
	Influence of swell on undrained shear strength of expansive Ankara clay
	Deliktas, Ceren; Cokca, Erdal
通讯作者	Cokca, E
来源期刊	ARABIAN JOURNAL OF GEOSCIENCES
ISSN	1866-7511
EISSN	1866-7538
出版年	2020
卷号	13 期号:18
英文摘要	Expansive clays cause problems throughout the earth, in particular for the locations in arid or semi-arid climate. Ankara (Turkey) is in semi-arid climate and change in moisture content of the reddish-brown expansive Ankara clay causes swell-shrink related movements and damages on lightweight structures. Over-estimation of undrained shear strength of an expansive clay without considering swell amount can lead to failures (i.e., bearing capacity, slope stability, and pile capacity). Since the existence of water significantly affects the engineering properties of the swelling soils, the effect of swell on the undrained shear strength of Ankara clay was researched in this laboratory study. To verify this effect, tests were done on three expansive Ankara clay samples with distinct degree of expansiveness. Expansive clay samples were taken from several sites in Ankara. Before swell-shear test cycle, index properties of the samples were determined. Swelling of the specimens in designed molds and shearing process including 0%, 10%, 15%, 20%, 25%, 50%, and 75% of ultimate vertical swell and 100% swell were followed it. It has been determined that undrained shear strength of the expansive Ankara clay is considerably affected by the amount of swell depending on the test results. The undrained shear strength decreases with increasing water content. It was observed that the shear strength of the specimens was decreased to nearly 70% of its initial value, even at the 10% of ultimate swell, and the undrained shear strength of expansive Ankara clay specimens was lost to a degree of almost 90% of their initial value (i.e., almost complete loss of strength due to swelling), this is one of the major factors causing failure of structures in/on the expansive Ankara clay due to wetting in the depth of active zone.
英文关键词	Expansive clay Free swell index Methylene blue test Swell percentage Rate of swell Undrained shear strength
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000569804300001
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326329
作者单位	[Deliktas, Ceren; Cokca, Erdal] Middle East Tech Univ, Dept Civil Engn, K1 Bldg,Univ Mah Dumlupinar Bulv, TR-06800 Ankara, Cankaya, Turkey
推荐引用方式 GB/T 7714	Deliktas, Ceren,Cokca, Erdal. Influence of swell on undrained shear strength of expansive Ankara clay[J],2020,13(18).
APA	Deliktas, Ceren,&Cokca, Erdal.(2020).Influence of swell on undrained shear strength of expansive Ankara clay.ARABIAN JOURNAL OF GEOSCIENCES,13(18).
MLA	Deliktas, Ceren,et al."Influence of swell on undrained shear strength of expansive Ankara clay".ARABIAN JOURNAL OF GEOSCIENCES 13.18(2020).