Particle obstruction and crushing of dredged calcareous soil in the Nansha Islands, South China Sea

doi:10.1016/j.enggeo.2019.105274

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

	Particle obstruction and crushing of dredged calcareous soil in the Nansha Islands, South China Sea
	Wang, Xinzhi ; Weng, Yiling ; Wei, Houzhen ; Meng, Qingshan ; Hu, Mingjian
刊名	ENGINEERING GEOLOGY
	2019
卷号	261 期号:-页码:-
关键词	Calcareous soil Shear strength Obstruction South China Sea Particle breakage Dilatancy
ISSN号	0013-7952
DOI	10.1016/j.enggeo.2019.105274
英文摘要	The bearing capacity of the dredged calcareous soil in the Nansha Islands, South China Sea typically exceeds that of terrigenous dredger fill. Furthermore, the shear strength of calcareous soil exceeds that of siliceous sand under identical conditions. It is mainly caused by the interparticle obstruction between calcareous soil particles. To explore the obstruction mechanism of calcareous soil particles, a series of triaxial tests were performed on calcareous soils under both consolidated undrained (CU) and consolidated drained (CD) conditions, respectively. Particle shape characteristics and particle crushing were also investigated to study the formation mechanism of obstruction force. Test results indicate that irregular particle shape is the prerequisite for the emergence of particle obstruction in calcareous soils. A simple obstruction-dilatation model was developed to describe the relationship among particle obstruction, dilation and particle crushing. The obstruction force varies greatly during the shearing process, which is mainly influenced by particle size and stress level. Under low confining pressure, particle obstruction results in dilatation and increases internal friction angle. In contrast, obstruction causes particle breakage, increases the apparent cohesion, and ultimately decreases the effective internal friction angle under high confining pressures. The particle obstruction of calcareous soil noticeably improves shear strength. Therefore, the effect of particle obstruction on strength should be considered in coral reef engineering design work.
WOS研究方向	Engineering ; Geology
语种	英语
WOS记录号	WOS:000496039100010
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/14836]
专题	岩土力学所知识全产出_期刊论文
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China; 2.Guangxi Rd & Bridge Engn Grp Co Ltd, Nanning, Peoples R China
推荐引用方式 GB/T 7714	Wang, Xinzhi,Weng, Yiling,Wei, Houzhen,et al. Particle obstruction and crushing of dredged calcareous soil in the Nansha Islands, South China Sea[J]. ENGINEERING GEOLOGY,2019,261(-):-.
APA	Wang, Xinzhi,Weng, Yiling,Wei, Houzhen,Meng, Qingshan,&Hu, Mingjian.(2019).Particle obstruction and crushing of dredged calcareous soil in the Nansha Islands, South China Sea.ENGINEERING GEOLOGY,261(-),-.
MLA	Wang, Xinzhi,et al."Particle obstruction and crushing of dredged calcareous soil in the Nansha Islands, South China Sea".ENGINEERING GEOLOGY 261.-(2019):-.