干旱区生态环境知识资源中心(Arid): State-of-the-Art Research in Geo-energy and Geo-environmental Engineering: Energy Pile and Earthen Capillary Landfill Cover System

Arid

	State-of-the-Art Research in Geo-energy and Geo-environmental Engineering: Energy Pile and Earthen Capillary Landfill Cover System
	Ng, Charles W. W.; Coo, Jason L.; Gunawan, Anthony
通讯作者	Ng, CWW
来源期刊	GEOTECHNICAL ENGINEERING
ISSN	0046-5828
出版年	2018
卷号	49 期号:2 页码:1-11
英文摘要	Geo-energy and geo-environment are two branches of geotechnical engineering representing current and future grant challenges because of the pressing need to conserve energy and protect the environment. The Hong Kong University of Science and Technology has been actively seeking solutions to these two challenges. The first part (geo-energy) of this paper describes a series of novel cyclic heating and cooling centrifuge tests performed on replacement and displacement floating energy piles installed in both saturated sand and clay. The test results reveal that replacement floating energy piles exhibit ratcheting settlement under a constant working load but at a reducing rate when subjected to temperature cycles, irrespective of the type of soil in which they are embedded. On the contrary, displacement floating energy piles exhibit heave behaviour. No existing theoretical model can capture observed ratcheting pile settlement well. This suggests that care must be taken when designing replacement floating energy piles. In the second part (geo-environment) of the paper, a novel three-layer environmentally friendly earthen cover system for climate regions like Thailand, Indonesia, the Philippines, Malaysia and Singapore is investigated through theoretical examination, physical modelling (e.g., one-dimensional soil column and two-dimensional large flume tests), and advanced numerical simulations. This novel cover system consists of a fine-grained soil underneath a conventional two-layer cover with capillary barrier effects. Two-dimensional water infiltration experiments and numerical simulations show that the newly introduced fine-grained soil layer can greatly minimize rainfall infiltration even after a 4-h rainfall event having a return period of 100 years in climate regions. One-dimensional gas emission tests and numerical simulations reveal that a minimum of 0.6 m thick fine grained soil layer compacted at 10% saturation (e.g. those in arid regions) can adequately satisfy the Australian guidelines. No geomembrane is needed. This new environmentally friendly and robust earthen landfill cover system is thus a promising alternative to other landfill covers for minimizing rainfall infiltration and landfill gas emission under all kinds of weather conditions.
英文关键词	Geo-energy Geo-environment Energy Pile Landfill cover system
类型	Article
语种	英语
收录类别	ESCI
WOS记录号	WOS:000458269800002
WOS关键词	BIOCHAR-AMENDED CLAY ; FINAL COVER ; HYDRAULIC CONDUCTIVITY ; CYCLIC BEHAVIOR ; COMPACTED CLAY ; VOLUME CHANGE ; SOIL ; GAS ; PERFORMANCE ; BREAKTHROUGH
WOS类目	Engineering, Geological
WOS研究方向	Engineering
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/333291
作者单位	[Ng, Charles W. W.; Coo, Jason L.; Gunawan, Anthony] Hong Kong Univ Sci & Technol, Dept Civil & Environm Engn, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Ng, Charles W. W.,Coo, Jason L.,Gunawan, Anthony. State-of-the-Art Research in Geo-energy and Geo-environmental Engineering: Energy Pile and Earthen Capillary Landfill Cover System[J],2018,49(2):1-11.
APA	Ng, Charles W. W.,Coo, Jason L.,&Gunawan, Anthony.(2018).State-of-the-Art Research in Geo-energy and Geo-environmental Engineering: Energy Pile and Earthen Capillary Landfill Cover System.GEOTECHNICAL ENGINEERING,49(2),1-11.
MLA	Ng, Charles W. W.,et al."State-of-the-Art Research in Geo-energy and Geo-environmental Engineering: Energy Pile and Earthen Capillary Landfill Cover System".GEOTECHNICAL ENGINEERING 49.2(2018):1-11.