AN APPLICATION OF CENTRIFUGE MODEL IN ENVIRONMENTAL GEOTECHNICS ASSESSMENT OF SOFT GEOLOGICAL BARRIER SUBJECTED TO PILE CONSTRUCTIONS IN WASTE DISPOSAL SITE
In this paper, performance of natural clay barrier subjected to massive pile constructions is investigated using laboratory scale models on a geotechnical centrifuge. Model grounds comprising either thick barrier of soft clay or stiff clay were made and pile construction, pile lateral loading were simulated both in 1-G and High-G environments besides conducting advective-difrusive transport modeling for very long prototype design period in the centrifuge. Two types of pile namely open end and closed end steel piles were used as model piles. Deformation of the ground due to pile deflection under lateral loading and its impact on leakage, and the change in resistivity of ground in the vicinity of pile due to contaminant movement were monitored. Assessments of flow and transport around pilling area and pile free area were done on completion of the centrifuge test by thorough model excavation, sampling and chemical analysis. Test results reveal that soft ground is secure from its deterioration irrespective of the types of pile and their stiffness but stiff ground is susceptible to some amount of deterioration. However the degree of damage can be reduced by using open end piles for stiff ground provided that the piles are installed under appropriate surcharge pressure. So the stiffness of the ground and its thickness are very important parameters to be considered for the safety against possible environmental deterioration due to the mentioned activities.
natural clay barrier waste disposal landfill piling contaminant transport centrifuge
Jiro TAKEMURA Binod AMATYA Osamu KUSAKABE
Dept.of Civil & Environmental Engrg, Tokyo Institute of Technology, Japan Schofield Centre, University of Cambridge, UK
国际会议
International Symposium on Geoenvironmental Engineering(国际环境岩土工程研讨会
杭州
英文
295-313
2009-09-08（万方平台首次上网日期，不代表论文的发表时间）