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Compressibility characteristics of bio-cemented calcareous sand treated through the bio-stimulation approach

Journal of Rock Mechanics and Geotechnical Engineering 2023年第2期15卷 510-522页

作者： Yijie Wang Ningjun Jiang alexandra clarà saracho Ogul Doygun Yanjun Du Xiaole Han Institute of Geotechnical Engineering Southeast UniversityNanjingChina Department of Civil and Environmental Engineering University of Hawaii at ManoaHonoluluUSA Department of Engineering Cambridge UniversityCambridgeUK Geosyntec Consultants Inc.Huntington BeachUSA

Calcareous sand is widely present in coastal areas around the world and is usually considered as a weak and unstable material due to its high compressibility and low ***-induced calcium carbonate precipitation(MICP)is a promising technique for soil ***,the commonly adopted bio-augmented MICP approach is in general less compatible with the natural soil ***,this study focuses on the bio-stimulated MICP approach,which is likely to enhance the dominance of ureolytic bacteria for longer period and thus is deemed more *** main objective of this paper is to investigate the compressibility of calcareous sand treated by bio-stimulated MICP *** the current study,a series of one-dimension compression tests was conducted on bio-cemented sand pre-pared via bio-stimulation with different initial relative densities(D r).Based on the obtained compression curves and particle size distribution(PSD)curves,the parameters including cementation content,the coefficient of compressibility(a v),PSD,relative breakage(B r),and relative agglomeration(A r)were *** results showed that a v decreased with the increasing cementation *** bio-cemented sand prepared with higher initial D r had smaller(approximately 20%e70%)a v values than that with lower initial D *** specimen with higher initial D r and higher cementation content resulted in smaller B r but larger A ***,a conceptual framework featuring multiple contact and damage modes was proposed.

关键词： Calcareous sand Bio-cementation Bio-stimulation Compressibility

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