Deep Mixing Induced Property Changes in Surrounding Sensitive Marine Clays
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 134, Issue 6
Abstract
This paper presents a field study of installation effects of deep mixed columns on properties of the sensitive Ariake marine clay. Cone penetration tests were performed in the field to evaluate the change in the strength of the surrounding clay with time. Soil samples were taken before and after column installation to evaluate variations of physical, mechanical, and chemical properties of the surrounding clay. Test results indicated that the water content of the surrounding clay decreased while the concentration of cations increased as sampling locations approached the columns. Shear strength of the surrounding clay decreased during the installation but recovered after a short period of curing. Shear strength continued to increase with time over a period of . Based on the regression results, the surrounding soil after the installation of the columns took approximately to recover to the strength value before installation. On average, the shear strength of the surrounding clay increased over the original strength by approximately 23% after and 50% after , respectively. Discussion is presented on strength changes and key influence factors including soil disturbance and fracturing, thixotropy, consolidation, and diffusion of cations from deep mixed columns to the surrounding clay.
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Acknowledgments
This field study was conducted as a collaborative research project sponsored by Institute of Lowland Technology (ILT), Saga University, Shinwa Techno Co. Ltd., and Matsuo Construction Co. Ltd. The first writer would like to express his grateful thanks to Professor Norihiko Miura (Director, Institute of Soft Ground Engineering, Japan; formerly Director of the ILT) for his support. This work was undertaken with financial support from the National Nature Science Foundation of China (Grant No. NNSFC50779035) and the Science and Technology Commission of Shanghai Municipality (Grant No. UNSPECIFIED05PJ14069). This work was also supported by Shanghai Leading Academic Discipline Project (Project No. UNSPECIFIEDB208). The writers are also grateful to Professor Robert L. Parsons at Department of Civil, Environmental, and Architecture Engineering at the University of Kansas, the United States for his suggestions and comments, which have improved the quality of this paper.
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Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 134 • Issue 6 • June 2008
Pages: 845 - 854
Copyright
© 2008 ASCE.
History
Received: Feb 7, 2007
Accepted: Sep 25, 2007
Published online: Jun 1, 2008
Published in print: Jun 2008
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