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Apr 26, 2012
Evaluation of Property Changes in Surrounding Clays due to Installation of Deep Mixing Columns
Authors: Shui-Long Shen, Norihiko Miura, Jie Han, and Hirofumi KogaAuthor Affiliations
Publication: Grouting and Ground Treatment
Abstract
This paper has identified four major factors causing property changes in surrounding soils during and after installation of deep mixing columns: soil fracturing, disturbance, thixotropy and consolidation, and diffusion of chemical agents. Laboratory and field tests were conducted to evaluate these changes during and after installation of deep mixing columns in soft Ariake clays. Both laboratory and field test data indicated that property changes existed within an influence zone ranging from the edge of the column to a distance of about twice the radius of the columns in surrounding clay. Within this influence zone, water content decreased with a closer distance to the columns while pH values and concentration of cations increased. Test results also showed that shear strengths of the surrounding clays decreased during the installation but regained after a short curing period (about 10 days in this study) and continued increasing in a long period. The increase of shear strengths in 30 days could reach 30% by average over the initial strength of the clays.
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© 2003 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Shui-Long Shen
Associate Professor, Department of Civil Engineering, Shanghai Jiao Tong University, 1954 Hua Shan Road, Shanghai 200030, China
Norihiko Miura
Professor, Department of Civil Engineering, Saga University, Honjo 1, Saga 840-8502, Japan
Jie Han
Assistant Professor, Department of Civil Engineering, Widener University, Chester, PA 19013-5792
Hirofumi Koga
Chief Engineer, Shinwa Techno Co. Ltd., 1856-1 Tokuman, Kubotacho, Saga 849-0201, Japan
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