Comparison of sedimentary environment and geotechnical properties of Lake Agassiz and Ariake clays for application of Deep Mixing Method

Toshiyuki Himeno, Marolo Alfaro, Takenori Hino

In the proceedings of: GeoSt. John's 2019: 72nd Canadian Geotechnical Conference

Session: Laboratory Testing

ABSTRACT: Deep mixing method (DMM) is a ground stabilization technique using lime or cement binders. The DMM has gained increasing applications to minimize ground settlements and increase capacity to support structures. It is often used as one of the ground improvement methods in soft ground such as the Ariake Sea coast lowland (Saga) in Japan to support highway embankments. However, there were cases where foundations improved by DMM columns had collapsed. The effectiveness of DMM is highly dependent on the physicochemical properties of natural clays. It is important to understand the sedimentary environment and geotechnical characteristics of the site. So far, there is no case where DMM has been used in Lake Agassiz clay deposits in Manitoba to improve the soft and compressible clay deposits. Data are required to determine the optimal number of admixtures in Lake Agassiz clay. In this paper, the sedimentary environment and geotechnical properties with Lake Agassiz clay and Ariake clay were first compared. There have been a lot of studies on the effectiveness of soil-cement applications in Japan and it is valuable as basic knowledge to compare strength development of Ariake clay and Lake Agassiz clay which has been improved.

RÉSUMÉ: La méthode de mélange en profondeur (DMM) est une technique de stabilisation du sol utilisant des liants à chaux ou au ciment. Le DMM a été plus executé pour minimiser les zones et augmenter la capacité portante des remblais routiers. Cependant, dans certains cas, les fondations améliorées grâce aux colonnes DMM se sont effondrées. L'efficacité du DMM dépend fortement des propriétés physico-chimiques des argiles naturelles. Il est important de comprendre l'environnement sédimentaire et les caractéristiques géotechniques du site. Jusqu'à présent, il n'y a pas eu de cas d'utilisation de DMM dans les dépôts d'argile du lac Agassiz au Manitoba pour améliorer les dépôts d'argile molle et compressible. Des données sont nécessaires pour déterminer la quantité optimale d'adjuvants dans l'argile du lac Agassiz. Dans cet article, l'environnement sédimentaire et les propriétés géotechniques de l'argile du lac Agassiz et de l'argile d'Ariake ont d'abord été comparés. De nombreuses études sur l'efficacité des applications sol-ciment au Japon ont été menées et il est important de comparer les résistances au cisaillement non limitées de l'argile Ariake traitée à celles de l'argile lac Agassiz traitée.

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Cite this article:
Toshiyuki Himeno; Marolo Alfaro; Takenori Hino (2019) Comparison of sedimentary environment and geotechnical properties of Lake Agassiz and Ariake clays for application of Deep Mixing Method in GEO2019. Ottawa, Ontario: Canadian Geotechnical Society.

@article{Geo2019Paper259,author = Toshiyuki Himeno; Marolo Alfaro; Takenori Hino,title = Comparison of sedimentary environment and geotechnical properties of Lake Agassiz and Ariake clays for application of Deep Mixing Method,year = 2019}