The State of Practice in Deep Mixing Methods

Terashi, Masaaki

doi:10.1061/40663(2003)2

Cited by 60 publications

(34 citation statements)

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“…PC slurry was mixed with in-situ soil using deep mixing blades (Bruce, 2001;Terashi, 2003;Kitazume and Terash, 2013). The soil was an alluvial deposit from the abandoned Yellow River during Holocene, Quaternary period; it appeared in yellow-grey colour and had 17.9% sand (grain size: 0.075-2 mm), 75.7% silt (grain size: 0.002-0.075 mm), and 6.4% clay (grain size: b0.002 mm).…”

Section: Soil and Bindersmentioning

confidence: 99%

“…Bruce, 2001;Al-Tabbaa, 2003;Terashi, 2003;Al-Tabbaa et al, 2011;Terashi and Kitazume, 2011;Kitazume and Terash, 2013); however, there are significant environmental impacts associated with Portland cement (PC) production, such as high CO 2 emissions (0.95 t CO 2 /t PC), energy consumption (5000 MJ/t PC), and non-renewable resources (1.5 t limestone and clay/t PC) (Higgins, 2007). In this context, the use of industry byproducts/wastes has been encouraged, such as ground granulated blastfurnace slag (GGBS), a by-product of the steel industry (Jegandan et al, 2010;Nidzam and Kinuthia, 2010;Wilkinson et al, 2010aWilkinson et al, , 2010b.…”

Section: Introductionmentioning

confidence: 98%

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Comparison of reactive magnesia- and carbide slag-activated ground granulated blastfurnace slag and Portland cement for stabilisation of a natural soil

Zheng

Liu

et al. 2015

Applied Clay Science

113

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Section: Soil and Bindersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Comparison of reactive magnesia- and carbide slag-activated ground granulated blastfurnace slag and Portland cement for stabilisation of a natural soil

Zheng

Liu

et al. 2015

Applied Clay Science

113

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“…평가를 하고있다 (Terashi, 2003 (Terashi, 2003;Broms, 2003;Kivelo, 1998)에서도 개량체 기둥의 휨 또는 전도에 의한 파괴가 발생한다는 사실을 확인하였다. 또한 Miyake et al (1991), Kitazume et al (1996Kitazume et al ( , 1999Kitazume et al ( , 2000, 그리고 (Maher, 1994;Y.…”

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Flexural Strength Characteristics of PVA Fiber Reinforced Clayey Soil-Cement Mixture

Kim¹,

Jung²,

Cho³

2012

Journal of korean society of hazard mitigation

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Currently, the stability analysis of embankments founded on soft ground stabilized with DCM (Deep Cement Mixing) columns has been performed based on a limit equilibrium analysis by using a shear strength of composite ground. Recent research efforts based on centrifuge tests, numerical analyses, and case studies revealed that the group of DCM columns might fail by several failure modes governed not only by shear failure but also by bending failure. So, the applicability of current practice for the stability analysis of embankments founded on soft ground stabilized with DCM columns is uncertain. Therefore, the bending moment capacity of DCM columns needs to be incorporated in the stability analysis. In this study, PVA fiber has been added to improve the bending moment capacity of DCM columns. This paper presents the effects of cement contents, PVA fiber contents and lengths, and curing periods on the flexural strength characteristics of PVA fiber reinforced soil-cement mixtures through a series of third point bending tests.

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“…As one of ground improvement techniques, deep mixed (DM) columns have been commonly used as an alternative to solve deep-seated slope stability problems. Terashi (2002) indicated that "nearly 60% of on-land application in Japan and perhaps roughly 85% of Nordic applications are for the settlement reduction and improvement of stability of embankment by means of group of treated soil columns". This paper focuses on the evaluation of deep-seated slope stability of embankments over deep mixed foundations using limit equilibrium methods and a numerical solution.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Deep-Seated Slope Stability of Embankments over Deep Mixed Foundations

et al. 2004

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When embankments are constructed over soft foundations, deep-seated slope stability often becomes one of the controlling factors in design. Deep mixing methods have been commonly used as an alternative to solve the deep-seated slope stability problem. Bishop's modified method is a commonly adopted approach for analyzing the slope stability of embankments on deep mixed foundations. Bishop's modified method assumed slopes fail along a circular slip surface and the soils along this slip surface provide shear resistance. However, experimental studies have showed that deep mixed columns under a combination of vertical and horizontal forces could fail due to shearing or bending. The possible failure modes depend on the combination of the forces, the strengths of soft soils and deep mixed columns, dimensions and arrangements of deep mixed columns. Since deep mixed columns are formed by mixing a certain amount of admixture (cement or lime or a combination) with soil, they can have a wide range of strengths. A numerical method was used in this study to evaluate the factors of safety varying with the strengths of deep mixed columns and their arrangements with three rows of columns having two different thickness. MohrCoulomb failure criterion was used for embankment fill, foundation soil, and deep mixed columns. A row of deep mixed columns was modeled as a wall in 2-D for simplicity of analysis. The numerical analysis indicated that the critical slip surface of the deep-seated slope failure was not circular when the deep mixed columns were used. The factors of safety obtained using the numerical method were compared with those using Bishop's modified method and Spencer's three-part wedge method. The comparisons indicated that Bishop's modified method yielded significantly higher factors of safety than the numerical method, especially when the deep mixed columns had higher strengths. The Spencer's three-part wedge method yielded lower factors of safety than the numerical method.

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The State of Practice in Deep Mixing Methods

Cited by 60 publications

References 0 publications

Comparison of reactive magnesia- and carbide slag-activated ground granulated blastfurnace slag and Portland cement for stabilisation of a natural soil

Comparison of reactive magnesia- and carbide slag-activated ground granulated blastfurnace slag and Portland cement for stabilisation of a natural soil

Flexural Strength Characteristics of PVA Fiber Reinforced Clayey Soil-Cement Mixture

Evaluation of Deep-Seated Slope Stability of Embankments over Deep Mixed Foundations

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