Experimental Determination of Softening Relations for Cement-Treated Sand

Namikawa, Tsutomu; Koseki, Junichi

doi:10.3208/sandf.46.491

Cited by 19 publications

(20 citation statements)

References 25 publications

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“…This microscopic observation suggested that, during the softening process, the tensile crack can not be observed visually just after the peak stress, but after the development of the large strain. In the bending tests, the visible tensile crack has not appeared until the load dropped to as little as 50z of the peak load, when the opening crack displacement was about 0.05 mm (Namikawa and Koseki, 2006).…”

Section: Interpretation Of Inspection Results In Case History Based Omentioning

confidence: 99%

“…Parameters for the cementtreated soil with the unconˆned compression strength qu＝2 MPa (analysis 2b) were determined using laboratory test results (Mihira et al, 2003;Namikawa and Koseki, 2006;Namikawa and Mihira, 2007). Assuming that the elastic modulus E, the cohesion c, the tensile strength Tf, and the fracture energy Gf were proportional to qu, these values for the cement-treated soil with qu＝5 MPa were evaluated from those for the cement-treated soil with qu＝2 MPa.…”

Section: Fe-analysis Of Ground Improvementmentioning

confidence: 99%

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Finite Element Analysis of Lattice-Shaped Ground Improvement by Cement-Mixing for Liquefaction Mitigation

Namikawa

Koseki

Suzuki

2007

Soils and Foundations

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Section: Interpretation Of Inspection Results In Case History Based Omentioning

confidence: 99%

Section: Fe-analysis Of Ground Improvementmentioning

confidence: 99%

Finite Element Analysis of Lattice-Shaped Ground Improvement by Cement-Mixing for Liquefaction Mitigation

Namikawa

Koseki

Suzuki

2007

Soils and Foundations

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“…Therefore, in the bending tests, since the tensile stress decreases gradually in the softening zone where the stress reaches the tensile strength, the external load can increase even after the stress reaches the tensile strength in a part of the specimen. It was clariˆed recently that the cement-treated sand also exhibits strain-softening behavior after the tensile peak stress state (Namikawa and Koseki, 2006). As with concrete, therefore, by taking account of the tensile softening behavior, we might explain the diŠerences of tensile strength evaluated by the bending and the direct tension test results on cementtreated soils.…”

Section: Introductionmentioning

confidence: 99%

“…The fracture energy Gf, which dominates the tensile softening behavior, is also important for evaluating not only the softening relation but also the peak load. The value of Gf was obtained from the results of three-point bending tests on the notched beam of 160 mm in span length, 40 mm in depth and 40 mm in width (Namikawa and Koseki, 2006). The notch was located at the central span, and its length was equal to half the beam depth.…”

Section: Materials Parametersmentioning

confidence: 99%

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Evaluation of Tensile Strength of Cement-Treated Sand Based on Several Types of Laboratory Tests

Namikawa

Koseki

2007

Soils and Foundations

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There exist diŠerences in the values of the tensile strength of cement-treated soils among results from direct tension, splitting tension, and bending tests. This paper presents numerical simulations that serve to explain such diŠerences in the tensile strength properties obtained from the three types of tests. Finite element (FE)-analyses were performed to simulate the three tests as boundary value problems. A simple elasto-plastic model that simulates the behavior of cement-treated sands under a general three-dimensional stress state was used for these analyses. The analytical results showed that the direct tension tests yield reliable values of the actual tensile strength that will be mobilized under an ideal condition of uniaxial tension. On the other hand, in the splitting tension and bending tests, the tensile strength values are calculated from an external load by assuming a linear-elastic behavior in estimating the stress distribution. However, these values do not correspond to the actual tensile strength. The splitting tensile tests underestimate the tensile strength because the shear failure occurs below the loading strip and restrains further increase of the applied load. On the other hand, the bending tests overestimate the tensile strength because of the redistribution of stresses induced by the strain-softening behavior on the tensile side.

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Numerische Studien zur Sicherung von Baugruben und Geländesprüngen mit Stützscheiben

Marte¹,

Choosrithong²,

Schweiger³

2020

Geotechnik

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In diesem Beitrag wird die innere und äußere Tragwirkung von Sicherungen von Geländesprüngen mittels Stützscheiben bzw. schalenartig wirkenden Tragwerken numerisch untersucht. Solche Lösungsansätze zur Sicherung, z. B. von Baugrubenböschungen, können zum Einsatz kommen, wenn der Einbau von Zugelementen wie Anker oder Nägel, z. B. aufgrund von eingeschränkter Nutzbarkeit von Nachbargrundstücken, nicht möglich oder gewollt ist. Stützscheiben können durch überschnittene Großbohrpfähle, DSV‐Säulen oder Einmischelemente hergestellt werden. Der Nachweis der äußeren Tragfähigkeit erfolgt dabei im Allgemeinen durch ein vereinfachtes analytisches Verfahren, der sog. Palisadentheorie. Ein Nachweis der inneren Tragfähigkeit ist mit analytischen Verfahren praktisch kaum möglich. In den in diesem Beitrag diskutierten numerischen Untersuchungen wird das große Optimierungspotenzial derartiger Tragsysteme in Bezug auf die äußere Tragfähigkeit aufgezeigt, und auf Basis geeigneter Stoffmodelle für Boden und Baumaterial für die Stützscheiben wird die innere Tragwirkung derartiger Systeme eingehend diskutiert. Zusammenfassend wird aufgezeigt, dass bei Anwendung dreidimensionaler numerischer Berechnungsmethoden mit geeigneten Stoffmodellen, ein großes Einsparungspotenzial in der Dimensionierung derartiger Stützsysteme möglich ist.

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Experimental Determination of Softening Relations for Cement-Treated Sand

Cited by 19 publications

References 25 publications

Finite Element Analysis of Lattice-Shaped Ground Improvement by Cement-Mixing for Liquefaction Mitigation

Finite Element Analysis of Lattice-Shaped Ground Improvement by Cement-Mixing for Liquefaction Mitigation

Evaluation of Tensile Strength of Cement-Treated Sand Based on Several Types of Laboratory Tests

Numerische Studien zur Sicherung von Baugruben und Geländesprüngen mit Stützscheiben

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