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All Journal Lowland Technology International
T. Takeyama
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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SOIL / WATER COUPLED ANALYSIS FOR CONSTRUCTION MANAGEMENT OF HIGHWAY EMBANKMENTS ON SOFT CLAY T. Takeyama; T. Ishigaki; T. Mizuta; H. Ohta
Lowland Technology International Vol 11 No 2, Dec (2009)
Publisher : International Association of Lowland Technology

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Abstract

In the limited budget of highway construction, it is necessary to carry out the construction management which systematically utilizes management resources. This paper presents the applicability of soil / water coupled FE analysis for use in construction management of highway embankment on soft clay. At the first stage of analysis, the computer simulations of existing highway embankments on soft marine clay are conducted to verify their predictability. The constitutive model used in the analysis is an elasto-viscoplastic model proposed by Sekiguchi and Ohta (1977). At the second stage, the simulations of construction sequences, as case studies, with slow to fast banking rates are trialed to find better alternatives. It is a main point of the proposal to perform a construction management by fully utilizing the result of simulations for checking the stability of the foundation during construction.
The influence of soil disturbance on material properties and micro-structure of cement-tretaed soil M. Makino; T. Takeyama; M. Kitazume
Lowland Technology International Vol 17 No 3, Dec (2015)
Publisher : International Association of Lowland Technology

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The Pneumatic Flow Mixing Method was developed in Japan, in which dredged soft soil is mixed with small amount of chemical binder, usually cement, in a pipe during transporting by compressed air. In some applications, the stabilizied soil is temporary placed at provisional spaced, and is excavated and reclaimed at the final site due to several reasons. In the cases, the stabilized soil in which the chemical reaction has already proceeded is disturbed during the excavation and transportation processes, which causes considerable decrease in the strength at the final state. It is important to investigate the soil disturbance effect for its further applications. The authors have started a research project to investigate the soil disturbance effect on the mechanical properties of cement stabilized soil. The unconfined compression tests were perfomed on three types of laboratory mixed cement stabilized Kaolin clay, stabilized soil without disturbance and disturbed after 3 or 7 days curing. The study revealed that the soil disturbance influenced the stress – strain behavior of the soils considerably. In this paper, a part of the on-going research results is presented as well as the soil preparation and test procedure.
Co-Authors H. Ohta M. Kitazume M. Makino T. Ishigaki T. Mizuta