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T. Himeno
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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Investigation of the safety factor and reliability of the embankment in soil cement column improved ground on Saga lowland Y. Jabeur; S. Manandhar; S. Shrestha; T. Hino; M. Mbodji; T. Himeno
Lowland Technology International Vol 20 No 4, March (2019): Special Issue on: Green Technology for Sustainable Infrastructure Develop
Publisher : International Association of Lowland Technology

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Abstract

Saga plain constitutes thick deposited soft marine clay which is susceptible for the construction of any civil engineering structures with reference to large and differential settlement problems in the area. This paper presents the case study of the Ariake sea coastal road project failure on Ashikari region in Saga lowland. In this region, the group of soil cement columns as ground improvement technique is adopted for the construction of the highway embankment. The estimation of probability of failure of the embankment on the stabilized soils is approached through the probabilistic analysis for this research. The assessments of total safety factor (Fs) and reliability rely on random variables of geotechnical parameters. These random variables considered for this study are the unit weights of the soil materials (γ) (fill and clay), the undrained shear strength (cu) in the embankment fill material and undrained shear strength of the stabilized soil and soft soil. Furthermore, the paper also delineates judgment of the geotechnical risk assessment based on real site condition.
Study on effects of specimen size of unconfined compressive strength of improved soil T. Himeno; K. Takatani; T. Hino; S. Mandhar; S. Shrestha
Lowland Technology International Vol 20 No 4, March (2019): Special Issue on: Green Technology for Sustainable Infrastructure Develop
Publisher : International Association of Lowland Technology

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Deep mixing method (DMM) is one of the countermeasures for long-term stability of the soft ground area, specifically highly applicable in coastal lowland. With the economic growth in ASEAN countries, this technology has become more popular in order to develop stable infrastructures through mega projects. In this paper, discussions are carried out through conducted laboratory mixing tests by where samples were extracted from the site in order to maintain the quality of soil-cement column by using DMM based on designed methodology. In Japan, samples are extracted continuously from the vertical direction using a thin-walled sampler. It can be connected from considering characteristics of strength development of each depth grouped into three sections from the tube into upper, middle and lower portions. However, the case of non-uniformity and the total amount of sample taken from the site is not enough, there will be the possibility to encounter a difficult situation to conduct laboratory mixing test using standard specimen size of D 50 mm × H 100 mm. Therefore, the characteristics of strengths appeared in the standard size of D 50 mm × H 100 mm laboratory mixing test is compared and discussed with newly defined laboratory test of specimen size D 25 mm × H 50 mm.
Co-Authors K. Takatani M. Mbodji S. Manandhar S. Mandhar S. Shrestha T. Hino Y. Jabeur