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D. Matsumoto
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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Geotechnical damage due to the 2016 Kumamoto Earthquake and future challenges H. Hazarika; T. Kokusho; R.E. Kayen; S. Dashti; H. Fukuoka; T. Ishizawa; Y. Kochi; D. Matsumoto; H. Furuichi; T. Hirose; T. Fujishiro; K. Okamoto; M. Tajiri; M. Fukuda
Lowland Technology International Vol 19 No 3, Dec (2017)
Publisher : International Association of Lowland Technology

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The 2016 Kumamoto earthquake with a moment magnitude of 7.0 (Japanese intensity = 7) that struck on April 16 brought devastation in many areas of Kumamoto Prefecture and partly in Oita Prefecture in Kyushu Region, Japan. The earthquake preceded a foreshock of magnitude 6.5 (Japanese intensity = 7) on April 14. This paper summarizes the damage brought to geotechnical structures by the two consecutive earthquakes within a span of twenty-eight hours. The paper highlighted some of the observed damage and identifies reasons for such damage. The geotechnical challenges towards mitigation of losses from such earthquakes are also suggested.
Deformation and failure characteristics of Volcanic soil at landslides site due to the 2016 Kumamoto Earthquake W. O. Sumartini; H. Hazarika; T. Kokusho; S. Ishibashi; D. Matsumoto; B. Chaudhary
Lowland Technology International Vol 19 No 4, March (2018)
Publisher : International Association of Lowland Technology

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A chain of earthquakes with a maximum moment magnitude of 7.3 MW struck Kumamoto prefecture and its vicinity from April 14-16th, 2016. It generated widespread landslides not only on steep slopes but also on gentle slopes. The landslides caused huge damages to nature, infrastructure, and loss of lives. Thus, it is crucial to determine the failure mechanism of those slopes which were formed by volcanic soil and to elucidate the effect of cyclic loading on strength characteristics of the soil. A series of investigations of the soil, which is orange colored, was conducted. Undrained static and cyclic triaxial tests were performed. Also, x-ray powder diffraction test, x-ray fluorescence test, and scanning electron microscope test were performed for further understanding of the material behavior. The triaxial test revealed semi dilative behavior under monotonic loading with small confining stress and contractive behavior on high confining stress. In the cyclic triaxial tests under in situ confining stress, cyclic mobility by lower cyclic stress and flow failure by higher cyclic stress was observed. Also, soil fabric, chemical composition, and mineral composition, which describe the deformation behavior and failure characteristics of the soil has been reported.
Analysis of liquefaction of volcanic soil during the 2016 Kumamoto Earthquake based on boring data K. Ogo; H. Hazarika; T. Kokusho; D. Matsumoto; S. Ishibashi; W. O. Sumartini
Lowland Technology International Vol 19 No 4, March (2018)
Publisher : International Association of Lowland Technology

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On April 16th, 2016 Kumamoto earthquake registering 7 on Japanese scale caused liquefaction in many places around Kumamoto plain. However, considering the magnitude and the distance from the hypocenter, the liquefaction-induced damage was not so huge. Most of sand boiling was observed where liquefaction is likely to happen such as near waters and on an old river channel. In addition, black sand which seems to be volcanic soil was observed as ejecta of liquefaction in many places. This paper deals with the liquefaction characteristics of volcanic soil through physical and mechanical testing, microscopic observation by SEM and liquefaction susceptibility evaluation based on boring data. According to the physical testing, the grain size distribution was typical of liquefaction susceptible sand. Many of sand boils happened on the alluvial ground, and the thick strata of volcanic soil were found there. Based on the results of liquefaction evaluation, some locations have shown the liquefaction susceptibility in spite the fact that little occurrence of liquefaction took place at those locations.
Investigation of slopes on the Takanoobane lava dome using the resistivity imaging method Y. Kochi; T. Kariya; D. Matsumoto; T. Hirose; H. Hazarika
Lowland Technology International Vol 19 No 4, March (2018)
Publisher : International Association of Lowland Technology

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In the Kumamoto earthquake in 2016, landslides occurred in many place on moderately inclined slope in the Takanoobane lava dome. In this research, we focus on the orange-colored pumice layer (Kpfa), which is predisposed to the landslide, and show the distribution using the resistivity imaging method on a slope where no landslide has occurred. According to the survey results, the slope without the landslide was observed when the slope was hard to slip mechanically due to the Kpfa layer was distributed in a shallow place or paleogeography of the foundation layer surface (Takanoobane lava)
Co-Authors B. Chaudhary H. Fukuoka H. Furuichi H. Hazarika K. Ogo K. Okamoto M. Fukuda M. Tajiri R.E. Kayen S. Dashti S. Ishibashi T. Fujishiro T. Hirose T. Ishizawa T. Kariya T. Kokusho W. O. Sumartini Y. Kochi