Geotechnical Characteristics of Volcanic Soils Taken from Recent Eruptions |
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| Authors: | Rolando P Orense Andrew Zapanta Jr Akinori Hata Ikuo Towhata |
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| Institution: | (1) Chuo Kaihatsu Corporation, 3-13-5 Nishi-Waseda, Shinjuku Tokyo, 169-8612, Japan;(2) Department of Civil Engineering, University of Tokyo, Japan;(3) Department of Civil Engineering, Chiba Institute of Technology, Japan;(4) Department of Civil Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku Tokyo, 113 8656, Japan |
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| Abstract: | Recent volcanic eruptions at Mt. Unzen (Japan) in 1990 and Mt. Pinatubo (Philippines) in 1991 produced voluminous amounts
of ash and sediments which inundated widespread areas. In later rehabilitation and reconstruction, it is practical and economical
to use these freshly deposited sediments as materials for foundations and embankments. However, the geotechnical properties
of young volcanic products have not been fully investigated. Accordingly, we investigated the geotechnical characteristics
of volcanic soils associated with three recent eruptions, namely, the Unzen and Izu-Oshima eruptions of 1990 and 1986, respectively,
in Japan and the Pinatubo eruption of 1991 in the Philippines. We specifically investigated index properties, permeability
and compaction characteristics, and strength and deformation behavior in drained conditions. Additionally, we examined the
dynamic properties and liquefaction characteristics of samples taken from Mt. Pinatubo. The results showed that the geotechnical
characteristics of the deposits generally varied with the sampling sites. Depending on the location, either upstream or downstream
from a volcano, the preferential sizing due to alluvial deposition affects engineering properties of the deposits. For example,
volcanic sediments upstream from Mt. Pinatubo have high compressibility and low cyclic strength, whereas those taken downstream
show dilative tendencies and high liquefaction strength. |
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| Keywords: | deformation geotechnical characteristics strength torsional shear volcanic |
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