This paper aims at clarifying destabilization of volcanic embankments caused by piping phenomenon in which fine particles migrate within void networks. In order to accomplish the purposes, field observation of a full-scale embankment was firstly carried out. Thereafter, a series of upward seepage test was conducted to grasp features of seepage behavior in volcanic soils and to investigate effects of differences in compaction conditions on its behavior. In consideration of test results, it was shown that destabilization of soil structures due to seepage flow is derived depending on an increase of amount of finer soil particles. Additionally, internal stability of compacted volcanic soils under geometric condition was investigated based on Kenny & Lau's, Kezdi's and Li & Fannin's criteria in detail. From the results, a geotechnical evaluation was discussed for the stability of soil structures constructed by volcanic coarse grained soils subjected to seepage flow.
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