Mechanical behavior of decomposed granite soils in Hokkaido and its evaluation

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  • 北海道に分布する風化残積土の物理・力学挙動とその工学的評価

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<p>The Hokkaido heavy rainfalls due to Typhoon 7th, 11th, 9th and 10th in 2016 caused floods of rivers, slope failure and debris flow. In particular, serious geotechnical damages were induced in Hidaka district, for example collapses of road embankments and cut slopes and road facilities. This paper describes geotechnical characteristics of decomposed granite and periglacial soils sampled from the Nissho mountain pass and Hokkaido Odan Express-way (Do-to-do). A series of site investigation and laboratory tests for physical mechanical properties were performed on the soils materials. In consideration of test results, it was found that soil layers of weathering residual granite soils specified into problematic soils were observed in disaster areas and that the mechanical behavior was changed depending on the degree of weathering (environmental conditions). In order to evaluate geotechnical evaluation of soil materials having particle breakage, the mechanical behavior of the decomposed granite soils was compared with those of volcanic coarse grained soils with particle breakage. Based on the results, a geotechnical evaluation method was also discussed in this study.</p>

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