LIQUEFACTION RESISTANCE OF TWO ALLUVIAL VOLCANIC SOILS SAMPLED BY IN SITU FREEZING

概要

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Two new improved-efficiency techniques for soil sampling by in situ freezing were used to obtain undisturbed samples of saturated alluvial volcanic soils, locally termed "Shirasu", from Kagoshima city, Japan. Undrained cyclic triaxial tests were conducted on the undisturbed alluvial Shirasu samples obtained from a depth of 5.4 to 6.0 m at site A, and from a depth of 8.4 to 10.5 m at site B, after they had been thawed. For studying the effects of sample disturbance, undrained cyclic triaxial tests were also conducted on the reconstituted specimens. The liquefaction resistance in the field was estimated based on the laboratory tests. Based on the above studies it was shown that (1) two new developments in the technique of sampling by in situ freezing were successfully achieved in the field, and (2) compared with the liquefaction resistance of the undisturbed samples, that of the reconstituted samples from site A, all of which had about the same density, was about 45 to 50% of the value for undisturbed samples, and that of the reconstituted samples from site B, with relative density 13 to 20 percentage points higher than that of undisturbed samples was about 62 to 67%.
社団法人地盤工学会の論文
1985-09-15