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Revisit to Liquefaction of Gravelly Soils Compared with Sandy Soils
Natural gravelly soils liquefied from time to time during previous earthquakes were all well-graded and of much higher dry density than poorly-graded sands, though their S-wave velocity Vs and SPT N-value were as low as liquefiable sands. A series of systematic pressure chamber tests conducted on a set of granular soils indicate that N and Vs of well-graded gravels are correlated with soil densities quite differently from those of sands and highly dependent on grain-size curves or uniformity coefficient Cu. In laboratory triaxial tests, CRR-values for well-graded gravelly soils corresponding to the initial liquefaction, for axial strain εDA=5%, are not much different from those for poorly-graded sands of the same relative density. On the other hand, post-liquefaction residual strength for larger strains, ε=20% for example, is obtained about 10 times larger than poorly-graded sands indicating that gravelly soils are much more resistant to post-liquefaction large-strain failures. CRR~N correlations for gravelly soils developed by triaxial tests on intact samples and liquefaction case-histories are discussed in view of the basic laboratory test results.
Revisit to Liquefaction of Gravelly Soils Compared with Sandy Soils
Natural gravelly soils liquefied from time to time during previous earthquakes were all well-graded and of much higher dry density than poorly-graded sands, though their S-wave velocity Vs and SPT N-value were as low as liquefiable sands. A series of systematic pressure chamber tests conducted on a set of granular soils indicate that N and Vs of well-graded gravels are correlated with soil densities quite differently from those of sands and highly dependent on grain-size curves or uniformity coefficient Cu. In laboratory triaxial tests, CRR-values for well-graded gravelly soils corresponding to the initial liquefaction, for axial strain εDA=5%, are not much different from those for poorly-graded sands of the same relative density. On the other hand, post-liquefaction residual strength for larger strains, ε=20% for example, is obtained about 10 times larger than poorly-graded sands indicating that gravelly soils are much more resistant to post-liquefaction large-strain failures. CRR~N correlations for gravelly soils developed by triaxial tests on intact samples and liquefaction case-histories are discussed in view of the basic laboratory test results.
Revisit to Liquefaction of Gravelly Soils Compared with Sandy Soils
Kokusho, Takaji (author)
Geotechnical Earthquake Engineering and Soil Dynamics V ; 2018 ; Austin, Texas
2018-06-07
Conference paper
Electronic Resource
English
Revisit to Liquefaction of Gravelly Soils Compared with Sandy Soils
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