APPLICABILITY OF THE SMALL DIAMETER SAMPLER FOR NIIGATA SAND DEPOSITS

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Applicability of tube sampling for Niigata sand deposits is discussed through bender element and cyclic triaxial tests for samples obtained from two-chambered hydraulic piston samplers (Shogaki, 1997) with inner diameters of 48mm and 50mm, a one-chambered 70mm diameter sampler, a 125-mm rotary triple-tube sampler and the frozen (FS) sampling method (Yoshimi et al., 1989). The relationship between the relative density (D_r) and normalized SPT N-value (N_1) obtained from small diameter samplers with inner diameters of 45mm and 50mm samplers was close to that of the FS and the N_1 coefficient was greater than those of the 70-mm and other tube samplers. The stress ratio at 20 cycles (R_<L20>) and the initial modulus of rigidity (G_<CTX>) of samples obtained from the 45-mm and 50-mm samplers were greater than those of the 70-mm, 125-mm rotary triple-tube and other tube samplers. However, the R_<L20> values obtained from the 45-mm and 50-mm samplers were smaller than those of the FS sampler in the area of N_1>24. The G_<BE> and G_<CTX> values obtained from the 45-mm and 50-mm samplers were close to those of the FS sampling. Therefore, the 45-mm and 50-mm samplers can take equally high quality samples for Niigata sand deposits.
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