LIQUEFACTION CHARACTERISTICS OF SATURATED SAND DEPOSITS UNDER NONUNIFORM VERTICAL STRESSES

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A saturated sand deposit placed below a structure is subjected to nonuniform vertical stresses as shown in Fig. 4. It is known that there is an interesting experimental fact that a saturated sand deposit near a structure on the same horizontal plane liquefies more quickly than it below a structure. In order to clarify the liquefaction characteristics and the amount of liquefaction-induced settlement of a saturated sand deposit under nonuniform vertical stresses, a series of shaking table tests were performed on a simplified model (1), prepared in three Kjellman's type shear boxes. This model consisted of three saturated sand layers for which the effective vertical stresses σ'_<vo> were 10.4 kPa, 30.0 kPa and 49.6 kPa respectively. Similar tests were also carried out on four models (models (2) to (5)) consisting of two sand layers having different RVS values (= (σ'_<vo>)_l/(σ'_<vo>)_h), in which (σ'_<vo>)_l, (σ'_<vo>)_h represent lower and higher vertical stresses for the two respective sand layers. Since the values of RVS and k_h affect the permeability of and the transmission of pore water pressure between the sand layers, we found significant differences in liquefaction occurrence for such model sand layers. It was also found that the liquefaction-induced settlement of the model sand layer increases substantially in the range of smaller vertical stresses and remains at an almost constant value as vertical stresses increase.
社団法人地盤工学会の論文
1994-09-15

LIQUEFACTION CHARACTERISTICS OF SATURATED SAND DEPOSITS UNDER NONUNIFORM VERTICAL STRESSES

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