Abstract
In order to obtain practically a correction factor of the liquefaction resistance of saturated soils for the reduction of membrane penetration during cyclic triaxial test, LRm, the relationships between LRm and uniformity coefficient Uc are investigated. Here LRm={(σd/2 σ'30)nc-(σd/2 σ'30)c}/(σd/2 σ'30)nc×100, in which (σd/2 σ'30)nc and (σd/2 σ'30)c denote the stress ratios before and after the correction for the reduction of membrane penetration, respectively. Samples used are two kinds of sands and two kinds of decomposed granite soils, having uniformity coefficients of l.68, 1.83, 6.40, and 28.92 respectively. Membranes are three kinds of latex rubber ones with thicknesses of O.18mm, O.25mm, and O.60mm respectively. From the tests it was found that our correction method (Ohara and Yamamoto, 1981, 1982) is valid, and LRm increases with the value of logarithm of Uc for the cases when the number of cycles required to cause liquefaction NL is in the region of 10∼50. In the case, for example, of NL=10, the values of LRm are 8%, 16%, and 28% respectively for Uc= 2, 5, and 25. Furthermore, it was found that the strength effect of membrane on the liquefaction resistance of the soils can be ignored.
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