Abstract
Information on shear wave velocities (Vs) of soil deposits is required for solution of design earthquake motions, soil-structure interaction and wave amplification. Cross-hole logging technique gives reliable measure of in situ shear wave velocity. However, this test is expensive, requiring two closely spaced boreholes, special recording equipment and skill in identifying shear wave arrivals on a seismic record. Many empirical relations were proposed connecting Vs and soil indices. Most of these equations are based on the relation between Vs and N-value. Empirical relations for estimating the low-strain Vs using different combinations of soil indices such as N-value, depth, geological age and soil type are available. Of these, the relationship connecting Vs and all soil indices having highest correlation coefficient of 0.86 was tested for six sites with varied soil types. At these sites, in situ shear wave velocities using cross-hole technique have also been measured and SPT conducted. A modified relationship is proposed to predict Vs from soil indices and is found to give better estimates of shear wave velocity.
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