Simulated Ground Response Using Non-Linear Elastic Moduli.
Final rept. 17 Aug 84-14 Feb 85,
WESTON GEOPHYSICAL CORP WESTBORO MA
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This report discusses procedures for the extrapolation of low-strain seismic measurements made at a specific site to predict the site response under earthquake loading conditions. Because of the non-linear relation between stress and strain exhibited by soils at strain levels exceeding about 0.000001, a program to determine dynamic soil properties at low to high strain levels and at different depths in the soil column at the site is required. Utilizing recent advances in field measurement techniques, this goal can be best accomplished with a combination of in situ geophysical methods, including surface reflection and refraction methods cross-hole and down-hole techniques utilizing impulsive and vibratory sources and dynamic loading methods involving monitoring of in-place deformation. Knowledge of the variation with strain level and other factors of equivalent moduli and damping at a site may enable frequency-dependent scaling rules to be developed for the computation of high-strain response from microseismic response curves. This procedure can be evaluated by performing field measurements at sites for which comprehensive strong motion data bases are already available. Keywords Modulus of elasticity. Author
- Soil Mechanics