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- W2197950977 abstract "The analysis of seismic refraction is presented for uniformly deposited soil strata of constant density and Poisson's ratio and stiffness increasing continuously with depth due to differential compaction effects. Analytical expressions for the surface-to-surface travel time as well as for the depth to maximum penetration are presented for realistic functions of the variation of the soil stiffness with depth. Approximate formulas are also given for practical use in nondestructive subsoil investigation. The results may be used either to determine in-situ elastic soil properties directly from refraction surveys or to support and verify conventional surface wave vibration tests. INTRODUCTION Although dispersion measurements have gained in popularity during the last decade, seismic refraction surveys still offer an attractive adjunct to the determination of in situ stiffness parameters. In civil engineering the method is mainly applied to determine wave propagation velocities and layer thicknesses in a soil stratum. The theory and exploration techniques are well known as described e.g. by Dobrin* or Woods. Even for a non-layered soil, however, the assumption of a constant wave velocity is no longer valid due to the dependence of soil stiffness on overburden pressure. This effect has to be taken into account in order to properly interpret the experimental time-distance curves. Because of its simplicity a linear depth-function has been widely used to represent the variation of wave velocity in sedimentary strata, e.g. Abbiss For an approximately constant mass density -which is a reasonable assumption for this type of stratumthis function leads to a quadratic depth-variation of Transactions on the Built Environment vol 3, © 1993 WIT Press, www.witpress.com, ISSN 1743-3509" @default.
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- W2197950977 date "1970-01-01" @default.
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- W2197950977 title "Seismic Refraction Survey For Continuously Nonhomogeneous Soils" @default.
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- W2197950977 doi "https://doi.org/10.2495/sdee930021" @default.
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