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Unformatted text preview: o Cone Penetrometer Test (CPT) - measurement of bearing on tip of cone, correlate with modulus, use strain factor method, can be conservative but good field data precision ..... I ! ax, (Jy, a z, E z P i due to surface load Sand Schmertmann Strain Factor Method (CPT): o Widely used in practice today to estimate settlement under center of footing. o Mixture of rational & empirical basis o Typicaliy conservative (overestimate settlement) o Backed by field and model observations o Originally proposed 1970, based on UF research o Revised 1978 for spread & strip footings, time effects, and updated E vs. q, correlation o Method uses linear-elastic theory for a half-space: where: z E 11 Ox Oy z = strain in the z direction = Young's modulus = Poisson's ratio = stress increase in the x direction = stress increase in the y direction = stress increase in the z direction...
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- Fall '08