8/30/2023 0 Comments Schmertmann settlement program![]() ![]() The strain influence factor I z increases linearly from zero at the bottom of the footing to a maximum of 0.6 at a depth of ½ B below the footing where B is the footing width. 1970 formulation This is described in Schmertmann (1970). There are two possible formulations for I z the original 1970 approximation and the improved 1978 approximation. Influence factors The influence factor, I z is based on an approximation of strain distributions below the footing. The equation for settlement is: Where C 1 = the correction to account for strain relief from excavated soil, σ cd' = effective overburden pressure at bottom of the footing Δ P = the net applied footing pressure (equation) C t = correction for time-dependent creep, t = time (years) E si = one-dimensional elastic modulus of soil layer i Δ z i = thickness of soil layer I zi = the influence factor at the centre of soil layer i as described below. A time factor can also be included to account for time dependent (creep) effects. The method proposed a simplified triangular strain distribution and calculates the settlement accordingly. Schmertmann method The Schmertmann method () calculates settlement from layer stiffness data or cone tip bearing resistances, q c obtained from a Cone Penetration Test (CPT). ![]()
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