Nonlinear Settlement Calculation of Composite Foundation Based on Tangent Modulus Method: Two Case Studies

The tangent modulus method of undisturbed soil is a new in settlement calculation, which mainly applied to hard with strong structure, such as silty clay, completely weathered rock, and granite residual an SPT blow count greater than 8. obtained from field plate load test, can consider the influence stress level reflect nonlinear characteristics foundation settlement. In multi-layer foundation, since deep loading test difficult, was proposed determine soil. It assumed that ratio initial deformation equal unloading–reloading Eurref secant E50ref by triaxial test. Since there are corresponding empirical formulae for counts different types soils many regions, be derived above method. two cases composite compression were used calculate then compared measured results. results show determining feasible theory, calculating accuracy significantly higher traditional modulus.