Sampling disturbance effects in reconstituted coastal soils.

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The effects of tube sampling disturbances on undrained shear properties of reconstituted samples of coastal soils were investigated. The values of undrained shear strength (su), initial tangent modulus (Ei) and secant modulus (E50) were reduced while axial strain at peak deviator stress (εp) increased because of disturbance caused by the penetration of samplers. Disturbances also considerably reduced initial effective stress (δ'i) and pore pressure changes. The changes in soil parameters between the "in-situ" and "tube" samples depended markedly on the characteristics of the tube samplers. Values of su, Ei, E50 and δ'i decreased while the values of εp increased with increasing area ratio (or decreasing external diameter to thickness ratio) of the samplers. It was also found that the reductions in the values of su, εp, Ei, E50 and δ'i increased with decreasing plasticity of the soils. A number of reconsolidation procedures, both isotropic and anisotropic including SHANSEP methods, were adopted in order to assess the suitability of reconsolidation of "tube" samples to recover the "in-situ" properties of the soils. It appeared that reconsolidation using SHANSEP procedures may not be applicable to these coastal soils. However, K0-reconsolidation to "in-situ" stresses provided a better estimate of "in-situ" properties than other reconsolidation techniques.

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