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Elastic Shear Modulus of Compressible Chicago Clay
김태식,Richard J. Finno 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.7
This paper summarizes the results and analyses of laboratory and field measurements of the elastic shear modulus of lightly overconsolidated, compressible Chicago clays. These soils are glacially-derived, freshwater ice margin deposits. The laboratory experiments were conducted on twelve high quality block samples obtained from three excavation sites in the Chicago area. The specimens were consolidated to in situ stresses via a recompression technique, and the elastic shear modulus was synchronously obtained from results of bender element tests during consolidation and subsequent creep. Seismic cone penetration and crosshole seismic tests were performed in situ. The results show that the elastic shear moduli from the bender element tests after consolidation and a sufficiently-long creep period are approximately the same as those obtained from the results of the in situ tests. The effects of time on the elastic shear modulus are smaller than the effects caused by soil variability. Evaluation of the laboratory and field data indicates that the elastic shear modulus of compressible Chicago clays can be estimated from the natural water content and mean normal effective stress.
Arboleda-Monsalve, Luis G.,Teng, Fuchen,Kim, Taesik,Finno, Richard J. American Society of Civil Engineers 2017 Journal of geotechnical and geoenvironmental engin Vol.143 No.7
<P>Numerical simulations and calibration of hypoplasticity constitutive parameters for Chicago clays are presented based on laboratory tests conducted on high-quality block samples and field tests from excavations located in the Chicago, Illinois area. The parameters for the hypoplasticity model enhanced with the intergranular strain concept are calibrated from the results of index tests, oedometer tests, and K0-consolidated undrained triaxial compression and extension tests. Drained stress probes conducted in a triaxial cell after three different preshearing stress paths were used to compare the numerical results with the triaxial test results. One path was applied to study the clay stress-strain behavior at in situ conditions and the remaining two to isolate the effects of recent stress history. The results are shown in terms of the secant shear and bulk stiffness, shear and volumetric stress-strain responses at small and large strains, and stress path reversals.</P>