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The rigidity index is defined as the ratio of shear modulus to shear strength (IR = G/τmax) and serves as an important input parameter for geotechnical applications involving bearing capacity, pile driving, porewater pressure generation, and dissipation problems. First, a hybrid formulation of spherical cavity expansion and critical state soil mechanics (SCE-CSSM) for obtaining the operational undrained IR from piezocone penetration (CPTu) data is introduced, and the approach is extended to evaluate IR using flat plate dilatometer test (DMT) data based on an established link between the DMT and piezocone (CPTu) data in soft-firm clays. This IR can be used to estimate profiles of overconsolidation ratio (OCR) and undrained shear strength (su) of soft to firm clays using the same SCE-CSSM framework. Two case studies covering well-behaved clays with different geologies from the UK and USA are used to demonstrate the effectiveness of the proposed methodology for obtaining IR, OCR, and su.
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