Study on the Characteristics of Effective Internal Friction Angles of Silty Clay from the Yellow River Delta and the Inverse Method of CPTu Testing

This study focuses on the silty clay of Yellow River Delta, conducting laboratory experiments to explore strength characteristics typical in Delta. The utilizes CPTu calibration chamber tests systematically reveal features cone tip resistance (qt), side friction (fs), and pore water pressure (u2) clay. research provides a theoretical basis for Delta investigation region. compares applicability existing inversion methods highlights NTH method’s advantages evaluating clay’s effective internal angle. Supported by indoor tests, confirms reliability method estimating angle under normally consolidated conditions while also identifying its limitations. These findings offer data support situ rapid accurate estimation design parameters, like undrained shear Moreover, they provide insights obtaining other crucial data.