Predictive Model for Normalized Shear Modulus of Cohesive Soils
نویسندگان
چکیده
called maximum shear modulus, Gmax. It can be determined by in-situ methods from the measurements of the shear wave velocity, Vs, by means of crosshole, down-hole, up-hole, or surface wave testing. The relationship between maximum shear modulus and shear wave velocity is rigorous: 2 max s G V where ρ is soil density. This parameter can be also obtained in laboratory by resonant column or bender element tests. Estimation of the dynamic properties (shear modulus, G, and damping ratio, D, of soils has become the scope of many studies in the field of geotechnical earthquake engineering using devices such as resonant column, cyclic simple shear, cyclic torsional shear and cyclic triaxial (e.g., Hardin and Drnevich, 1972a; Tatsuoka et al., 1979; Yoshimi et al., 1984; Wilson, 1988; Saxena and Reddy, 1989; Yasuda and Matsumoto, 1993; Konno et al., 1994; Lanzo et al., 1997; Menq, 2003; Hardin and Kalinski, 2005; Xenaki and Athanasopoulos, 2008; Senetakis et al., 2012a; Senetakis et al., 2012b). Many studies have been conducted to characterize the factors that affect normalized shear modulus (G/Gmax) and damping ratio (D) of soils (e.g., Richart et al., 1970; Hardin and Drnevich, 1972b; Vucetic and Dobry, 1991; Ishibashi and Zhang, 1993; Darendeli, 2001; Stokoe et al., 1994, 2004). Based on these studies, the most important factors that affect G/Gmax of cohesive soils include shear strain (γ), effective confining pressure (σ’0), and plasticity index (PI). Other parameters have less important effect.
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