Centrifuge model tests at Zhejiang University for LEAP-Asia-2019 and validation of the generalized scaling law

摘要

In the program of LEAP-Asia-2019, three dynamic centrifuge model tests on a 5-degree sloping ground composed of saturated Ottawa F-65 sand have been conducted at Zhejiang University to validate the generalized scaling law (GSL) by using the technique of "modeling of models". Firstly, the advantages and possible limitations of the generalized scaling law are revisited. Then a new scaling relation (GSR) treating the stiffness instead of the strain as an independent scaling factor is proposed in the frame of the generalized scaling law, and it further considers the effect of modulus reduction over wide strain range. Shear wave velocities of three models measured by bender elements and non-destructive step wave are analyzed to check the validity of Iai's Type II GSL at small strain range, and the response of acceleration, excess pore water pressure and displacement are analyzed to validate Iai's Type II GSL at large strain range. This study shows that Iai's Type II GSL generally applies well for small strain conditions and even the dynamic response of acceleration and pore pressure, but will introduce considerable errors for dissipation time and permanent displacement under large strain conditions. The proposed GSR exhibits better performance for all model tests from small to large strain levels.