As a fundamental mechanical index,shear wave velocity(denoted V,)can be used to discriminate soil seismic liquefaction.A new liquefaction critical curve is proposed based on the hyperbolic and power model,by using the seismic site data from Kayen.The reliability of the critical formula and three domestic representative Vs-based methods are compared and verified by the seismic liquefaction database.The applicability of the new critical curve to extend down to the deep layer is analyzed on the basis of the vibration triaxial tests.The results show that the critical formula optimizes the discrimination success rate,and its liquefaction discrimination success rate is over 95％,and the non-liquefaction discrimination success rate is acceptable.It avoids the phenomenon that the liquefaction discrimination is unsafe at low intensity and too conservative at high intensity.It is proved that the new liquefaction triggering curve can be appropriately extended to 20m or more.The new liquefaction triggering formula can be used as a complementary and alternative method to the Chinese Code.
维普
万方数据