摘要
Soil liquefaction occurs when pore water pressure of low cohesion materials equals or exceeds the effective confining pressure. Sudden increases in pore water pressure may occur in response to dynamic loads, such as earthquake shaking, or shear strain engendered by sudden movement （static liquefaction）. This study focused on the evaluation of the liquefaction potential of silty soils using CPT （cone penetration test） data. There is much less CPT data on the behavior of silts under dynamic loading, as compared to sandy soil mixtures. Robertson and Wride proposed a method of evaluating liquefaction evaluation for silt-sand mixtures using CPT data, when the soils contain less than 35% fines. Until more research is conducted, soils comprised of more than 35% fines cannot be reliably evaluated using CPT data alone. This is true for isolated silts or silt mixtures, which require laboratory testing to evaluate their liquefaction potential. Experience has shown that soils with 〉 35% silt can liquefy if drainage is retarded or severely restricted by bounding low permeability horizons, such as silty clays or clayey silts, which prevent dissipation of dynamically induced pore water pressures.
