The Characteristics of Residual Strength of Silt Under Liquefaction Conditions

Silt soil is defined as a soil whose fine particles (D50 \u3c 0.005mm) content is from 3% to 15%. The Tangshan earthquake of 1976 had a magnitude of 7.8 and caused the liquefaction of silt soil in large areas in Tianjin City. The seismic intensity at Tianjin was 8° in downtown. Currently the same criterion for initial liquefaction is applied to silt and sand, e.g., the development of pore pressure, u, equal to the effective confining pressure σ0\u27. However, in silt residual strength still exists because of cohesion due to the finest of the particles even when u = σ0\u27 due to shaking. The authors employed a superimposed ring shear device to study the characteristics of residual shear strength of silts with different fine particle contents and with various pore pressure ratios, u/ σv\u27 under both dynamic and static loads