INVESTIGATION ON PREDICTION METHODS AND CHARACTERISTICS OF EARTHQUAKE-INDUCED LIQUEFACTION OF SILTY SOIL IN THE YELLOW RIVER DELTA

Earthquake-induced liquefaction may occur in the Yellow River Delta for the great deal of silty soil.Four typical areas formed in different sedimentary periods are investigated by methods of standard penetration test(SPT),cone penetration test(CPT) and shear wave velocity test(SWVT),to analyze the prediction methods and characteristics of liquefaction.It has been shown that synthetically using the methods of SPT and CPT is suitable for estimating the liquefaction.In the Yellow River Delta areas,liquefaction mainly occurred in the silty soil with depth of 1–5 m containing clayey particles of 10%–15%(in weigh).The initial criterion of predicting liquefaction is suggested,which should consider depth of the silty soil and in the same time,the critical percent content of clayey particles to liquefaction should be adjusted.