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To study the small strain shear modulus ( G  max ) of saturated sand-silt mixed soil materials, a series of tests were conducted using the bender element apparatus, and the influences of fines content ( FC ), relative density ( D  r ), and effective confining pressure (σ'3c) were taken into consideration. The test results indicate that the G  max of the mixed soil materials decreases first and then increases with the FC up to 100% with D  r = 35% and 50%, while the G  max decreases with the increasing FC when D  r = 60%. Moreover, for a given D  r , the G  max increases with the increasing σ'3c, and the increase rate keeps constant under various FC s. The G  max of specimens under various FC s decreases with the increase of the void ratio ( e ). The decrease rate between the G  max and e differs when the σ'3c is given, which is influenced by the FC . The G  max of the mixed soil materials can be evaluated by the Hardin model when the FC is determined. The best-fitting parameter A of the Hardin model first decreases and then increases as FC increases. The revised Hardin model, considering the influence of FC , σ'3c, and e , can be used to evaluate the G  max for different types of sand-silt mixed soil materials. The error between the evaluated and tested G  max is less than 10%.

Experimental Study on the Gmax Characteristics of the Sand-Silt Mixed Soil Materials Using Bender Element Testing