EXPERIMENTAL STUDY OF DYNAMIC CHARACTERISTICS OF SAND WITH FINE GRAINS UNDER WAVE LOAD

The dynamic characteristics of saturated sand with fine grains were studied by hollow cylinder apparatus torsional shear test. The test results showed that the liquefaction cycles for sands under wave load by hollow cylinder torsional shear test were obviously smaller than that one by dynamic triaxial or dynamic torsional shear test; with the increase of fine grained content, the liquefaction cycles for sand with fine grained content first decreased and then increased, when the content of fine grains was about at 10%, the cycles were lowest; when the fine grained content was smaller, the development rule of excess pore water pressure of sand with fine graines was similar to that of pure sand, when the fine grained content reached more than 15%, the rule of clay gradually appeared. The results showed that the content of fine grains and the effective confining pressure had no effect on the modulus normalization curve; the damping ratio normalization curve of sand mixed with fine particles was obviously affected by the confining pressure, and the larger the initial effective confining pressure, the smaller the damping ratio.