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Abstract The ground motion in earthquake is a complex and multi-dimensional movement. The ground soil experiences the horizontal shearing in two directions with the shear directions and the magnitudes of the loading both coupling. The effect of cyclic shear direction and shear strain amplitude ? on the shear modulus G and the pore pressure u were therefore investigated to the saturated soft clay during the shear process and compression in the reconsolidation process with the VDDCSS system. The shear modulus G was found to be different in different directions due to the soil anisotropy. The shear test with small ? made G increased slightly in other directions. The changing of shear direction accelerated the declining of G(1.51 times of unidirectional attenuation of G) and promoted the development of u in the shear process(1.67 times of the increment of the unidirectional pore pressure u). The shear tests with ? greater than a value ?s had no such phenomenon. The changing of shear direction influenced greatly the amplitude of pore pressure uamp. When 0.1%＜?＜2.0%，the reconsolidation settlement ?Hrc/H increased with the increasing of ?. The changing of shear direction promoted the ?Hrc/H at the small ? and reached a value which was reached at the large ? in uni-directional shear；when ?≥2.0%，the ?Hrc/H under 2 kinds of shear-mode tended to be the same.
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2015, Vol. 34 
