A comprehensive testing database composed of modeling-quality, multi-directional cyclic simple shear testing on medium to high relative density, fully-saturated samples of Monterey 0/30 sand has recently been developed. This testing incorporated a variety of never before examined multi-directional stress paths on both level and sloping ground. Results from these tests have proven useful for enhancing current understanding of liquefaction behavior by allowing for a more complete theory to emerge. This new three-dimensional theory greatly expands current understanding of liquefaction behavior and elucidates some areas in which current theory—which has been based principally on uni-directional testing—can be misleading or unconservative. Of particular interest are the topics of (a) pore pressure generation as a function of loading magnitude and direction, (b) the effects of sloping ground conditions, (c) the post-liquefaction pore pressure behavior within each cycle, and (d) strain accumulation. Also described is the impact of multidirectional loading on maximum achievable pore pressures.
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