Field Evaluation of the Coupled Shear Strain and Pore Water Pressure Generation Leading To Liquefaction Triggering Using Controlled Dynamic Loading

Abstract eng:
Since the 1980s, the instrumented Wildlife Liquefaction Array (WLA) in Imperial Valley, California, has been the focus of ongoing seismic and soil-liquefaction research. In this paper, the results from five separate soil liquefaction studies are examined and the data are combined to develop a more comprehensive analysis regarding the behavior of liquefiable soils at the WLA site. The experiment data are derived from three types of field tests (CPT, crosshole seismic, and full-scale, in-situ shaking tests) and two types of laboratory tests (resonant column and cyclic triaxial). The work presented herein is part of an effort to confirm and advance in-situ liquefaction testing using large, hydraulically-operated shakers by examining the results of three previous experiments and comparing them with the results from laboratory testing and data-fitted models. The authors believe that the triggering of excess pore pressure generation leading to soil liquefaction is a strain-controlled phenomenon and present results in further support of this theory. Key findings specific to the liquefiable soil at the WLA site include: (1) field identification of the threshold strain for pore pressure generation (γtpp), (2) field data for development of a pore pressure generation model, and (3) development of a modified hyperbolic shear modulus reduction relationship.

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