Profiling of K0 lateral stress coefficient in soils using paired directional G0 ratios

Using a special database compiled from directional shear wave velocity measurements at 12 well-documented sites, the geostatic stress state and stress history are evaluated from shear stiffness ratios. At each site, a benchmark profile of lateral stress coefficient (K0) was detailed using direct in-situ methods (i.e., self-boring pressuremeter, total stress cells, and/or hydraulic fracture), and/or laboratory methods (i.e., suction, consolidometer, and/or triaxial stress path testing). Also, the yield stress ratio (YSR), or more common parameter: overconsolidation ratio (OCR), was available either from series of consolidation tests on undisturbed samples procured from various depths and/or engineering geology studies, or both. Statistical expressions are derived to relate both K0 and OCR in terms of the ratio G0,HH/G0,VH as well as other factors.