Use of drilling rig instrumentation to assess subsurface profile and material characteristics during piling operations

摘要

At the site of a major infrastructure project within South East Queensland, a series of bored piles havernbeen recently installed within a residual and extremely weathered, interbedded sedimentary profile.rnGeotechnical information for the design of the structure was initially gathered by the completion of arnseries of borehole investigations across the site and pile capacities were subsequently confirmed byrncontinual geotechnical supervision of the pile excavations during construction. Supplementaryrngeotechnical information was recorded by the instrumented rotary piling rig mobilised for therninstallation of all piles completed at this site, and this paper presents a retrospective comparisonrnbetween this recorded data and the other geotechnical information received during the various stagesrnof site investigation work. The general characteristics of the recorded drilling parameters are detailed,rnand the interpretation and correlation of the data with the previously modelled subsurface profilesrnpresent at the site is documented. Comparison of the drilling rig data with strata changes, laboratoryrntest results and estimation of material strength has been attempted.