Borehole Logging

The ground log register Metrics, filters, columns and opening a log. Opening the Subsurface Log Studio The Studio layout, the six views, engineering state and reference systems. Managing investigation locations Adding, finding, switching between and deleting locations. Location and drilling details Identity, depth, reduced level, coordinates and drilling details. Logging lithology Recording material intervals, editing them and bulk import. Recording samples Adding samples, SPT blow counts, sample types and import. In-situ and field tests SPT, DCP, CPT, vane shear, UCS and PID records. Groundwater observations Encountered, standing and seepage water levels. Rock core, photos, construction, methods and defects The five specialised data tabs. The log preview and Borehole PDF The engineering log sheet, its columns and generating the PDF. The site plan Plotting positioned locations and verifying the coordinate reference. The Studio GIS map Validating coordinates against a live basemap. The Section designer Building cross-sections, alignment order, exaggeration and draft correlations. The 3D subsurface model Orbiting the model, display controls and what it does not infer. Investigation settings, import and export JSON import and export, per-tab CSV and the engineering state workflow. Describing soils Word order, consistency, density index, moisture and constituent proportions. Describing rock Strength, weathering grades, defect logging, core recovery and RQD. Before drilling Checking the job, confirming scope, setting up the log set, equipment and positions. During drilling Logging as you go, depths, sampling, SPT procedure, groundwater timing and termination. After drilling Backfilling, completing the record, validating positions and handover. Worked example: a fill and clay borehole An annotated end-to-end log through fill into residual clay. Worked example: a cored rock hole Soil to rock transition, rock descriptions, core recovery, RQD and defects. Worked example: a trial pit Logging an exposed face, excavatability, bulk sampling and photography.