What’s below the surface decides what you can safely build above it. These guides cover foundation types and bearing capacity, retaining wall design and the coefficient of friction behind it, slope stability and the main geotechnical hazards on a site, dewatering techniques, and reading RMR/RQD rock-mass parameters and geotechnical reports. A second thread covers turning that same field data — borehole logs, lab results, site investigation reports — into structured data and 3D ground models with AI, instead of digitising it by hand from a stack of PDFs. Useful whether you’re specifying the investigation or reviewing what came back from it.