When digging a trench, it is vital to learn the kind of soil you are working with so you know the way to properly slope, bench, or shore the trench. This can support avoid a cave-in. : Comparison of shear strength parameter (cu) from laboratory check final results with SPT https://theroyaleband52840.uzblog.net/the-smart-trick-of-soil-investigation-services-bangladesh-that-no-one-is-discussing-45686461