The Shelby tube sampler goes down, and you hear that distinct suction break when the piston retracts. That is the sound of a high-quality undisturbed sample being recovered from the Jackson Formation silts that underlie most of downtown Memphis. Our field crews work the Mid-South all year, and around here, the stratigraphy can shift from Pleistocene loess to Eocene clay within 15 vertical feet on the same site. A proper soil mechanics study is not just about running a set of index tests; it is about reconstructing the depositional story so the numbers make sense. We schedule drilling rigs to pull Shelby tubes and split-spoon samples, then run the full characterization in our accredited laboratory, following ASTM D1586 for field penetration and ASTM D2487 for classification. For projects near the Wolf River floodplain, we often combine the field campaign with a CPT test to capture continuous tip resistance and pore pressure dissipation, which feeds directly into the consolidation and shear strength program.
Loess collapse in eastern Memphis can produce differential settlements exceeding 4 inches under a 2,000 psf footing load if saturation occurs after construction.
