Geotechnical Engineering in Dallas, TX

North Texas geotechnical practice is defined by the Blackland Prairie: smectite-rich clays with some of the highest shrink-swell potential mapped in the country, over marls and chalks of the Eagle Ford and Austin formations that appear at depths that vary block to block. Foundation design here is a PVR conversation first, how much can this profile move, and what tolerates it: stiffened slabs, post-tensioned slabs, or piers drilled to the underlying chalk. Our investigations characterize the clay honestly, establish the depth to competent bearing, run the swell and index testing the numbers depend on, and verify subgrades during construction, because a Dallas pad built wetter or drier than designed will announce itself within two seasons.

Depth to Austin Chalk is the pivotal variable across much of Dallas: shallow chalk makes drilled piers economical and reliable, deep chalk pushes design toward slabs engineered to ride the clay, and the boring program is what establishes which site you have.

• Soil borings and sampling programs sized to the structure and site
• Laboratory index testing: Atterberg limits (ASTM D4318), moisture content (ASTM D2216)
• Moisture-density relationships and bearing evaluation for foundations and pavements
• Expansive-soil characterization for slab and pavement design
• Construction-phase verification: proof rolls, subgrade acceptance, fill placement observation

ASTM D4318ASTM D2216ASTM D698ASTM D1557