A 14-story tower on Post Oak Boulevard required foundation design input for stiff Beaumont clay. The geotechnical team specified direct shear testing to determine the drained shear strength parameters. Houston's expansive clay and interbedded sand layers demand precise soil characterization. Direct shear test results provide cohesion and friction angle data critical for shallow foundation and retaining wall design. Before placing concrete, engineers often combine this test with [geotechnical site characterization](/) to verify subsurface conditions match the boring logs. The test is quick and cost-effective for routine projects across the city.
The direct shear test provides the cohesion and friction angle essential for foundation design in Houston's variable clay and sand stratigraphy.