SEDL / STP / STP835-EB / STP36820S

Lateral-Load Test of an Aged Drilled Shaft

Johnson, LD
Research civil engineer, U.S. Army Engineer Waterways Experiment Station, Vicksburg, Miss.

Briaud, J-L
Associate professor, Texas A&M University, College Station, Tex.

Stroman, WR
Project engineer, U.S. Army Engineer District, Fort Worth, Tex.

Pages: 10    Published: Jan 1984

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Abstract

A lateral-load test was conducted on a 0.46-m-diameter concrete drilled shaft constructed July 1966 in stiff expensive-clay soil. This 10.5-m-long test shaft had been subject to considerable uplift thrust from swelling of adjacent soil. The lateral-load behavior was reasonably simulated by solutions of the elastic beam-column differential equation. Solutions assuming a linearly increasing soil modulus with depth evaluated from triaxial strength tests were found in good agreement with the field load test results up to at least ½ of the yield load. Solutions using p-y curves developed from laboratory undrained strengths, and field pressuremeter tests provided good overall agreement with the field load test results.