Lateral Resistance of Short Rock Sockets in Weak Rock:a Case History

摘要

The results from full-scale cyclic and repeated lateral load testing of two short rock sockets inweak rock and the recommendations developed for p-y analysis using those results are presented.Two drilled shafts were constructed in rock sockets 42 inches in diameter to depths ofapproximately seven feet in limestone in Wyandotte County, Kansas. The shafts were loadedlaterally during three separate test events. The shafts were tested under cyclic loading (loadreversal) for loads up to 400 kips, repeated loading in one direction up to 820 kips, and to failurenear 1,000 kips.Test data showed that socket behavior was essentially elastic during cyclic loading forloads of 400 kips (40% of nominal resistance) and lower. The shafts experienced permanent,accumulating deformations during repeated loading to 610 and 820 kips.Modeling of the results showed the lateral load behavior could be effectively modeled inLPILE using the Reese “weak rock” model included with LPILE software. Recommendationsfor use in modeling are presented.