Lateral load test of a drilled shaft in clay

The behavior of a laterally drilled shaft in clay has been investigated by conducting a lateral load test on an instrumented shaft. Lateral deflection, shaft rotation, and soil resistance were measured for each applied load. Dial gages were used toot measure lateral deflection, while the shaft rotation was determined by means of an inclinometer. Pneumatic pressure cells were installed in the shaft at various depths to measure the soil resistance. The applied lateral load was measured with a strain gage load cell. Structural failure of the shaft occurred before the soil failed and prevented the attainment of the ultimate lateral soil resistance. However, it was possilbe to compare the ultimate soil reactions predicted by several analytical procedures with the soil reaction calcualted form the maxium recorded soil resistance. Also, an ultimate lateral load for the test shaft was predicted by various analytical methods. A comparison was made between the maximum recorded load and the various predicted ultimates. Finally, a comparison was made between two ultimate test loads obtained form the technical literature and the ultimate loads predicted by the analytical methods. A tentative procedure for the design of the rigid, laterally loaded drilled shafts is presented. However, additional load tests are needed before the design can be finalized. /FHWA/

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