Design and Installation of Drilled Shafts in Weathered Rock

The use of drilled shafts for supporting vertical downward loads from building foundation is provided in the case histories presented herein. The paper presents the results of some evaluation and design performed at three sites. A total of three sites are discussed in this paper. The paper includes results of the subsurface investigations, results of the in-situ tests that were conducted during the design phase, and the results of the load tests that were conducted on the drilled shafts prior to the installation of production shafts. The drilled shafts were designed to develop the design capacity through shaft friction and end bearing. In-situ tests were performed at two of the sites that were underlain by a weathered rock stratum. Statnamic tests were performed at two of the sites.