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Drilled foundations often are socketed into rock to increase the foundation capacity. However, procedures to quantify the side resistance capacity of sockets vary considerably. This paper reviews many of the proposed methods to predict this capacity and critically assesses them. One method then is recommended, based on the currently available data. Statistics for this method are presented, and design implications are noted.

1. INTRODUCTION

Drilled shafts are a common foundation selection for all types of structures. When the structure loads are relatively large or where the soil is of relatively poor quality, the shafts often are drilled through the soil to the underlying rock mass. These shafts then could be founded or seated on the surface of the rock mass, or they could be drilled into the rock mass to create a rock socket, as shown in Figure 1. In this figure, the load or stress …