Friction to Unconfined Compression Strength Correlation for Evaluating Capacity of Weak Rock Foundation Sockets

Historically, deep foundations in weak rock have been designed as friction elements using frictional resistance (fs), calculated from the unconfined compressive strength (UCS) of rock. Most published correlations fs to UCS were developed based on load tests low-capacity piles specific geological conditions, values not necessarily representative over test depth. There is a large variation foundation design depths these correlations. This paper presents correlation between and rock, data 44 bidirectional high-capacity rocks. The dataset used this study, one largest for rocks, with high loads range 100–320MN depth mostly 20–87 m below ground level. Bi-directional La Maison tower site then simulated Plaxis, ultimate skin compared against new corelation. actual profile layout modelled Plaxis required derived recommended corelation, check serviceability limits. resulting maximum settlements are found be well within acceptable factor 0.5 thus estimating socket carbonate formations.