Bearing Capacity Analysis of Raft Foundation Based on Probability Method

Abstract

Variability on CPT test on Anugerah Palace Hotel site has been evaluated in this paper. As CPT data tends to be varied, the deterministic method is not longer appropriate anymore. The probability ana-lysis is conducted to tackle this phenomenon, in the form of Monte Carlo method. This recent me-thod has been developed to calculate raft foundation design on the site at the depth of 4.5 m below soil surface. The analysis starts by fitting tip resistance, qc taken from 4 CPTs data on the Anugerah Palace Hotel site using Normal, Log-normal, Beta, and Gamma distribution by ready program writ-ten in MATLAB. As statistics parameters come out, the analysis of raft foundation can be started to determine the safety factor against the total vertical load of the structures, by computer aid of Crystal Ball. The results show that all sites produce the safety factor larger than 1.0 totally, and there will no chance for failure. As the minimum factor of safety increases up to 2.5, the percentage of the structure for having safety factor laeger than 2.5 are only 5% maximum.