PROBABILISTIC ANALYSIS OF FOUNDATION ON JOINTED ROCKS

Abstract

Safety of dams can be assessed based on the risk analysis methodologies that considered for evaluation of the risks associated to the dam-reservoir system. For this purpose it is important to estimate the probability of load events and probability of failure for different drainage conditions. For this purpose various numbers of field data of rock parameters i.e. OS!, RMR, UCS etc have been used. In this theses probability of failure have been calculated due to downstream stresses at toe of the dam under different water level condition. Hoek and Brown (1980) and Singh and Singh (2012) criterion have been used to calculate the bearing capacity at toe of the dam by applying bell's approach. Further comparison of factor of safety have been done under different water level condition at upstream side of the concrete gravity dam by using Hoek and Brown (1980) and Singh and Singh (2012) criterion. Moreover Reliability index and probability of failure have been also calculated for different water level condition and comparison of Probability of failure, Reliability index under effective-ineffective drains have been also done for both criterions