Cast-in-place bored piles on soft rock under artesian pressures
Sharma Hari, D.; Sengupta, S.; Harron Glen
Canadian Geotechnical Journal = Revue Canadienne de Geotechnique 21(4): 684-698
This paper outlines the geotechnical investigations that were carried out at a site where cast-in-place bored concrete piles were installed. These piles were designed to bear on top of soft weathered rock surface that was under artesian pressures. It has been found that in areas of high artesian pressures in bedrock axial compressive pile load capacities theoretically estimated by conventional methods were significantly higher than the values obtained from load tests. Representative exposed bedrock samples should be tested to determine their undrained strength, and these values should be used for estimating theoretical pile capacities. Construction problems encountered during pile installation are presented briefly and a solution provided to install belled piles on top of bedrock is discussed.--Modified journal abstract.