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Installation of new piles may cause heave which influence friction capacity of existing piles. The heave can be observed from the difference in the elevation of existing pile heads recorded before and after the installation of new piles or through load-settlement diagram from Static Load Test data. This paper presents the study of bearing capacity of hollow cylindrical concrete piles with diameter of 800 mm from two projects. The piles at Project I and Project II were hydraulically jacked into depths of 46 m and 42 m, respectively. The bearing capacity of the piles was determined from the pressing force required to install the instrumented indicator-piles, and Static Load Test performed after the installation of the new piles. The indicator-piles, which were instrumented using Vibrating Wire Strain Gauges to observe the distribution of transferred load along the piles. The pressing force required to install the piles, generally defined as mobilized bearing capacity of piles, was smaller than the bearing capacity of instrumented indicator-piles. The result shows that, the driving of the new piles reduced the bearing capacity of the existing piles to as low as 34% and 39% in Project I and Project II, respectively

Heave induced reduction of friction capacity of pile embedded in clays