Pile Load Test

A pile load test applies a controlled axial (or lateral/pull-out) load to a pile and measures the resulting settlement to verify its safe load-carrying capacity in the actual ground. IS 2911 Part 4 governs the procedure. Two types are used: the Initial (preliminary) test, taken to 2.5× the design (working) load on a sacrificial test pile to establish capacity + settlement behaviour and validate the design; and the Routine test, taken to 1.5× the working load on selected working piles for quality assurance (typically 0.5-2% of piles, minimum one per project).

Load is applied in increments via a hydraulic jack reacting against a kentledge stack or anchor/tension piles, each increment held until the settlement rate falls below the IS 2911 criterion, with dial gauges/LVDTs recording settlement. Safe load is the least of: capacity at a defined gross/net settlement (e.g. 12 mm net or 10% of pile diameter for the ultimate), two-thirds of the load at 12 mm gross, or as specified. Non-destructive integrity tests (low-strain PIT, cross-hole sonic logging) complement but do not replace the load test.