Abstract: Two static axial compressive loading tests on bored reinforced concrete piles that socketed into soft rock to obtain the vertical resistance characteristics of these bored pies. The shaft load transfer was measured by the instrumented fiber optic lines. Combined with the numerical analysis, the axial stress, shaft and tip resistances could be separated. The axial compressive static load test results on bored piles indicate that the shaft resistance increases with the depth to the pile tip; further, at the location of soil stratigraphy change, the obvious shaft resistance changes could be observed. The shaft resistance also increases with the increase of applied axial load. The increased shaft resistance are one meter above the tip of bored pile.

Key words: soft rock, bored piles, skin friction, tip resistance, axial capacity