SIMULATION COMPUTATION OF COMPACTION EFFECT FOR OPEN-ENDED PIPE PILE BASED ON PLUGGING EFFECT

The compaction effect for open-ended pipe pile is different to that for closed-ended pile due to the plugging effect． There are notable engineering significance and academic value in its simulation computation． A train of spherical cavities were adopted to simulate the pile installation process，and the quantity of spherical cavities would be obtained based on the principle of equivalent volume． The displacement and stress fields arised from spherical cavity expansion in semi-infinite by using source-source and source-image methods． Meanwhile，the influences of friction fatigue effect and soil plugging effect were included in the simulation computation． It is proved that this method is feasible through comparing the calculations with the field test results.