In order to investigate dynamic compaction process in concrete, pore pressure during vibratory compaction is analyzed by the boundary element method (BEM), applying Biot's two-phase theory. In a compactibility test of fresh concrete, variations of pore pressure and mechanical properties are measured. Then, distributions of pore pressures are estimated analytically and compared with experimental results. Good agreement is confirmed, and the distributions of pore pressures during the compactibility test are clarified. Compaction process by means of an internal vibrator is investigated, applying BEM analysis. Thus, it is confirmed that spatial distribution of pore pressure under vibration is closely associated with slump values of fresh concrete.
