The development law of pore water pressure in the roads of the hydraulic fill area under traffic vibratory load was analyzed by dynamic triaxial test in this paper. The test results show that pore water pressure of hydraulic fill subgrade under traffic vibratory load increases with vibration times. At the beginning of vibration, the pore water pressure increases quite quickly. The development law of pore water pressure of hydraulic fill subgrade differs in lower and higher frequency traffic vibratory load. The development law of pore water pressure under lower and higher frequency traffic vibratory load can be described by Eq. 1 and Eq. 2, respectively. When the pore water pressure reaches ninety percent of effective value of confining pressure, the deformation failure of hydraulic fill under higher frequency traffic vibratory load occurs.
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