Abstract:
This paper explores the response of water-level on the vibrations under hydrostatic condition by carrying on the experiments that put self-designed well-confined aquifer seepage system on the earthquake simulation shaking table. The experiment includes 12 groups of sine vibrations whose frequencies
fin in turns are 0.5, 1, 2, 5, 10, 15 Hz and accelerations
ain are 1.5, 2.5 m/s
2, respectively. The results indicate: piezometric level presents four kinds of response patterns, that is, ascending, ascending-oscillating, oscillating and descending-oscillating, which are similar with water level variation patterns resulted from earthquakes; among the twelve groups of vibrations, the water level in observation well and pore water pressure were likely to decrease at low frequency (
fin=1, 2 Hz), and increase at mid-high frequency (
fin=5, 10 Hz), oscillate at high frequency (
fin=15 Hz), and the acceleration peak also affects their variation patterns; their variation amplitudes increase first, and then decrease with the increase of input frequency. The maximum amplitude variation respectively appears at the two vibration conditions of
ain=1.5 m/s
2,
fin=10 Hz and
ain=2.5 m/s
2,
fin=5 Hz.