Abstract: Through the large-scale shaking table test, the distribution of peak pressure near the sliding surface was analyzed. The seismic signal has the characteristics of short duration and non-stationarity. Based on the characteristics, the horizontal-loaded El waves were decomposed to analyze the dynamic response in different frequency bands by using wavelet packet analysis, which has the properties of uniform frequency band division and time-frequency localization. The test results show that the dynamic soil pressure is usually highest at the position near the sliding surface. Moreover, the dynamic soil pressure is abrupt at the heights of 25 cm and 45 cm along the pile body, respectively, which should be paid attention to in practical engineering. The frequency bands those greatly affect the dynamic pressure of micro-piles are the first frequency band (0.1-6.26 Hz) and the second frequency band (6.26- 12.51 Hz). In the engineering application, the resonance between the seismic waves in these two frequency bands and the micro-piles should be avoided. At 25 cm of pile height, the dynamic soil pressure values on the hill and river sides of micro-piles at the rear row are higher than those of micro-piles in the front row, while at 45 cm of pile height, the dynamic soil pressure values on the hill and river sides of micro-piles in the front row are higher than those of micro-piles at the rear row.

Key words: soil slope, large shaking table test, wavelet packet, peak pressure, dynamic pressure spectrum characteristics