METHOD FOR THE CALCULATION OF THE STABILITY OF PILES IN THE COURSE OF HAMMERING INTO MULTI-LAYER SOIL FOUNDATION

Supposing the hammering load action on the top of piles is periodical, the hammering process is simplified as a parameter stimulating vibration problem. Thus it can be concluded as solving the steadiness limits of Mathieu Equation. For multi-layer hard clay, sand, soft clay and mixture of sand and clay, the critical steadiness length of pile is calculated. A group of apparent expression equations for the steadiness calculation is also presented.