Structural Analysis and Design of Slipway Floor with Anchor Jacked Piles

Abstract

The rapid advance of shipbuilding industry generates greater demands on port and waterway engineering. The reconstruction and maintenance of infrastructure supporting shipbuilding industry also has aroused extensive attention. Since the tonnage of ship increases, the bearing capacity of slipway floors can’t meet the working requirement with the moving load of ships. As for the bearing capacity insufficiency, grouting, anchor jacked piles and bored piles are generally used. However, the anchor jacked pile has better practicality and applicability for easier to control construction quality and smaller damage to the original slipway floor. At present, methods based on Winkler foundation model have been more popular in the engineering practice. But Winkler foundation model can’t consider the interaction between pile and soil, the calculated structural internal force of slipway floor is far from the truth. In order to correct Winkler foundation model imperfections in this aspect, this paper provided the method of equivalent bedding value. In terms of area weighted means, the equivalent bedding value of pile and soil in the influence area would be got. Then this weighted area of pile and soil and other areas of soil could be equivalent to springs with different stiffness coefficients for calculating the structural internal force of slipway floor. To some degree, this method reduced the stress concentration on the top of piles and was closely to the reality, remedying some weaknesses of Winkler foundation model. This method may have definite reference value for foundation plate design in engineering application.