ABSTRACT

Embankment piles, the piling method in soft ground under embankments or backfills, can effectively prevent the lateral flow of soft ground by decreasing overburden due to embankments or backfills on soft ground. Theoretical analyses are performed to predict the vertical loads on embankment piles with cap beam and isolated cap, respectively. Failure mechanism such as soil arching failure is investigated according to the failure pattern in embankment on soft ground supported by piles with cap beams. In the investigation of the soil arching failure, the stability in the crown of the arch is compared with the stability above the isolated caps. The factors affecting the load transfer in the embankment fill by soil arching are the space between piles, the width of cap and the soil parameters of the embankment fill. Thus, in order to maximize the effect of embankment load transfer by piles, the factors affecting load transfer in embankment should be appropriately designed.

INTRODUCTION

In recent, embankments on soft ground have been frequently performed for the construction of airport, harbor and highway in Korea. When backfills are placed on soft ground after construction of such structures as bridge abutments, retaining walls, etc., soft grounds are subjected to unsymmetrical surcharge, which induces lateral flow or sliding failure in soft ground.

The piling method in soft ground under embankments or backfills, can effectively prevent the lateral flow of soft ground by decreasing overburden due to embankments or backfills on soft ground. Usually the embankment piles have two effects on the treatment of soft ground. That is, they stiffen the soft subsoil and reduce stresses on the upper subsoil by transferring load to lower elevations.

Recent examples of embankment piles construction were given by Brandl et al.(1997), Rogbeck et al.(1998) and Jenner et al.(1998).

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