ABSTRACT:

The paper deals with an examination of the geotechnical aspects of a plan to renovate the "Parco delle Rimembranze", next to the Teodorico Mausoleum in Ravenna, Italy. A wide, open square is to be built at the ground level of the Mausoleum, situated at about 1.75 m below the water level of the adjacent Candiano canal. The ground on which the square is to be built, consists of medium fine sea sand (coastal and beach deposits), below the water table and subjected to an upward hydraulic flow. Problems involved in the project include controlling the level of the water both at the provisional and at the final stage. In order to decide on the best engineering solution, accurate investigations were conducted on site, including pumping tests to evaluate how to keep the water table down and besides permeability coefficients.

INTRODUCTION

The project for renovating the "Parco delle Rimembranze" next to the Teodorico Mausoleum in Ravenna includes the construction of a wide, open square with the ground level at about 1.75 m below the level of the water table which is fixed by the water level of the adjacent "Candiano" harbour canal, controlled in turn by the level of the sea. The excavation work required to build the square involves complex hydraulic rising problems; these problems may be due to piping, or to the fact that the excavation floor may be pushed up by unbalanced underthrusts on impermeable soil lenses (silt and clays) inside the incoherent sandy deposit. The plan envisages linking the square on one side to the upper surrounding area by means of grassy slopes of variable gradients, while on the other side the square will be lower than the adjacent embankments and the difference in height is guaranteed by stiff retaining walls.

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