The purpose of this paper is to presents the results of a numerical study on the effects of a diaphargm wall embedded between a shallow tunnel and a structure exposed to potential damage.
Numerical Analyses were carried out by the code PLAXIS©: the tunnel was modelled as an unlined 8m diameter cicular cavity with a cover varyingin the range C/D = 1 ÷ 2. A diaphragm wall close to the tunnel was also modelled, by using beam elements. Its geometry was changed: the main geometrical factors (wall length and thickness), the rougness of the inteface between the soil and the wall, the wall self weight and its offset from the tunnel axis were combined in a number of cases and the seults in terms of horizontal and vertical displacements at suface and in depth were investigated. A different ability of modifying in a facourable way the greenfield displacement field was observed, depending on the combination of factors, and a different sensibility to the variation of each factor was highlighted.
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