Session Start Date

6-1-1988

Abstract

The work carried out in the 1983-84 period for the building of a sewer line at a shallow depth in the historic center of Arezzo (Tuscany - Italy) caused serious damage to many of the masonry structures. For a depth of 6-7 m., the foundation underground is made of a thick deposit of eterogeneous soils, mainly clayey silt of medium or soft consistency, including elements of gravel, boulders and organic sediment. The tunnel has a circular section, its external diameter being 1.90 m, cover 3.40 - 5.20 m, and the work was carried out using a shield. The method of excavation and the subsequent operation of the tunnel brought about a prolonged disturbance and resettling of the ground in contact with the casing and thus, where fairly large boulders came into contact with the outside edge, gaps formed which were not injected with plastic concrete. On the basis of the geotechnical data available, the surface subsidence has subsequently been calculated and has been compared with what is allowable without damaging the overhead structures.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Second Conference

Publisher

University of Missouri--Rolla

Publication Date

6-1-1988

Document Version

Final Version

Rights

© 1988 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Damage to Masonry Structures in the Historic Center of Arezzo (Tuscany, Italy) Following the Excavation of a Sewer Tunnel

The work carried out in the 1983-84 period for the building of a sewer line at a shallow depth in the historic center of Arezzo (Tuscany - Italy) caused serious damage to many of the masonry structures. For a depth of 6-7 m., the foundation underground is made of a thick deposit of eterogeneous soils, mainly clayey silt of medium or soft consistency, including elements of gravel, boulders and organic sediment. The tunnel has a circular section, its external diameter being 1.90 m, cover 3.40 - 5.20 m, and the work was carried out using a shield. The method of excavation and the subsequent operation of the tunnel brought about a prolonged disturbance and resettling of the ground in contact with the casing and thus, where fairly large boulders came into contact with the outside edge, gaps formed which were not injected with plastic concrete. On the basis of the geotechnical data available, the surface subsidence has subsequently been calculated and has been compared with what is allowable without damaging the overhead structures.