Location

St. Louis, Missouri

Date

08 May 1984, 8:00 am - 10:00 am

Abstract

This paper describes the excavation procedure and some stability problems encountered in connection with a 10-m deep braced excavation in medium soft Oslo clay. Very large deformations in the first excavated sections made it clear that the factor of safety with respect to bottom heave failure was very close to unity, and hence, much lower than the value of 1.5 calculated from a conventional total stress analysis based on vane strength. Thus, the experiences from this excavation yield an excellent opportunity to test new and better methods of stability analysis which have been developed during the last 10 years. Furthermore, recorded values of horizontal displacements and strut loads contribute to improve our knowledge about earth pressures against flexible structures and behaviour of braced deep excavations in clay.

Department(s)

Civil, Architectural and Environmental Engineering

Meeting Name

1st Conference of the International Conference on Case Histories in Geotechnical Engineering

Publisher

Missouri University of Science and Technology

Document Version

Final Version

Rights

© 1984 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Stability Problems in a Deep Excavation in Clay

St. Louis, Missouri

This paper describes the excavation procedure and some stability problems encountered in connection with a 10-m deep braced excavation in medium soft Oslo clay. Very large deformations in the first excavated sections made it clear that the factor of safety with respect to bottom heave failure was very close to unity, and hence, much lower than the value of 1.5 calculated from a conventional total stress analysis based on vane strength. Thus, the experiences from this excavation yield an excellent opportunity to test new and better methods of stability analysis which have been developed during the last 10 years. Furthermore, recorded values of horizontal displacements and strut loads contribute to improve our knowledge about earth pressures against flexible structures and behaviour of braced deep excavations in clay.