Session Start Date

5-6-1984

Abstract

Loading tests on 865 mm diameter plates showed that the fractured chalk was much more compressible than at other sites on the same deposit but it was still considered that slab foundations would be adequate for the bridges at most locations. Detailed measurements have been made on one of the bridge abutment foundations both during and following construction. Measurements were made of vertical pressures applied to the ground, lateral earth pressures acting on the abutment wall, settlements of the foundation slab, tilt of the wall, and vertical displacements in the ground below the foundations. These observations confirmed the adequacy of slab type foundations for simple single span highway bridges founded on highly fractured chalk. Values of deformation moduli back analysed from the measurements on the bridge foundation were in reasonable agreement with the values obtained from loading tests on 865 mm diameter plates at the bridge site and the low values obtained at another local site. The values back analysed from the bridge measurements were however much lower than those determined from a large tank loading test and 865 mm diameter plate tests on the same grade of chalk in another part of the deposit.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

First Conference

Publisher

University of Missouri--Rolla

Publication Date

5-6-1984

Document Version

Final Version

Rights

© 1984 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 6th, 12:00 AM

Behaviour of Bridge Abutment on Fractured Chalk

Loading tests on 865 mm diameter plates showed that the fractured chalk was much more compressible than at other sites on the same deposit but it was still considered that slab foundations would be adequate for the bridges at most locations. Detailed measurements have been made on one of the bridge abutment foundations both during and following construction. Measurements were made of vertical pressures applied to the ground, lateral earth pressures acting on the abutment wall, settlements of the foundation slab, tilt of the wall, and vertical displacements in the ground below the foundations. These observations confirmed the adequacy of slab type foundations for simple single span highway bridges founded on highly fractured chalk. Values of deformation moduli back analysed from the measurements on the bridge foundation were in reasonable agreement with the values obtained from loading tests on 865 mm diameter plates at the bridge site and the low values obtained at another local site. The values back analysed from the bridge measurements were however much lower than those determined from a large tank loading test and 865 mm diameter plate tests on the same grade of chalk in another part of the deposit.