Location

Arlington, Virginia

Date

14 Aug 2008, 4:30pm - 6:00pm

Abstract

This paper introduces a slope movement and related railway track movement at Sebastopol, South Wales, UK. The monitoring results including slope movements and groundwater levels are summarised and presented. The slope at Sebastopol has a long history of instability. Because of continued gradual movement of the railway line and accelerated movement in 2004, a series of small diameter ‘Grundomat’ micro-piles were installed alongside the track early in 2005 to increase the shear resistance of the underlying soil and to reduce the rate of slope movement to a small but manageable amount. The slope movements have been continuously monitored since the piles were installed whilst the slope above the railway has continued creeping down-slope. In early 2007, the slope movement was accelerating and the railway itself was again involved in movements of about 20 mm per week. Given the increased movement of the bank it was considered likely that the Grundomat piles were either rotating or failing in bending. To gain further temporary stability, additional Grundomat piles were installed. Back-analyses of slope stability with and without the piles were carried out.

Department(s)

Civil, Architectural and Environmental Engineering

Meeting Name

6th Conference of the International Conference on Case Histories in Geotechnical Engineering

Publisher

Missouri University of Science and Technology

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Aug 11th, 12:00 AM Aug 16th, 12:00 AM

Evaluation and Stabilisation of an Embankment at Sebastopol, South Wales, UK

Arlington, Virginia

This paper introduces a slope movement and related railway track movement at Sebastopol, South Wales, UK. The monitoring results including slope movements and groundwater levels are summarised and presented. The slope at Sebastopol has a long history of instability. Because of continued gradual movement of the railway line and accelerated movement in 2004, a series of small diameter ‘Grundomat’ micro-piles were installed alongside the track early in 2005 to increase the shear resistance of the underlying soil and to reduce the rate of slope movement to a small but manageable amount. The slope movements have been continuously monitored since the piles were installed whilst the slope above the railway has continued creeping down-slope. In early 2007, the slope movement was accelerating and the railway itself was again involved in movements of about 20 mm per week. Given the increased movement of the bank it was considered likely that the Grundomat piles were either rotating or failing in bending. To gain further temporary stability, additional Grundomat piles were installed. Back-analyses of slope stability with and without the piles were carried out.