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Behaviour of discrete piles used to stabilise a tree-covered railway embankment

Behaviour of discrete piles used to stabilise a tree-covered railway embankment
Behaviour of discrete piles used to stabilise a tree-covered railway embankment
Many clay railway embankments in the UK are well over 100 years old, and now suffer from a range of stability and serviceability problems. A common means of remediating earthworks that have either suffered, or are assessed as being at risk of, deep-seated slope failure is to install a row of discrete piles along the mid-slope. This paper presents field data from a 9 m high, pile-stabilised embankment at Mill Hill, north London. Initial pore water pressure measurements had shown that the trees present on the earthwork maintained low pore water pressures during winter; thus the trees were left in place after piling to aid stability. The piles initially bent upslope, as a result of inward shrinkage of the embankment over a period of dry weather, before then being loaded by shallower downslope movements of the clay. Later cycles of seasonal movement caused a small but gradual ratcheting upward of pile bending moments. The largest bending moments measured over six years of monitoring were those resulting from the initial inward shrinkage of embankment, which reached about 25% of the design capacity of the piles. At the end of the monitoring period, the measured bending moments resulting from shallower downslope ground movements were about 20% of the pile design capacity.
embankments, monitoring, slopes
0016-8505
774-790
Smethurst, Joel
8f30880b-af07-4cc5-a0fe-a73f3dc30ab5
Bicocchi, Nicola
a6b8f52b-c98c-4809-a787-7076df4adf83
Powrie, William
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
O'Brien, A.S.
d88d5bd9-31ba-41e4-86f5-c4a6e2536f39
Smethurst, Joel
8f30880b-af07-4cc5-a0fe-a73f3dc30ab5
Bicocchi, Nicola
a6b8f52b-c98c-4809-a787-7076df4adf83
Powrie, William
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
O'Brien, A.S.
d88d5bd9-31ba-41e4-86f5-c4a6e2536f39

Smethurst, Joel, Bicocchi, Nicola, Powrie, William and O'Brien, A.S. (2020) Behaviour of discrete piles used to stabilise a tree-covered railway embankment. Géotechnique, 70 (9), 774-790, [18-P-150R1]. (doi:10.1680/jgeot.18.P.150).

Record type: Article

Abstract

Many clay railway embankments in the UK are well over 100 years old, and now suffer from a range of stability and serviceability problems. A common means of remediating earthworks that have either suffered, or are assessed as being at risk of, deep-seated slope failure is to install a row of discrete piles along the mid-slope. This paper presents field data from a 9 m high, pile-stabilised embankment at Mill Hill, north London. Initial pore water pressure measurements had shown that the trees present on the earthwork maintained low pore water pressures during winter; thus the trees were left in place after piling to aid stability. The piles initially bent upslope, as a result of inward shrinkage of the embankment over a period of dry weather, before then being loaded by shallower downslope movements of the clay. Later cycles of seasonal movement caused a small but gradual ratcheting upward of pile bending moments. The largest bending moments measured over six years of monitoring were those resulting from the initial inward shrinkage of embankment, which reached about 25% of the design capacity of the piles. At the end of the monitoring period, the measured bending moments resulting from shallower downslope ground movements were about 20% of the pile design capacity.

Text
Smethurst et al FINAL ACCEPTED 02 may 19 - Accepted Manuscript
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More information

Accepted/In Press date: 2 May 2019
e-pub ahead of print date: 17 August 2019
Published date: September 2020
Keywords: embankments, monitoring, slopes

Identifiers

Local EPrints ID: 430731
URI: http://eprints.soton.ac.uk/id/eprint/430731
ISSN: 0016-8505
PURE UUID: 4be04fd6-c407-4826-853b-8ef3577ccb3c
ORCID for William Powrie: ORCID iD orcid.org/0000-0002-2271-0826

Catalogue record

Date deposited: 09 May 2019 16:30
Last modified: 18 Feb 2021 16:43

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