The importance of ground investigation findings in the design for overhead line electrification foundations

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

Major part of the investment in UK rail infrastructure has been spent on electrification of the existing network with Overhead Line Electrification (OLE) requiring significant investment to provide the long term benefits. The pressure reduce the cost of electrification works has brought cuts in the ground investigation budgets resulting in a significant drop to one borehole investigation for every 500 m length of rail track and general lack of ground information available for most of the proposed overhead line mast foundations for OLE projects. The current piled foundation design in the UK railway industry is based on experiment and research-developed system (Overhead Line Equipment Master Index - OLEMI), whereby the foundation length is derived for worst-case ground conditions leading to overdesign of foundation size for safety and stability. Ground investigations are only carried out when the ground is very poor or when the foundation designed to the method known as fails. The research method for this paper is based on gathering historical geological data from the British Geological Society, designing pile foundation using conventional design codes and comparing the foundation depth against OLEMI-designed foundations for a case study from the Scottish Central Belt. The results showed that conventional foundation design can provide about 50% savings on overall foundations depth. Detailed analysis showed that some OLEMI-designed foundations did not have enough lateral resistance and anchors had to be added. Moreover, about 99.5% of the OLE foundations were shown to be overdesigned due to the fact that they were installed on firmer soil conditions and shorter foundation would have been sufficient to act against the disturbing acting moment. Therefore, a balanced approach of using geological information from historical sources and allocating additional intrusive and non-intrusive ground investigation was shown to be beneficial for reducing construction costs on overhead line projects.
Original languageEnglish
Title of host publicationRoad and Rail Infrastructure IV
Subtitle of host publicationCETRA 2018, Proceedings 5th International Conference on Road and Rail Infrastructure
EditorsStjepan Lakusic
PublisherUniversity of Zagreb
Publication statusPublished - 17 May 2018

Publication series

Name
ISSN (Print)1848-9850

Fingerprint

Overhead lines
Rails
Pile foundations
Railroad tracks
Boreholes
Anchors
Costs

Keywords

  • OLEMI
  • ground investigations
  • piled foundations
  • bearing capacity

Cite this

Mickovski, S. B. (2018). The importance of ground investigation findings in the design for overhead line electrification foundations. In S. Lakusic (Ed.), Road and Rail Infrastructure IV: CETRA 2018, Proceedings 5th International Conference on Road and Rail Infrastructure University of Zagreb.
Mickovski, Slobodan B. / The importance of ground investigation findings in the design for overhead line electrification foundations. Road and Rail Infrastructure IV: CETRA 2018, Proceedings 5th International Conference on Road and Rail Infrastructure. editor / Stjepan Lakusic. University of Zagreb, 2018.
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title = "The importance of ground investigation findings in the design for overhead line electrification foundations",
abstract = "Major part of the investment in UK rail infrastructure has been spent on electrification of the existing network with Overhead Line Electrification (OLE) requiring significant investment to provide the long term benefits. The pressure reduce the cost of electrification works has brought cuts in the ground investigation budgets resulting in a significant drop to one borehole investigation for every 500 m length of rail track and general lack of ground information available for most of the proposed overhead line mast foundations for OLE projects. The current piled foundation design in the UK railway industry is based on experiment and research-developed system (Overhead Line Equipment Master Index - OLEMI), whereby the foundation length is derived for worst-case ground conditions leading to overdesign of foundation size for safety and stability. Ground investigations are only carried out when the ground is very poor or when the foundation designed to the method known as fails. The research method for this paper is based on gathering historical geological data from the British Geological Society, designing pile foundation using conventional design codes and comparing the foundation depth against OLEMI-designed foundations for a case study from the Scottish Central Belt. The results showed that conventional foundation design can provide about 50{\%} savings on overall foundations depth. Detailed analysis showed that some OLEMI-designed foundations did not have enough lateral resistance and anchors had to be added. Moreover, about 99.5{\%} of the OLE foundations were shown to be overdesigned due to the fact that they were installed on firmer soil conditions and shorter foundation would have been sufficient to act against the disturbing acting moment. Therefore, a balanced approach of using geological information from historical sources and allocating additional intrusive and non-intrusive ground investigation was shown to be beneficial for reducing construction costs on overhead line projects.",
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Mickovski, SB 2018, The importance of ground investigation findings in the design for overhead line electrification foundations. in S Lakusic (ed.), Road and Rail Infrastructure IV: CETRA 2018, Proceedings 5th International Conference on Road and Rail Infrastructure. University of Zagreb.

The importance of ground investigation findings in the design for overhead line electrification foundations. / Mickovski, Slobodan B.

Road and Rail Infrastructure IV: CETRA 2018, Proceedings 5th International Conference on Road and Rail Infrastructure. ed. / Stjepan Lakusic. University of Zagreb, 2018.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - The importance of ground investigation findings in the design for overhead line electrification foundations

AU - Mickovski, Slobodan B.

N1 - Acceptance letter attached to PURE record by author. Found evidence of publication via Google books - added ISSN etc. Query to author re publication date [update - author confirmed by email 2-5-19]. Also check if can make file open. Looks like in scope has ISSN. ET 2/5/19 ^Found publisher info on the website where: authors retain copyright and the manuscript is made available under a CC-BY licence: https://master.grad.hr/cetra/ocs/index.php/cetra5/index/pages/view/publishing

PY - 2018/5/17

Y1 - 2018/5/17

N2 - Major part of the investment in UK rail infrastructure has been spent on electrification of the existing network with Overhead Line Electrification (OLE) requiring significant investment to provide the long term benefits. The pressure reduce the cost of electrification works has brought cuts in the ground investigation budgets resulting in a significant drop to one borehole investigation for every 500 m length of rail track and general lack of ground information available for most of the proposed overhead line mast foundations for OLE projects. The current piled foundation design in the UK railway industry is based on experiment and research-developed system (Overhead Line Equipment Master Index - OLEMI), whereby the foundation length is derived for worst-case ground conditions leading to overdesign of foundation size for safety and stability. Ground investigations are only carried out when the ground is very poor or when the foundation designed to the method known as fails. The research method for this paper is based on gathering historical geological data from the British Geological Society, designing pile foundation using conventional design codes and comparing the foundation depth against OLEMI-designed foundations for a case study from the Scottish Central Belt. The results showed that conventional foundation design can provide about 50% savings on overall foundations depth. Detailed analysis showed that some OLEMI-designed foundations did not have enough lateral resistance and anchors had to be added. Moreover, about 99.5% of the OLE foundations were shown to be overdesigned due to the fact that they were installed on firmer soil conditions and shorter foundation would have been sufficient to act against the disturbing acting moment. Therefore, a balanced approach of using geological information from historical sources and allocating additional intrusive and non-intrusive ground investigation was shown to be beneficial for reducing construction costs on overhead line projects.

AB - Major part of the investment in UK rail infrastructure has been spent on electrification of the existing network with Overhead Line Electrification (OLE) requiring significant investment to provide the long term benefits. The pressure reduce the cost of electrification works has brought cuts in the ground investigation budgets resulting in a significant drop to one borehole investigation for every 500 m length of rail track and general lack of ground information available for most of the proposed overhead line mast foundations for OLE projects. The current piled foundation design in the UK railway industry is based on experiment and research-developed system (Overhead Line Equipment Master Index - OLEMI), whereby the foundation length is derived for worst-case ground conditions leading to overdesign of foundation size for safety and stability. Ground investigations are only carried out when the ground is very poor or when the foundation designed to the method known as fails. The research method for this paper is based on gathering historical geological data from the British Geological Society, designing pile foundation using conventional design codes and comparing the foundation depth against OLEMI-designed foundations for a case study from the Scottish Central Belt. The results showed that conventional foundation design can provide about 50% savings on overall foundations depth. Detailed analysis showed that some OLEMI-designed foundations did not have enough lateral resistance and anchors had to be added. Moreover, about 99.5% of the OLE foundations were shown to be overdesigned due to the fact that they were installed on firmer soil conditions and shorter foundation would have been sufficient to act against the disturbing acting moment. Therefore, a balanced approach of using geological information from historical sources and allocating additional intrusive and non-intrusive ground investigation was shown to be beneficial for reducing construction costs on overhead line projects.

KW - OLEMI

KW - ground investigations

KW - piled foundations

KW - bearing capacity

M3 - Conference contribution

BT - Road and Rail Infrastructure IV

A2 - Lakusic, Stjepan

PB - University of Zagreb

ER -

Mickovski SB. The importance of ground investigation findings in the design for overhead line electrification foundations. In Lakusic S, editor, Road and Rail Infrastructure IV: CETRA 2018, Proceedings 5th International Conference on Road and Rail Infrastructure. University of Zagreb. 2018