installation of underground pipelines: effects on soil properties

Since the 1970s a network of underground pipes, up to 1200 mm diameter, has been installed in the UK to transmit crude oil to refineries and gas from onshore terminals for distribution. Chosen routes are subject to significant constraints. Current techniques for pipe installation involve topsoil rem...

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Published inSoil use and management Vol. 31; no. 1; pp. 60 - 66
Main Author Batey, T
Format Journal Article
LanguageEnglish
Published Bedfordshire Published for the British Society of Soil Science by Blackwell Scientific Publications 01.03.2015
Blackwell Publishing Ltd
Wiley Subscription Services, Inc
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ISSN0266-0032
1475-2743
DOI10.1111/sum.12163

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Summary:Since the 1970s a network of underground pipes, up to 1200 mm diameter, has been installed in the UK to transmit crude oil to refineries and gas from onshore terminals for distribution. Chosen routes are subject to significant constraints. Current techniques for pipe installation involve topsoil removal and storage. Trench depth is set to allow a cover of 1200 mm overburden after pipes have been installed. The heavy machinery involved results in severe compaction of exposed subsoil. Subsoil is loosened comprehensively and topsoil replaced. Existing field drains are reconnected, and, if necessary, new drains with gravel backfill installed. Pipe installation usually takes place between April and October. Preventative measures to limit compaction during installation are not a practical option. If subsequent arable crops or grass are poorer or drainage more defective than before disturbance, the loss is assessed and compensation paid. To determine the cause of the loss >60, investigations have been made throughout the UK. Soil physical properties were assessed in an open trench using visual and tactile methods. Consistently, severe compaction in the subsoil was identified as the cause of poor crop growth or drainage; it was not observed in the topsoil. Specific recommendations for remedial action were made based on location, depth and severity of the compaction. These included the installation of additional land drains, increasing the amount of gravel above the drains, or further subsoil loosening orientated to cross gravel backfill. After appropriate remedial action, net compensation for crop losses was frequently small or negligible.
Bibliography:http://dx.doi.org/10.1111/sum.12163
ark:/67375/WNG-G4W591F7-K
Scottish Gas Network, National Grid and its predecessors Transco and British Gas
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ArticleID:SUM12163
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:0266-0032
1475-2743
DOI:10.1111/sum.12163