INVESTIGATION AND GEOTECHNICAL DESIGN OF DUAL CARRIAGEWAY BYPASS

A section of new dual carriagway was required to by-pass a village adjacent to Exeter International Airport in Devon. South West Geotechnical were instructed to carry out a factual and interpretative ground investigation for the works.

Field work included ten cable percussive boreholes, twenty trial pits, in-situ CBR testing, and soakaway testing.

Laboratory work included extensive suites of compaction, MCV, CBR and drained shear box testing.

All drilling, laboratory and reporting works were carried out using SWG’s own in-house resources.

The 1km route included deep cuttings, sidelong embankments, a cut and cover tunnel beneath the flight path into Exeter Airport, various structures, and a SUDS soakaway system.

SWG’s approach was to create an accurate and detailed geotechnical model of the site, and then to classify all the materials encountered. These were then analysed for all the required parameters for design.

Cutting and embankment slopes were designed using Slope/W software, and soakaways using BRE 365 methodology and software.

Cutting & embankment slope Diagram >>

Geological Long Section Diagram >>

Investigation And Geotechnical Design Of Dual Carriageway Bypass


Cutting & embankment slope Diagram


Geological Long Section Diagram