A14 Cambridge to Huntingdon Improvement Scheme | Causeway Geotech
May to November 2016; additional supplementary phases completed in 2017, 2018, 2019 and 2020
A14 Integrated Delivery Team (Balfour Beatty / Costain / Skanska JV)
Services (Technical Disciplines):
Ground investigation / Geotechnical and Geoenvironmental Engineering
Project Objectives/ Outcomes:
Causeway Geotech were appointed by A14IDT to carry out the Ground Investigation for the proposed bypass road between Huntingdon and Cambridge. The scheme covers a total of 35km and the investigation was scoped to provide assessment of geo-environmental conditions to assist the design and construction of the highway and associated structures.
The investigation was successfully completed under the supervision of a Chartered Engineer and five Site Engineers from Causeway Geotech working closely with the Client’s Representative and Client alike.
Causeway Geotech acted as the main ground investigation contractor for the scheme.
The scope of works included:
- 158 Cable Percussion boreholes to a maximum depth of 20m
- 83 Rotary cored holes using Geobor-S techniques to a maximum depth of 55m
- 43 Dynamic sampling boreholes to a maximum depth of 10m
- 3 Light Percussion boreholes with rotary follow on utilising a slope climbing rig to a maximum depth of 25m
- Static Cone Penetration Testing (CPTs) at 4 locations
- 87 Trial pits with a mechanical excavator to 4.5m depth.
- Insitu testing including SPTs, Dynamic Cone Penetrometer, Plate Loading Tests
- Monitoring installations including standpipes, gas monitor wells, piezometers and triple vibrating wire piezometers (VWPs) which were installed using cement bentonite grout.
- Site monitoring of water levels and gas concentrations, PID headspace readings, interface probe readings and VWP downloads.
- Specialist surveys including Laser Induced Fluoresence (LIF) and sampling for suspected anthrax.
The works were carried out across a variety of terrain including agricultural land, parkland, river banks, existing structures, carparks, existing road verges and carriageways under control of Traffic Management on day and night shift.
Geoscience Ireland Contact:
Darren O’Mahony (Darren.firstname.lastname@example.org)