Cable Percussive Boring
For years, cable percussion, also known as shell and auger, boring has been a fundamental part of ground investigation in the UK.
Depending upon access limitations and favourable ground conditions, boreholes up to 50m depth can be formed. They allow samples to be taken for both geotechnical and contamination laboratory testing and a variety of in-situ tests, including shear vane, permeability and Standard Penetration Tests (SPTs) can be carried out within them.
Cable Percussive Boreholes for Piled Foundation Design and Settlement Analysis
Cable percussive boring was undertaken as part of a geotechnical investigation to determine the ground profile for piled foundation design and assess the settlement of soft and compressible ground beneath a proposed embankment at the site of a proposed residential development in Shropshire.
Cable percussive boring was considered the most suitable method for this project as they facilitated the recovery of relatively soft soils to depths of up to 20m, which could not have been achieved using dynamic sampling/ windowless sample boreholes, trial pits or conventional rotary boreholes.
In addition to facilitating in-situ standard penetration tests (SPTs), the cable percussive boreholes allowed undisturbed samples to be taken for undrained triaxial and oedometer consolidation laboratory testing to be carried out, for foundation design and settlement analysis.