Drilling

Grampian Geotechnical offer 4 types of drilling: Rotary, Cable Percussive, Light Hydraulic Percussive and Hand Window Sampling. Find out more about our capabilities and equipment setups below.

Rotary

Rotary drilling techniques are utilised where drilling into very dense material or bedrock is required. The DANDO MTECH 6 is a multi-purpose rig. The DANDO can employ an open hole system, symmetrix casing system and can core to various depths (with varying diameters). In addition, the rig can also operate as a water well rig achieving depths of up to 150m.

Cable Percussive

Cable percussive drilling is the most common method of drilling in contemporary ground investigations. This method of drilling allows a disturbed and undisturbed sampling method to depths of 40mbgl. In-situ testing techniques includes standard penetration tests (SPT), permeability testing and shear vane testing. Various well pipe diameters can be installed for groundwater and gas monitoring.

Light Hydraulic Percussive Drilling

The Light hydraulic percussive rig is a small compact rig that can reach nearly any location. The rig is mounted on tracks, thus allowing access to soft ground surfaces and areas with difficult terrain. The rig is 800mm in width and can therefore fit through a standard doorway/gate. This rig is commonly employed when the borehole depth required is below 10 metres and the ground conditions are favourable (typically loose to dense material). A rig like the cable percussive has many in-situ capabilities such as standard penetrations tests, shear vane testing and permeability testing.

Hand Window Sampling

Hand window sampling is employed typically when subsoil analysis is required in areas with tight access, such as basement locations. Alternatively, this method is also used to achieve samples at depths greater than those that can be achieved with hand pitting methods at difficult locations.

Get in touch with Grampian Geotechnical about your project today.

"Grampian Geotechnical apply the principals of soil mechanics to practical problems to aid the development of contemporary design."

Neil Dawson, Director