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TRIAL PIT & BOREHOLE

TRIAL PIT AND BOREHOLE

Excavation of ground in order to study or sample the composition andstructureof the subsurface, usually dug during a site investigation, asoil surveyor ageological survey.To identify whether the site is suitable for the proposed work.TRIAL PITShallow excavations to a depth no greater 6m.

Support use are timbering, steel frames with hydraulic jack, battered or tapered side.Suitable for most low rise developments.Suitable for the investigation of all types of land.

DepthExcavation Method0-2mBy Hand2-4mWheeled Back Hoe4-6mHydraulic Excavator

3ADVANTAGESDISADVANTAGESPreferred for cohesive soil and soft rock.Easy dug / excavated using diggers.Showing clear land strata to facilitate rough inspections.Depth is limited.Deeper excavation will require the human energy.

HYDRAULIC EXCAVATORWHEELED BACK HOE

BOREHOLEExcavations to a depth above 6m depth.Excavation method using drilling rig machine.Common methodof site investigation.

ADVANTAGESDISADVANTAGESCan extract mineral resources.Work becomes easier and faster.Can excavated soils to a depth above 6m. Require skilled workers to do the work of drilling.Labor cost expensive.Noise that interferes with public.

Drilling rig machine