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Trial pit n borehole
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Trial pit n borehole

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  • 1. • Excavation of ground in order to study or sample the composition and structure of the subsurface, usually dug during a site investigation, a soil survey or a geological survey.• To identify whether the site is suitable for the proposed work.
  • 2. • Shallow excavations to a depth no greater 6m. Depth Excavation Method 0-2m By Hand 2-4m Wheeled Back Hoe 4-6m Hydraulic Excavator• 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.
  • 3. ADVANTAGES DISADVANTAGES•Preferred for cohesive •Depth is limited.soil and soft rock. •Deeper excavation will•Easy dug / excavated require the human energy.using diggers.•Showing clear landstrata to facilitate roughinspections.
  • 4. HYDRAULIC EXCAVATORWHEELED BACK HOE
  • 5. • Excavations to a depth above 6m depth.• Excavation method using drilling rig machine.• Common method of site investigation.
  • 6. ADVANTAGES DISADVANTAGES•Can extract mineral • Require skilled workersresources. to do the work of drilling.•Work becomes easier and •Labor cost expensive.faster. •Noise that interferes with•Can excavated soils to a public.depth above 6m.
  • 7. Drilling rig machine