Trial pit n borehole

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Trial pit n borehole

  1. 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. 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. 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. 4. HYDRAULIC EXCAVATORWHEELED BACK HOE
  5. 5. • Excavations to a depth above 6m depth.• Excavation method using drilling rig machine.• Common method of site investigation.
  6. 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. 7. Drilling rig machine

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