Field Density Test
The Field Permeability Test is conducted to determine the rate at which water can flow through rock formations at a site. It is an essential test in geotechnical and hydrogeological investigations for foundation design, dam construction, tunneling, and groundwater studies.
Field Permeability Test for Rock measures the rate at which water flows through rock formations to assess seepage and drainage characteristics. This test is essential for designing foundations, tunnels, dams, and retaining structures, as well as for groundwater and hydrogeological studies. By providing accurate field data, it helps engineers ensure safe, stable, and durable construction in rock formations
Methods of Field Permeability Test
1. Lugeon Test (Water Injection Test)
- Most commonly used for boreholes in rock.
- Water is injected under a controlled pressure (1–5 MPa) into a borehole section.
- Flow rate per meter of borehole is measured.
- Permeability is expressed in Lugeon units (1 Lugeon = 1 L/min per meter at 1 MPa).
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2. Packer Test (Single or Double Packer)
- Used for localized permeability assessment in fractured rock.
- Packers isolate a section of the borehole.
- Water is injected, and flow vs. pressure is recorded.
- Coefficient of permeability (k) is calculated using empirical formulas.