Plan your packer test stages by calculating the required gauge pressures based on site conditions.
The Packer Test Stage Gauge Pressure Calculator is designed to help geotechnical engineers plan in-situ permeability tests by calculating the required gauge pressures for each test stage. This tool simplifies the planning process and helps ensure tests are conducted at appropriate pressures.
| Test Stage | Maximum Test Pressure (Pmax) [kPa] | Percentage of Pmax [%] | Required Gauge Pressure (Pg) [kPa] |
|---|---|---|---|
| 1 | 0 | 0 | |
| 2 | 0 | 0 | |
| 3 | 0 | 0 | |
| 4 | 0 | 0 | |
| 5 | 0 | 0 |
This calculator uses the following formula to determine the required gauge pressure for each test stage:
Pmax = Poverburden - Pwater_column
Poverburden = γrock * Z
Pwater_column = (Z + Pg) * γw
Pg = (Percentage/100) × [Pmax - ((Hw + Hg) * Pw)]
Pmax = Maximum test pressure (kPa)
γrock = Unit weight of rock overburden (kN/m³)
γw = Unit weight of water (kN/m³)
Z = Depth to mid-point of test section (m)
Hw = Depth to initial groundwater level (m)
Hg = Pressure gauge height above ground level (m)
Percentage = Percentage of Pmax for the stage (%)
Use this calculator during the planning phase of packer tests to determine appropriate gauge pressures for each test stage. This helps ensure that tests are conducted at suitable pressures to characterize the hydraulic properties of rock masses without causing hydraulic fracturing.
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