G-AM II Menard Pressuremeter
The G-AM II Menard pressuremeter is a borehole probe and control-unit system from Menard for measuring the in-situ stress-strain properties and bearing capacity of soils and very soft rock.
- Range
- 0-2.5, 0-6 and 0-10 MPa probe pressure gauges (ESS source text reads 0-25 MPa on the lowest gauge; not independently confirmed, see notes)
- Accuracy
- ±1% F.S. (pressure gauge)
- Max working pressure
- 10,000 kPa
Overview
In detail
How it works
The probe is a cylindrical body with an inner rubber membrane and outer protective sheath forming three independent cells; the central measuring cell is inflated with water while the guard cells are pressurised with gas, keeping deformation uniform along the probe. It is lowered into a pre-drilled borehole (or driven within a slotted casing) to test depth, and stress-controlled pressure increments are applied and held while volume change is read on a sight tube 30 and 60 seconds after each step.
Test results
Plotting injected volume against pressure gives an in-situ stress-strain curve. The limit pressure (PL) is the pressure at which failure occurs and relates directly to bearing capacity (Qa = (C/F) x PL); the modulus of deformation used for settlement calculations is derived from the same pressure-volume relationship.
Control unit
The control unit houses the regulators and valves that reduce and control pressure applied to the probe cells, plus a water reservoir supplying the measuring cell. Two pressure gauges are provided instead of a single delicate differential gauge, removing a common failure point. Coaxial tubing connects the probe to the control unit, with 25m, 33m or 50m lengths available.
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Specifications
Technical specifications
- Accuracy
- ±1% F.S. (pressure gauge)
- Range
- 0-2.5, 0-6 and 0-10 MPa probe pressure gauges (ESS source text reads 0-25 MPa on the lowest gauge; not independently confirmed, see notes)
- Max working pressure
- 10,000 kPa
- Volume scale accuracy
- ±0.1 cc (by-pass), ±5 cc (normal)
- Pressure supply
- Compressed nitrogen
- Probe diameter
- 44 mm (AX), 58 mm (BX), 70 mm (NX)
- Probe length
- 84 cm (AX), 70 cm (BX and NX)
- Probe weight
- 4.5 kg (AX), 4.3 kg (BX), 6.4 kg (NX)
- Tubing
- 25 m, 33 m or 50 m coaxial tubing
Related
Often specified alongside
Geosystems
Vibrating Wire Strain Gauge SM-5
- Range
- 3000 µε
- Accuracy
- +/- 0.5% F.S.
- Temp
- −20 to +80°C
- Range
- 200 to 35,000 kPa (standard steps up to 35,000 kPa)
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