The pressuremeter consists of two parts, the read-out unit which rests on the ground surface, and the probe that is inserted into the borehole (ground). The original Ménard-type pressuremeter was designed to be lowered into a performed hole and to apply uniform pressure to the borehole walls by means of infl atable fl exible membrane.

As the pressure increases, the borehole walls deform. The pressure is held constant for a given period and the increase in volume required for maintaining the constant pressure is recorded. A load-deformation diagram and soil characteristics can be deduced by measurement of the applied pressure and change in the volume of the expanding membrane.

From the test readings (volume variation based on controlled pressure), a stress-strain curve can be obtained,

in the case of plane deformation, which yields :

• the Ménard Pressuremeter modulus

• the creep pressure

• the Menard limit pressure

Main Components


The Control Unit

Equipped with devices to precisely regulate the pressure applied to the probe and to read its volume changes with pressure increments and time. A nitrogen cylinder provides the pressure source. The box stands on a tripod.


The plastic tubing

This coaxial or twin tubing, fl exible, high resistance with small dilatation, connects the probe to the monitoring box.

 

The 3-cell probe

It includes a central measuring cell, fi lled with water. Its volume changes are read on the Control Unit volumeter. The probe is totally protected by a rubber cover (different types regarding soils stiffness) which is inflated by the gas to form the 2 guard cells. Pressures applied to the 3 cells are balanced through the differential pressure regulator to ensure a true cylindrical deformation along the measuring cell.


Standard: ISO 22476-4, ASTM D-4719-00

Main Technical Parameter

Model

PY-3

PY-4

PY-5

Cross-sectional area of test water tube

11.75cm 2

14.19 cm 2

14.19 cm 2

Volume of test tube

435 cm 3

638cm 3

638cm 3

Max. Test pressure

2.5Mpa

4Mpa

5.5Mpa

Naked dia.

Dia.50mm

Dia. With metal shield

Dia. 55mm

Length

500mm

Test length

250mm

Required borehole dia.

Dia. 52~Dia. 58mm

Original volume of pressuremeter chamber

491 cm 3

Min.reading of pressure gauge

0.005Mpa

Pressure source

High-pressure nitrogen pipe

Host dimension

830×360×220mm

Host weight

28kg


Product: Pressuremeter Civil Engineering Pressure Meter Test of Soil

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