Pressure cells, are used to measure total pressure in soils, rock and concrete and at the interface between soil and natural or concrete abutment structures, as well as on foundation contacts. The knowledge of total pressure, in addition to pore pressure and deformations, is an essential component for the complete understanding of ground behaviour as well as the calibration of numerical models.
RST offers two models of pressure cells to suit the material to be monitored: total earth pressure cells are best for applications in soils such as earth embankments, dams, foundations, retaining walls, and piles, while vibrating-wire NATM stress cells are designed for use in concrete such as linings in tunnels and other underground workings.
As part of soil investigation programs, our vibrating-wire push-in pressure cells can be simply pushed into soil to measure total earth pressure and pore water pressure. Once in place, these pressure cells also monitor changes in active and passive pressure.
For monitoring stress change in soft rocks, RST’s borehole pressure cells, made for use in elastic and viscoelastic rock, consist in a flat pressure cell that measures stress in the plane perpendicular to the cell, and that can be used for monoaxial measurements or in groups of three in the same borehole for biaxial measurements of the two principal stresses. When used in rocks that exhibit plastic creep, the cell will not only measure stress change, but the final equilibrium pressure will approximate the in-situ stress as well.