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Cone Permeameter[TM]

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Tech ID: 307
Project Overview
The Cone PermeameterTM incorporates multiple pressure measurements along the axis of a cone penetrometer rod with a well-defined injection zone and a measured flow rate. The permeability value is obtained by applying a one-dimensional, spherical, steady-state Darcy flow model to the measured injection rate and pressure profile. Near to the injection point the pressure field is distorted by a combination of the cylindrical injection zone and the compacted soil near the rod surface. However, as the distance from the injection point is increased, the resulting pressure distribution will become spherical. As the radial distance from the source increases, the isobars intersect the cone rod in an almost perpendicular fashion, minimizing any azimuthal gradient that exists across the compacted annulus. By sensing the pressure gradient along the rod at a distance from the injection point, this method is able to essentially ignore the distortion of the pressure field near the injection zone.
Technology Description
The Cone PermeameterTM rod incorporates a proven fluid injection design and highly accurate pressure sensing elements embedded in the rod. The design allows the permeability meter measurements to be conducted simultaneously with standard Cone Penetrometer Test (CPT) cone measurements (pore pressure, tip and sleeve stress), which results in real-time, complementary data sets of soil type and hydrologic properties. The data system provides detailed analyses of pressure profiles and process histories for real-time display.

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