In situ measurement apparatus and method of measuring soil perme

Details In situ measurement apparatus and method of measuring soil perme In situ measurement apparatus and method of measuring soil perme

1998-04-15

2000-08-08

Larkin, Daniel S.

Measuring and testing

With fluid pressure

Porosity or permeability

7315241, 175 21, 175 50, G01N 1508

Patent

active

060984481

ABSTRACT:
An apparatus and method for discrete soil gas and saturated liquid permeability measurements with direct push emplacement systems (such as a cone penetrometer rod). A modified direct push emplacement system having at least one injection port and at least two measurement ports is first engaged to penetrate the soil to a predetermined depth. Gas or liquid is then injected into the soil at a predetermined location on the penetrometer rod. Next, a pressure response is recorded from each measurement port, which is at a known distance from the injection port (on the same penetrometer rod). This differential pressure response data allows calculation of the soil permeability directly by using a one-dimensional, spherical, steady state, porous flow model to measure the effective permeability of the soil, without substantial disturbance of the surrounding soil. The present invention minimizes false indications of reduced permeability as a result of soil compaction during the penetrometer emplacement.

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