Borehole dilatometer intensifier
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United States of America Patent
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-
Mar 29, 1988
Grant Date -
N/A
app pub date -
Feb 18, 1986
filing date -
Sep 9, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A highly portable pressure intensifier for use with a borehole dilatometer head having an expandable body defining an internal cavity to measure deformation properties of in-situ rock masses. The housing of the intensifier comprises two axially aligned interconnecting cylinders, one of which is of substantially larger diameter. The larger cylinder has a reciprocating piston mounted therein, the piston having a plunger portion which extends axially into the smaller cylinder. The smaller cylinder is connected to the cavity of the dilatometer head by means of high pressure tubing. The larger cylinder is filled ahead of the piston with a first working liquid. The second cylinder, the dilatometer head cavity and the interconnecting tubing are filled with a second working liquid. Increasing the pressure of the first working liquid displaces the plunger portion into the smaller cylinder, substantially increasing the pressure of the second working liquid, which latter increase causes the dilatometer head to expand so as to deform the rock of the borehole in which it is placed. A pressure transducer and a linear variable differential transformer are provided for deriving signals representing changes in pressure and volume respectively.
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