Method and apparatus for measurement of in-situ horizontal stress by freezing of the ground in-situ
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United States of America Patent
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-
Sep 11, 1990
Grant Date -
N/A
app pub date -
Jun 7, 1989
filing date -
Jun 7, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A quality undisturbed sample of of cohesionless soil, in which the in-situ state of stress and strain is kept, can be obtained by in-situ freezing of the soil and subsequent removal of the frozen sample for testing. The in-situ horizontal stress in the cohesionless soil can be determined by the thawing the high quality undisturbed sample or, alternately, the frozen hole made in the frozen ground. A test apparatus and procedure for each of the two alternatives adjusts the pressure on the cylindrical sides of the sample or of the cored hole in the ground, to maintain the respective diameter as thawing occurs. The final pressure indicates the horizontal stress. In the case of testing the cylinder-shaped sample removed from the ground, it is loaded axially to reproduce the vertical load conditions at the level in the ground from where it was taken.
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