Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Earth stresses
Patent
1995-05-26
1996-11-19
Brock, Michael
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Earth stresses
73803, 73816, G01N 324
Patent
active
055764940
ABSTRACT:
A method and apparatus for testing the load-bearing capacity of a subterranean formation surrounding a concrete shaft and is made up of an expansion chamber at the bottom of the hole containing the shaft and fluid pressure and return lines which extend downwardly into communication with spaced outer peripheral portions of the expansion chamber so that when fluid is pumped into the chamber any entrapped air can be removed through the return line, and when grout is subsequently pumped into the chamber any fluid can be displaced through the return line. Telltale measuring rods extend downwardly into contact with spaced outer peripheral portions of the expansion chamber to measure displacement of the chamber when pressurized fluid is delivered into the chamber. The method of testing may be applied also in cyclical loading of the formation beneath the shaft to simulate a support structure which undergoes large fluctuations in loading, for example, of the type induced by an earthquake.
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Brock Michael
Reilly John E.
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