Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Earth stresses
Patent
1984-03-06
1986-06-17
Ciarlante, Anthony V.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Earth stresses
73151, G01N 300, G01N 332
Patent
active
045948992
ABSTRACT:
A method and apparatus for testing soil involves a probe with an inner cylinder insertable into the sample to be tested and rotatable through a limited arc of rotation. The inner cylinder may be rotated by an impulse, from an initial condition or by an oscillatory motion. An outer cylinder may be provided concentric to the inner cylinder and spaced therefrom to facilitate the measurement of liquefaction resistance and soil degradation. A motion sensor mounted on the inner cylinder enables the recording of the response of the cylinder and the soil to a particular rotary excitation. A shield may be provided about the upper end of the inner cylinder in order to allow measurements to be obtained from a region sufficiently below the surface of the soil so as to be relatively free from surface effects. A surface compression unit may be provided between the inner and outer cylinders which is operable to supply a pressure to compensate for the loss of overburden in downhole applications. The surface compression unit may also apply a rotating shear force to smooth the soil surface so that the pressure applied by the unit is uniform.
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Henke Robert
Henke Wanda K.
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