Method of measuring material properties of rock in the wall of a borehole

Patent · 01 January 1985

OSTI ID:865416

Overmier, David K ^[1]

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1. Albuquerque, NM

To measure the modulus of elasticity of the rock in the wall of a borehole, a plug is cut in the borehole wall. The plug, its base attached to the surrounding rock, acts as a short column in response to applied forces. A loading piston is applied to the top of the plug and compression of the plug is measured as load is increased. Measurement of piston load and plug longitudinal deformation are made to determine the elastic modulus of the plug material. Poisson's ratio can be determined by simultaneous measurements of longitudinal and lateral deformation of the plug in response to loading. To determine shear modulus, the top of the plug is twisted while measurements are taken of torsional deformation.

• Research Organization: AT & T CORP
• DOE Contract Number: AC04-76DP00789
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4510799
• OSTI ID: 865416
• Country of Publication: United States
• Language: English

Related Subjects

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applied
applied force
applied forces
attached
base
borehole
borehole wall
column
compression
cut
deformation
determine
determined
elastic
elastic modulus
elasticity
forces
increased
lateral
load
loading
longitudinal
material
material properties
measure
measured
measurement
measurements
measuring
method
modulus
piston
plug
poisson
properties
ratio
response
rock
shear
shear modulus
simultaneous
simultaneous measurement
simultaneous measurements
surrounding
surrounding rock
top
torsional
twisted
wall