Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Deformation or change in stress after fracture – cutting – or...
Patent
1988-03-23
1989-03-21
Myracle, Jerry W.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Deformation or change in stress after fracture, cutting, or...
73153, 73784, G01N 1906
Patent
active
048132780
ABSTRACT:
A complete, three-dimensional stress state of underground rock is determined by a method which includes the steps of: drilling a rock to form a borehole with a substantially spherical bottom; deforming the borehole either by releasing the rock from the stresses by overcoring or by applying an external static pressure to the rock; and measuring displacements of the spherical bottom in at least xx, yy, zz, xy, yz and zx radial directions during the deformation of the borehole.
Director--General of Agency of Industrial Science and Technology
Myracle Jerry W.
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