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Determination of Ground Pressure Existing in a Viscoelastic Rock Mass by Use of Hydraulic Borehole Pressure Cells.

Authors
Lu-PH
Source
Proc Internat Symp on Weak Rock Tokyo Japan Sept 21-24 1981 :7 pages
Link
NIOSHTIC No.
10006803
Abstract
Accurate magnitude of the biaxial ground pressures existing in a viscoelastic rock mass can be determined by pressure convergence tests with a combination of one cylindrical and two flat hydraulic pressure cells installed in a single hole drilled into that rock mass. Consequently, the triaxial ground pressures can be measured by drilling a pair of orthogonal holes for such instrumentation. Unlike most of the known methods of in situ stress determination that determine the magnitude of the stress indirectly from the elastic stress-strain relation by measuring strain or displacement in place and modulus of deformation in the laboratory, this method directly measures the in situ stress without any knowledge of the value of modulus of deformation. Furthermore, the complete state of stress existing in the viscoelastic rock mass also can be determined by this method if other techniques are supplemented for determining the directions of the principle stresses. In this paper, the theoretical background, measuring equipment, and measurement procedure are discussed.
Publication Date
19810101
Document Type
OP;
Fiscal Year
1981
NTIS Accession No.
NTIS Price
Identifying No.
OP 46-81
NIOSH Division
DRC;
Source Name
Proc. Internat. Symp. on Weak Rock, Tokyo, Japan, Sept. 21-24, 1981, 7 PP.
State
MA;
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