A New Method of Rock Stress Management With Hydraulic Borehole Pressure Cells.
Proc Int'l Symp on Rock Stress & Rock Stress Meas Sweden Spet 1986 :237-245
This paper presents basic principles and required instrumentation for rock stress measurements with Bureau of Mines hydraulic borehole pressure cells. Existing stresses and stress changes can be measured with the same instrumentation. Based on the elastic theories of plates and thick-walled cylinders, the magnitude of biaxial rock stresses existing in a rock mass can be determined by pressure convergence-divergence tests using a combination of one cylindrical and two encapsulated flat hydraulic borehole pressure cells installed in a single drill hole. Case studies are included to demonstrate the validity of the technique.
Proc. Int'l Symp. on Rock Stress & Rock Stress Meas., Sweden, Spet. 1986, PP. 237-245