Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Determination of the State of Stress at the Stripa Mine, Sweden
The state of stress at the Stripa Mine has been measured both in a 381-m-deep hole drilled from the surface and in holes drilled from the drifts underground. Hydraulic fracturing and several overcoring methods have been used (Lulea triaxial gauge, CSIRO gauge, USBM gauge, Swedish State Power Board deep-hole Leeman triaxial gauge). Propagation of the hydraulic fractures underground was monitored acoustically in an attempt to determine the location and orientation of the fractures. The results of overcoring and hydraulic fracturing agree well, particularly for the magnitude and orientation of the greatest stress. The hydraulic-fracturing data were interpreted using first-breakdown pressures and tensile-strength values determined using statistical fracture mechanics. Shut-in pressure values were obtained from semi-logarithmic plots of the post-breakdown pressure decay and from reopening the fractures at low pumping rates. (ERA citation 08:043363)
Determination of the State of Stress at the Stripa Mine, Sweden
The state of stress at the Stripa Mine has been measured both in a 381-m-deep hole drilled from the surface and in holes drilled from the drifts underground. Hydraulic fracturing and several overcoring methods have been used (Lulea triaxial gauge, CSIRO gauge, USBM gauge, Swedish State Power Board deep-hole Leeman triaxial gauge). Propagation of the hydraulic fractures underground was monitored acoustically in an attempt to determine the location and orientation of the fractures. The results of overcoring and hydraulic fracturing agree well, particularly for the magnitude and orientation of the greatest stress. The hydraulic-fracturing data were interpreted using first-breakdown pressures and tensile-strength values determined using statistical fracture mechanics. Shut-in pressure values were obtained from semi-logarithmic plots of the post-breakdown pressure decay and from reopening the fractures at low pumping rates. (ERA citation 08:043363)
Determination of the State of Stress at the Stripa Mine, Sweden
T. W. Doe (Autor:in) / W. A. Hustrulid (Autor:in) / B. Leijon (Autor:in) / K. Ingvald (Autor:in) / L. Strindell (Autor:in)
1982
13 pages
Report
Keine Angabe
Englisch
Results and Conclusions of Stress Measurements at Stripa
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