Results and conclusions of stress measurements at Stripa
1983 (English)Conference paper, Presentation (Refereed)
This paper describes the results of stress measurements at Stripa, compares the results obtained by different techniques, and recommends a stress measurement program for a hard rock repository site. 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). The results of overcoring and hydraulic fracturing agree well, particularly for the magnitude and orientation of the greatest stress. A recommended program for stress measurement at a repository site would include hydraulic fracturing and deep-hole overcoring in a deep hole drilled from surface, and overcoring (Lulea gauge and USBM gauge) and hydraulic fracturing from holes drilled from underground openings when access is available. Propagation of the hydraulic fractures should be monitored acoustically to determine their location and orientation.
Place, publisher, year, edition, pages
Research subject Mining and Rock Engineering
IdentifiersURN: urn:nbn:se:ltu:diva-27107Local ID: 071cc412-c1a8-4707-a639-d481dcf49eafOAI: oai:DiVA.org:ltu-27107DiVA: diva2:1000288
Workshop on in site experiments in granite associated with geological disposal of radioactive waste : 24/10/1982 - 24/10/1982
Godkänd; 1983; 20120110 (andbra)2016-09-302016-09-30Bibliographically approved