Experiences from in-situ stress measurement campaigns for a nuclear waste repository in Sweden
The site investigations carried out by the Swedish Nuclear Fuel and Waste Management Co (SKB) at two sites along the Swedish East coast included extensive stress measurements in slim bore holes down to 800 m depth for a repository sited within 400 – 700 m depth. Both sites are composed of crystalline rocks. The objective of the stress estimation campaigns was to contribute to the geoscientific understanding of the sites, as well as to provide input for preliminary design studies carried out at both sites. Triaxial overcoring, hydraulic fracturing and hydraulic tests of pre-existing fractures were used, as well as the indirect observations such as bore hole breakouts and core disking. The purpose of this paper is to present the strategy applied for assessment of the state of stress and the experiences gained by the extensive stress characterization campaigns at the two sites. An auditing process of measurement results and indirect observations of in-situ stress orientation and magnitudes is also presented, and the outcome of measurements with the two methods in different stress regimes is discussed.
R Christiansson C.D.Martin
Swedish Nuclear Fuel and Waste Management C., Stockholm, Sweden Dept. Civil & Engineering, University of Alberta, Edmonton, AB, Canada
国际会议
香港
英文
1-5
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）