To investigate the suitability of subsurface conditions for safely hosting a deep geological repository for radioactive waste in Switzerland, Nagra performs geological investigations within the framework of the deep boreholes Tiefbohrungen (TBO) project. An important aspect of these investigations includes the determination of rock mechanical properties of the drilled formations. The execution and documentation of rock mechanical laboratory testing of core material from the TBO boreholes is the subject of this tender. The aim of the rock mechanical tests is to quantify mechanical properties of the drilled formations by characterization of in-situ properties and stress conditions. Three classes of tests are to be performed: unconfined compressive strength tests; Brazilian tensile strength tests; triaxial compression tests (including concurrent measurements of acoustic velocities).

It is planned to award a contract to 2 bidders for a given minimum number of tests per test class.

To investigate the suitability of subsurface conditions for safely hosting a deep geological repository for radioactive waste in Switzerland, Nagra performs geological investigations within the framework of the deep boreholes Tiefbohrungen (TBO) project. An important aspect of these investigations includes the determination of rock mechanical properties of the drilled formations. The execution and documentation of rock mechanical laboratory testing of core material from the TBO boreholes is the subject of this tender. The aim of the rock mechanical tests is to quantify mechanical properties of the drilled formations by characterization of in-situ properties and stress conditions. Three classes of tests are to be performed: unconfined compressive strength tests; Brazilian tensile strength tests; triaxial compression tests (including concurrent measurements of acoustic velocities).

It is planned to award a contract to 2 bidders for a given minimum number of tests per test class.