Geomechanical Model Study of the Behavior of Underground Openings in Rock Subjected to Static Loads. Report 3. Tests on Lined Openings in Jointed and Intact Rock

摘要

The results of eleven geomechanical model tests are presented and discussed in the report. Six of these tests were on lined tunnels in solid test blocks and the remaining five tests were on lined tunnels in jointed test blocks. The size of the models tested was 24 in. x 24 in. x 8 in. Uniformly distributed loads up to 134 tons were applied to the 24 in. x 8 in. faces of the models. To maintain a plane-strain condition in the models, loads of up to 160 tons were applied to the top 24 in. x 24 in. face of the model to null strains parallel to the 8 in. dimension. Friction along the loading faces was controlled with sheets of teflon. The developments of jointed models and the instrumentation necessary for maintaining the jointed models are described. (Author)