Theoretical and Laboratory Study of Deep-Based Structures. Volume I. Triaxial Machine for Static and Dynamic Testing of 12-Inch Diameter Rocks.
Final rept. Feb 75-Aug 77,
SRI INTERNATIONAL MENLO PARK CA
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Design and fabrication of large-scale testing machine for static and dynamic testing of rock cavity reinforcement is described. The machine is patterned after a smaller prototype developed previously for DNA. The larger-scale machine can be used to apply static and dynamic triaxial loads on specimens that are 12 inches 0.3 m in diameter and 12 to 18 inches 0.3 to 0.45 m high, with rock cavities 2 inches in diameter. A variety of triaxial loadings are possible which permit laboratory simulation of different loadings imposed on deep-based structures in the field. The machine can apply vertical pressures up to 2 kbar 0.2 GPa statically and to 1 kbar 0.1 GPa dynamically. The maximum lateral pressure is 1.5 kbar 0.15 GPa statically or dynamically. The testing machiine can also be used to apply dynamic loading superimposed on a static preload. The static preload pressures can be as large as 0.2 kbar 0.02 GPa. The tunnel cavity is maintained at ambient pressure, with access at both ends for photography and electrical instrumentation. Author
- Geology, Geochemistry and Mineralogy
- Civil Engineering
- Test Facilities, Equipment and Methods