A machine for static and dynamic triaxial testing
Tóm tắt
A machine has been developed for studying the static and dynamic triaxial constitutive behavior of large specimens of geologic and construction materials. Test specimens can also contain a cylindrical tunnel cavity to permit study of tunnel-reinforcement structures and rock-structure interaction. The specimens are 0.3 m in diameter and 0.3 to 0.45 m high; the model tunnels can be up to 50 mm in diameter. Static and dynamic triaxial loads can be applied with maximum pressures of 200 MPa in static tests and 100 MPa in dynamic tests. Dynamic loading can also be superimposed on a static preload as large as 20 MPa. To facilitate study of tunnel reinforcement, the tunnel is maintained at ambient pressure, with access at both ends for instrumentation and photography. Example results show the influence on tunnel deformation of loading rate as well as the presence of joints and their orientation. For a given allowable tunnel closure, substantially greater pressures can be sustained under dynamic loading than under static loading, and substantially greater pressures can be sustained by an intact specimen than by a jointed specimen.
Tài liệu tham khảo
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Heuer, R.E. andHendron, A.J., “Tests on Unlined Openings in Intact Rock,”DACA 39-67-C-0009, Department of Civil Engineering, University of Illinois, Urbana, IL (Feb.1971).
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Kennedy, T.C. and Lindberg, H.E., “Laboratory Investigation of Rock Cavity Reinforcement,” DNA 4023F, SRI International Final Report, Project 3743, Menlo Park, CA (Apr. 1976).
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Senseny, P.E. and Lindberg, H.E., “Theoretical and Laboratory Study of Deep-Based Structures, Volume II: Model Tests and Analysis of Mighty Epic Structures,” DNA 4425F-2, SRI International Final Report, Project 4121, Menlo Park, CA (Dec. 1977).
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