Analysis and Model Studies of Underground Openings in Jointed Rock. Research on Rock Bolt Reinforcement.
Abstract
The report describes progress in a continuing study of behavior of underground structures in jointed rock. The first part of the report discusses finite element methods used in modeling the nonlinear aspect of joint behavior in a complexly jointed rock mass. The method is then examined critically be applying it in a computer simulation of a physical model study. The problem of size effect in tunnels (non-linear scaling of tunnel strength) is attacked by the finite element method and by physical model studies using a centrifuge. The finite element method was improved to handle large jointed rock systems with: elastic-plastic material properties for the joints in shear; no tension strength for the joints in extension; and limiting closability (with infinite strength) for the joints in compression. The program was then applied to effect a mathematical simulation of the physical model study conducted by L. Rosenblad. The computer simulation indicated the beginning of rock cracking at an external pressure of 165 psi, which compares favorably to the observed value of 190 psi. A parameter study of the block model problem was conducted to observe how different joint properties affect the modes of behavior and change the strength of the jointed rock structure. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1971
- Accession Number
- AD0727655
Entities
People
- Alain De Rouvray
- Francois Heuze
- Karel Drozd
- Richard E. Goodman
- Tor L. Brekke
Organizations
- University of California, Berkeley