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|Title:||Tunnel design by rock mass classifications|
|Authors:||Pennsylvania State University. Dept. of Mineral Engineering.|
Bieniawski, Z. T.
Park River project
|Publisher:||Geotechnical Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; GL-79-19 1990.|
Abstract: This report discusses tunnel design procedures based on various rock mass classification systems. A comparison is made between the tunnel support design based on the classical Terzaghi rock load method and the support selection based on the RSR Concept, the Geomechanics Classification, and the Q-System. These classificalion systems are described in detail and guidelines are given for step-by-step application of the three methods. Using an actual tunnel case history, an evaluation is made of the current design practice by comparing it with the design approaches involving the three rock mass classification systems. It is concluded that the current design practice may lead to overdesign of support, and recommendations are made for improved procedures that would ensure the construction of safe and more economical rock tunnels. Finally, a few areas are identified where more research would benefit the current tunnel design practice. In order to accomplish the main purpose of this report, namely to evaluate tunnel design practices with respect to rock mass classification systems, the following scope of work was defined: (a.) Review existing classification systems in rock engineering. (b.) Provide a user's guide for the most useful classification systems. (c.) Evaluate design practices on the basis of a selected tunnel case history. (d.) Identify practical steps leading to improved design of safe and more economical tunnels. (e.) Recommend research requirements needing immediate attention. The above scope of work was accomplished during this study, and the procedures, results, and discussions are presented in this report originally published in 1979 . The report was reprinted in FY 89 during which time a Bibliography covering the appropriate literature through 1986 as well as a discussion of recent developments, given in Appendix D, were added. NOTE: The report is a 1990 revised and reprinted version of TR-GL-79-19, as noted in the abstract.
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