Extension of RMR and Q-system in Taiwan

The mechanism of tunnel engineering is quite complicated. At present, empirical methods are widely used in tunnelling design worldwide. In this application, rock mass classification is a vital tool because it embraces many factors that affect the stability of a tunnel and provides a simple and fast means of evaluation. Since 1970s, New Austrian Tunnelling Method (NATM) has been widely used in Taiwan. Q-system of Barton et al. and RMR system of Bieniawski are commonly used to classify the rock mass. However, local geologic characteristics have never been taken into considerations in these systems. It is necessary to review the adaptation of these systems and extend them on the basis of the domestic experience accumulated in past years. Beginning at discussing the applicability of existent rock mass classifications in Taiwan, this paper develops a new classification system for the use of local area. By using this system, we classify rock formations into four types: A, B, C, and D. (The distribution figure of these four rock types in Taiwan is shown on the right side.) Besides those parameters used in RMR and Q-system, we also consider local geologic material properties, geologic age, sensitivity to water and relevant strength characteristics, and then formulate the criteria for rating various rock types. The classification system has been verified in many projects of various geologic conditions in Taiwan. Moreover, this system has been recognized by the official authority and shall be used in local rock tunnelling industry. (A) "Reprinted with permission from Elsevier". For the covering abstract see ITRD E124500.

  • Availability:
  • Authors:
    • CHANG, C T
    • HOU, P C
    • LEE, M C
    • LEE, Y T
    • CHANG, P H
  • Publication Date: 2004-7

Language

  • English

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Filing Info

  • Accession Number: 01011600
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Dec 19 2005 3:20PM