Back Analysis in Rock Engineering

Shunsuke Sakurai

August 17, 2017 by CRC Press
Reference - 226 Pages
ISBN 9781138028623 - CAT# K26900
Series: ISRM Book Series


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  • Contains observational methods for making a bridge between theory and practice
  • Provides practicing engineers support by the theory of rock mechanics, not by engineering judgments
  • Back analyses allow for quantitative assessment of field measurement data obtained at construction sites
  • Factor of safety of slope and tunnels can be back-analyzed during construction on a real-time basis
  • The catastrophic failure of structures can be predicted during their construction by back analysis of field measurement results


This book provides practicing engineers working in the field of design, construction and monitoring of rock structures such as tunnels and slopes with technical information on how to design, how to excavate and how to monitor the structures during their construction. Based on the long-term engineering experiences of the author, field measurements together with back analyses are presented as the most powerful tools in rock engineering practice. One of the purposes of field measurements is to assess the stability of the rock structures during their construction. However, field measurement results are only numbers unless they are quantitatively interpreted, a process in which back analyses play an important role.

The author has developed both the concepts of “critical strain” and of the “anisotropic parameter” of rocks, which can make it possible not only to assess the stability of the structures during their construction, but also to verify the validity of design parameters by the back analysis of field measurement results during the constructions. Based on the back analysis results, the design parameters used at a design stage could be modified if necessary. This procedure is called an “Observational method”, a concept that is entirely different from that of other structures such as bridges and buildings. It is noted that in general, technical books written for practicing engineers mainly focus on empirical approaches which are based on engineers’ experiences. In this book, however, no empirical approaches will be described, instead, all the approaches are based on simple rock mechanics theory. This book is the first to describe an observational method in rock engineering practice, which implies that the potential readers of this book must be practicing engineers working on rock engineering projects.