Assessment of chalk rock mass in excavations

B. Polishook, A. Flexer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Chalk is widely distributed and well exposed in Israel. For thousands of years tunnels for various purposes have been excavated in this rock mass. This paper focuses on the applicability of the Q and RMR rock mass classification to chalk. From field measurements undertaken in seven different tunnels it has been concluded that the Q and RMR classification methods were too conservative. It is therefore suggested that a modification of the present classification methods, or a new classification, based on the chalk's strength is required.

Original languageEnglish
Pages (from-to)145-150
Number of pages6
JournalBulletin of Engineering Geology and the Environment
Issue number2
StatePublished - Sep 1998


  • Chalk excavation
  • Israel
  • Q system
  • RMR system
  • Tunnels


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