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Keywords: tunnel crown
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Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-084
... ABSTRACT: In this paper a new solution for calculating the ground reaction curve at the tunnel crown around a circular tunnel, considering true triaxial stress state, is developed. The new solution is based on the unified strength failure criterion; thus it consists of a wide range...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2009, October 29–31, 2009
Paper Number: ISRM-EUROCK-2009-010
... excavation of the top heading, large karst cavities with widths of up to ten metres were encountered. The karst cavities were found to be part of an approx. 500–m–long cave. Further huge karst cavities were encountered with an overburden of about 8 m above the tunnel crown. structural geology karst...

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