Engineering Geology

Engineering Geology

Evaluation of rock burst phenomena in tunnel sites using experimental and semi-experimental methods – A case study: Haji-Abad tunnel in Hormozgan province

Authors
Behrooz Margan
Davood Fereidooni
Damghan University
10.22034/JEG.2024.18.1.101185
Abstract
In this research, various aspects of the rock burst phenomenon in the Haji-Abad tunnel site in the Hormozgan province have been discussed. Considering that the tunnel site is located in an active tectonized environment in terms of geological conditions and the depth of the tunnel in some parts reaches more than 100 to 253 m, and also considering the variety of rocks in the tunnel site, which are massive rocks with high strength up to broken fault zones, the importance of studying and investigating the phenomenon of rock burst is very important for the safety of the labor force and equipment and the stability of the underground space. For this purpose, the Haji-Abad tunnel site has been divided into ten units of engineering geological conditions using the BGD method, which includes eight units T1 to T8 and two crashed zones Tf1 and Tf2. Then, using common experimental and semi-experimental methods, the phenomenon of rock burst in the tunnel site has been evaluated. In the experimental procedure, Goel et al.'s criterion was used, according to which the rock burst phenomenon does not occur in any of the tunnel units. Using semi-empirical methods, including the criterion of linear elastic energy of the tunnel site units in the range of very low to moderate rock burst phenomena and using the tangential stress criterion, the site units in the medium to very high range and based on the stress criteria of these units in the moderate to high range and finally, using the fragility criterion, all site units are placed in the range of high rock burst.
Keywords
Haji-Abad tunnel
Rock burst
Squeezing
experimental and semi-experimental methods
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