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Title: STABILITY ANALYSIS OF HAZARDOUS WEDGES IN THE CROWN OF CIRCULAR TUNNEL
STABILITY ANALYSIS OF HAZARDOUS WEDGES IN THE CROWN OF CIRCULAR TUNNEL

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George Xiroudakis; Ilias Lazos
10.5593/sgem2023/1.1/s02.29
10.5593/sgem2023/1.1
1314-2704
978-619-7603-56-9
English
23
1
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
Hydrogeology, Engineering Geology and Geotechnics
The stability analysis of underground excavations is a crucial part of the design of underground excavations. One of the most common collapse hazards derives from rock mass cracking which creates potential wedge blocks falling or sliding into the tunnel. Many researchers have addressed this subject and are trying to resolve this critical issue for the safety of underground tunnels. The most extensive research involves implementing finite or discrete element numerical algorithms to analyze wedges. However, this analysis is time-consuming; alternative short stability assessment techniques are based on classification systems (e.g., GSI, RMR, Q etc.). Another widespread technique is block-theory, which kinematically considers the possibility of overhanging block collapse into the tunnel. These blocks' safety factor (SF) calculation is analyzed by performing several techniques. The most known is the calculation of pull-out force and stress relaxation, as well as the technique of shear strength analysis also used in Rocscience's Unwedge program. In this paper, the SF calculation techniques are reviewed and compared. An alternative methodology of calculating SF is proposed to extend their application to non-symmetric and polyhedral wedges.
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conference
https://doi.org/10.5593/sgem2023/1.1/s02.29
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Proceedings of 23rd International Multidisciplinary Scientific GeoConference SGEM 2023
23rd International Multidisciplinary Scientific GeoConference SGEM 2023, 03 - 09 July, 2023
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference-SGEM
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci and Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts and Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci and Arts; Acad Sci Moldova; Montenegrin Acad Sci and Arts; Georgian Acad Sci; Acad Fine Arts and Design Bratislava; Russian Acad Arts; Turkish Acad Sci.
243-250
03 - 09 July, 2023
website
9018
Prismatic wedge, tetrahedral wedge, falling safety factor, stresses relaxation, circular excavation