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Stability Assessment of Cross-Tunnels in Jointed Rock Using Discrete Element Method
Tunneling in jointed rock is always a challenge for the engineer on site, due to the existence of unfavorable lineages. The presence and orientation of fractures will affect the redistribution of stresses and any uncontrolled ground movement will induce additional loads on the boundary. Further the complexity arrives when two or more tunnels intersect each other, leading to more instability. Hence, discrete element modelling of Cross-tunnel was carried out considering, three tunnel shapes, i.e. D-shape, horseshoe tunnel with flat invert and horseshoe tunnel with curved invert. The analysis allowed the computation of the complete stresses and deformation patterns around the tunnel excavated in jointed rock conditions, comparing with Intact rock/continuum model. In discontinuum model (Jointed rock) model, in the vicinity of the openings, the surfaces are very much affected due to occurrence of tensile stresses and also, floor heaving and crown displacements were observed to be distinctive. This effect was relatively reduced for the case of horseshoe shaped tunnel with curved side walls and curved invert conditions.
Stability Assessment of Cross-Tunnels in Jointed Rock Using Discrete Element Method
Tunneling in jointed rock is always a challenge for the engineer on site, due to the existence of unfavorable lineages. The presence and orientation of fractures will affect the redistribution of stresses and any uncontrolled ground movement will induce additional loads on the boundary. Further the complexity arrives when two or more tunnels intersect each other, leading to more instability. Hence, discrete element modelling of Cross-tunnel was carried out considering, three tunnel shapes, i.e. D-shape, horseshoe tunnel with flat invert and horseshoe tunnel with curved invert. The analysis allowed the computation of the complete stresses and deformation patterns around the tunnel excavated in jointed rock conditions, comparing with Intact rock/continuum model. In discontinuum model (Jointed rock) model, in the vicinity of the openings, the surfaces are very much affected due to occurrence of tensile stresses and also, floor heaving and crown displacements were observed to be distinctive. This effect was relatively reduced for the case of horseshoe shaped tunnel with curved side walls and curved invert conditions.
Stability Assessment of Cross-Tunnels in Jointed Rock Using Discrete Element Method
Lecture Notes in Civil Engineering
Patel, Satyajit (editor) / Solanki, C. H. (editor) / Reddy, Krishna R. (editor) / Shukla, Sanjay Kumar (editor) / Kota, Vijay Kiran (author) / Juneja, Ashish (author) / Bajpai, R. K. (author) / Srivastava, Prateek (author)
2021-04-23
13 pages
Article/Chapter (Book)
Electronic Resource
English
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