Stability analysis on tunnels with karst caves using the distinct lattice spring model
The effects of karst caves on tunnel stability were numerically investigated using the distinct lattice spring model (DLSM). The DLSM was validated by investigating the mechanical behavior of Brazilian discs with various sizes of central circular holes. Then, the effects of karst cave on U-shaped tu...
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doaj-20fa0331bed842e78237675023f80dd12021-07-17T04:34:59ZengElsevierUnderground Space2467-96742021-08-0164469481Stability analysis on tunnels with karst caves using the distinct lattice spring modelJianjun Ma0Junwei Guan1Junfeng Duan2Linchong Huang3Yu Liang4School of Civil Engineering, Sun Yat-sen University, Guangzhou 510275, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuahai), Guangdong Key Laboratory of Oceanic Civil Engineering, Guangdong Research Center for Underground Space Exploitation Technology, Zhuhai 519082, China; MOE Key Laboratory of Engineering Structures of Heavy Haul Railway (Central South University), Changsha 410075, ChinaSchool of Civil Engineering, Sun Yat-sen University, Guangzhou 510275, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuahai), Guangdong Key Laboratory of Oceanic Civil Engineering, Guangdong Research Center for Underground Space Exploitation Technology, Zhuhai 519082, ChinaChina Railway Wuhan Survey and Design & Institute Co. Ltd, Wuhan 430074, ChinaSchool of Aeronautics and Astronautics, Sun Yat-Sen University, Guangzhou 510006, ChinaSchool of Aeronautics and Astronautics, Sun Yat-Sen University, Guangzhou 510006, ChinaThe effects of karst caves on tunnel stability were numerically investigated using the distinct lattice spring model (DLSM). The DLSM was validated by investigating the mechanical behavior of Brazilian discs with various sizes of central circular holes. Then, the effects of karst cave on U-shaped tunnel were investigated under various karst caves positions (top, bottom, and right side of the tunnel), tunnel-cave distances (0.5–4 times the radius of the tunnel arc), and cave shapes (circular, rectangular flat, and rectangular vertical caves). The failure processes of the tunnel under those various conditions were analyzed and both the failure process and the final failure patterns of the tunnel were discussed. Numerical simulation demonstrated that karst caves around the tunnel could weaken the stability of the tunnel, indicating tunnel-cave distance effects. The closer the cave to the tunnel, the weaker the tunnel under loading. This effect was not significant when the tunnel-cave distance (d) was larger than three times the tunnel arc radius (R). In addition, the final failure pattern of the tunnel and its surrounding rock mass were dependent on both the position and the size of the cave. The larger the cave, the weaker the tunnel and its surrounding rock mass. Furthermore, compared with those cases with top and bottom caves, the tunnel with a right side cave had more impacts on tunnel stability. The main research finding could help engineers carry out stability analysis on tunnels in karst areas and take effective measures to enhance tunnel stability.http://www.sciencedirect.com/science/article/pii/S2467967420301082Stability analysisTunnelKarst caveDistinct lattice spring model |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jianjun Ma Junwei Guan Junfeng Duan Linchong Huang Yu Liang |
spellingShingle |
Jianjun Ma Junwei Guan Junfeng Duan Linchong Huang Yu Liang Stability analysis on tunnels with karst caves using the distinct lattice spring model Underground Space Stability analysis Tunnel Karst cave Distinct lattice spring model |
author_facet |
Jianjun Ma Junwei Guan Junfeng Duan Linchong Huang Yu Liang |
author_sort |
Jianjun Ma |
title |
Stability analysis on tunnels with karst caves using the distinct lattice spring model |
title_short |
Stability analysis on tunnels with karst caves using the distinct lattice spring model |
title_full |
Stability analysis on tunnels with karst caves using the distinct lattice spring model |
title_fullStr |
Stability analysis on tunnels with karst caves using the distinct lattice spring model |
title_full_unstemmed |
Stability analysis on tunnels with karst caves using the distinct lattice spring model |
title_sort |
stability analysis on tunnels with karst caves using the distinct lattice spring model |
publisher |
Elsevier |
series |
Underground Space |
issn |
2467-9674 |
publishDate |
2021-08-01 |
description |
The effects of karst caves on tunnel stability were numerically investigated using the distinct lattice spring model (DLSM). The DLSM was validated by investigating the mechanical behavior of Brazilian discs with various sizes of central circular holes. Then, the effects of karst cave on U-shaped tunnel were investigated under various karst caves positions (top, bottom, and right side of the tunnel), tunnel-cave distances (0.5–4 times the radius of the tunnel arc), and cave shapes (circular, rectangular flat, and rectangular vertical caves). The failure processes of the tunnel under those various conditions were analyzed and both the failure process and the final failure patterns of the tunnel were discussed. Numerical simulation demonstrated that karst caves around the tunnel could weaken the stability of the tunnel, indicating tunnel-cave distance effects. The closer the cave to the tunnel, the weaker the tunnel under loading. This effect was not significant when the tunnel-cave distance (d) was larger than three times the tunnel arc radius (R). In addition, the final failure pattern of the tunnel and its surrounding rock mass were dependent on both the position and the size of the cave. The larger the cave, the weaker the tunnel and its surrounding rock mass. Furthermore, compared with those cases with top and bottom caves, the tunnel with a right side cave had more impacts on tunnel stability. The main research finding could help engineers carry out stability analysis on tunnels in karst areas and take effective measures to enhance tunnel stability. |
topic |
Stability analysis Tunnel Karst cave Distinct lattice spring model |
url |
http://www.sciencedirect.com/science/article/pii/S2467967420301082 |
work_keys_str_mv |
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1721296850870337536 |