A numerical simulation using FLAC3D to analyze the impact of concealed karstic caves on the behavior of adjacent tunnels

M. Mahmoudi () and Ali M. Rajabi ()
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M. Mahmoudi: University of Qom
Ali M. Rajabi: University of Tehran

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2023, vol. 117, issue 1, No 24, 555-577

Abstract: Abstract The presence of karst cavities near the tunnels has a great impact on the behavior and deformation of the tunnels, making it necessary to study the impact of these cavities before starting the tunnel operation. A finite difference software (FLAC3D) was used to study the modeling of tunnels adjacent to karst caves and examine the effect of location, size, distance, shape, and arrangement of caves on displacements, bending moment, and axial force of the tunnel lining. In this study, an attempt has been made to investigate the effect of these karst cavities on the tunnel by approximate modeling of karst cavities around Shiraz-Bushehr railway tunnel. The results show that by increasing the dimensions of the karst cave, the axial force (N) increases when the cave is located below, top, and at the side of the tunnel, respectively. Moreover, when the cave is located below, top, or at the side of the tunnel, the bending moment decreases and increases, respectively. As the distance of the cave increases in the below of the tunnel span, the displacement of the tunnel ceiling increases, while the bending moment and axial force increase and decrease, respectively, depending on the size of the cave. With changing the location of the cave at a certain distance from the span toward the end of the tunnel, the displacement of the tunnel ceiling, bending moment, and axial force of the tunnel lining would decrease.

Keywords: Numerical simulation; FLAC3D; Karst environment; Tunnel; Limestone; Displacement; Impact (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s11069-023-05872-8

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