Numerical Simulation of the Process of Tunnel Approaching Karst Cave Considering Fluid-Solid Coupling

DOI

10.2991/978-94-6463-932-2_12How to use a DOI?

Keywords

Tunnel Engineering; Karst cave; Water Inrush; Fluid-Solid Coupling

Abstract

It is generally believed that under the combined effects of construction disturbance and high water pressure, the collapse or hydraulic fracturing of anti-inrush rock masses between tunnels and unfavorable geological structures constitutes the primary factor inducing water inrush accidents. Consequently, investigating the instability mechanism of anti-inrush rock masses holds significant importance for tunnel construction. Taking the Qinhe Tunnel of the Dianzhong Water Diversion Project as the engineering background, this study establishes a mathematical model for the instability failure of anti-inrush rock masses during tunnel approach toward water-rich karst caves. Utilizing Comsol software, the dynamic evolution patterns of stress fields and seepage fields in surrounding rock during the tunnel's approach to water-rich karst caves are simulated and analyzed. The research findings indicate that: At 7.5 m from the karst cave, the plastic zone connects to form a water inrush conduit, defining the minimum safety threshold; Displacement exhibits three-stage mutation; Seepage velocity evolves asymmetrically, forming concentrated channels and high-velocity zones near the cave; Permeability coefficient peaks at the critical distance due to pore reorganization, then mutates from localized pathways. This research provides theoretical support for water inrush prevention and safety rock plate design in karst tunnels.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Ran Xu
AU  - Qigui Yang
AU  - Xiaokang Shao
PY  - 2025
DA  - 2025/12/22
TI  - Numerical Simulation of the Process of Tunnel Approaching Karst Cave Considering Fluid-Solid Coupling
BT  - Proceedings of the 2025 2nd International Conference on Civil Engineering Structures and Concrete Materials (CESCM 2025)
PB  - Atlantis Press
SP  - 95
EP  - 107
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-932-2_12
DO  - 10.2991/978-94-6463-932-2_12
ID  - Xu2025
ER  -