- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | PENG Tao, QIAN Rui, YUAN Feiyun, REN Dongxing, FU Wenxi, YE Fei. Influence of Strong Seepage Fractures on Stability of Water-Resistant Rock Mass at Tunnel Face[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240625
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Water and mud inrush is one of the common geological disasters in karst tunnels, which poses a severe threat to the safety of tunnel construction and long-term operation. Therefore, ensuring the safety of water-resistant rock mass at the face is the key to the prevention and control of water and mud inrush disasters. To ensure the stability of water-resistant rock mass at the face under the action of strong seepage, a mechanical analysis model of water-resistant rock mass in strong seepage fractures at the tunnel face was constructed. The drag force effect generated by the water flow on the wall of the penetrating fracture was fully considered, and the minimum safe thickness formula of the water-resistant rock mass in the karst tunnel under the action of strong seepage was systematically derived. Parameter sensitivity analysis and engineering examples were employed; the stability of the surrounding rock during tunnel excavation was further investigated by using the finite-difference software FLAC3D, considering penetrating fractures and water-rich karst cavities ahead of the tunnel face; the influence mechanism of key parameters on the stability of the water-resistant rock mass was discussed in depth. The results show that the increase of fracture opening significantly enhances the effect of the drag force. Under the condition of strong seepage, the fracture drag force has a significant adverse effect on the minimum safe thickness of the water-resistant rock mass, and its influence degree increases nonlinearly with the increase of fracture opening. In addition, the influence of fracture at different location distributions on the minimum safe thickness shows significant differences. It is found that there is a critical transition point (height ratio of cantilever beams I and II = 5.07∶4.93) at which the upper and lower beams and slabs of the fracture are destroyed synchronously, which further reveals the internal relationship between the fracture location and structural instability. The findings of this study can provide a theoretical basis and engineering guidance for designing the thickness of water-resistant rock mass in karst tunnel face, mitigating karst-related disasters (e.g., grouting sealing, fracture reinforcement, and seepage control), selecting monitoring and early-warning indicators, and conducting risk classification during construction.
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