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Study on Water Inrush Mechanism and Control Measures for Water Bearing
Carbonaceous Phyllite Tunnels
(1. China Railway 17th Bureau Group Fourth Engineering Co. Ltd., Chongqing 401121; 2. School of Civil Engineering, Central South University, Changsha 410075)
Abstract Serious water inrush event occurred when the small mileage section of No. 4 inclined shaft of Ganzhuang
tunnel on Yuxi-Mohan Railway passed through the water-rich carbonaceous phyllite layered stratum, and the surrounding rock was weak, water-rich, broken and changed frequently. Through the site investigation on water environment and ground conditions, combined with the features of water inrush disaster and evolutionary regularity of cavity,the catastrophic mechanism of water inrush in tunnels is illustrated from three stages: energy storage, energy release and triggering due to construction disturbance. It is pointed out that the failure mechanisms of water inrush include bending failure, shear failure and infiltration failure. The prevention and control process as well as the specific control measures against water inrush in water-rich carbonaceous phyllite tunnel are put forward, and the determination method of tunnel risk section and the control method of water inrush are clarified, including reinforcement measures such as the pre-grouting, the dense rows of pipe-roof and local advanced grouting. The field application shows that
the water inrush disaster in the tunnel has been controlled, indicating that the water inrush prevention and control measures can effectively control the impact of water inrush in surrounding rock and ensure the safety and stability of the tunnel structure.
Abstract：
Serious water inrush event occurred when the small mileage section of No. 4 inclined shaft of Ganzhuang
tunnel on Yuxi-Mohan Railway passed through the water-rich carbonaceous phyllite layered stratum, and the surrounding rock was weak, water-rich, broken and changed frequently. Through the site investigation on water environment and ground conditions, combined with the features of water inrush disaster and evolutionary regularity of cavity,the catastrophic mechanism of water inrush in tunnels is illustrated from three stages: energy storage, energy release and triggering due to construction disturbance. It is pointed out that the failure mechanisms of water inrush include bending failure, shear failure and infiltration failure. The prevention and control process as well as the specific control measures against water inrush in water-rich carbonaceous phyllite tunnel are put forward, and the determination method of tunnel risk section and the control method of water inrush are clarified, including reinforcement measures such as the pre-grouting, the dense rows of pipe-roof and local advanced grouting. The field application shows that
the water inrush disaster in the tunnel has been controlled, indicating that the water inrush prevention and control measures can effectively control the impact of water inrush in surrounding rock and ensure the safety and stability of the tunnel structure.
ZHANG Jianfeng1 ZHENG Xiaoyue2 YU Guoliang1 SHI Chenghua2
.Study on Water Inrush Mechanism and Control Measures for Water Bearing
Carbonaceous Phyllite Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(5): 221-227
2022, Vol. 59 