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Study of the Formation Process of Mud and Water Bursts During Tunnel Construction and the Influence of Fault Dip Angles
(1 Key Laboratory of Transportation Tunnel Engineering, Ministry of Education,Southwest Jiaotong University, Chengdu 610031; 2 Tianjin Municipal Engineering Design & Research Institute, Tianjin 120000)
Abstract Mud and water bursts are common phenomena when tunnels pass through water-rich fault zones and are serious disasters encountered during tunnel construction. In order to explore the formation process of mud and water bursts in tunnels and the influence of fault dip angles on the formation process in order to avoid serious engineering disasters, the processes of mud and water bursts induced by tunnelling in water-rich fault zones with different dip angels were simulated by Discrete Element Method(DEM) based on coupling the particle and fluid. In the simulation process, the development of fractures in surrounding rocks and the amounts of inrushing mud and water were traced and recorded, the formation processes of the mud- and water-bursting channels were analyzed, and the influence of fault dip angles on mud and water bursts was revealed. The study shows that the smaller the fault dip angles, the shorter the vertical distances between the fault and tunnel, and the more likely that mud and water bursts will occur and concentrate at the bottom of the working face. The study results provide a reference for the design of tunnel excavations in water-rich fault zones as well as for the forecast and prevention of mud and water bursts.
Abstract：
Mud and water bursts are common phenomena when tunnels pass through water-rich fault zones and are serious disasters encountered during tunnel construction. In order to explore the formation process of mud and water bursts in tunnels and the influence of fault dip angles on the formation process in order to avoid serious engineering disasters, the processes of mud and water bursts induced by tunnelling in water-rich fault zones with different dip angels were simulated by Discrete Element Method(DEM) based on coupling the particle and fluid. In the simulation process, the development of fractures in surrounding rocks and the amounts of inrushing mud and water were traced and recorded, the formation processes of the mud- and water-bursting channels were analyzed, and the influence of fault dip angles on mud and water bursts was revealed. The study shows that the smaller the fault dip angles, the shorter the vertical distances between the fault and tunnel, and the more likely that mud and water bursts will occur and concentrate at the bottom of the working face. The study results provide a reference for the design of tunnel excavations in water-rich fault zones as well as for the forecast and prevention of mud and water bursts.
.Study of the Formation Process of Mud and Water Bursts During Tunnel Construction and the Influence of Fault Dip Angles[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(5): 102-109
2015, Vol. 52 