Abstract
Complex geological conditions such as fault fracture zone will have a significant adverse impact on tunnel engineering, and collapse, large deformation, and other problems are prominent. The research on the large deformation mechanism and control of tunnel crossing fault fracture zone can provide guidance for tunnel safety construction. Based on the Jingzhai tunnel, combined with geological analysis, theoretical research, numerical simulation, and other means, this paper studies and analyzes the large deformation mechanism of the tunnel. The control effect of different advanced reinforcement measures is studied.
Highlights
Fault is the most common adverse geological phenomenon in tunnel construction. e distribution section of fault fracture zone is the most unstable section of tunnel surrounding rock
When the geological conditions are complex, weak surrounding rock, fault fracture zone, and other unfavorable geological distribution, the tunnel is prone to geological disasters. e rock mass in fault fracture zone is characterized by low strength, weak disintegration when meeting water, wide distribution of fractures, and irregular groundwater movement
When the tunnel passes through unfavorable geology, under the combined action of geostress, water pressure, and excavation disturbance, the tunnel is prone to collapse, water inrush, mud inrush, and other disasters
Summary
Fault is the most common adverse geological phenomenon in tunnel construction. e distribution section of fault fracture zone is the most unstable section of tunnel surrounding rock. When the geological conditions are complex, weak surrounding rock, fault fracture zone, and other unfavorable geological distribution, the tunnel is prone to geological disasters. Many scholars have done a lot of research on the stability of tunnel in fault fracture zone from collapse cases, internal deformation mechanism of surrounding rock, support structure, and other aspects. Wang et al [2] proposed a new model for predicting water inrush in karst tunnel. Wang et al [13] proposed the risk assessment method of karst tunnel water inrush interval. On this basis, the concept and calculation form of risk assessment model are introduced, and the risk environment, construction factors, and feedback information are analyzed. The paper puts forward the comparison of support methods such as advance grouting small pipe and advance bolt, which has guiding significance for engineering practice
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