铁道标准设计2025，Vol.69Issue(10)：256-264,9.DOI:10.13238/j.issn.1004-2954.202504110001
含承压溶洞地层的盾构隧道掌子面最小防突岩体厚度预测
Prediction of Minimum Safe Thickness of Anti-Outburst Rock Mass for Shield Tunnel Face with Pressurized Karst Caves
摘要
Abstract
Water inrush at the tunnel face is a frequent hazard during shield tunneling in karst areas.Ensuring a safe thickness of the anti-outburst rock mass at the tunnel face can effectively prevent such disasters.Based on the Longling launching shaft-Pingdi station section of the Shenzhen-Huizhou intercity railway,six key factors influencing the safety of the tunnel face anti-outburst rock mass were identified.A three-dimensional numerical model was developed using 3DEC software to conduct orthogonal experiments investigating the minimum safe thickness of the anti-outburst rock mass ahead of the tunnel face under conditions involving confined pressurized karst caves.The results showed that by analyzing the experimental results through multiple regression fitting and machine learning,a predictive model for the minimum safe thickness of the shield tunnel face anti-outburst rock mass,considering confined pressurized karst caves,was established.By comparing the predicted calculation results with the results of existing theoretical formulas,the average accuracy exceeded 90％.The occurrence time of water inrush at the tunnel face could be comprehensively determined by taking the plastic zone distribution as the primary criterion and incorporating readily measurable factors such as tunnel crown displacement in practical engineering.Compared to the finite element method(FEM)and two-dimensional discrete element method(DEM),the three-dimensional DEM effectively represented the coupling effects between structural planes and water pressure.The findings can provide guidance for the safe design and hazard prevention of shield tunnels in karst areas.关键词
岩溶区盾构隧道/最小防突岩体厚度/机器学习/正交试验/离散元/流固耦合Key words
shield tunnel in karst area/minimum safe thickness of anti-outburst rock mass/machine learning/orthogonal experiment/discrete element method/fluid-solid interaction分类
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侯艳娟,董思宇,杨子怡,骆建军,娄在明,毛露露,夏武,王茉言..含承压溶洞地层的盾构隧道掌子面最小防突岩体厚度预测[J].铁道标准设计,2025,69(10):256-264,9.基金项目
国家自然科学基金项目(52278387) （52278387）
