双导洞三台阶法超大断面暗挖车站施工稳定性分析OA

To thoroughly investigate the mechanical behavior and engineering characteristics of the double-arch three-step method during construction,this study took an extra-large section underground station from a certain subway as the analysis object.A combined approach of field monitoring and numerical simulation was employed to analyze and calculate structural stability under different working conditions,compare the advantages and disadvantages of various support schemes,and propose optimization design recommendations.By analyzing the application of the double-arch three-step method in extra-large section underground stations,the study identified key factors affecting structural stability,optimized support schemes,and enhanced construction safety and efficiency.The results show that,during the construction of extra-large section underground stations,station depth,pre-reinforcement range of surrounding rock,and step length have the most significant impact on arch settlement,requiring special attention to changes in surrounding rock at the station arch.By comparing different support schemes,construction safety and efficiency can be significantly improved.