深埋大断面地铁车站双侧壁导坑核心岩直立开挖施工技术研究

Research on Construction Technology of Core Rock Erecting Excavation of Double Side Wall-Heading Method in Deep Buried Large Section Metro Station

摘要: 重庆轨道交通10号线红土地站埋深94.467 m，断面最大开挖宽度26.2 m，高度21.567 m，断面面积475.8 m²，是目前国内埋深最大的大断面地铁车站，设计采用传统的双侧壁导坑法施工。为提高可操作性和加快施工进度，施工中采用了核心岩直立开挖技术。利用Midas-GTS (NX)建立地铁车站三维有限元计算模型，分析双侧壁核心岩直立开挖法施工过程对车站围岩和初期支护结构的应力、位移特征及稳定性的影响，验证了深埋大断面地铁车站双侧壁导坑法核心岩直立开挖技术的合理性和安全性，对红土地站后续施工和类似地质条件地铁工程建设具有指导意义。

Abstract: The Hongtudi station of Chongqing Rail Transit Line No. 10 has a depth of 94.467 m. The maximum excavation width of the section is 26.2 m, the height is 21.567 m, and the cross-sectional area is 475.8 m². It is the largest large-section subway station with the largest depth in China. The design uses traditional double side wall heading method for construction. In order to improve operability and speed up the construction progress, the core rock upright excavation technology was adopted in the construction. The three-dimensional finite element calculation model of metro station was established by Midas-GTS (NX), and the influence of the construction process of double-wall core rock upright excavation on the stress, displacement characteristics and stability of surrounding rock and initial support structure of the station was verified. The rationality and safety of the core rock vertical excavation technology of the double-wall guide pit method in deep-buried large-section subway station are verified, which is of guiding significance for the follow-up con-struction of the Hongtudi station and similar geological conditions subway construction.