复杂环境下地铁暗挖车站双侧壁导坑法支撑体系优化

重庆轨道交通10号线工程渝北广场站为大断面暗挖隧道,车站位于重庆市区繁华地段,为保证车站隧道的安全施工以及邻近既有建筑结构的安全,对暗挖隧道开挖施工方案进行优化设计。采用Midas GTS有限元数值软件,对弧形壁(原双侧壁)和直壁法(双侧壁)开挖方案进行全过程动态模拟,结合监控量测数据,综合对比分析隧道变形和支护结构内力。结果表明,本工程地质条件下,采用直壁法施工方案切实可行,研究成果可为类似地质条件中大断面隧道施工方案的优化设计和最终决策提供参考。

Support System Optimization of Double-side Wall Excavation Method for Subway Station Tunnel under Complicated Condition

Yubei Square Station on Chongqing rail transit line 10 is an island-platform subway station excavated with underground tunneling method. The station is located in a busy plot of Chongqing with existing buildings around. In order to guarantee the safety of the tunnel and the buildings during construction,the excavation scheme needs to be optimized. In this paper,finite element software Midas GTS is adopted to simulate dynamically the entire processes of the two excavation methods: arch wall( original double-side wall) method and straight wall( double-side wall) method. With reference to the field monitoring data,the comparative analysis of the tunnel deformation and structural internal force shows that the straight wall( double-side wall) method is applicable. The research results may provide references to optimizing the design of similar projects with medium and large cross-section tunneling.