超大跨软弱富水破碎岩层硐室群施工方法优化研究  

Optimization Research on Construction Method of Ultra Large Span Chamber Group Built in Weak Water-Rich Fractured Layer

作　　者：陈佳琪 CHEN Jiaqi(China Railway Construction Yunnan Investment Co.Ltd.,Kunming Yunnan 650000,China)

机构地区：[1]中铁建云南投资有限公司,云南昆明650000

出　　处：《铁道建筑技术》2025年第3期150-153,共4页Railway Construction Technology

基　　金：云南省交通厅科技项目(云交科教便[2020]50);中国铁建昆仑投资集团有限公司科技研究开发课题(KLTZ-KX01-2020-013)。

摘　　要：针对超大跨静电除尘硐室群穿越软弱富水破碎岩层施工困难的问题,采用有限元方法对硐室群开挖进行模拟,分析施工过程中围岩的稳定性,优化了施工工序及技术参数,包括直墙拱形大断面主机房、圆弧段和变截面过渡段的施工优化。研究结果表明:在直墙拱形大断面主机房的施工优化中,采用双向开挖、进尺2 m、三台阶开挖为最佳方案,并且在圆弧段中采用小断面隧道不会对主隧道造成影响,在变截面过渡段中采用小断面两台阶、大断面三台阶的方法提高了施工的便捷性和稳定性。最后,现场监测结果证明了开挖方法的有效性,研究成果可为类似项目提供参考。Based on the difficulty of constructing a group of ultra large span electrostatic dust removal chamber group crossing weak water-rich fractured layer,the finite element method was used to simulate the excavation of the chamber group,analyze the stability of the surrounding rock during the construction process.It also optimized the construction process and technical parameters,including the construction optimization of the straight wall arched large section main room,circular section,and variable transition section.The research results indicated that in the construction optimization of the straight wall arched large section main room,the best construction method was to use bidirectional excavation,2-meter footage,and three step excavation.Moreover,using a small section tunnel in the circular section will not affect the main tunnel,while using two step large section in small section to three step method in large section improved the convenience and stability of construction.Finally,the on-site monitoring results have demonstrated the effectiveness of the excavation method,and the findings can provide reference for similar projects.

关 键 词：软弱富水破碎岩层 硐室群开挖 数值模拟 工法优化 现场监测 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]