计算力学学报2026，Vol.43Issue(3)：509-516,8.DOI:10.7511/jslx20250428002
极软千枚岩隧道大变形力学机理与施工措施优化
Mechanisms of large deformation and optimization of construction strategies for tunnels in extremely soft phyllite
摘要
Abstract
To address the severe large deformation issues in tunnels constructed through extremely soft phyllite strata,this study integrates field monitoring and numerical simulation to investigate the deformation mechanisms of the surrounding rock and proposes a novel support system.Monitoring results reveal significant spatiotemporal asymmetry in deformation,with the cumulative displacement of the left haunch reaching 575 mm(71.6％higher than the right haunch).The deformation process exhibits a dual-phase evolution:rapid initial stress release(80％of total deformation within the first 30 days)followed by a mid-term secondary disturbance(rate resurgence to 10 mm/d at 40 days).A FLAC3D-based numerical model effectively replicates these patterns,demonstrating less than 10％average deviation from field data,and thus thereby validating its capability to capture high geostress-soft rock interactions.A"flexible-rigid collaborative phased control"support system is developed,incorporating sliding steel arch supports,asymmetric bolt densification and delayed secondary lining installation.This approach reduces total deformation by 40-50％and mitigates asymmetric displacement differences to below 30％.The proposed methodology establishes a systematic"deformation release-stress redistribution-structural reinforcement"framework,resolving the inadequacy of conventional rigid support systems under extreme deformation conditions.关键词
隧道工程/软岩大变形/实测数据/数值模拟/控制技术/支护体系Key words
tunnel engineering/large deformation of soft rock/measured data/numerical simulation/control technology/support system分类
交通工程引用本文复制引用
张保敏,石磊,李斌,张毅杰,陈希茂,王峥峥..极软千枚岩隧道大变形力学机理与施工措施优化[J].计算力学学报,2026,43(3):509-516,8.基金项目
大连理工大学重大成果转化项目(HX20221800)资助. （HX20221800）
