铁道标准设计2025，Vol.69Issue(10)：150-158,9.DOI:10.13238/j.issn.1004-2954.202505300005
基于混合FLAC-DEM的节理岩体TBM隧道围岩稳定性空间演化机制
Spatial Evolution Mechanism of Surrounding Rock Stability in TBM Tunnels in Jointed Rock Masses Based on Hybrid FLAC-DEM
摘要
Abstract
To investigate the spatial evolution of surrounding rock stability during tunnel boring machine(TBM)construction in jointed rock masses under complex geological conditions,this study focused on a typical TBM tunnel in high in-situ stress jointed rock strata.A hybrid finite difference-discrete element model(FLAC-3DEC)integrating continuous and discontinuous mechanics was proposed to establish a refined three-dimensional model simulating the entire TBM excavation process.The influence mechanisms of in-situ stress fields and joint spacing on surrounding rock stability were examined.The results showed that the instability of the surrounding rock underwent a progressive process,exhibiting significant spatial characteristics with increasing distance from the tunnel face.Based on numerical models,the nonlinear influence of in-situ stress on the stability of hard rock TBM tunnels was revealed,with 25 MPa identified as the critical stress.In low-stress zones(σ0＜25 MPa),a negative correlation between in-situ stress and instability was observed,while the correlation became positive in high-stress zones(σ0≥25 MPa).A critical joint spacing threshold of 0.8 m was identified.For spacing ≤0.8 m,the instability range decreased exponentially with increasing spacing,dominated by interconnected structural plane slip.For spacing＞0.8 m,the attenuation rate dropped sharply,and the failure mode transitioned to one dominated by rock matrix failure.This study elucidates the spatial evolution mechanism of TBM tunnel surrounding rock instability and critical effects of key parameters in complex geological environments,providing theoretical support for safe construction and disaster prevention in ultra-deep jointed hard rock tunnels.关键词
TBM隧道/节理岩体/围岩稳定性/混合FLAC-3DEC/临界效应Key words
TBM tunnel/jointed rock mass/surrounding rock stability/hybrid FLAC-3DEC/critical effect分类
交通运输引用本文复制引用
靳宏,于丽,王明年,秦幼林,王淞申..基于混合FLAC-DEM的节理岩体TBM隧道围岩稳定性空间演化机制[J].铁道标准设计,2025,69(10):150-158,9.基金项目
中国国家铁路集团有限公司科技研究开发计划项目(N2024G048) （N2024G048）
