防灾减灾工程学报2025，Vol.45Issue(5)：1125-1138,14.DOI:10.13409/j.cnki.jdpme.20250221001
活动断裂带结构分区对隧道错断变形特征的影响机制
Influence Mechanisms of Structural Zoning of Active Fault Zones on Dislocation and Deformation Characteristics of Tunnel Liners
摘要
Abstract
Permanent displacement caused by active fault zones can lead to serious deformation of tun-nel liners passing through them.To explore the influence of internal structural zoning of fault zones on the dislocation deformation of tunnel liners,this study summarized a generalized model for fault zone dislocation including the hanging wall,footwall,fracture zone,fault zone core,and rupture surface.By changing the mechanical parameters of rock mass in different zones of the fault,the width of differ-ent fault zones,and the location of the rupture surface,numerical experiments on the surrounding rock-tunnel liner were conducted.The longitudinal displacement gradient,longitudinal displacement curvature,and ellipticity were measured to characterize longitudinal shear deformation,longitudinal bending deformation,and cross-sectional deformation.The longitudinal and cross-sectional deforma-tion patterns of the liner were investigated,and the controlling mechanisms of fault zone structural zon-ing on tunnel liner deformation under fault dislocation were revealed.The results showed that:(1)un-der fault zone dislocation,the longitudinal displacement curve of the liner exhibited an"S"shape,with most displacements concentrated in the fault zone core.The shear deformation in the fault core zone was larger than that in other zones.The peak value occurred at the rupture surface,and the bending deformation mainly occurred near the interface between soft and hard rock masses.(2)The cross-sec-tional deformation of the liner was caused by the combined action of longitudinal shear and bending.The deformation in the fault zone core was significantly larger than that in the fracture zone.Special at-tention should be given to areas near the rupture surface and the interface between soft and hard rock masses.(3)The larger the difference in hardness between soft and hard rock masses in different zones and the smaller the ratio of fault core width to the total fault zone width,the more severe the longitudi-nal deformation and cross-sectional deformation of the liner located in the fault zone core.When the rupture surface occurred at the center of the fault zone core,the longitudinal deformation and cross-sectional deformation of the liner were the most severe.When the rupture surface was located at the in-terface between the fault zone core and the fracture zone,the damage range caused by the rupture sur-face increased.关键词
断裂带结构分区/断裂带错断/衬砌变形/位移梯度/位移曲率/椭圆度/数值分析Key words
fault zone structural zoning/fault zone dislocation/liner deformation/displacement gradi-ent/displacement curvature/ellipticity/numerical analysis分类
建筑与水利引用本文复制引用
孙鑫,李建贺,崔臻,盛谦,尹敬涵,张茂础..活动断裂带结构分区对隧道错断变形特征的影响机制[J].防灾减灾工程学报,2025,45(5):1125-1138,14.基金项目
国家重点研发计划青年科学家项目(2023YFB2390400)、中国科学院前瞻战略科技先导专项(XDA0420303)资助 （2023YFB2390400）
