基底围岩弱化作用下隧道衬砌结构受力特征研究  

STUDY ON THE STRESS CHARACTERISTICS OF TUNNEL LINING STRUCTURE UNDER THE WEAKENING EFFECT OF SURROUNDING ROCK AT THE BASEMENT

作　　者：蔡东 Cai Dong

机构地区：[1]四川省交通建设集团有限责任公司,成都610047

出　　处：《建筑技术开发》2025年第2期120-122,共3页Building Technology Development

摘　　要：在隧道运营过程中,地下水弱化仰拱基底以下的围岩,导致仰拱隆起和衬砌结构破坏。基于现场钻芯取样,结合数值模拟方法分析在基底围岩弱化程度不同时二次衬砌结构的受力特征。研究结果表明:基底围岩弱化会造成边墙开裂和仰拱隆起,随着基底围岩弱化程度的增加,二次衬砌结构的位移也随之增加。在最大主应力中,随着基底围岩劣化程度的增加,墙脚位置的压应力增长幅度最高。在最小主应力中,二次衬砌各位置中除仰拱外,其余位置均承受压应力,且仰拱位置承受的拉应力增长率约为173.72%。During the operation of the tunnel,groundwater weakens the surrounding rock below the arch base,resulting in arch uplift and damage to the lining structure.This article is based on on-site core sampling and combines numerical simulation methods to analyze the stress characteristics of the secondary lining structure under different degrees of weakening of the foundation surrounding rock.The research results indicate that the weakening of the surrounding rock of the foundation will cause cracking of the side walls and uplift of the arch.As the degree of weakening of the surrounding rock of the foundation increases,the displacement of the secondary lining structure also increases.In the maximum principal stress,as the degree of degradation of the surrounding rock increases,the increase in compressive stress at the foot of the wall is the highest.In the minimum principal stress,all positions of the secondary lining,except for the inverted arch,bear compressive stress,and the tensile stress growth rate at the inverted arch position is about 173.72%.

关 键 词：弱化效应 数值模拟 衬砌结构 受力特征 

分 类 号：U456[建筑科学—桥梁与隧道工程]