摘要
围岩裂隙发育且存在软弱夹层时,将显著影响隧道衬砌结构的受力特性,导致出现不同程度的病害问题。本文针对某复杂地质条件下公路隧道出现的衬砌开裂、路面沉陷等病害,采用现场检测、室内试验和数值仿真相结合的方法对隧道病害产生机理进行深入分析,并提出综合处治措施,最后对处治后结构受力特性进行长期监测和评价。研究表明:病害段围岩破碎、节理裂隙发育且存在巨厚泥岩夹层;同时支护结构施工存在严重缺陷,两种不利因素的共同作用导致软弱夹层部位衬砌结构产生显著的应力集中,出现超过混凝土抗拉承载力的拉应力,导致混凝土开裂掉块,诱发隧道病害产生。
The development of fissure and the existence of weak interlayer in surrounding rock will significantly affect the stress characteristics of tunnel lining structure,resulting in different degrees of tunnel diseases.In view of the diseases such as lining cracking and pavement subsidence of a highway tunnel under complex geological conditions,in-depth analysis of the disease mechanism is carried out and comprehensive treatment measures to address the damage is proposed through the combination of field detection,laboratory test and numerical simulation.Finally,long-term monitoring and evaluation of the mechanical behavior of structure after treatment are conducted.The research shows that the surrounding rock of the diseased section is broken,fissures are developed,and there is a huge thick mudstone weak interlayer.Meanwhile,the supporting structure construction has serious defects.The combination of two unfavorable factors leads to the significant stress concentration of supporting structure of the weak interlayer part,and there is a tensile stress that exceeds the tensile bearing capacity of concrete,which causes concrete cracking and further induces tunnel disease generation.
作者
郭震山
GUO Zhenshan(Shanxi Transportation Technology Research&Development Co,Ltd,Taiyuan 030032,China;Key Laboratory of Highway Construction and Maintenance Technology in Loess Region of Ministry of Transport,Taiyuan 030032,China)
出处
《土木工程与管理学报》
2024年第1期39-44,共6页
Journal of Civil Engineering and Management
基金
山西省基础研究计划(自然科学研究面上项目)(20210302123359)。
关键词
公路隧道
裂隙发育
软弱夹层
病害机理
处治措施
highway tunnel
fissure development
weak interlayer
disease mechanism
treatment measure
