偏压黄土隧道衬砌裂损分析及加固方案研究  

Lining crack damage and research on reinforcement scheme of bias-pressure loess tunnel

作　　者：贺晓铭 张好旗 张班 闫正冶 HE Xiao-ming;ZHANG Hao-qi;ZHANG Ban;YAN Zheng-ye(Henan Transportation Planning&Design Institute Co.,Ltd.,Zhengzhou 450000,China)

机构地区：[1]河南省交通规划设计研究院股份有限公司,河南郑州450000

出　　处：《河南城建学院学报》2023年第5期29-36,共8页Journal of Henan University of Urban Construction

摘　　要：根据某偏压黄土隧道衬砌裂损段落和地表裂缝的调查结果,采用有限元模拟计算衬砌断面典型部位损伤系数,并进行衬砌裂损原因分析和安全评价。在此基础上,提出3种衬砌加固处理方案,同时考虑加固处理后典型部位损伤系数、截面内力、强度安全系数变化,并从施工工艺、材料特性等方面进行综合比选。结果表明:陡坎地形和偏压使衬砌内力增大,冲沟沟谷汇集地表水软化土体强度,地表覆土和围岩变形难以控制,导致衬砌裂损;加固处理后多指标对比,推荐采用钎钉网喷高延性水泥基复合材料方案。Based on the investigation results of lining cracked sections and surface cracks in a bias-pressure loess tunnel,finite element simulation was used to calculate the damage coefficient of typical parts of the lining section,and the causes of lining cracks were analyzed and safety assessments were conducted.On this basis,three lining reinforcement treatment plans were proposed,taking into account the changes in damage coefficient,section internal force,and strength safety factor of typical parts after the reinforcement treatment,and comprehensively compared and selected from aspects such as construction technology and material properties.The analysis results show that the steep terrain and bias pressure increase the internal force of the lining,and the surface water collected in the gullies and valleys softens the soil strength,making it difficult to control the deformation of the surface covering soil and surrounding rock,resulting in lining cracks.After the reinforcement treatment,multiple indicators are compared,and it is recommended to adopt the scheme of brazed wire mesh spraying high ductility cement-based composite material.

关 键 词：黄土隧道 偏压 衬砌裂损 安全评价 加固处理 

分 类 号：U457.3[建筑科学—桥梁与隧道工程]