山岭隧道病害整治方案效果对比研究与分析

Analysis and Comparative Study on the Effect of Disease Treatment Schemes of Mountain Tunnels

摘要: 本文以某山岭隧道病害整治为背景，以数值模拟的方法对比分析研究波纹钢结构的加固效果。首先聚焦隧道拱顶空洞和二衬厚度不足的病害类型，建立隧道有限元模型，再根据粘贴纤维布、粘贴钢板与波纹钢加固三种加固方案的特点，分别将其改进，建立加固后的有限元模型，最后对比分析计算结果，以探究波纹钢加固方案的加固效果。结果表明：1) 三种加固方式均无法有效控制拱顶沉降，但可有效限制水平收敛与二衬应力，波纹钢加固效果略好于钢板；2) 病害发生后波纹钢较钢板应力大，且拱肩处的应力和变形偏大，拱顶处沉降较大但应力偏小；3) 芳纶纤维布不适合在山岭隧道中用作加固结构。

Abstract: Based on the disease repair of a mountain tunnel, this paper compares and studies the safety of corrugated steel structure reinforcement schemes by numerical simulation. Firstly, the finite element model is established by focusing on the diseases of vault cavity and insufficient thickness of secondary lining of high-speed railway tunnel. Then, according to the characteristics of three reinforcement schemes of pasting fiber cloth, pasting steel plate and corrugated steel reinforcement, the strengthened finite element model is improved and established respectively based on the above model, and then the calculated structure is cross compared to analyze the reinforcement effect of corrugated steel reinforcement scheme. The results show that: 1) The reinforcement cannot effectively limit the vault settlement, but can effectively limit the horizontal convergence and secondary lining stress, and the reinforcement effect of corrugated steel is slightly better than that of steel plate; 2) After the disease, the stress of corrugated steel is larger than that of steel plate, and the stress and deformation at the arch shoulder are larger. Although the settlement at the arch crown is larger, the stress is smaller; 3) Aramid fiber cloth is not suitable to be used as reinforcement structure in mountain tunnel.