长大隧道不同工法衬砌结构安全性模拟分析

Simulation Analysis on the Safety of Lining Structure of Long and Large Tunnels by Different Construction Methods

为研究长大隧道在不同施工方法中对衬砌结构的影响,判定施工方法对隧道开挖的安全情况,本文从隧道衬砌结构受力的角度出发进行数值模拟分析,采用荷载结构模型对不同围岩条件下隧道结构安全性展开研究,利用安全系数的方法选取合理施工方法.从安全性定量计算,判别隧道在不同结构形式下安全性,从而可提前有效指导施工,避免施工过程中,隧道在结构受力不利部位发生开裂等问题,减少返工情况的发生,降低施工成本,保证施工安全,研究过程和成果可为今后类似工法优化提供一种研究思路.

In order to study the infuence of long and large tunnels on the lining structure in diferent construction methods and determine the safety of the construction method on tunnel excavation,the paper conducted a numerical simulation analysis from the perspective of the stress of the tunnel lining structure,and used a load strueture model for studying the safety of tunnel structure under different surrounding rocks conditions.The reasonable construction method was selected by the method of safety factor.From the quantitative calculation of safety,the safety of the tunnel under different structural forns was judged.The constnuction could be efctivele guided in advance,avoiding problems such as cracks in the structurally unfavorable parts of the tunnel during the construction process,and reducing the occurrence of rework and construction costs.The process and results can provide a research idea for the similar construetion in the future.