隧道洞口段支护结构受力特征分析

Stress Characteristics Analysis of Support Structure of Tunnel Portal Section

为了研究隧道洞口段支护结构力学特性,以铜盘山隧道左洞出口段为研究背景,通过对不同埋深、不同衬砌类型条件下支护结构受力进行监测,分析了支护结构受力随时间变化的规律及空间分布特征。研究结果表明:隧道洞身左侧受力情况比右侧复杂,最大受力点出现在拱顶或左拱腰位置,支护结构受力均较小,安全性得以保证。

In order to study the mechanical characteristics of the support structure at the tunnel portal section, this paper, based on the exit section of the left tunnel of Tongpanshan Tunnel, analyzes the changing law and spatial distribution feature over time of the stress of the support structure of different buried depths and different lining types. The research results showed that the stress on the left side of the tunnel body is more complicated than that on the right side, the maximum stress point appears at the vault or the left arch waist, and the support structure is less stressed, so the safety is guaranteed.