边坡失稳引致隧道衬砌异状之探讨

Tunnel Lining Anomaly Induced by Adjacent Slope Instability

隧道系狭长之地下结构物,空间局限且力学上具高度静不定特性,长期稳定影响因素众多,及早掌握异状出现与否以及其变异之状况,分析引致异状的成因,并厘清相关的影响因素,为隧道维护管理作业极为重要的一环。依据台湾安全检测经验显示,边坡稳定性问题乃隧道长期稳定至为关键的影响因素之一。探讨边坡失稳引致的隧道衬砌异状,首先针对隧道与失稳边坡的相对空间关系,探讨异状的种类与形态;继而依据不同边坡失稳案例相关的隧道衬砌异状的变化,探讨失稳过程异状的进展;并据以建议安全检测与监测项目,以及有关的安全评估的看法。

Tunnels are long and narrow underground structures which have limited spaces and characteristics of statically in-determinant behavior. The long - term stabilities of tunnels are affected by numerous factors. Detecting the anomalies on tunnel as early as possible and having the variation of existing anomalies in hand are of importance for maintenance works, which provide valuable information for investigating the cause（ s ） and influence factors of the anomalies as well as for evaluation of structural safety of tunnels and for subsequently necessary repair measures. The results of safety inspections in Taiwan show that the long - term stabilities of tunnels are highly influenced by adjacent slope instabilities. In this article, the patterns on tunnel lining anomaly induced by slope instabilities are firstly investigated based on the relatively spatial location between tunnel and movement directions. Then the variation of anomalies corresponding to various situation of slope instabilities are discussed in details. Some suggestions concerned with tunnel inspection and safety evaluation are finally commented accordingly.