隧道鄰近邊坡崩坍整治處理案例

Case Study of Treatment for Landslide Caused by Tunnel Excavation

林峻弘(Chun-Hung Lin) ； 王文禮(Wen-Li Wang) ； 黃文(Wen Huang)

《地工技術》 72期 (1999/04) Pp. 35-44

https://doi.org/10.30140/SG.199904.0004

摘要

本文主要在探討南部某單線鐵路隧道因緊鄰邊坡，在隧道施工時引發邊坡崩坍之原因及其結果，並提出整治方案加以說明。調查結果顯示：影響本隧道之坍滑區共有三處，其中位於兩端洞口上方之邊坡坍滑係因洞口開挖所引致，再加上豪雨侵蝕使其更加擴大，惟洞口處之坍滑均屬淺層滑動。位於隧道中央之S2坍滑區即主要影響隧道路線之滑動區，其坍滑係屬深層滑動，隧道處的岩體受開挖擾動造成邊坡滑動抵抗力降低以及隧道偏壓為邊坡崩坍之主要因素。根據調查結果，本案之整治應以邊坡之穩定處理為先決條件，隧道偏壓則以減輕覆土重及採較剛性之支撐為宜。

關鍵字

崩坍 ； 隧道開挖 ； 整治 ； 偏壓

並列摘要

This paper describes the investigation and treatment of landslide caused by excavation of a single-track railway tunnel in Southern Taiwan.According to the results of investigation, there are three landslide areas along the tunnel. Two of them (S1 and S3) are located at portal areas, which were caused by portal excavation and enlarged after heavy rainfall. These landslides are categorized as shallow-depth ones compared to the major landslide zone (S2) located in the middle section of the tunnel. S2 landslide was caused by tunnel excavation and applied significant unbalanced pressure on the sidewall of the tunnel.The remedial measures applied to these landslide areas are stabilization of the slopes with anchor and rockbolt reinforcements. For S2 landslide, some of the overburden was removed to reduce the unbalanced pressure.

並列關鍵字

landslide ； tunnel excavation ； treatment ； unbalanced pressure