阿里山森林鐵路隧道復建工程與環保對策

ALISHAN FOREST RAILWAY TUNNEL REHABILITATION PROJECT AND ENVIRONMENTAL PROTECTION MEASURES

劉弘祥(HONG-SHIANG LIU)

《工程環境會刊》 38期 (2018/01) Pp. 22-35

https://doi.org/10.6562/JEE.201801_(38).0002

摘要

原有阿里山森林鐵路主線多林段及屏遮那段即位於崩積層上，後因莫拉克颱風之超大豪雨導致主線上下邊坡大量崩塌，造成部分路段路基嚴重破壞。為使阿里山森林鐵路能在最安全且最經濟之前提下儘速復駛，研擬「順應自然、尊重自然、不對抗自然」之復建原則，採迂迴隧道方式避開大型崩塌區、銜接既有結構良好隧道以獲取最大效益、採直接進洞方式以縮小工程量體、提出洞口大範圍崩積層之最佳化設計、於工區內設置填土區以確保工期及減少環境衝擊等環境保護對策。

關鍵字

崩積層 ； 復建原則 ； 迂迴隧道 ； 填土區 ； 環境保護對策

並列摘要

The original Alishan Forest Railway main line was located on the colluviums, which, after the Typhoon Morakot, caused catastrophic erosion and landslide, resulting in some sections of serious embankment collapses. In order to make the Alishan Forest Railway back to service as soon as possible in the safest and most economical scenario, the rehabilitation principle of ＂conforming to nature, respecting nature and not against nature＂ was developed using the bypass tunnels to avoid large-scale collapse zone, connecting the existing intact tunnel to get the maximum benefits, adopting a direct approach to reduce the amount of the body, proposing optimal design on large-scale collapse of the portal area, setting up dumping field in the work area to ensure the duration and reduce the environmental impact measures.

並列關鍵字

colluviums ； rehabilitation principle ； bypass tunnels ； dumping field ； environmental protection measures