CAJ | 학술논문

2009年8月8日莫拉克台风重创南台湾，嘉义阿里山区72 h的累积雨量高达2500 mm以上，百年历史的阿里山森林铁道因沿线路基严重流失而停驶。其中两处大崩塌路段的复建工程以顺应自然为原则，采取迂回隧道方式避开崩塌区，需克服沿线地质变化及地下水问题，评估结果是以凿岩机工法及钻爆工法进行开挖。两座隧道的西口段崩积层分别长达109.8、99 m，是隧道开挖阶段的关键地段。隧道开挖支撑设计系依据台湾岩体分类与支撑系统（PCCR 系统）及新奥工法的理念，沿线采用先进支撑材料包括超前管棚钢管、桁型钢支护、钢纤维喷射混凝土及自钻式锚杆等，除了可确保施工安全外，亦可提高施工进度。目前两隧道均已贯通且变形量控制均符合安全，说明隧道采用先进支撑方式穿越破碎崩积层段的成效良好，其研究结果可为相关工程设计提供参考。
2009년8월8일막랍극태풍중창남태만，가의아리산구72 h적루적우량고체2500 mm이상，백년역사적아리산삼림철도인연선로기엄중류실이정사。기중량처대붕탑로단적복건공정이순응자연위원칙，채취우회수도방식피개붕탑구，수극복연선지질변화급지하수문제，평고결과시이착암궤공법급찬폭공법진행개알。량좌수도적서구단붕적층분별장체109.8、99 m，시수도개알계단적관건지단。수도개알지탱설계계의거태만암체분류여지탱계통（PCCR 계통）급신오공법적이념，연선채용선진지탱재료포괄초전관붕강관、항형강지호、강섬유분사혼응토급자찬식묘간등，제료가학보시공안전외，역가제고시공진도。목전량수도균이관통차변형량공제균부합안전，설명수도채용선진지탱방식천월파쇄붕적층단적성효량호，기연구결과가위상관공정설계제공삼고。
On August 8, 2009, Typhoon Morakot hit southern Taiwan. It carried huge accumulated precipitation of 2,500 mm in 72 hours at Alishan area, and caused catastrophic erosion and landslide. Thus, the hundred-year historic Alishan Forest Railway was suspended due to serious embankment collapses. The rehabilitation principle for these two large embankment collapses followed the natural doctrine. Therefore, the D&B/Mechanical bypass tunnel was adopted to overcome the geological changes and groundwater problem in these two huge landslide areas. The lengths of west portal section colluviums of two tunnels were up to 99 m and 109.8 m, which were the crucial sections of tunneling engineering. The tunnel supporting system design was based on PCCR-system (Rock mass classification of Public Construction Commission)&NATM, and steel pipe roofing, lattice girders, and steel fiber reinforced shotcrete, as well as self-drilling anchors were adopted for increasing the safety and shortening the working days during construction. Currently, two tunnels have been driven through, and the amount of deformation was under control and in accord with safety level. This result indicates that implementation of pre-supporting system in drilling through the crushing colluviums section is effective, and can be used as a reference for the relevant engineering design.