英文篇名
HEADTUNNEL COLLAPSE ACCIDENT AND ITS TREATMENT IN F3 FAULT IN NEW TIENLUN HYDROPOWER PROJECT
作者
曾錦鈴
關鍵字
層面斷層、迷你管幕工法
摘要
新天輪水力發電計畫之頭水隧道長達十公里半,沿線需貫穿多條斷層,其中以F3斷層規模最大。起初邁入F3斷層,並未如預料艱難,但仍十分謹慎開挖及支撐,開挖130公尺之斷層帶隧道後,不料開挖後部份斷層軟化,含水量飽和,導致抽心坍泥。歷經三次會議檢討,採行改線方案。然依據已開挖之地質,採取不同處理措施,有前進固結灌漿、迷你管幕工法、開挖後固結權漿、及排水等。歷時九個月,終於安然通過F3斷層。
英文摘要
There is a headrace tunnel, 10.5Km long, in NEW TIENLUN HYDROPOWER PROJECT. Its route went through many faults, of which F3 was the lwidest one among them. The excavation and support of F3 were not so difficult as expected, during the initial period, but these works were still ex-ecuted carefully. After 130m inlength had been excavated in this fault zone, the fault zone collapse accident happened unexceptedly, owing to the softening of the fault gorge and its saturation. Through three meetings, the proposal was to revise the route. Then many treatment methods were taken accor-ding to geological condition, namely consolidation grouting in advance, minipipe roof, consolidation grouting after the excavation and support, and drainage. Eventually it took 8 monthes to go through F3 fault zone.