賈儀平2006-07-252018-06-282006-07-252018-06-281999http://ntur.lib.ntu.edu.tw//handle/246246/11726台灣的交通建設逐漸往山區發展，而 穿越山區岩層的隧道施工往往會遭遇湧水 及地下水資源枯竭的問題。目前興建中的 北宜高速公路，在坪林隧道頭城段的導坑 施工即在四稜砂岩中屢遭湧水困擾，進度 幾近停頓；因此亟需對該地區之水文地質 及地下水系統有深入而詳盡的瞭解。本計 畫蒐集並分析頭城山區四稜砂岩附近的鑽 孔岩心試驗、觀測井水位資料及導坑湧水 量記錄，結果顯示四稜砂岩之粉砂岩及細 粒砂岩的孔隙具有中等的儲水能力，而岩 石的破裂面則具良好的導水能力，因此一 旦開挖面進入破碎帶時，初期的湧水量往 往很大，由於四稜砂岩中破碎帶的連通性 頗佳，可匯集廣泛地區之地下水，而且隧 道低於地下水面約三百公尺之多，因此在 四稜砂岩段的湧水常可維持相當長的時間。本研究利用本區調查研究結果所建立 之水文地質架構，以數值模擬方法分別探 討隧道施工前後的變化情況。施工前自然 地下水流模擬結果可初步提供研究地區的 水流方向及隧道沿線之水壓分佈情況；而 開挖後的模擬結果顯示，隧道沿線附近地 區地下水流有向導坑集中的現象，且開挖 面附近的地下水位變化較大，並可應用於 評估施工對附近地區水資源的影響。In the next century, most of the new freeways in Taiwan tend to pass through mountain areas. Construction of freeways through mountains are anticipated to encounter problems of ground water flow in tunnels and depletion of water resources in the nearly areas. The currently constructed Pinglin tunnel of Taipei-Ilan freeway has often been stucked due to large quantities of ground water flow in the Sezleng Sandstone of Toucheng area. In addition, dewatering of seepage in the tunnel could reduce the ground water level in the Sezleng Sandstone and spring flow in the nearby area. It is essential to understand hydrogeologic conditions in the area to resolve these problems. The proposed project will conduct surface hydrogeologic survey, borehole logging and analysis, monitoring of ground water level, hydrogeologic framework, modeling of regional ground water flow and tunnel ground water seepage in the Sezleng Sandstone of Toucheng area. Results of this study would provide fundamental hydrogeologic information for evaluating ground water flow in Pinglin tunnel and its impact on local water use. Moreover, the research would enhance the fundamental understanding concerning the ground water system in mountain areas and pave the way to resolve ground water seepage and water resources problems during the construction of tunnels in the future.application/pdf24645 bytesapplication/pdfzh-TW國立臺灣大學地質科學系暨研究所四稜砂岩地下水水文地質頭城Sezleng SandstoneGround WaterHydrogeologyTouchengreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/11726/1/882116M002025.pdf