英文篇名
THE GEOLOGICAL INVESTIGATION AND ITS APPLICATION OF THE PINGLIN PILOT TUNNEL
作者
張克平、劉弘祥
摘要
坪林隧道導坑為坪林主隧道施工前之地質探查隧道,其目的在於探查沿線地質構造及地質弱帶、辦理地工計測及試驗、瞭解TBM對不同岩體之鑽進行為、提前排除主隧道岩體內之地下水及提供主隧道施工期間之輔助通道等。本文將就本工程地質記錄、地工計測及地工試驗之整體流程及內容作扼要簡介,最後並說明將所獲得地質資料應用於推估主坑之成果。計測工作係利用監測儀器之安裝,作為隧道安全監測或岩盤力學參數評估之用。計測斷面依目的分類分為三型,其中A型斷面係為施工安全監測為主,包括收斂計測及頂拱沈陷計測,B型及C型斷面則除施工安全監測之考量外,並進行導坑沿線代表性岩盤變位計測及岩栓軸力計測等。地工試驗旨在獲取隧道沿線代表性岩盤力學參數,提供未來主隧道岩體分析與支撐設計之用。試驗種類包含現地試驗:平鈑載試驗、孔內變形試驗及套鑽法應力試驗,室內試驗包含動彈性試驗、單區試驗、三軸試驗、張力試驗等。
英文摘要
The Pinglin Tunnel of The Taipei-Ilan Expressway Project in Taiwan, which has a length of 12.9cm, will be the longest highway tunnel in Southeast Asia and the third longest one in the world. The construction of the pilot tunnel(φ= 4.8m), which is located between the two main tunnels(φ=11.6m), was started in August 1991, 18 months ahead of the scheduled excavation of the two main tunnels. The construction of the pilot tunnel is used to obtain parameters on geological conditions, to pre-treat poor strata and pre-drain groudwater, to experience the TBM in difficult ground and to serve as auxiliary tunnel during and after the construction of the two main tunnels. In this paper, the entrie procedure of geological mapping and rockmass classification whose data are stroaged and processed by the program TUNLOG, geotechnical testing and geotechnical monitoring will be briefly introduced. The geological information is then applied to predict the geological conditions during the excavation of the two main tunnels so that the risk can be minimized.