早期隧道工程數值分析，對於隧道開挖面受到前方地質變異性影響方面，所能提供作為預警的訊息相當有限，因此常發生許多嚴重的工程災難。近年來，根據國內外學者的研究報告中指出，隧道開挖面附近的縱向變位，會因受前方地質條件會產生不同的變化，而本研究便是以此的理論為基礎，並利用美國Itasca Consulting Group Inc.所研發出之軟體FLAC3D 2.00版作為分析工具，並引用曾文越域引水隧道地質條件當作主要分析參數，模擬隧道開挖面通過不同地質強度及接近垂直與傾斜地質交界面時，觀察隧道開挖面接近地質交界面時頂拱與側壁變位和縱向應力變化情況，並繪製影響線、趨勢線及位移向量方位趨勢線，作為預測開挖面前方地質狀況之依據。

　　研究結果顯示，不論地質界面為垂直或傾斜狀態，當開挖面由較硬地質區往軟弱地質區掘進，當開挖面逼近地質交界面時，其影響線與趨勢線及位移向量方位趨勢線會因受到地拱效應作用，使應力朝向軟弱地質區釋放，使的頂拱與側壁之變形量產生明顯的遞增，反之，當開挖由軟弱地質區向較硬地質區掘進時，由於應力在朝向較硬地質區釋放時，被前方較硬的地質壓抑住，使的頂拱與側壁之變形量產生明顯的遞減。

　Earlier, numerical analysis could only provide limited warning information for tunneling because the excavated tunnel surface was mainly influenced by the in-situ geological variability. Many serious disasters caused by the geologic conditions happened during excavation. Therefore, a three-dimensional numerical code, called FLAC3D, was used to analyze the excavation of tunnel through the interface of different geological conditions. The plots of influence lines, trend lines, and displacement vector orientation trend lines were used to predict the geological condition ahead of the excavation face. The results show that the stress redistribution is different for various rock conditions. The vertical stress would have the concentration effect on the crown. Therefore the reduction range of longitudinal stress would be decreased obviously if the rock is hard ground ahead of the excavation face. On the contrary the reduction of longitudinal stress would be increased obviously if the rock is weak ground ahead of the excavation face.

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