我國為地狹人稠的海島型國家，於可開發面積有限的情況下，人們考慮以開發地下空間來因應面積不足的問題，例如：鐵公路地下化等相關開發計畫。然而，好的開發計畫可以帶給人們生活便利，相反的，施工不當所導致的工程問題，將對人民生命財產造成威脅，因此，若能於地下空間開發初期，針對開發行為可能導致的地表沉陷問題進行有效的模擬評估，可減少工程災害對人民的影響。
因此，本研究主要目的是希望透過落門試驗(Trapdoor Test)探討水平節理岩盤開挖之變形行為，其試驗主要分為單孔隧道開挖模擬與雙孔隧道開挖模擬兩個部份，並針對其開挖過程所引致的地盤最大沉陷量和影響範圍、拱效應影響區及開挖區周圍岩體之變形行為等進行分析及探討。
研究結果發現，本研究所使用之變形攝影測量技術其精度可達0.1mm，已達本研究之需求。且於單、雙落門試驗結果均發現，隨著隧道覆土層厚度增加，地盤拱效應能完整發揮，使其對地表影響隨之減少。而當兩隧道開挖間距小於1.0D時，新隧道開挖易對現有隧道周圍地盤造成影響；相反的，當其間距大於1.0D時，則無互相影響的情形。
將數值分析結果與本研究落門試驗結果比較發現，有限元素法分析軟體Phase2分析結果較與試驗結果相近，而不連續位移分析法DDA因參數僅作初步假設，故其應用於本研究有稍微高估地表沉陷影響範圍，未來若能經修正再進行模擬，將更顯完善。

Taiwan is densely populated and congested environment of the island country. In the circumstance of the limited development area, people consider to develop underground space in response to the problem of inadequate space, such as: rail road underground, and other relevant development plan. However, the good development plan can promote people's lives more convenient. On the contrary, because of improper construction caused by engineering problems will pose a threat to people's lives and property. The excavation in the early development of underground space could lead to surface settlement problems. Therefore, the effective evaluation of the simulation can minimize the impact of disasters on the people.
This study presents the trapdoor test to discuss the deformed behavior in the horizontal joint of the rock excavation. Two parts of this test are divided the single-hole and double-hole simulations of the tunnel excavation, respectively, to analyze the mechanical behaviors, i.e. the maximum settlement and affected area in the process of excavation, the deformation around the arching effect and excavation of the rock mass.
The results showed that the use of the deformation of the Institute for Photogrammetry its technical accuracy of 0.1 mm, this study has reached the demand. And in single-and double-door test results were found, along with increased thickness of the tunnel casing, the site arch effect can play a full, to be reduced impact on the surface. When the two tunnel excavation spacing of less than 1.0 D, the new tunnel to the existing tunnel-digging around the impact site; On the contrary, when the pitch is greater than 1.0 D, the situation is not affecting each other.

The numerical analysis of the results of this study and drop-door test results found that finite element analysis software Phase2 analysis and test results than similar, but not continuous displacement analysis by DDA Preliminary parameters for only assume that it applied to this study are slightly Overestimated the extent of surface subsidence, as amended, the future if further simulation, will be even more perfect.

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