1999年9月21日發生的集集大地震規模高達芮氏規模7.3，誘發了草嶺大規模地滑，面對如此大型的崩塌時，劃定可能影響範圍等軟性防災對策是相對經濟的一種方法。Discontinuous Deformation Analysis (DDA) 可以準確描述崩塌邊坡幾何形狀與不連續面的分布以及塊體間的接觸判定計算，具有模擬邊坡破壞行為的優勢，將其使用在模擬大型崩塌的影響範圍勢必是一值得探討的課題。
經過震動台試驗驗證DDA在地震邊坡模擬的可行性，本研究主要利用DDA分析草嶺在集集地震中破壞的行為。經過針對草嶺邊坡進行剖面圖繪製、加速度歷時曲線之基線修正以及岩石性質室內試驗與利用Newmark sliding model反算滑動面抗剪強度後，更進行不同的凝聚力以及內摩擦角的組合下的敏感度分析，模擬結果顯示內摩擦角對於破壞模擬結果影響較大。另外，低摩擦角的模擬結果與現地崩塌後地形十分吻合，其塊體的行為也支持草嶺崩塌的氣墊說。

On September 21, 1999, a violent earthquake of ML=7.3 which is named to be the Chi-Chi Earthquake attacked Taiwan. The Tsaoling landslide is one of the gigantic rock avalanches triggered by the earthquake. In such huge avalanche, the precaution or preparedness against natural calamities of comparting the possible affected area are relatively economical strategy. The discrete numerical analysis method, Discontinuous Deformation Analysis (DDA), explicitly involves the slope landform and joints, as well as detecting the contact among blocks. Therefore, DDA is expected to be a useful tool to simulate the behavior of rock avalanches.
After comparing the shaking table test with the DDA analysis result to validate the applicability of using DDA on seismic slope analysis. The major objective of this study is focus on investgating the Tsaoing landslide behavior during the Chi-Chi earthquake, through profile mapping, baseline correction of acceleration, laboratory test on local rocks and back-analysis of shear strengths of the failure surface by Newmark sliding model. In addition, DDA is applied to simulate the Tsaoling landslide under different cohesions and internal friction angles. The analysis results show that the change of internal friction angle influences the deposited landform more significantly than the change of cohesion. Furthermore, the simulation results with low internal friction angle simulate the post-failure landform well and support the air cushion hypothesis.

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