本研究利用二維數值分析軟體UDEC模擬岩坡破壞，第一部份針對含一組規則節理岩坡之傾倒與順向滑動破壞，探討其漸進式之坍滑發展過程與力學行為，第二部份將前述兩種型態之邊坡結合來模擬山谷地形，並探討山谷兩側邊坡三種不同間距(W=∞、25、100m)之交互影響，再依據數值模擬運算，就山谷兩側邊坡整體之破壞發展歷程、主應力分佈、位移變化等進行分析與對比探討。
研究結果顯示山谷兩側邊坡於三種不同間距變化所引致之交互影響，不論是對山谷之傾倒邊坡側或是順向邊坡側，對於谷底底面以上邊坡而言，應力有最明顯差異之處為接近坡趾區域，而且呈現σ(W∞)> σ(W100)> σ(W25)之趨勢，而對於山谷底面下方之地底應力，則會受山谷兩側岩坡自重之壓力傳播而在底面下方某一深度處產生重疊，同時山谷兩側之岩坡坡趾區域之應力會受對向岩坡之應力傳遞影響而產生束制折減。

This paper studies the slope failure mechanism by using the two-dimensional simulation program, UDEC. The first part focus on the toppling and plane failure modes of rock slope with one set of regular joints. The process of progressive failure development and mechanic behavior are analyzed. The second part combines the toppling and dip slope to imitate a valley. The reciprocal effect between these two slopes is investigated. Three different distance between slopes was chosen as (W = ∞、100、25m). By comparisons can help understand how it affects the failure mechanism, stress distribution and displacement both toppling and dip slope.
The analytic results show the interaction tendencies of two slopes under three different distance between slopes. For the slopes above the bottom of valley, whether the toppling side or dip slope side, the magnificent stress concentration happens near the toe of slopes, it shows magnitude tendency of the principle stress near toe is σ(W∞)> σ(W100)> σ(W25).On the other side, the stress below the bottom of valley will overlap somewhere deep down because of the body weight of slopes. Meanwhile, the stress of the toe of slopes will reduce because of the convey-effect of opposite slope .

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