本研究以三維時間域、非線性之有效應力有限元素動力分析程 式，就地中連續壁降低土壤液化潛能之有效性進行初步探討。首先探 討了地震輸入維度、輸入地震的強度以及邊界條件對土壤受震反應的 影響，而後根據連續壁之勁度、埋置深度的參數變化探討連續壁防治 土壤液化的有效性。研究結果顯示，三維問題的研究應使用三維的地 震輸入比較適合，且輸入地震之加速度峰值越大，孔隙水壓上升的速 率也越快。採用連續壁可以延緩孔隙水壓到達最大值的時間，靠近連 續壁之土壤因受拘束作用而抑制了孔隙水壓之上升量，但距離較遠處 其效果遞減。根據此一初步之研究，只要設計得宜，連續壁不但可以 防止土壤液化，而且也可以降低地表沉陷量。 In this thesis, a 3D finite element method is applied to investigate the effectiveness of diaphragm wall in reducing the potential of soil liquefaction induced by earthquakes in time domain. The influence of the dimension of input motion, and the intensity of input motion, on the obtained results is investigated first, and then the effectiveness of diaphragm wall in reducing the liquefaction potential is studied by varying the young’s modulus and embedment depth of wall. It was found that in three dimension analysis, the 3D input motion should be used, and the larger input motion is the faster the excess pore pressure is generated. It also found that with appropriate design, the diaphragm wall can be effective in preventing liquefaction, and reducing settlement.
