本研究係針對一般加勁擋土牆，以“改良式多楔形”(Multi-wedge)之擬靜態(Pseudo-static)分析法。進行牆體在地震下之穩定分析，建立各種加勁牆在地震中變位之簡化評估方法。
本研究針對塊石面板(Modular blocks)與剛性面版(Full-height rigid panel)等不同面版加勁擋土牆的耐震行為，進行廣泛之參數分析。引入實際現地常用之各項牆體及土壤參數，如土壤摩擦角、加勁材長度、牆體寬高比、牆體傾斜度等，發現各參數與牆體臨界係數可以線性關係表示，並利用多元迴歸求出關係式，以便實際使用。
以牆體臨界係數關係式，配合Newmark(1965)塊體滑動理論的變位計算，求得特定震波資料下牆體臨界係數與計算變位值之關係。經由比對實際破壞案例，確認本研究所建立地震變位評估方法之可靠性。使工程師在設計加勁擋土牆時能快速預估牆體耐震性並計算可能之變位，有效結合學術研究與現地施作。

Pseudo-static-based multi-wedge analysis is performed to derive the stabilities of geosynthetic-reinforced retaining walls under earthquake. It is shown that the values of critical seismic coefficient (khcr) can be expressed using linear functions of the parameters representing the geometry and the reinforcement configuration of the wall. (e.g. internal friction angle of backfill, length of reinforcement, height of wall, facing slope.) Newmark’s sliding block analysis and the regressive formulas of khcr in the present study are performed to calculate the horizontal seismic displacement of geosynthetic-reinforced retaining structures under specific earthquake. Several example walls are analyzed to verify the approach proposed herein, and good agreements between the calculated and the observed seismic displacements of the walls are obtained.

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