本研究針對加勁擋土牆對於地震後的位移變化，藉由歷史試驗數據蒐集及單位處理，共10份文獻81個樣本進行5組迴歸分析。選用自變數J:加勁材勁度，L/H: (加勁材長度)/(模型牆高)，Sv/H: (加勁材間隔)/(模型牆高)、γ: 回填材料單位重、f: 振動頻率、amax: 尖峰加速度、tanφ: 回填材料內摩擦角的正切值，應變數△x/H: (估計頂部位移)/(模型牆高)。第1~3組分析中，發現第72個樣本實際△x/H為異常數據，以及J與γ的β(表示該自變數每增加1單位，估計△x/H的平均變動量)為當中最小值，故在分析中移除。第3組分析結果調整後R2及F值皆提升，證明移除J、γ後其迴歸公式更具顯著性，與其他學者對於J的試驗結果相同。
4~5組探討更具代表性的回填材料參數tanφ，因蒐集的樣本中僅有55個樣本有列出此條件，因此以第3組自變數保留55個樣本進行第4組分析，再加入tanφ進行第5組分析進行比較。第5組的調整後R2=0.706及F值=24.4相較第4組無提升，但tanφ的β較f的β絕對值高，顯示tanφ對估計△x/H有更顯著影響。第5組分析結果，β最高的自變數為Sv/H，β次高的自變數為amax。

This study discuss the top displacement of geosynthetic-reinforced walls after the earthquake. Based on 81 historical test data from 10 studies and unit processing, 5 groups of regression analysis were performed. Selected independent variable J: stiffness of reinforcement, L/H: (length of reinforcement)/(model wall height), Sv/H: (vertical spacing of reinforcement was placed)/(model wall height), γ: unit weight of backfill material, f : shaking frequency, amax: peak acceleration, tanφ: tangent value of the internal friction angle of the backfill material, and dependent variable △x/H: (estimated top displacement)/(model wall height).
In the analysis of the 1st to 3rd groups, it is found that the actual △x/H of 1 sample is abnormal, and the β(the independent variable increases by 1 unit, the average change of estimated△x/H) of J and γ are small and removed from the analysis. After the the 3rd group of analysis, the adjusted R2 increases, which proves that J and γ are helpless for estimating △x/H.
The independent variables of the 3rd group are used for the 4th group analysis with 55 samples listed the backfill material parameter tanφ, and then add tanφ analysis to the 5th group for comparison. The adjusted R2 of the 5th group is 0.706 and the β of tanφ was higher than the absolute value of β of f, indicating that tanφ had a more significant effect on the estimated △x/H. After the 5th group of analysis, the independent variable with the highest β is Sv/H, and followed by amax.

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