本研究透過有限元素法PLAXIS對回包式及剛性牆面加勁擋土牆進行動態分析。首先，以縮尺度加勁擋土牆模型驗證土體參數轉換、材料邊界及邊界條件等設定，獲得良好結果；再設計高為3 m、長為5.65 m、五層加勁層之全尺度回包式及剛性牆面加勁擋土牆以最大地表加速度 0.1 g - 0.5 g 與加載頻率 3 Hz - 9Hz 組成共 20 組具有不同震動特徵之簡諧波，加上集集地震與阪神地震兩組真實地動訊號作為全尺度模型之動態加載條件，以探討不同地震特徵與加勁擋土牆受震之動態行為的影響。研究發現，剛性牆面加勁擋土牆在低頻率(3 Hz)簡諧震動波加載下，加速度放大係數(A_rms)能體現與加載能量的遞增有正比關係；加勁擋土牆在兩組真實地震波加載下也都能明顯體現加速度放大效應，且與高程或加載能量的遞增有正比關係。在兩組真實地震波模擬中，回包式牆面與剛性牆面沒有按照最大地表加速度增加而出現相應之位移增加，認為原因在於牆面系統的整體剛度反應出不同的牆面位移分布，且真實地震波之加速度會隨時間變化，造成單純以最大地表加速度估計加勁擋土牆之動態反應可能造成錯估；加勁擋土牆之牆面變形及位移則與每層加勁材之最大應變趨勢相似，認為是與加勁材與土體之互制作用有關。所有模擬組之加勁材最大應變亦在5 %以下，認為在本研究之數值模型條件下，加勁材都有足夠之剛度應付具有不同震動條件之動態加載而不致破壞。

This paper presents dynamic effects on numerical models of geosynthetic reinforced walls considering wrapped or rigid faces, using a Finite-element approach. Development of the numerical models for simulating the published results on seismic responses are firstly presented. Then, it is scaled up to a size of 3 m high and 5.65 m long geosynthetic reinforced wall models with both wrapped and rigid faces. 0.1g to 0.5g sinusoidal waves with frequency from 3 Hz, 5 Hz, 7 Hz, 9 Hz, and the Chi-chi earthquake from Taiwan and the Kobe earthquake from Japan, are applied. The results show that for the rigid faced reinforced wall models, the acceleration (A_rms) amplifications increase with increasing of seismic energy under low frequency (3 Hz) sinusoidal waves. All of the models show that the acceleration amplifications increase with the increasing of seismic energy under real earthquakes. There are different tendencies between the results of wrapped and/or rigid face walls according to the two real earthquakes. There are similar tendencies between wall face deformations and maximum reinforcement strains because of the interaction between the soil and reinforcement. All of the maximum of reinforcement strain obtained by the models are lower than 5 %. It is found that the reinforcements are stiffness enough to handle any situations in study.

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