本研究利用Lee（2000）的複合材料觀念及Boyle（1995）所進行UCD（Unit Cell Device）試驗的結果，發展出一系列在平面應變下，GRS（Geosynthetic-Reinforced Soil）及土壤之彈性模數，同時以二維有限差分法程式FLAC（Fast Lagrangian Analysis of Continua）建立加勁擋土牆之複合材料數值模型，分析建造完成後之應力應變行為，並與現地實體擋土牆量測到之變位與應變，進行比較討論。
本文以美國華盛頓州Rainier Avenue wall做為數值分析模型，該加勁擋土牆採用回包式牆面，設計高度為12.6公尺，加勁材埋置長度為9.5公尺。並於牆後3公尺處裝置傾斜計（Inclinometer）與加勁材上之應變計，取得牆體隨深度變化之水平變位與加勁材應變之實測值。複合模型以0.5%、1.0%及2.0%三種不同側向應變條件下，分析觀測牆後3公尺之應力應變變化，以便與實測值比較分析。
研究成果顯示，利用FLAC 有限差分程式配合複合材料模型，分析加勁擋土牆之牆體變位及應變，可得到與實測值良好之一致性。加勁擋土牆之h/H小於0.38時，以0.5%側向應變模型較接近實測值，而h/H介於0.38到0.48時，則實測值與1.0%側向應變模型相近，h/H大於0.48時，則以2.0%側向應變模擬，可獲得較合理之預測。

Based on the concept of composite material for the GRS (Geosynthetic-Reinforced Soil) retaining wall (Lee, 2000), this study developed a series of elastic moduli in plain strain using the UCD（Unit Cell Device）testing results from Boyle（1995）. Subsequently, the finite difference method of FLAC（Fast Lagrangian Analysis of Continua）was utilized to build the composite material model of GRS retaining wall and to analyze its stress-strain behavior after construction. A comparison was therefore made and discussed between the analyzed results and the field measurements.
The Rainier Avenue Wall of GRS retaining wall built in Washington State in US was adopted as the simulated object. The wrapped-around facing was adopted for the 12.6m-heighted wall with the 9.5m-lengthed reinforcements embedded in a vertical spacing of 0.38m. The field measurement of the inclinometer and the strain gage on the reinforcements at a distance of 3m behind the wall facing were collected for the comparison with the simulation results as of different lateral strain condition in 0.5%, 1.0%, 2.0% of the composite models.
It is found that the performance of the composite material model using FLAC reveals its consistency with the field measurement. The horizontal displacement of the GRS wall was related to the height ratio h/H of the height in concern. When h/H less than 0.38, 0.5% of lateral strain model is suitable, while 0.38〈h/H〈0.48, the deformation is close to the 1.0% model. As for h/H greater than 0.48, the model of 2.0% in lateral strain would be appropriate for the simulation and prediction.

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