為使無鋪面加勁道路試驗模型能夠在實驗室於良好之控制條件下進行試驗，如何決定試驗箱體與載重範圍間之比例關係則為首要條件，本研究以標準胎壓480kPa及等值矩形胎印面為基準將模型以等比例放大，並與無加勁之無鋪面路基進行分析比較，結果顯示模型之尺寸對於加勁材之驅動張力產生影響，而隨著模型尺寸之增大對於加勁材所激發之張力其影響程度則趨於減小。當底部邊界深度大於12.5倍之等值矩形胎印面長邊且模型面積Am與等值矩形胎印面積At之比例係數為155時，因邊界影響而產生之額外應力增量與加勁材驅動張力皆有明顯收斂之趨勢。

It is essential for an unpaved reinforced road model to be tested under controlled environmental conditions. Therefore, the first priority is to find out how to determine the proportional relationship between the test model and the load range. Our study uses the standard tire pressure 480kPa and equivalent rectangular area as a benchmark model. To draw a comparison with unreinforced unpaved roads enlarge the model proportionally. Our comparative analysis indicates that the size of the model has significant influence on the mobilized tension of the reinforced material. The bigger the model size is, the less the mobilized tension of reinforced material is. Moreover, both additional stress increment caused by the boundary and mobilized tension of reinforced material evidently converge when (1) the depth of the bottom boundary is more than 12.5 times the length of the long side of the equivalent rectangular tread printing surface area, and (2) the proportional coefficient between Am, the surface area of the model, and At, the equivalent rectangular tire print area, is 155.

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