反覆載重下鋪面之車轍損傷評估

Damage assessment for pavement under repeated loads

李奇瑋(Chi-Wei Li)

指導教授 ： 張瑞宏

國立中央大學/工學院/土木工程學系/碩士(2007年)

摘要

台灣道路一般以柔性鋪面為主，由材料試驗可知，回彈模數會受到反覆載重的影響，因此本研究採用三維有限元素法來探討柔性鋪面承受反覆載重作用下，鋪面的車轍與疲勞之損傷評估。研究中考慮覆土應力、不同胎壓、軸重與含水量，利用材料試體試驗所得之回彈模數值，配合 AASHTO 2002 鋪面成效回歸式來評估其受反覆載重後，鋪面損傷程度。
研究結果顯示，在鋪面結構分析的部份，路基土壤含水量增加時，對鋪面結構的影響也相對增加；在軸重、胎壓與含水量同時增加的情況下，對鋪面之影響，會比單一增加下影響來的大。在鋪面損傷分析的部份，鋪面的損傷會隨著反覆載重次數、胎壓、軸重及路基土壤含水量的增加而增加。

關鍵字

三維有限元素法 ； 車轍 ； 疲勞開裂 ； 反覆載重 ； 永久變位

並列摘要

Flexible pavement under repeated loads is an important factor in design pavements. According to material experiments, resilient modulus is affected by repeated traffic loads. In this study, a series of three-dimensional finite element analyses is performed to study the damage of pavement caused by rutting and fatigue, with the pavement subjected to repeated loads. The damage of pavement is evaluated by considering various wheel loads, various inflation pressures, moisture content in soil, the body force of pavement, resilient modulus obtained from the material experiments, and AASHTO 2002 Design Guide.
The results indicate that the more moisture the subgrade soil possesses, the larger influence the pavement structure is affected. The effect of pavement is larger when wheel load and inflation pressure increase at the same time. The damage of pavement increases while repeated loading, wheel loads, inflation pressures, and moisture contents in subgrade soils increase.

並列關鍵字

repeated loading ； three-dimensional finite element ； permanent deformation ； fatigue cracking ； rutting

參考文獻

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