農路系統總長度佔所有道路系統總長度比例相當高，但建設維護經費卻佔國家建設經費之少數，且農路系統未若高快速道路及機場來的重要，所以農路設計常被工程師忽略，惟現行農路功能卻不只作農業道路使用，常常成為市區道路、鄉道、縣道或省道之連絡或替代道路，有鑑於此，應強調農路柔性鋪面設計觀念的重要性，並以農路最常見之疲勞裂縫及車轍變形為破壞形態，予以評估比較其安全性、經濟性及功能效益再做合適的建議。
本研究首先對新市鄉農路作現況及交通量調查，了解其使用狀況外，再依據現行規範作鋪面力學分析，對鋪面破壞情形詳作具體的預測及現況比較發現，農路瀝青混凝土（A C）面層頂端最大張應變產生於輪胎邊緣，這易造成平行車行方向由上往下的縱向裂縫，而這類型裂縫生成一般較淺層、且未穿透至底部，對鋪面破壞影響相對較小；而農路AC面層最大水平張應變產生在面層底部輪跡下方，形成之裂縫常會由底部反射至頂端，產生由下而上垂直行車方向之橫向裂縫，此類裂縫常貫穿AC面層，對鋪面破壞影響甚巨，且農路AC面層疲勞裂縫會於輪跡範圍交互形成龜殼狀裂縫，當整體疲勞龜裂百分比超越門檻值時道路便損壞。而目前國內農路規範尚未將交通量因素納入設計考量，仍停留在對面層、底層厚度選擇的方式，本研究在考量實際交通量及軟弱路基MR值13,800kPa（2,000psi），應用美國州公路及運輸官員協會AASHTO柔性路面設計法對農路鋪面作設計模擬，得到現行幹道農路所需瀝青面層厚度較現行農路規範厚，而此種方式作柔性路面設計，就現實而言該設計應較為耐久，但以經濟觀點而論又有過於保守之虞，如何取捨便成為工程師設計時考量重點。

The length of agricultural road takes a large percentage of road system, but its maintenance expenditure takes small percentage of budget. Because his position is less important than express way and runway, its design is ignored by engineers. Meanwhile, the agricultural road now is not only used by agricultural road but also becomes urban road, country road or primary road. accordingly, the farm road engineers should emphasize on the design of flexible and pavement because of its fatigue crack and the rut deformation then give a appropriate suggestion after evaluating the safety, economy and functionality.
This project first focuses on the situation of Sinshih Township agricultural roads and the volume of traffic to understand the status of agricultural roads. Second, depending on the Pavement analysis of destroyed agricultural roads, we can find and predict the tension strain of top of Surface Course of AC resulting from the edge of tires. It is less damaging and easy to happen vertical clefts from top to bottom, this kind of clefts happen on superficial level instead of penetrating. The biggest horizontal tension in AC surface of agricultural roads result from the bottom level beneath the tracks. The clefts reject from bottom to top resulting in crabwise chaps and penetrate AC level even to destroy AC surface dramatically. The AC level fatigue clefts are produced by the track-crossing then break if over the Threshold limit value.
Current norms have not taken traffic volume into considerations of farm road instead of the choice of the depth in Course or Base Course. The project considers the real traffic volume and soft Roadbed MR13,800kPa（2,000psi）adapting the stimulation in US state roads and AASHTO for the design of soft Roadbed to get the standard depth of asphalt. This method is durable in reality but it too conservative in economic viewpoint. How to get a even point is an important issues considered by engineers.

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