近年來國內各項建設發展迅速，砂石需求殷切。而大規模的人為開發與不當削切邊坡，加上台灣地區天然災害不斷，每逢颱風或地震後，往往造成大量土石崩落堆積在河谷之間。本試驗利用當地風化崩壞之岩屑作為傳統公路之底層，並利用高抗張強度地工織布加勁，模擬無鋪面道路經輪胎底面(荷重強度為500kPa)之10000次反覆載重試驗，討論與分析底層表面沉陷，加載後特定區域之粒徑分佈情形，以及地工織布在加載過程中的應變變化。比較其與傳統標準碎石級配層之差異，並探討其替代的可行性。
試驗結果以小林村表面沉陷量最大，車轍四周隆起現象最為明顯，且底層粒料壓碎情形也最為明顯，相較之下承載力明顯不足，並不適用於道路之底層；而阿里山碎石級配表面沉陷量最小，車轍四周隆起現象最不明顯，壓碎程度僅次於標準碎石級配，單從反覆荷重的觀點，使用於傳統道路之底層，是可行的。

Hard rock fragments are conventionally used as the standard base course of highway. In remote areas, the use of standard base course material may be of negative environmental impact. Therefore, the feasibility of using local weak rock fragments as the base course of highway in remote areas is important .In this study, we use two local fragments from Xiao-Lin village (weak shale), Chu-Kou village (hard shale), and a standard crushed stones as the base course of model grounds. A rigid foundation and a servo-controlled facility were used to simulate the tire load on unpaved roads. All model grounds were subjected to a footing pressure of 500 kPa with 10,000 cycles of loading. Two layers of geotextile reinforcement were introduced in some of the tests to investigate the effects of reinforcement for the base course. Test results showed that the use of crushed hard shale as an alternative base course is feasible, in the sense that the model ground, unreinforced or reinforced, with hard shales as the base course exhibited the smallest footing settlement (rutting) and ground heaving at the completion of 10,000 cycles of loading, among the three types of material used. The use of geotextile reinforcement benefited, in terms of less heaving and sand intrusion, but not in reducing the depth of rutting.

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