@article{oai:soar-ir.repo.nii.ac.jp:00011144,
 author = {辰野,  良秋 and 堀内,  照夫},
 journal = {信州大学農学部学術報告},
 month = {Apr},
 note = {It is a most important thing to construct a good forest road for the purpose of developing the natural resources of a virgin forest as well as of increasing the reproduction of the forest resources. Now the question in hand which is essential to the present purpose is to construct a road with a stabilized surface and then to maintain by all possible means its surface stable when once consturcted. The way will be as follows. 1. There may be many measures to be taken for the stabilization of a forest road, but it is necessary, in the first place, to make clear the properties of the structural material, i.e., soil, of the road surface, and then in accordance with then of construct the road and deal with its surface. In this subject we investigated the soil properties of the roads respectively in the regions of Palaeozoic, Granite (weathring), Crystalline Schist, and Fantalus (originating in Crystalline Schist and Gneiss.) The results were as shown in Table I to VII. 2. The soil grain textures originating in these different regions are very complicated and only few are the ideal ones. Though it is almost impossible to change natural textures into ideal ones, we ought to do as much as we can to approach to the ideal. We know the fact that among the rest the existence of very big stones loses the roads value very much so the work to eliminate the obstacle in the way is necessary, any how, and it is one of the measures that we are able to do for the security of the foundation and the stabilization of the roads surface. (In India Rutways or Trackways has been used as a economic measure.) 3. Soil properties-grain texture, plastic limit and plastic index etc.-show unstability against precipitation to a considerable extent. Soil becomes to be more flowing in proportion to the moisture content in soil. Therefore, in order to secure the roads surface, we must take some precaution steps against precipitation, such as drainage, reinforcement of road's edge, and stabilization of banking's slope. 4. Optimum moisture content which is known by compaction test in order to obtain maximum dry density is higher than the moisture content of natural soils. So we can not fully expect the effect of compaction, if the operation above described are carried out on the natural soils as they are. 5. We must note that it is a matter of no uncommon occurrence that mountainous disasters are caused in traces of forest road construction. This is a problem which requires another consideration., Article, 信州大学農学部学術報告 5: 7-19(1956)},
 pages = {7--19},
 title = {林道路面の安定性について},
 volume = {5},
 year = {1956}
}