Turkey is not possible in the existing forest roads with very little of the superstructure and the remaining majority uncoated and transport of wood raw material in an expeditious manner in all seasons due to the unfounded nature of the soil in the road. For this reason, the application of forest roads in all forest areas rapidly and to the construction technique The necessity of choosing the materials and thickness of the three layers mentioned above on the forest roads, in other words, the most important issue of the superstructure.Forest roads show some differences compared to other engineering structures. Due to the length of the roads, the floor of the superstructure can vary from point to point. The superstructure is made of different materials. For this reason, superstructure design is one of the most complex subjects of engineering. Computer programs play an important role in speed, precision and time in engineering calculations. AASHTO 1986 flexible superstructure can be obtained by SN trial-error due to the excess of parameters in the calculation formula and the mathematical complexity of the formula. The aim of this study is to develop a fuzzy logic model related to AASHTO 1986 flexible pavement calculation method which is one of the methods used in designing flexible pavements.  With this model, the formula results can be highly predicted. Fuzzy logic method can be used as an important tool for researchers and practitioners working in forest road engineering.

Keywords - Forest road, pavement, Fuzzy logic

[1]. Erdaş, O., Orman Yolları, KTÜ, Orman Fakültesi, Yayın No: 26, Cilt II, Trabzon.1997.
[2]. Aykut, T., Kastamonu Mıntıkası Orman Yollarında Üstyapı Tekniği Üzerine Araştırmalar, İ. Ü., Orman Fakültesi Yayın no:238, 119s., İstanbul, 1978.
[3]. Carnahan, J. V., Davis, W. J., Shahin, M. Y., Keane, P. L., Wu, M. I., Optimal maintenance decisions for pavement management, ASCE Journal of Transportation Engineering, Vol. 113, No. 5, pp. 554-572.1986.
[4]. Juang, H. C., Amirkhanian, S. N., Unified pavement distress index for managing flexible pavements, ASCE Journal of Transportation Engineering, Vol. 118, No. 5, pp. 686-699.1992.
[5]. Asmarandei, M. ve Cazan, I., Building and Maintenance of Forest Roads-Technologies and Equipment, Proceedings of the Seminar on Envirobmentally Sound Roads and Wood Transport, Sinaia, Romania, s.291-300, 1996.
[6]. Spaeth, R., Environmentally Sound Forest Road Construction in Nordrhein-Westfalen (NRW) Germany, Proceedings of the Seminar on Environmentally Sound Roads and Wood Transport, Sinaia, Romania, s.109-117, 1996.
[7]. Cheng, H. D., Chen, JR., Glazier, C., Hu, Y. G., Novel approach to pavement cracking based on fuzzy set theory, Journal of Computing in Civil Engineering, Vol. 12, No. 4, pp. 270-280.1999.
[8]. Saitoh, M., Fukuda, T., Modeling an Asphalt Pavement Repair System Considering Fuzziness of Budget Constraints, Computer-Aided Civil and Infrastructure Engineering, Blackwell Publishers, Vol 15, pp 39-44, USA.2000.
[9]. Kulkarni, R.B., Miller, R.W., Pavement Management Systems: Past, Present, and Future, 2000 Midwestern Pavement Management Conference, Kansas,2000.
[10]. Terzi, S., Bitum Miktarının Asfalt Betonu Dayanımına Etkisinin Bulanık Mantık Yontemi İle Modellenmesi, Uluslararası Gelismis Teknolojiler Sempozyumu, Konya.2005.
[11]. Karacasu, M., Yayla N.,Kentici Otobus Tasımacılığında Ozellestirme İcin BirKarar Destek Modeli Onerisi, itudergisi, 3(6), 59-70, İstanbul.2004.
[12]. Porter, O. J., Development of the Original Method for Highway Design, Symposium on Development of CBR Flexible Pavement Design Methods for Airfields, Transachan, ASCE, pp. 461-467.1950.
[13]. 6. AASHTO, Guide for Design of Pavement Structures, 1986.
[14]. Şen, Z., Mühendislikte bulanık (fuzzy) mantık ile modelleme prensipleri, Su Vakfı Yayınları, İstanbul, ss:191.2004.
[15]. Şen, Z., Fuzzy algorithm for estimation of solar irradiation from sunshine duration. Solar Energy Vol:63, Num:1, pp:39-49. 1998.
[16]. Özdemir, İ., Aytekin, O. ve Kuşan, H., Şerefiye Bedelinin Bulanık Mantık Yaklaşımı İle Hesaplanması, 4.İnşaat Yönetimi Kongresi, İstanbul, ss:181-190.2007.