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Optimization the Distance between Piles in Supporting Structure Using Soil Arching Effect Original Article, C57 HosseinianS. and Cheraghi Seifabad M Journal. Civil Eng. Urban. 3(6):386-391. 2013 ABSTRACT:High cost value of traditional methods for stabilization of pit, encouraged the engineers to study more about soil characteristics and its application. Arching effect is one of these characteristics, it allows to designers apply non-continuous structural elements to provide safety and economy of project. To investigate arching effect of retained structure with anchorage method, Plaxis 3D Tunnel software is used to model fine-grain (CL-ML) with hardening soil behaviour which simulate soil material. In first model, the distances between piles are 2m and number of anchors are 5. In second model, the distance between piles are 4m and number of anchors are 3. The numerical modeling results show horizontal arching appearance in distance between piles. A comparison between the results gained from the 3D FE analyses and the more or less conventional method shows that the classical method is very much on the safe side. Keywords:Arching effect; Excavation; Anchorage method; Plaxis 3D Tunnel software منبع: [Hidden Content] دانلود: [Hidden Content].,57-386-391.pdf J. Civil Eng. Urban.,57-386-391.pdf