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논문 기본 정보

자료유형
학술저널
저자정보
Zheng, Gang (MOE Key Laboratory of Coast Civil Structure Safety, Tianjin University) Nie, Dongqing (MOE Key Laboratory of Coast Civil Structure Safety, Tianjin University) Diao, Yu (MOE Key Laboratory of Coast Civil Structure Safety, Tianjin University) Liu, Jie (MOE Key Laboratory of Coast Civil Structure Safety, Tianjin University) Cheng, Xuesong (MOE Key Laboratory of Coast Civil Structure Safety, Tianjin University)
저널정보
테크노프레스 Geomechanics & engineering Geomechanics & engineering 제13권 제5호
발행연도
2017.1
수록면
715 - 742 (28page)

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Earth berms are often left in place to support retaining walls or piles in order to eliminate horizontal struts in excavations of soft soil areas. However, if the excavation depth is relatively large, an earth berm-supported retaining system may not be applicable and could be replaced by a multi-bench retaining system. However, studies on multi-bench retaining systems are limited. The goal of this investigation is to study the deformation characteristics, internal forces and interaction mechanisms of the retaining structures in a multi-bench retaining system and the failure modes of this retaining system. Therefore, a series of model tests of a two-bench retaining system was designed and conducted, and corresponding finite difference simulations were developed to back-analyze the model tests and for further analysis. The tests and numerical results show that the distance between the two rows of retaining piles (bench width) and their embedded lengths can significantly influence the relative movement between the piles; this relative movement determines the horizontal stress distribution in the soil between the two rows of piles (i.e., the bench zone) and thus determines the bending moments in the retaining piles. As the bench width increases, the deformations and bending moments in the retaining piles decrease, while the excavation stability increases. If the second retaining piles are longer than a certain length, they will experience a larger bending moment than the first retaining piles and become the primary retaining structure. In addition, for varying bench widths, the slip surface formation differs, and the failure modes of two-bench retained excavations can be divided into three types: integrated failure, interactive failure and disconnected failure.

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