Performance of embankments with rigid columns embedded in an inclined underlying stratum: centrifuge and numerical modelling |
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Authors: | Zhou Haizuo Zheng Gang Liu Jifu Yu Xiaoxuan Yang Xinyu Zhang Tianqi |
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Institution: | 1.School of Civil Engineering, Tianjin University, Tianjin, 300072, China ;2.Key Laboratory of Coast Civil Structure Safety, Tianjin University, Ministry of Education, Tianjin, 300072, China ;3.State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China ;4.CRCC Harbour and Channel Engineering Group Co, LTD, Zhuhai, 519000, China ; |
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Abstract: | Rigid columns penetrating a firm underlying stratum have often been used to enhance the stability and improve the settlement of embankments over soft ground. Furthermore, an inclined underlying stratum is commonly encountered in engineering practice. This investigation experimentally and numerically studies the performance of embankments over soft ground reinforced by rigid columns with various embedment depths. In centrifuge tests, a tilting failure occurs for columns with an embedment depth Le of 2D (D is the diameter of columns), whereas the embankments remain stable for Le of 7D. This result indicates that the inclined underlying stratum weakens the restraint effect at the column base and that a greater embedment depth is required to ensure the stability of embankments. Parametric studies numerically reveal that there exists a critical embedment depth, which represents a shift in the failure mechanism. The optimum column layout is determined based on the contributions of columns in different locations beneath an embankment. Finally, the influence of the embedment depth on the distribution of the bending moment of the columns and the soil reaction are discussed. |
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