Application of ground spring model in excavation supported by deep cement mixing
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Author list: Waichita S., Jongpradist P., Submaneewong C.
Publication year: 2017
Journal: International Journal of GEOMATE (2186-2982)
Volume number: 12
Issue number: 31
Start page: 30
End page: 36
Number of pages: 7
ISSN: 2186-2982
Languages: English-Great Britain (EN-GB)
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Abstract
An application of Deep Cement Mixing (DCM) as a retention system in deep excavation becomes gradually popular in very dense population areas because of less noise and environmental impact of the construction process than other systems. In addition, this new kind of retention system has various forms of utilization, which depend on the designer's experience and considerations. For better understanding of this system, full scaled test, down scaled physical model test, and numerical analysis are required to tackle the interested problem. To effectively discuss the behaviors observed from the full-scale numerical analysis and physical model test, the scaling factor must be seriously considered. However, it is difficult to scale down the properties of soft clay in the physical model test. Therefore, the soil and its lateral pressure transferred to the wall are modeled as a series of springs and lateral forces in the model, respectively. To ensure the effectiveness of this modeling, preliminary evaluation is necessary. In this study, a 2D plane strain Finite Element model of an excavation with the DCM retaining wall had been validated with field monitoring data, then the 2D model was compared to a 3D Finite Element model with a series of ground springs to take the lateral stiffness of the in-situ soil behind the wall into consideration. The results of this numerical investigation reveal that the ground spring model has sufficient accuracy to represent the lateral soil-structure interaction. ฉ Int. J. of GEOMATE. All rights reserved.
Keywords
Ground spring model, Retention system
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