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| Modified 3D finite element model of simplified PVDs as surface or line under vacuum preloading considering smearing effect |
| ZHU Guangchao, XU Zengguang*, CAO Cheng, CHAI Junrui, GENG Kaiqiang |
| State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi′an University of Technology, Xi′an, Shannxi 710048, China |
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Abstract In order to solve the problems that the traditional vacuum preloading three-dimensional(3D)finite element model(FEM)is difficult to establish and divide the elements, the calculation amount is huge, and the large ratio of width to height of the prefabricated vertical drains(PVDs)affects the calculation accuracy, based on the idea of drainage substructure, two modified 3D FEMs of simplified PVDs as surface or line were proposed and verified. The simplified PVDs single-drain 3D FEMs were extended to multi-drain 3D FEMs, and numerical simulation were carried out in combination with an engineering example, which were compared with the measured data, the two-dimensional(2D)sand wall equivalent method and the traditional 3D FEM. The results show that the modified 3D FEMs of simplified PVDs as surface or line simplify the pore pressure transfer form into a rectangle, which are different from the circular pore pressure transfer form of the traditional vacuum preloading 3D FEM. The simplified PVDs 3D FEMs are closer to the measured data than the 2D sand wall equivalent method, and the calculation accuracy is close to the traditional 3D FEM, which can meet the enginee-ring requirements. The simplified PVDs 3D FEMs with drainage substructure can effectively reduce the difficulty of 3D FEM establishment and division. Simplifying PVDs into drainage surface or drainage line can effectively solve the problem that the unit width to height ratio is too large due to the small size of PVD, and can effectively reduce the number of elements in 3D FEM and improve the calculation efficiency. 〓
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Received: 21 November 2022
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