Numerical investigation of the performance of micropiled rafts in sand |
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| Institution: | 1. Civil Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia;2. Western University, 1151 Richmond Street, London, ON N6A 5B9, Canada;3. Department of Civil and Environmental Engineering, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 5B9, Canada;4. Department of Civil and Resource Engineering, Dalhousie University, 1360 Barrington Street, Halifax, NS B3H 4R2, Canada;1. Department of Geotechnics and Underground Buildings, Faculty of Civil Engineering, V?B-Technical University of Ostrava 70833, Czech republic;2. Arcadis Inc., 28. Rijna 2663, Ostrava, 70833 Czech republic;3. Orica Inc., Lihovarská 1189/10, Ostrava, 70833 Czech republic;1. School of Infrastructure, Indian Institute of Technology Bhubaneswar, Samantapuri, Bhubaneswar 751013, Odisha, India;2. National Institute of Technology Agartala, Jirania 799055, Tripura (W), India;1. Department of Civil Engineering, Faculty of Engineering, University of Guilan, Rasht, Guilan, Iran;2. Faculty of Engineering, Islamic Azad University of Zanjan, Zanjan, Iran;3. Faculty of Civil Engineering, Vilnius Gediminas Technical University, Sauletekio al. 11, LT-10223 Vilnius, Lithuania;1. Department of Civil Engineering, Faculty of Engineering, Sherbrooke University, Sherbrooke, QC, Canada;2. Department of Civil Engineering, Faculty of Engineering, Assiut University, Assiut, Egypt;1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;2. Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China;3. School of Civil Engineering and Architecture, Zhongyuan University of Technology, Zhengzhou 450007, China;4. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;5. Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China |
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| Abstract: | The micropiled raft (MPR) offers an efficient foundation system that combines the advantages of micropiles and piled rafts that can be used as primary foundation system or to enhance an existing raft foundation. In this paper, a calibrated and verified finite element model (FEM) with centrifuge tests was used to carry out a numerical investigation on the performance of MPR in sand. A total of 78 different cases were analyzed in this study to assess the behavior of MPR in sand taking into account a number of factors that may influence its behavior such as: the number of micropiles (MPs), the spacing to micropile diameter (S/Dmp), the raft thickness, type of loading and soil density. The outcomes of this investigation should help in understanding the effect of these factors on the MPR axial stiffness, including; differential settlement; load sharing between the MPs and the raft; and the raft bending moment. Moreover, the ability of the PDR method to evaluate the axial stiffness of a MPR for the preliminary design stage is examined. It was found that the MPR system has the ability to increase the tolerable bearing pressure by 190% compared to an isolated raft system. In addition, an adjustment factor (ωPR) for PDR method was introduced to account for the raft flexibility. |
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| Keywords: | Micropiled raft Calibrated FEM Load sharing Sand Adjustment factor Poulos–Davis–Randolph (PDR) |
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