Influence of stone column installation on settlement reduction |
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| Institution: | 1. Department of Ground Engineering and Materials Science, University of Cantabria, Santander, Spain;2. Department of Civil and Environmental Engineering, Chalmers University of Technology, Gothenburg, Sweden;3. School of Engineering, Aalto University, Espoo, Finland;4. Computational Geomechanics Division, Norwegian Geotechnical Institute, Oslo, Norway;5. Plaxis B.V., Delft, The Netherlands;1. Department of Civil Engineering, Tamkang University, Tamsui, Taipei 25137, Taiwan;2. Debao Group, Taipei, Taiwan;1. Department of Geotechnical Engineering, School of Civil Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;2. Geotechnical and Hydrogeological Engineering Research Group (GHERG), Federation University Australia, Victoria 3842, Australia;3. Wuhan Guangyi Transportation Science and Technology Co., Ltd, Wuhan 430074, China;1. School of Civil Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China;2. State Key Laboratory of Geological Disaster Prevention and Geological Environment Protection, Chengdu University of Technology, Chengdu, Sichuan 610059, China;3. Department of Structural Engineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, United States;1. Edinburgh Napier University (formerly University of Cantabria), School of Engineering and the Built Environment, Edinburgh Napier University, 10 Colinton Road, Edinburgh EH10 5DT, UK;2. Group of Geotechnical Engineering, Department of Ground Engineering and Materials Science, University of Cantabria, Avda. de Los Castros, s/n, 39005 Santander, Spain;1. School of Engineering, The University of Warwick, Coventry CV4 7AL, UK;2. Department of Civil Engineering, The University of Nottingham, Nottingham NG7 2RD, UK;3. Computational Geomechanics Division, Norwegian Geotechnical Institute, Oslo No-0806, Norway |
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| Abstract: | The paper presents numerical simulations investigating the settlement reduction caused by stone columns in a natural soft clay. The focus is on the influence of the soft soil alteration caused by column installation. A uniform mesh of end-bearing columns under a distributed load was considered. Therefore, the columns were modelled using the “unit cell” concept, i.e. only one column and the corresponding surrounding soil in axial symmetry. The properties of the soft clay correspond to Bothkennar clay, which is modelled using S-CLAY1 and S-CLAY1S, which are Cam clay type models that account for anisotropy and destructuration. The Modified Cam clay model is also used for comparison. Column installation was modelled independently to avoid mesh distortions, and soft soil alteration was directly considered in the initial input values. The results show that the changes in the stress field, such as the increase of radial stresses and mean stresses and the loss of overconsolidation, are beneficial for high loads and closely spaced columns but, on the contrary, may be negative for low loads, widely spaced columns and overconsolidated soils. Moreover, whilst the rotation of the soil fabric reduces the settlement, in contrast the soil destructuration during column installation reduces the improvement. |
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| Keywords: | Stone columns Installation Settlement reduction Numerical modelling Anisotropy Destructuration |
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