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Simulating Centrifuge Model Tests of Laterally Loaded Pile Groups in CDSM-Improved Soft Clay Using a Nonlinear Winkler Model
Ground improvement is an area that contributes to sustainable development. Improving the engineering properties of soil using cement deep soil mixing (CDSM) is an example of green ground improvement technique. Considering the costs and environmental impacts of adding extra piles to an existing pile group, CDSM is one of the best ways to retrofit pile foundations to meet new seismic design criteria. The lack of well developed analysis techniques have, however, contributed to uncertain and sometimes conservative design of pile groups in CDSM-improved ground. In this study, a nonlinear Winkler foundation analysis method implemented in the program GROUP is used to simulate centrifuge model tests of laterally loaded pile groups in soft clays improved by cement deep soil mixing. The soil profile consisted of four lightly overconsolidated clay layers overlaying a dense layer of Nevada sand. The piles in the groups were spaced at 7.0 pile diameters and had a 2×2 symmetrical configuration in plan and were fixed to a rigid cap placed above the ground level. The predicted results are compared with those obtained from centrifuge tests and reasonable comparisons are obtained for the unimproved pile group and the pile group with a large CDSM block.
Simulating Centrifuge Model Tests of Laterally Loaded Pile Groups in CDSM-Improved Soft Clay Using a Nonlinear Winkler Model
Ground improvement is an area that contributes to sustainable development. Improving the engineering properties of soil using cement deep soil mixing (CDSM) is an example of green ground improvement technique. Considering the costs and environmental impacts of adding extra piles to an existing pile group, CDSM is one of the best ways to retrofit pile foundations to meet new seismic design criteria. The lack of well developed analysis techniques have, however, contributed to uncertain and sometimes conservative design of pile groups in CDSM-improved ground. In this study, a nonlinear Winkler foundation analysis method implemented in the program GROUP is used to simulate centrifuge model tests of laterally loaded pile groups in soft clays improved by cement deep soil mixing. The soil profile consisted of four lightly overconsolidated clay layers overlaying a dense layer of Nevada sand. The piles in the groups were spaced at 7.0 pile diameters and had a 2×2 symmetrical configuration in plan and were fixed to a rigid cap placed above the ground level. The predicted results are compared with those obtained from centrifuge tests and reasonable comparisons are obtained for the unimproved pile group and the pile group with a large CDSM block.
Simulating Centrifuge Model Tests of Laterally Loaded Pile Groups in CDSM-Improved Soft Clay Using a Nonlinear Winkler Model
Taghavi, Amirata (author) / Muraleetharan, Kanthasamy K. (author)
Geo-Congress 2014 ; 2014 ; Atlanta, Georgia
Geo-Congress 2014 Technical Papers ; 1254-1263
2014-02-24
Conference paper
Electronic Resource
English
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