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| Cumulative deformation of a caisson-piles composite foundation in sand subjected to cyclic lateral loading #br# |
| ZHANG Xun1，2，HUANG Maosong1，2 |
| (1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical and Underground Engineering of Ministy of Education，Tongji University，Shanghai 200092，China) |
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Abstract Model tests were carried out using a lateral cyclic loading device developed in-house. The lateral cyclic deformation and the displacement prediction model of a caisson-piles composite foundation and a caisson foundation were investigated under one-way and two-way cycling loading in symmetric and asymmetric forms. The model tests with approximately 10 000 cycles revealed that the cyclic cumulative displacement of the foundation behaved with two characteristic phases, firstly increasing rapidly with the increase of cycles and then gradually being stable. The magnitude of cyclic cumulative displacement was significantly affected by the cyclic loading path. Compared with the caisson foundation，the caisson-piles composite foundation improved significantly the ability of the foundation in resisting the lateral cyclic deformations. Finally，the prediction model of cyclic cumulative displacement was established on the basis of regression analysis of the model tests results. It was shown that the prediction model predict effectively the cyclic cumulative displacement under different cyclic loading paths.
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2016, Vol. 35 
