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Model tests on the lateral cyclic responses of a caisson-piles foundation under scour
| Content Provider | Scilit |
|---|---|
| Author | Zhang, C. R. Tang, H. W. Huang, M. S. |
| Copyright Year | 2018 |
| Description | As a new type of deep foundation, the caisson-piles composite foundation is a selection for the Qiongzhou Straits bridges. It can greatly reduce the height of the caisson by connecting the lower pile groups to the upper caisson, and improves its mechanical behaviour under lateral load.A series of model tests are conducted at 1g to investigate the scour effects on the responses of the caisson-piles composite foundation under long-term lateral cyclic load, in which two scour depths and two cyclic load amplitudes are applied. The cyclic load pattern is single cycle sinusoidal curve with 10,000 cycles. Based on the test results, the accumulated residual rotations are found to be dependent on the scour depth and the applied cyclic load amplitude. An empirical method is developed to predict the accumulated rotation due to long-term cyclic loading, in which the effect of scour is considered by a revised dimensionless cyclic load level, relating the cyclic load magnitude to the post-scour lateral capacity of the composite foundation. This chapter aims to study the cyclic interaction between the caisson-piles composite foundation and the soil in dry sand under scouring. An empirical method is developed to predict the accumulated rotation due to long-term cyclic loading, in which the effect of scour is considered by a revised dimensionless cyclic load level, relating the cyclic load magnitude to the post-scour lateral capacity of the composite foundation. The testing program comprises monotonic and cyclic tests with and without scour. The one-way cyclic loading increases the stiffness and capacity of the post-cyclic behaviour of the composite foundation subjected to monotonic load. The scouring has a disadvantageous effect on the behaviour of the composite foundation with a decreased capacity. A work-hardening behaviour of the measured load-displacement is obtained, which makes the identification of a distinct failure corresponding to the turning point difficult. Book Name: Physical Modelling in Geotechnics |
| Related Links | https://content.taylorfrancis.com/books/download?dac=C2018-0-86959-9&isbn=9780429438660&doi=10.1201/9780429438660-115&format=pdf |
| Ending Page | 766 |
| Page Count | 5 |
| Starting Page | 762 |
| DOI | 10.1201/9780429438660-115 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2018-07-11 |
| Access Restriction | Open |
| Subject Keyword | Book Name: Physical Modelling in Geotechnics Geological Engineering Composite Foundation |
| Content Type | Text |
| Resource Type | Chapter |
