Elastic-plastic Analytical Solutions of Deformation of Uplift Belled Pile

Original scientific paper In this paper, based on the overlapping deformation mode of load transfer law of uplift belled pile, and the theory of elastic mechanics, the elastic-plastic analytical solutions of uplift belled pile were derived, and the nonlinear elastic-plastic deformation analysis method was established, which made the deformation analysis theory of uplift belled pile more reasonable. The deformation analysis method of uplift belled pile was extended to uplift pile with change location expanding body (CLEB), which was carried out the deformation analysis of uplift pile under the complex load conditions conveniently. The deformation analytical solutions derived in this paper were simpler, avoid unit division of pile and tedious numerical calculation. Through the comparison between test results and results of theoretical calculation, it was shown that the elastic-plastic analytical solutions were close to the field test results. The elastic-plastic method in this paper provided a reference for engineering design of uplift belled pile. The method established in this paper could calculate the load-deformation relationship of uplift belled pile which has high level of bearing capacity, so it has important role to reduce or partially replace the field loading test work. Finally, the method was used to analyse the main factors of uplift belled pile of affecting the deformation character of the uplift belled pile.