Research And Controlling On Settlement Characteristic Of Rotary Drilling Pile Considering The Bottom Sediment And Negative Friction

With the construction will go out of the country, construction will encounter more geological environment, which means that the design and construction of infrastructure projects will be more challenging. Pile foundation usually buried in the soil, working with soil around the pile. Thus, the pile foundation often have very complex mechanical properties. Mechanical properties tend to be affected by the geological conditions and construction process, such as the case of negative friction pile of soil consolidation settlement and appear at Heaping pile construction situations, and for example in the construction process of the pile, will be accompanied by the sediment generated when the sediment thickness exceeds a certain value, it will have some impact on the performance of pile's bearing. Serious, even threaten the safety of buildings. Therefore, strengthening the theory pile research is very important. Considering the current comprehensive study specifically related to Negative friction effects of the sediment-defect piles is not start actually, in this context, the comprehensive research and analysis by chosen a pile with negative effects and pile tip with sediment-defect can provide some guidance and help for the future projects.In previous research base on large number of scholars, this paper introduced the assumed curve of the soil around the pile settlement and build the mechanical model.Get out of the calculation of the analytical solution about the sediment-defect pile with negative effects. Mainly do the following three aspects:(1) In view of the defects pile with bottom sediment, using the assumed curve of the soil around the pile settlement and using three linear softening function model to calculate sediment are both very much in line with the actual situation. In accordance with a large number of previous studies, this paper can get a complete analytical solution, the solution can be determined by analyzing the axial force effect of negative friction at any stage, such as the pile's axial force pile settlement.(2)In order to use analytical solution to calculate the sediment-defect pile's whole process under the effects of the negative friction better, In this paper, I use Visual C ++ to develop the required calculation software.(3) Based on the previous experimental data collation and analysis, we can get the parameters of the analytical solution required. Comparing the calculated results and experimental data found they have a good agreement. So the mechanical model, analytical solution and calculation software are all right.(4)By changing related parameters, we can get the qualitative analysis about the parameters how influence on the pile performance.This paper presents a quantitative idea of lagrange interpolation method, combined with the research group's simulation data on the sediment-defect pile. This provides a quantitative idea of the sediment-defect pile's all performance.Considering the current comprehensive study specifically related to Negative Friction effects of the sediment-defect piles is not start actually, Based on ABAQUS finite element numerical simulation,from the fill thickness, sediment elastic modulus, pile load to calculated and compared the sediment-defect pile with negative effects. providing basic theoretical support for the further development of future-related topics.