Study On Influence Of Foundation Slag Of Rotary Bored Piles On Foundation Bearing Capacity

The bored-pile foundation influenced by the construction equipment,the technology and the level of process,there are various in the pile foundation,the bottom sediment is the most common one.So how to solve the problem of the pile bottom sediment reasonable and effectively,realizing the maximum bearing capacity of pile foundation has become an important issue in the engineering field.The paper based the model test,using the numerical simulation,researched on the pile foundation's bearing capacity in the vertical load with the rotary excavation of pile bottom sediment.The main contents are as follows:According to the existing problem of sediment,combining the pile-soil interaction theory,considering the bottom sediment has great compressibility make the pile fully penetrate down,ensuring the pile and the soil deformation and bearing the potential of synchronized play,as a result improve the bearing capacity of pile.Then it advanced the paper's research content.It designed and completed the model test of single pile series,using the pile bottom sediment.Based on the model test data,the paper compared the load bearing characteristics of single pile series in detail and analyzing the pile-soil sharing relationship.The results show that,after the pile compacted the sediment,its bearing capacity would still recover to normal bearing performance.And it verified that the method of preload the pile for treating the sediment is feasible in theory.Utilize large finite element software ABAQUS,the paper set up the calculating model of changing elasticity module for the sediment.Numerical simulation of pile foundation bearing capacity test on sedimentation,numerical analysis and comparison of model tests.The results show that when the pile end is mainly subjected to load,the back-end resistance of the pile bottom is normalized,so that the bearing capacity of the pile foundation is improved,so it is the deficiency of the indoor model test.Eventually,the paper using the method described analyzed an existing actual engineering by ABAQUS.The result show that it is similar to the measured data,which shows that it is feasible to analyze the project by numerical simulation,and also shows that the results of theoretical analysis can be consistent with the actual project.Furthermore,the influence of sediment on the working performance of pile foundation is analyzed,and meaningful conclusions are obtained.The composite pile foundation and its corresponding elevated pile cap method are proposed,which have certain value for future construction and research.