Analysis Of Consolidation Settlement Of Composite Foundation With Composite Piles Under Graded Coastal Loading

In order to further improve the consolidation theory of composite pile composite foundation and study the influence of the spatial and temporal distribution of additional stress on the consolidation behavior of composite pile composite foundation,the current research on the consolidation theory of composite pile composite foundation does not consider the change of stress with time and depth under hierarchical loading.The consolidation and settlement behavior of raft foundation combined with seepage gravel pileCFG pile composite foundation in coastal area was studied.In this paper,the composite foundation of composite seepage gravel pile and CFG pile is taken as the research object.Considering the consolidation deformation of gravel pile,smearing effect of different piles and the variation of additional stress with depth and time,and combined with the engineering conditions of building load grading,the analytical method is used to establish the time,time and stress models The analytical solution of consolidation of composite foundation of gravel pile CFG pile with combined seepage and different distribution of additional stress in three dimensions of space and time and space.Combined with an engineering example,MATLAB was used to program the solution of the paper.Taking different loading history,three modes of additional stress distribution along the depth and pile-soil modulus ratio as basic variables,the overall average consolidation degree curve of composite foundation of composite seepage gravel pile CFG pile under corresponding working conditions was drawn,and then the calculation results were analyzed.The results show that when the load is applied instantaneously,the four modes of non-uniform distribution of additional stress along the depth have obvious influence on the consolidation degree of composite foundation of gravel pile CFG pile with combined seepage;The results show that the consolidation rate of composite foundation is greatly affected by different loading history;The results show that the different distribution patterns of additional stress along the depth have little effect on the consolidation rate of composite foundation,so the calculation formula of consolidation degree can be simplified,which is easy for engineering application;When the modulus of CFG pile-soil is small,the distribution pattern of additional stress along the depth leads to the difference of final settlement results.However,when the modulus ratio of CFG pile-soil increases,the settlement difference gradually decreases,and the effect of the distribution of additional stress on settlement is not obvious.The finite element software ABAQUS was used to analyze the fluid structure interaction of the soft soil composite foundation with no penetration.The load changes linearly with time,and the consolidation behavior and settlement law of the composite foundation with no penetration are obtained by considering the differential settlement of pile and soil and the condition of single side drainage.By combining theoretical derivation with ABAQUS finite element simulation,the consolidation law of composite seepage gravel pile-CFG pile composite foundation considering the space-time effect of additional stress under coastal phase fractional loading was studied.According to the formula of consolidation degree,the settlement deformation of composite pile composite foundation can be predicted at any time,which provides a basis for the settlement control of engineering in coastal area.Through engineering example verification,the rationality of the solution is proved,and the consolidation theory of composite seepage gravel pile-CFG pile composite foundation is further improved.