In order to evaluate the influence of strain softening and strain rate effect on the horizontal bearing characteristics of the four-pile foundation,a two-dimensional plane tetrapod pile foundation model by ABAQUS is developed.The relationship between the change of the undrained shear strength su of soft clay with the cumulative plastic shear strain and the maximum shear strain rate is defined in the vumat user subroutine,and the effects of the strain softening parameters δrem,ξ95 and the strain rate parameter μ on the horizontal bearing characteristics of the four-pile foundation are analyzed.The analysis results show that the horizontal bearing capacity of the four-pile foundations decreases with the decrease of the strain softening parameters δrem and ξ95,among which δrem has a more significant effect on the horizontal bearing capacity;The strain rate parameter μ shows a linear positive correlation with the horizontal bearing capacity of the four-pile foundations.Finally,based on the study findings,an unified prediction model of the horizontal bearing capacity of four-pile foundations considering strain softening and strain rate effect is established.
关键词
海上风电/黏土/应变率/应变软化/水平承载力/四桩基础
Key words
offshore wind power/clay/strain rate/strain softening/horizontal bearing capacity/four-pile foundation
维普
万方数据