Numerical Analysis for Influence of Cushion Thickness on Characteristics of Composite Foundation

By using the finite element analysis software ANSYS to establish the numerical model of long-short-pile composite foundation,the influence of cushion thickness variation on the settlement and stress characteristics of the corner pile,side pile and center pile in long-short-pile composite foundation is researched here in detail.The analysis results show that with the cushion thickness increasing,the settlement of long pile also decreases,when the cushion thickness is 0.15 m,the maximum settlement of short pile appears,and in various cases,the settlement values of short pile are general in agreement;With the cushion thickness increasing,the stress value of long pile decreases,but the change is less and less obvious,especially when the thickness is from 0.3 m to 1.0 m,there is no change.Combined practical engineering with numerical model analysis,it is shown that the most economic value of cushion thickness should be between 0.3 m to 0.6 m.