Numerical Simulation Analysis of Stress Distribution in Composite Foundation Reinforced by Rigid Pile with Thick Cushion

School of Architecture and Transportation Engineering, university of electronic technology, Guilin, Guangxi 541004, China

^* Corresponding Author’s email: caj3026@163.com

Abstract

The method of mathematical simulation was adopted to get the stress distribution of composite foundation with thick cushion, rigid foundation and rigid piles. In this paper, 21 models were calculated and get the stress distribution of the pile and the soil around piles in the models with different pile lengths (9m, 12m,15m, 18m, 21m) and different pile spaces (3d, 4d, 5d, 6d (d is diameter)). The result turns out that the position where the minimum stress of soil around piles appear is 3 meters from the pile tip when the space is less than or equal to 4d, then the stress increases with increasing depth to the maximum at the position where is 3 meters under the pile tip, then the stress starts to decrease with the increasing depth till 0. The law on the change of additional stress of soil is the same as the natural ground without the processing when the space is greater than or equal to 5d. The axial stress of piles first increases with the depth and then decreases, and the position where maximum stress appears is L/3~L/4 under the pile top. The total influence depth of additional load increases and the influence depth under the pile tip of additional load decreases with increasing pile length, it decreases with increasing pile space.