Application of unequal length double-row piles in a foundation pit project in Wuhan

Abstract:

Taking the deep foundation pit support project of Wuhan Renheng Park Century as the research background, design calculation and analysis is conducted with Tianhan Design Software on some support section of the project, where the foundation pit was supported by unequal double-row piles, that is, the front row piles were longer and the rear row piles were shorter. The results of calculation and analysis shows that the maximum displacement of the front row and rear row piles of the support section is 37.9mm, that occurs at 1.0m below the ground (at the top of the pile), and the elastic resistance safety factor in the passive zone is 3.90. The early warning control index for the foundation pit of this project is the horizontal displacement of the supporting structure not greater than 40mm, which can meet the design monitoring requirements and provide reference for the future application of unequal length double-row piles in the foundation pit.

Key words:foundation pit support; unequal length double-row piles; pile top displacement; Wuhan area