Finite Element Research of Self-Supporting Technology in Construction of Underground Structures Adjacent to Existing Buildings

Abstract

The sedimentation of adjacent buildings and the transmutation of supporting piles were simulated by largescale finite element engineering software ANSYS according to a residential community foundation-pit excavation practice. Then the data was compared with monitoring data in the actual construction process, and innovative technology programs were designed. It relied on the underground engineering structure self-stiffness to provide supporting points for retaining piles, turning retaining points from cantilever components into multi-span continuous hyperstatic components. It greatly reduced the effect of bending moment of supporting piles. So that we can significantly reduce supporting piles' length and sectional area of the design, saving about 60% of construction cost and shorting construction period. The success of the technology research and application has accumulated experience for future similar underground construction.