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

The sedimentation of adjacent buildings and the transmutation of supporting piles were simulated by large-scale 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 hyper static 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.