Abstract
Large-diameter hollow composite pile is a new type of pile which is composed of hollow pile, cement mixing pile around the pile and grouting soil around the pile. In order to analyze the influence degree of soil grouting and cement mixing pile around the pile on the improvement of pile foundation bearing capacity, the vertical and horizontal load-bearing characteristics of large-diameter hollow composite pile are studied by numerical simulation, and the structural practicability of the new foundation is analyzed. Research shows that grouting around piles and grouting around piles + cement mixing piles have obvious effects on the improvement of pile bearing capacity, the vertical bearing capacity increased is by 7.4% and 12.1% respectively, while the horizontal bearing capacity is increased by 7.2% and 14.4% respectively. Compared with solid group piles of the same pile side area, the bearing capacity of large-diameter hollow composite pile foundation is increased by 19.1%. The research results can provide theoretical basis and technical support for the design and construction of large-diameter hollow composite pile foundation.
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