Coupling effects of pressed caisson and uplift piles on surface settlement

Constructing underground railway stations using the pressed continuous caisson group is a new type of prefabricated assembly construction mode. However, compared to the traditional open-pit excavation method of station construction, there is currently a lack of research on the environmental impact of the caisson pushing process. Therefore, taking the actual projects as a background, this study conducted numerical simulations and combined existing measured data to fit subsidence profile curves. The influences of the presence or absence of the reactive piles outside the caissons on the surface settlement profile are investigated. Further investigations are done on the regulation effects of pile spacing on the surface settlement. Based on the principle of the equivalent anti-pulling bearing capacity, the influences of pile spacing and pile diameter on the settlement of the surrounding soil are also explored. Consequently, a modified normalization curve for the settlement profile of the soil outside and between piles is formed, and it may provide reference support for the implementation of the underground stations with pressed continuous caisson group in densely populated urban centers.