Simplified Deformation Analyses of a Single Pile Subjected to Different Deformation Modes of the Pit Enclosure Structure

Abstract

During the excavation of a foundation pit, differences in the stiffness of an enclosure structure with different supports may lead to different deformation modes of the enclosure structure. Without considering the effects of both pore–fluid and chemical reactions in the surrounding soils, the existing simplified analytical method is used to approximate pit sidewall deformation curves under four typical pit enclosure deformation modes, so that the horizontal displacement curves of a neighboring single pile are obtained by the image source method. Based on the results obtained from the simplified analytical method, it is concluded that both the maximum cumulative deformation value and the deformation pattern of a foundation pit enclosure structure can have nonnegligible effects on the horizontal displacement of the adjacent single pile. The maximum horizontal displacement of the single pile in the adjacent pit increases linearly with the control parameters of the pit enclosure structure, while it decreases nonlinearly with either an increase in the horizontal distance from the enclosure structure or a decrease in the excavation depth.