Abstract: In building and other structure tilting correction projects, the soil extraction from a vertical hole is usually used to release the stress of the foundation soil, which causes the foundation soil to flow directionally into this vertical hole for the soil extraction to achieve desired tilt correction. Based on the mechanical analysis of the circular hole expansion theory, soil plastic zone of induced by the soil extraction was formulated. Using engineering case histories, a parametric study was performed on related soil extraction parameters such as the depth, spacing, and diameter of soil extraction holes, and suggested values for the related vertical soil extraction hole design parameters were proposed. Studies have shown that: as the depth increases, the extent of the plastic zone gradually decreases, and the larger the hole diameter, the larger the extent of the soil plastic zone around the hole; for high-rise buildings, the depth of stress relief holes can be appropriately increased; while for lowrise buildings, shallow holes should be the main focus. Deep soil extraction hole will increase the project cost, but the effect of the tilt correction is limited. 

Key words: stress release method, circular hole expansion, soil extraction parameters, tilting correction