关键词: 竖孔掏土, 纠倾, 塑性半径, 数值模拟

Abstract: For inclined high-rise building with pile raft foundation, vertical hole digging is often used to relieve the ground stress to achieve the inclination correction. Due to the lack of theoretical guidance, the engineering design and construction have to rely to a large extent on experience. In this paper, the problem of stress redistribution around a vertical hole at a certain depth is simplified as a plane strain problem, and the analytical solution of the radius of plastic zone is derived by using the Mohr Coulomb strength theory. The analytical solution shows that the plastic radius increases with the decrease of shear parameters, the increase of digging hole radius and the increase of depth. By combining the site rectification phenomenon with the analytical solution formula, the influences of the groundwater, water injection, pumping, cyclic soil digging disturbance on the plastic radius are discussed. Finally, the numerical simulation is used to verify the analytical solution, which shows the validity and applicability of the formula. The research results will provide scientific insight for the design and smart construction of the rectification practice.

Key words: vertical hole digging, incline-rectifying, plastic radius, numerical simulation