Abstract: Based on the shield cutting municipal underground pile group in the Guangzhou-Dongguan-Shenzhen In? tercity Rail Transit tunnel project, a mathematical model for shield cutters cutting different spatially distributed pile foundations is established. Numerical simulation methods are used to explore the impact of spatial effects on the shield cutting pile group, and optimization suggestions for tunnelling parameters are proposed and validated based on the engineering practice. The research results show that:(1) The spatial distribution of pile foundations during shield cutting can be characterized by the cutter′s cutting angle. When the cutting angle approaches 90°, the pile foundation is near the center of the cutterhead; when the cutting angle approaches 0°, the pile foundation is near the edge of the cutterhead. (2) When cutting the reinforcement in pile foundations near the edge of the cutterhead, the cutter tools tend to break the reinforcement rather than cut it. As the pile foundation moves from the center of the cutterhead to the edge, the shear force exerted on the reinforcement by the cutters decreases significantly, by up to 56.7%, while the tensile force increases significantly. (3) The closer the pile foundation is to the edge of the cutterhead, the larger the cutting angle left on the reinforcement by the cutting tool, and the longer the cutting. (4) When cutting pile foundations near the edge, the shield machine can appropriately increase the penetration, thrust, and torque, which in turn increases the shear force of the cutters on the reinforcement at the cutterhead edge, facilitating cutting reinforcement.