• The anchor box beam support system reduces peak stress by 21.9% and increases average deformation by 135.0% compared to conventional support members.
• The ultimate bending bearing capacity of the box-shaped support beam is 3.5 times that of traditional channel beam.
• The effective compressive stress zone of high prestressed cables is expanded by 26.4%, enhancing the prestressed support influence range.
• Field tests demonstrate that the anchor box beam system reduces surrounding rock convergence by 41.2% and 22.2% relative to anchor channel beam and anchor I-shaped beam supports.