<p>To investigate the mechanism of anchor-grouting support in the construction of roadway roof cut-off, this study focuses on a typical deep roadway with fractured surrounding rock. This research employs a combined methodological approach. Theoretical analysis and physical model experiments were integrated to investigate anchor-grouting reinforcement mechanisms. Specifically, we quantify how this technique enhances support efficiency in surrounding rock strata. Furthermore, an analytical model is established to characterize the comprehensive mechanical properties of the rock mass reinforced by anchor-grouting. This study investigates the influence mechanisms of four key parameters (namely cohesion, internal friction angle, cable preload, and layout spacing) on the mechanical properties of the anchorage grouting complex. Building upon the roof evolution mechanism of roof-cutting roadways, theoretical formulas for calculating the required support strength in both the influence area of coal seam and the stability area of coal seam are established and validated through large-scale geomechanical model tests. The results demonstrate that the combined anchor-grouting support technology effectively reduces both horizontal stress and displacement in the surrounding rock strata, confirming its engineering applicability for deep soft rock roof-cutting projects. These findings provide valuable technical references for the design and construction of similar mining engineering projects.</p>