Mechanism and application of anchor-grouting coupling support in deep soft rock mining roadways

In response to the problem of large mining-induced deformation of surrounding rock in coal mine mining roadways, this study proposes a bolt-grouting coupled support technology solution. Conventional support is difficult to control the expansion of the surrounding rock loosening zone, leading to high maintenance costs and poor safety. Through theoretical analysis, numerical simulation, and field tests, combined with borehole imaging technology and rock mechanics parameters, a synergistic support system of roof grouting anchor cables and rib grouting bolts was established. Theoretical calculations (e.g., the bolt length formula L_C = L₁ + Δ) and numerical simulation optimization show that this technology reduces roof subsidence from 1141 mm to 148 mm and sidewall convergence from 1463 mm to 157 mm, significantly shrinks the plastic zone, and achieves a support efficiency exceeding 90%. Industrial tests confirm its long-term stability, with deformation controlled within a safe range. The innovation lies in proposing a dynamic design method based on borehole imaging, achieving surrounding rock-support integration through the synergy of grouting bolts (cables). This provides a new approach for supporting deep high-stress soft rock roadways, significantly enhancing reliability and reducing maintenance costs.