Supporting soft rock roadways in coal mines has long posed a formidable
challenge. Addressing issues such as the formation of soft rock strata, poor
fracture development, limited tolerance, and the frequent and severe damage
sustained by conventional bolts due to their low elongation and bearing
capacity, this study employs bottom expansion and filling technology. It
combines theoretical analysis with booster bolt pull-out tests to scrutinize
the radial stress distribution of bolts under extrusion forces. Moreover, it
conducts a comparative analysis of bolt bearing characteristics under varying
radial pressurization conditions, delving into the impact of radial directional
increases in compressive stress on bolt anchoring performance.
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