Abstract: Ground pressure increases obviously with the mining depth in mines.Sanshandao Gold Mine uses pipe joint bolt for supporting,which is hampered by insufficient tensile pull-out force and perishable bolts.In light of that,experimental study on hydraulic expansion bolt reinforcement and support technology is carried out.The action mechanism of the hydraulic expansion bolt is deeply analyzed.The numerical simulation analysis of the supporting effect of hydraulic expansion bolts in roadway surrounding rock was carried out,and the influence laws of bolt row spacing,bolt spacing,and the number of bolts in each row on the characteristics of stress,deformation,and plastic zone of roadway surrounding rock were compared and analyzed.The support design scheme was applied in the field,and the support effect was monitored and evaluated.The test shows that the tensile pull-out force of pipe joint bolts is 20-30 kN.When the hydraulic expansion bolt is pressurized to 12 MPa,the tensile pull-out force can reach about 100 kN.After pressure relief,the tensile pull-out force is still significantly higher than that of the pipe joint bolt,indicating that the hydraulic expansion bolt can better squeeze and strengthen the surrounding rock,provide strong support resistance and ensure the bolting effect.