关键词: 金属锚杆　加速腐蚀　力学特征　拉伸断口　围岩稳定性

Abstract: In view of the problem that the anchor bolt is prone to corrosion and deterioration under the action of water
spray in deep roadway,the accelerated corrosion treatment of anchor bolt by water immersion is designed and carried out. The
tensile tests of bolts with different corrosion time were carried out,and the mechanical characteristics and corrosion mechanism
of bolts before and after corrosion were analyzed. The influence of bolt corrosion on the stability of roadway surrounding rock
was studied by numerical simulation. The results show that the corrosion pits of the bolts gradually connect with each other during
the corrosion process,and change from local corrosion to comprehensive corrosion. The mass loss rate of the bolt gradually
increases with the increase of the corrosion age,but the corrosion rate gradually slows down. The mechanical properties such as
yield load,fracture load and elongation of the bolt show a downward trend with the increase of corrosion age,and the brittleness
is significantly enhanced. The fracture morphology of the bolt changed from the tensile dominant mode before corrosion to the
tensile-shear mixed mode. Bolt corrosion will also aggravate the stress concentration and deformation of roadway surrounding
rock,which is not conducive to the stability of roadway. It is proposed that the adverse effects of watering on the stability of
roadway surrounding rock can be effectively alleviated by adopting anti-corrosion materials,increasing support strength and water
drainage.

Key words: metal bolt,accelerated corrosion,mechanical characteristics,tensile fracture,stability of surrounding rock