Rock bolts are widely used in the main structure of the DC transit system and play the role of the main body reinforcement and support. Because of the extensive stray current in the subway system, the corrosion risk of rock bolts is greatly increased. Therefore, the rock bolt was experimentally studied by simulating the input stray current and monitoring the polarization potential in this paper. After the stray current corrosion (SCC) process was finished, a tensile and breaking experiment of the corroded specimens was conducted for the mechanical properties. As an important parameter to indirectly characterize the corrosion strength of the stray current, the polarization potential was analyzed. Two types of rock bolts were compared for their mechanical properties and corrosion parameters. The result shows that the rock bolt with stranded steel wire as the rod has better corrosion resistance than the HRB500 rebar. Hence, the bonded stranded steel wire is more resistant to the stray current corrosion than the HRB500 rebar, which is adaptive for rock bolts in the direct current (DC) transit system. Graphical Abstract Experimental research examining the stray current corrosion of rock bolts in the DC transit system.

中文翻译：

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直流输电系统中锚杆杂散电流腐蚀的试验研究

锚杆广泛用于直流输电系统的主体结构中，起到主体加固和支撑的作用。由于地铁系统中存在大量杂散电流，大大增加了锚杆的腐蚀风险。因此，本文通过模拟输入杂散电流和监测极化电位对岩石锚杆进行了实验研究。在杂散电流腐蚀（SCC）过程完成后，对腐蚀后的试样进行拉伸和断裂试验，以获得力学性能。作为间接表征杂散电流腐蚀强度的重要参数，极化电位被分析。比较了两种类型的岩石锚杆的机械性能和腐蚀参数。结果表明，与HRB500钢筋相比，以绞合钢丝为杆的岩石锚杆具有更好的耐腐蚀性能。因此，粘合绞合钢丝比HRB500钢筋更耐杂散电流腐蚀，适用于直流（DC）传输系统中的锚杆。图形摘要 直流传输系统中岩石锚杆杂散电流腐蚀的试验研究。