Abstract Premature failure of cable bolts due to stress corrosion cracking (SCC) is a phenomenon that has reported to occur in underground environments. This paper presents an experimental study to determine the impacts of environmental factors on SCC in high-carbon steel cable bolts used in ground support system. The service life of the wire strands was measured under a range of accelerated SCC conditions using three- and four-point loading jigs. Fractographic analyses of the fracture surfaces of the failed wires displayed typical features indicating that hydrogen embrittlement was involved in SCC in these tests. It was shown that the presence of hydrogen sulphide is more critical than its concentration in SCC. The pH and level of applied stress were determined to have a direct impact on the occurrence of SCC. The deflection angle of the crack path was observed to be an inverse polynomial function of the applied stress level in the wire. This demonstrated the significance of the stress level on the fracture mechanism of cable bolts. Furthermore, the use of a protective galvanised coating on cable bolts was found to be a promising countermeasure against SCC. The results of this study provide detailed insight into the environmental factors involved in SCC of high-carbon steel wires and can be further used for setting guidelines for assessment of environments which cause susceptibility to SCC.

中文翻译：

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环境因素对冷拔高碳钢丝应力腐蚀开裂的影响

摘要 应力腐蚀开裂（SCC）引起的锚索过早失效是一种在地下环境中发生的现象。本文提出了一项实验研究，以确定环境因素对地面支撑系统中使用的高碳钢缆索螺栓 SCC 的影响。使用三点和四点加载夹具在一系列加速 SCC 条件下测量线股的使用寿命。断裂线材断裂面的断口分析显示出典型特征，表明在这些测试中 SCC 涉及氢脆。结果表明，硫化氢的存在比其在 SCC 中的浓度更为关键。pH 值和施加的压力水平被确定对 SCC 的发生有直接影响。观察到裂纹路径的偏转角是线材中施加的应力水平的逆多项式函数。这证明了应力水平对锚索断裂机理的重要性。此外，发现在电缆螺栓上使用保护性镀锌涂层是防止 SCC 的有希望的对策。这项研究的结果提供了对高碳钢丝 SCC 所涉及的环境因素的详细见解，并可进一步用于制定评估导致 SCC 易感性的环境的指南。发现在电缆螺栓上使用保护性镀锌涂层是防止 SCC 的有希望的对策。这项研究的结果提供了对高碳钢丝 SCC 所涉及的环境因素的详细见解，并可进一步用于制定评估导致 SCC 易感性的环境的指南。发现在电缆螺栓上使用保护性镀锌涂层是防止 SCC 的有希望的对策。这项研究的结果提供了对高碳钢丝 SCC 所涉及的环境因素的详细见解，并可进一步用于制定评估导致 SCC 易感性的环境的指南。