Anchor bolts are commonly used throughout underground mining and tunnelling operations to improve roof stability. However, premature failures of anchor bolts are significant safety risks in underground excavations around the world due to susceptible bolt materials, a moist and corrosive environment and tensile stress. In this paper, laboratory experiments and hydrogeochemical models were combined to investigate anchor bolt corrosion and failure associated with aqueous environments in underground coal mines. Experimental data and collated mine water chemistry data were used to simulate bolt corrosion reactions with groundwater and rock materials with the PHREEQC code. A series of models quantified reactions involving iron and carbon under aerobic and anaerobic conditions in comparison with ion, pH and pE trends in experimental data. The models showed that corrosion processes are inhibited by some natural environmental factors, because dissolved oxygen would cause more iron from the bolts to oxidize into solution. These interdisciplinary insights into corrosion failure of underground anchor bolts confirm that environmental factors are important contributors to stress corrosion cracking.

地脚螺栓通常用于整个地下采矿和隧道作业中，以提高顶板稳定性。然而，由于易受影响的螺栓材料，潮湿和腐蚀的环境以及拉伸应力，地脚螺栓的过早失效在世界范围内的地下挖掘中都是重大的安全隐患。本文结合实验室实验和水文地球化学模型，研究了地下煤矿与水环境有关的地脚螺栓腐蚀和破坏情况。实验数据和矿井水化学整理数据通过PHREEQC代码用于模拟螺栓与地下水和岩石材料的腐蚀反应。与实验数据中的离子，pH和pE趋势相比，一系列模型量化了有氧和厌氧条件下涉及铁和碳的反应。该模型显示腐蚀过程受到某些自然环境因素的抑制，因为溶解的氧气会导致螺栓中的更多铁氧化成溶液。这些关于地下锚栓腐蚀破坏的多学科见解证实，环境因素是造成应力腐蚀开裂的重要因素。