Hydrogeochemical modelling of corrosive environment contributing to premature failure of anchor bolts in underground coal mines  

地下煤矿锚杆(索)过早失效腐蚀环境的水文地球化学模拟

作　　者：PENG Ya Wendy TIMMS 彭亚;Wendy TIMMS(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;School of Minerals and Energy Resources Engineering,UNSW Sydney,Sydney 2052,Australia;Faculty of Science Engineering&Built Environment,Deakin University,Geelong 3216,Australia)

机构地区：[1]School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]School of Minerals and Energy Resources Engineering,UNSW Sydney,Sydney 2052,Australia [3]Faculty of Science Engineering&Built Environment,Deakin University,Geelong 3216,Australia

出　　处：《Journal of Central South University》2020年第5期1599-1610,共12页中南大学学报（英文版）

基　　金：Project(140100153)supported by Australian Research Council Linkage Grant。

摘　　要：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.锚杆(索)被广泛应用于地下采矿和巷道掘进过程中以提高顶板稳定性。由于锚固材料的腐蚀敏感性、所处潮湿、腐蚀环境以及拉伸应力的影响,锚杆(索)的过早失效是地下开采工程中存在的重大安全隐患。本文将实验室实验与水文地球化学模型相结合,对地下煤矿水环境下锚杆(索)的腐蚀破坏进行了研究。根据实验数据和矿井水水化学数据,采用PHREEQC软件对锚杆(索)与矿井地下水和岩层材料间腐蚀反应进行了模拟分析。建立了一系列的模型量化铁和碳元素反应量,模拟了有氧和无氧条件下水环境中的化学反应,得到各离子浓度、pH和随反应进度的变化趋势,并与实验结果进行对比。结果表明,锚杆(索)的腐蚀受到某些自然环境因素的抑制,因为水中溶解氧可以促进更多铁氧化。通过水文地球化学模拟等手段,阐明了锚杆(索)周边环境是影响其应力腐蚀开裂过程的重要因素。

关 键 词：anchor bolts hydrogeochemical modelling rock bolts and cable bolts stress corrosion cracking water chemistry analysis 

分 类 号：TD353[矿业工程—矿井建设]