神东矿区矿井水对锚索腐蚀影响实验研究

Experiment on the influence of mine water on anchor cable corrosion in Shendong mining area

为研究神东矿区矿井水中主要离子对井下锚索加速腐蚀的影响程度,明晰锚索在井下环境中加速腐蚀的主要因素与腐蚀机理,以神东矿区布尔台矿为工程背景,通过现场踏勘、水质取样与化验获得了井下环境特征与矿井水中6种主要离子含量,并开展加速腐蚀盐雾实验研究加速腐蚀的主要离子成分与腐蚀机理,采用腐蚀形貌、质量失重率、截面积损失率及力学性能衰减四个指标评价矿井水中主要离子对锚索加速腐蚀的影响程度。实验结果表明,神东矿区井下锚索腐蚀反应为吸氧腐蚀,Cl^(-)离子对锚索加速腐蚀的促进作用最大,矿井水中6种主要离子腐蚀影响程度由大到小为Cl^(-)>SO_(4)^(2-)>CO_(3)^(2-)>F^(-)>Mg^(2+)>Ca^(2+),揭示了井下锚索加速腐蚀的机理,对井下巷道的支护设计和锚索使用寿命研究具有重要意义。

In order to study the influence of the main ions in the mine water of Shendong mining area on the accelerated corrosion of the underground anchor cable,and clarify the main factors and corrosion mechanism of the accelerated corrosion of the anchor cable in the underground environment,Buertai Mine of Shendong mining area is taken as the engineering background,and the characteristics of the underground environment and the content of six main ions in the mine water are obtained through field survey,water quality sampling and chemical inspection.Accelerated corrosion salt spray experiment is carried out to study the main ion composition and corrosion mechanism of the anchor cable,and the influence of the main ions in the mine water on the accelerated corrosion of the anchor cable is evaluated using the indicators of corrosion morphology,mass loss rate,sectional area loss rate and mechanical property attenuation.The experimental results show that the corrosion reaction of the underground anchor cable in Shendong mining area is oxygen absorption corrosion,and Cl^(-)has the greatest promoting effect on the accelerated corrosion of the anchor cable.The corrosion degree of the six main ions in the mine water from large to small is Cl^(-)>SO_(4)^(2-)>CO_(3)^(2-)>F^(-)>Mg^(2+)>Ca^(2+),revealing the mechanism of the accelerated corrosion of the underground anchor cable,which is of great significance to the support design of the underground roadway and the study of the service life of the anchor cable.