【摘 要】
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The premature failure of rockbolts is a serious issue in underground coal mines which compromise the safety and economic viability of underground excavations.Over the last two decades research into th
【机 构】
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School of Mining Engineering ,UNSW Sydney, NSW 2052 ,Australia
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The premature failure of rockbolts is a serious issue in underground coal mines which compromise the safety and economic viability of underground excavations.Over the last two decades research into the premature failure of rockbolts has resulted in a greater understanding of the causes and mechanisms involved.However,work to date has failed tocorrelate the incidence of failures to groundwater chemistry alone.Frequent premature failures in claystone band rich regions suggested that the presence of clay strata in underground mine roof is an influencing factor.In this study, the relationships between the premature failure of rockbolts and presence of claystone bands are determined.The results of this study revealed that the presence of clay indirectly influences the corrosion of rockbolts and is associated with changes in local water chemistry that could be related to ion exchange and sorption at the clay surface.Furthermore,an increase in ion concentration and saturation near clay bands corresponded to an accelerated corrosion rate.The result of this study advanced the current state of knowledge pertaining to the corrosion of rockbolt systems.
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