摘要
针对致密坚硬煌斑岩侵入煤层引起的采掘困难,以山西大同同发东周窑煤矿的煌斑岩为研究对象,使用不同pH值溶液浸泡岩样,对浸泡后煌斑岩岩样的峰值强度、矿物成分和微观结构进行研究,探究化学溶液对煌斑岩力学性能的影响规律及腐蚀机制。结果表明:在不同pH值的化学溶液腐蚀下,煌斑岩会发生损伤软化,不同溶液对煌斑岩抗压强度的损伤程度由大到小依次为酸性溶液、碱性溶液、中性溶液,且软化效果随时间的延长而增强;中性溶液主要溶蚀黏土类矿物,酸性溶液会加速侵蚀煌斑岩中的坚硬碳酸盐,碱性溶液主要腐蚀煌斑岩中的石英等矿物;酸性溶液与煌斑岩发生剧烈反应,试样表面产生大量孔隙,岩石结构随着侵蚀时间的延长而变得松散。研究结果可为类似煌斑岩侵入情形下的快速采掘提供理论依据和工程参考。
Aiming at the problem of difficulty in mining due to the intrusion of dense and hard lamprophyre into the coal seam,this paper took the lamprophyre collected from Datong Tongfa Dongzhouyao Coal Mine as the research object,soaked the samples with different pH value solution to investigate the peak strength,mineral composition and microstructure of the porphyry rock sample after soaking,and explore the influence law and corrosion mechanism of the chemical solution on the mechanical properties of lamprophyre.The results show that,under the corrosion of chemical solutions with different pH values,lamprophyre is damaged and softened,the degree of damage is acidic solution,alkaline solution,neutral solution in order of large to small,and the softening effect increases with time;neutral solution mainly corrodes clay minerals,acidic solution accelerates the erosion of hard carbonates in lamprophyre,and alkaline solution mainly oxidizes quartz and other minerals in lamprophyre;acid solution reacts violently with lamprophyre,and a large number of pores are generated on the surface of the sample.As the erosion time prolongs,the structure becomes loose and contributes to the rapid softening of lamprophyre.This study can provide theoretical basis and engineering reference for rapid mining under the conditions of lamprophyre intrusion.
作者
付运凯
杨永康
郭彦科
王庆龙
何宏伟
FU Yunkai;YANG Yongkang;GUO Yanke;WANG Qinglong;HE Hongwei(Key Laboratory of In-situ Property Improving Mining of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China;College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《太原理工大学学报》
CAS
北大核心
2020年第3期404-410,共7页
Journal of Taiyuan University of Technology
基金
国家自然科学基金资助项目(51404167)
山西省应用基础研究资助项目(201701D221082,201801D121034)。
关键词
煌斑岩
化学溶液
腐蚀机理
强度软化
酸性溶液
碱性溶液
lamprophyre
chemical solution
corrosion mechanism
strength softening
acidic solution
basic solution
