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Aiming at the erosion damage of backfill materials caused by sulfate solution erosion and dry-wet cycling, dry-wet cycling tests of backfill specimens were carried out in tap water and sodium sulfate solutions with mass concentrations of 3%, 6% and 9%, respectively. Meanwhile, the microstructures of the backfill were observed by scanning electron microscopy (SEM). The damage evolution law and erosion damage mechanism of the backfill were studied. The test results show that after 120 times of dry-wet cycling, the mass of the backfill decreases by only 0.19% in the tap water environment. However, the mass losses under the erosion of sodium sulfate solutions with mass concentrations of 3%, 6% and 9% are 0.73%, 1.52% and 3.64% respectively, and the mass reduction amplitude increases in a gradient manner with the increase of solution concentration. Under the condition of the same sodium sulfate solution concentration, the uniaxial compressive strength of the backfill specimens shows a gradual decreasing trend with the increase of the times of dry-wet cycling. After undergoing 30 times of dry-wet cycling of erosion in a 3% sodium sulfate solution, the uniaxial compressive strength of the backfill increases from 14.36 MPa to 14.85 MPa. The free sulfate ions in the sodium sulfate solution enter the backfill and chemically react to form ettringite. A small amount of ettringite is filled into the internal pores of the backfill, which enhances the mechanical properties of the backfill to a certain extent. However, with the increase of ettringite, the density of microscopic defects in the backfill increases, resulting in a gradual decline in its strength.

, authors=Yalei JING¹, Sheng ZENG², Hao LI³, authorsList=Yalei JING, Sheng ZENG, Hao LI, authorCompany=null, correspAuthors=Hao LI, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1322559870566510871, articleId=1322559870105137429, tenantId=1146029695717560320, journalId=1225396423026438145, language=CN, title=干湿循环与硫酸盐侵蚀交替作用下充填体的力学特性及损伤机制研究, columnId=1226462295417598973, journalTitle=矿业研究与开发, columnName=矿山安全与环保, runingTitle=null, highlight=null, articleAbstract=

针对硫酸盐溶液侵蚀和干湿循环导致矿山充填体材料损伤的问题，对充填体试件用自来水和质量浓度分别为3%、6%、9%的硫酸钠溶液进行了干湿循环试验，并利用扫描电子显微镜观察充填体的微观结构。对充填的损失演化规律与腐蚀损伤机理进行了研究。试验结果表明，经过120次干湿循环后，充填体质量在自来水环境下仅下降0.19%，而在3%、6%、9%质量浓度的硫酸钠溶液侵蚀下，质量损失分别为0.73%、1.52%、3.64%，质量下降幅度随溶液浓度呈梯度增长；相同硫酸钠溶液浓度条件下，随着干湿循环次数的增加，充填体试件的单轴抗压强度一般呈现逐渐下降的变化趋势，但在3%的硫酸钠溶液条件下干湿循环30次后，充填体单轴抗压强度由14.36 MPa增至14.85 MPa；硫酸钠溶液中游离的硫酸根离子进入了充填体内部，发生化学反应生成钙矾石，少量的钙矾石充填到充填体内部孔隙中，在一定程度上对充填体力学性能具有增强效应；但随着钙矾石的增多，充填体内微观缺陷密度增大，导致其强度呈现逐渐下降的变化趋势。

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景亚磊（1991—），男，河南平顶山人，硕士，讲师，主要从事水泥水化特性研究。E-mail:1377341647@qq.com

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景亚磊（1991—），男，河南平顶山人，硕士，讲师，主要从事水泥水化特性研究。E-mail:1377341647@qq.com

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