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Aiming at the problems of water-induced cracking and insufficient durability of steel fiber reinforced concrete support in the roadway of a certain iron mine in Yunnan, based on the three-factor and three-level orthogonal test design, water absorption rate and sulfate erosion resistance tests were systematically carried out, and the influence laws of water-cement ratio (0.42, 0.45, 0.47), steel fiber content (2%, 3%, 4%) and waterproofing agent content (0.10, 0.12, 0.14) on water absorption rate and sulfate erosion resistance performance were quantitatively analyzed to optimize the water durability of the materials, and the optimal proportion was applied to the actual roadway support of the certain iron mine in Yunnan for construction verification. The results show that the water absorption rate of steel fiber reinforced concrete under various optimized proportions is relatively low, and the content of waterproofing agent has the most significant effect on water absorption rate (with a range of 1.73%). When the content of waterproofing agent is 0.14, the water absorption rate decreases to 4.69%. In the sulfate erosion resistance tests, the mass loss ratios of specimens are all negative (-0.35%--0.14%), the compressive strength increases with the increase in the number of cyclic erosion times, and the content of waterproofing agent has the most significant effect on compressive strength (with a range of 22.7 MPa). Proportion 2 (with a water-cement ratio of 0.42, 3% steel fiber content and 0.14 waterproofing agent content) exhibits the best comprehensive performance, with a water absorption rate of 4.54%. Its compressive strength increases from the initial 70.6 MPa to 83.1 MPa, with an increase of 17.6%. Field application results show that after support with Proportion 2, the displacement of two sides of the roadway stabilizes at 25 mm, with no significant leakage on the surface, which verifies the feasibility of the optimized proportion.

, authors=Ping SHUAI, Junzhi CHEN, authorsList=Ping SHUAI, Junzhi CHEN, authorCompany=null, correspAuthors=Junzhi CHEN, 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=1322559873527689534, articleId=1322559872986624316, tenantId=1146029695717560320, journalId=1225396423026438145, language=CN, title=某铁矿巷道钢纤维混凝土支护遇水耐久性优化研究, columnId=1226462295417598973, journalTitle=矿业研究与开发, columnName=矿山安全与环保, runingTitle=null, highlight=null, articleAbstract=

针对云南某铁矿巷道钢纤维混凝土支护遇水开裂、耐久性不足的问题，基于三因素三水平正交试验设计，系统开展吸水率与抗硫酸盐侵蚀试验，定量分析水灰比（0.42、0.45、0.47）、钢纤维掺量（2%、3%、4%）及防水剂掺量（0.10、0.12、0.14）对吸水率与抗硫酸盐侵蚀性能的影响规律，以优化材料的遇水耐久性，并将最优配比应用于云南某铁矿实际巷道支护中进行施工检验。结果表明：各优化配比下的钢纤维混凝土吸水率均较低，防水剂掺量对吸水率的影响最为显著（极差1.73%），掺量为0.14时吸水率降至4.69%。抗硫酸盐侵蚀中试块质量损失比均为负值（-0.35%~-0.14%），抗压强度随着循环侵蚀次数的增加而提高，防水剂掺量对抗压强度影响最大（极差22.7 MPa）；配比2（水灰比0.42、钢纤维3%、防水剂0.14）综合性能最优，吸水率4.54%，抗压强度由初始70.6 MPa增至83.1 MPa，提升了17.6%。现场应用结果表明，采用配比2支护后巷道两帮位移稳定于25 mm，表面无显著渗漏，验证了优化后配比的可行性。

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帅平（1999—），男，贵州遵义人，硕士研究生，主要从事矿山岩体力学方面的研究。E-mail:19862523608@163.com

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帅平（1999—），男，贵州遵义人，硕士研究生，主要从事矿山岩体力学方面的研究。E-mail:19862523608@163.com

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