Article(id=1322559799670190787, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1322559792544072145, articleNumber=null, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1734364800000, receivedDateStr=2024-12-17, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1793252428214, onlineDateStr=2026-10-29, pubDate=1769270400000, pubDateStr=2026-01-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793252428214, onlineIssueDateStr=2026-10-29, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793252428214, creator=13701087609, updateTime=1793252428214, updator=13701087609, issue=Issue{id=1322559792544072145, tenantId=1146029695717560320, journalId=1225396423026438145, year='2026', volume='46', issue='1', pageStart='1', pageEnd='306', issueExtLink='null', onlineDate='null', pubDate='1769270400000', pubDateStr='2026-01-25', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793252426515, creator='13701087609', updateTime=1793252675339, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1322560836246286849, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1322559792544072145, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1322560836246286850, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1322559792544072145, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=60, endPage=68, ext={EN=ArticleExt(id=1322559799825380036, articleId=1322559799670190787, tenantId=1146029695717560320, journalId=1225396423026438145, language=EN, title=Thickness Optimization of Horizontal Isolated Pillar in Vertical Zonal Mining from Open-Pit to Underground, columnId=null, journalTitle=Mining Research and Development, columnName=null, runingTitle=null, highlight=null, articleAbstract=

To achieve the mining production capacity of 15 million tons per annum for the transition of open-pit to underground mining project of Sijiaying Iron Mine, the vertical zonal mining method was adopted, and a horizontal isolated pillar was required between the upper and lower mining areas. For improving the overall stability of the mining area, FLAC3D numerical simulation method was used to investigate the evolution characteristics of the stress field, the development law of deformation and failure, and the influence of the horizontal isolation pillar thickness on the surface settlement deformation of the open pit under five different thicknesses. Finally, the safety thickness of horizontal isolated pillar in this mine was determined to be 18 m. The results are concluded as follows. Firstly, with the increase of the thickness of the horizontal isolation pillar, the concentrated stress in the pillar decreases significantly, the distribution of the maximum principal stress tends to be uniform, and the distribution range of tensile stress decreases significantly, mainly in the stope part of the mining panel. Secondly, in the horizontal isolated pillar, the displacement presents an obvious nonlinear decreasing change law with the increase of the pillar thickness. The larger displacement occurs at the position where the pillar is close to the hanging wall of the orebody. When the pillar thickness is 18 m, the maximum displacement is 36.2 mm. Thirdly, the volume of the plastic zone in the pillar shows a nonlinear decreasing trend as the thickness of the horizontal isolation pillar increases. When the pillar thickness is 16 m, the plastic zone is no longer connected. In comparison, when the pillar thickness reaches 18 m, only a small amount of plastic failure occurs locally, and the isolated pillar is in a safe state. Finally, the deformation and settlement amount of the open pit surface gradually decreases with the increase of the thickness of the horizontal isolated pillar, and the position where the maximum displacement occurs is the same as the one where the maximum displacement occurs in the isolated pillar. When the pillar thickness is 18 m, the surface settlement amount of the open pit is 10.8 mm, indicating a good stability.

, authors=Ruijie GONG¹, Huishi YE², Jie ZHANG³, Qiangying MA⁴, Zengxiang LU⁴, Jiaoqun LI⁴, authorsList=Ruijie GONG, Huishi YE, Jie ZHANG, Qiangying MA, Zengxiang LU, Jiaoqun LI, authorCompany=null, correspAuthors=Zengxiang LU, 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=1322559801712816837, articleId=1322559799670190787, tenantId=1146029695717560320, journalId=1225396423026438145, language=CN, title=露天转地下纵向分区开采的水平隔离矿柱厚度优化, columnId=1226462294490657775, journalTitle=矿业研究与开发, columnName=采矿与矿山充填, runingTitle=null, highlight=null, articleAbstract=

司家营铁矿露天转地下开采工程为实现1 500万t/a的采矿生产能力，采用了纵向分区开采方式，上、下采区之间需留设水平隔离矿柱。为提高矿区开采的整体稳定性，采用FLAC3D数值模拟方法，研究了5种不同厚度水平隔离矿柱内的应力场演化特征、变形破坏发展规律和隔离矿柱厚度对露天坑地表沉降变形的影响，最终确定了该矿水平隔离矿柱的安全厚度为18 m。结果表明:（1）随水平隔离矿柱厚度的增大，矿柱内集中应力显著减小，最大主应力分布趋于均匀，拉应力分布范围显著减小，主要分布在开采盘区的采场部位；（2）水平隔离矿柱内位移随着矿柱厚度的增加呈现出明显的非线性递减变化规律，较大位移产生于矿柱靠近矿体上盘的位置，当矿柱厚度为18 m时，最大位移为36.2 mm；（3）矿柱内塑性区体积随着水平隔离矿柱厚度的增大呈非线性减小的趋势，当矿柱厚度为16 m时，塑性区不再连通，而当矿柱厚度达到18 m时，仅在局部出现少量塑性破坏，隔离矿柱处于安全状态；（4）露天坑表面的变形沉降量随矿柱厚度的增大逐渐减小，最大位移产生的部位与隔离矿柱发生最大位移的部位一致，当矿柱厚度为18 m时，露天坑表面沉降量为10.8 mm，稳定性良好。

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巩瑞杰（1983—），男，河北霸州人，高级工程师，主要从事金属矿床开采方面的技术与管理。E-mail:425329952@qq.com

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巩瑞杰（1983—），男，河北霸州人，高级工程师，主要从事金属矿床开采方面的技术与管理。E-mail:425329952@qq.com

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