Article(id=1311351049009590559, tenantId=1146029695717560320, journalId=1146123346816638986, issueId=1311351048585965854, articleNumber=null, orderNo=null, doi=10.13426/j.cnki.yky.2025.05.05, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1747584000000, receivedDateStr=2025-05-19, revisedDate=1750262400000, revisedDateStr=2025-06-19, acceptedDate=null, acceptedDateStr=null, onlineDate=1790580053807, onlineDateStr=2026-09-28, pubDate=1771516800000, pubDateStr=2026-02-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1790580053807, onlineIssueDateStr=2026-09-28, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1790580053807, creator=13701087609, updateTime=1790580053807, updator=13701087609, issue=Issue{id=1311351048585965854, tenantId=1146029695717560320, journalId=1146123346816638986, year='2026', volume='45', issue='1', pageStart='1', pageEnd='162', issueExtLink='null', onlineDate='null', pubDate='1771516800000', pubDateStr='2026-02-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1790580053706, creator='13701087609', updateTime=1790583944647, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1311367368429891870, tenantId=1146029695717560320, journalId=1146123346816638986, issueId=1311351048585965854, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1311367368429891871, tenantId=1146029695717560320, journalId=1146123346816638986, issueId=1311351048585965854, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=1, endPage=9, ext={EN=ArticleExt(id=1311351049236082976, articleId=1311351049009590559, tenantId=1146029695717560320, journalId=1146123346816638986, language=EN, title=Mechanical Properties and Pore Structure Evolution of Sandstone under Liquid Nitrogen Freezing and Thawing, columnId=1179340519550370065, journalTitle=Uranium Mining and Metallurgy, columnName=Cover Article, runingTitle=null, highlight=null, articleAbstract=

In order to further study the mechanical properties and pore structure evolution of sandstone under the action of liquid nitrogen freezing and thawing cycles, the sandstone in natural water-bearing state and saturated state were taken as the research object. The compressive strength, elastic modulus, pore T₂ map and nuclear magnetic porosity of sandstone after different liquid nitrogen freezing and thawing cycles were measured by nuclear magnetic resonance instrument and rock mechanics test system. The mechanical properties, porosity evolution and pore size distribution of sandstone under the action of liquid nitrogen were analyzed. Based on the SDR permeability model, the permeability change of sandstone after freezing and thawing cycles was calculated. The results show that the uniaxial compressive strength of sandstone decreases significantly after liquid nitrogen freezing treatment, and the decrease of strength increases with the increase of freezing and thawing cycles. When the number of cycles increases from 0 to 5, the decrease of compressive strength in natural state increases from 12.25% to 29.04%, while the maximum decrease of compressive strength of sandstone in saturated state is 55.50%. The results of nuclear magnetic resonance (NMR) test show that the freezing and thawing cycle of liquid nitrogen significantly increases the porosity and permeability of sandstone, especially for sandstone samples in saturated state. After five freezing and thawing cycles of liquid nitrogen, the porosity growth rate is 39.09%; and the permeability growth rate reaches 160%, which is 1.89 times that of natural water-bearing sandstone. The research results can provide a new idea for the efficient leaching of low permeability sandstone-type uranium deposits by liquid nitrogen fracturing technology.

, authors=Shiming ZHANG^{1, 2}, Qinqin WU³, Aiwu HUANG^{1, 2}, Yuting WANG^{1, 2}, Wenlei JIAO^{1, 2}, Lingling WU^{1, 2}, Lin HU^{1, 2}, Qing YU^{1, 2}, authorsList=Shiming ZHANG, Qinqin WU, Aiwu HUANG, Yuting WANG, Wenlei JIAO, Lingling WU, Lin HU, Qing YU, authorCompany=null, correspAuthors=Qing YU, 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=1311351049596793121, articleId=1311351049009590559, tenantId=1146029695717560320, journalId=1146123346816638986, language=CN, title=液氮冻融下砂岩力学特性及孔隙结构演化研究, columnId=1171165155376275591, journalTitle=铀矿冶, columnName=封面文章, runingTitle=null, highlight=null, articleAbstract=

为进一步研究液氮冻融循环作用下砂岩力学特性及其孔隙结构演化规律，以天然含水状态和饱水状态的砂岩为研究对象，采用核磁共振仪和岩石力学试验系统，测定了不同液氮冻融循环次数后砂岩的抗压强度、弹性模量、孔隙T₂图谱和核磁孔隙度，分析了液氮作用下砂岩的力学特性变化、孔隙度演化及孔径分布规律，并基于SDR渗透率模型，计算了砂岩冻融循环后的渗透率变化。结果表明：经液氮冷冻处理后，砂岩的单轴抗压强度显著降低；且随着冻融循环次数的增加，强度降低幅度逐渐增大，当循环次数由0次增至5次时，天然含水状态砂岩的抗压强度降低幅度由12.25%增至29.04%，而饱水状态砂岩的抗压强度最大降幅高达55.50%。核磁共振（NMR）测试结果显示，液氮冻融循环显著增加了砂岩的孔隙度和渗透率，经5次液氮冻融循环后，饱水状态砂岩样品的孔隙度增长率为39.09%、渗透率增长率达160%（是天然含水状态砂岩渗透率增长率的1.89倍）。研究结果可为液氮压裂技术在低渗透砂岩型铀矿的高效浸出提供新思路。

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