Article(id=1322559986664849627, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1322559951067792299, 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=1745510400000, receivedDateStr=2025-04-25, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1793252472797, onlineDateStr=2026-10-29, pubDate=1777046400000, pubDateStr=2026-04-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793252472797, onlineIssueDateStr=2026-10-29, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793252472797, creator=13701087609, updateTime=1793252472797, updator=13701087609, issue=Issue{id=1322559951067792299, tenantId=1146029695717560320, journalId=1225396423026438145, year='2026', volume='46', issue='4', pageStart='1', pageEnd='294', issueExtLink='null', onlineDate='null', pubDate='1777046400000', pubDateStr='2026-04-25', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793252464310, creator='13701087609', updateTime=1793252763065, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1322561204200001631, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1322559951067792299, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1322561204200001632, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1322559951067792299, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=138, endPage=148, ext={EN=ArticleExt(id=1322559986832621788, articleId=1322559986664849627, tenantId=1146029695717560320, journalId=1225396423026438145, language=EN, title=Crack Propagation Law of Roof Sandstone and Loading Rate Effect of Fracture Behavior, columnId=null, journalTitle=Mining Research and Development, columnName=null, runingTitle=null, highlight=null, articleAbstract=

To reveal the loading rate effect of roof fracture behavior, typical mine roof sandstone was taken as the research object. Brazilian splitting tests of five loading rate levels were carried out in the loading rate range of 0.001-10 kN/s. The mechanical behaviors such as tensile strength, fracture characteristics, initiation stress, acoustic emission characteristics and fracture microstructure were analyzed. Based on the distribution of acoustic emission sources, the evolution law of internal damage cracks in the samples under different loading rates was explored. The results show that the tensile strength increases by 0.64 MPa when the loading rate increases by one order of magnitude, but the ratio of crack initiation stress to tensile strength decreases. With the increase of loading rate, this ratio is 40.13%, 36.59%, 32.53%, 26.17% and 15.81% in sequence. When the loading rate increases by one order of magnitude, the average size of the fragments decreases by 0.229 mm, the degree of fragmentation increases, and the size distribution of the fragments develops towards homogenization. The acoustic emission source at low loading rate mainly appears along the macroscopic fracture surface, while at high loading rate, the distribution of acoustic emission source is more dispersed due to the initiation and propagation of cracks from multiple dispersed stress concentration areas. With the increase of loading rate, the transgranular phenomenon at the fracture surface becomes more and more significant, transitioning from a single crack and straight form at low loading rates to multiple cracks and complex forms at high loading rates.

, authors=Zhenhua ZHAO^{1, 2}, Hongjie SUN^{1, 2}, Lin HAN^{1, 2}, Zhenjiang LUO^{1, 2}, Zhenlong ZHAO³, Hailong WANG^{1, 2, 3, 4}, authorsList=Zhenhua ZHAO, Hongjie SUN, Lin HAN, Zhenjiang LUO, Zhenlong ZHAO, Hailong WANG, authorCompany=null, correspAuthors=Hailong WANG, 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=1322559987071697117, articleId=1322559986664849627, tenantId=1146029695717560320, journalId=1225396423026438145, language=CN, title=顶板砂岩裂纹扩展规律及断裂行为的加载速率效应, columnId=1226462295417598973, journalTitle=矿业研究与开发, columnName=矿山安全与环保, runingTitle=null, highlight=null, articleAbstract=

为揭示顶板断裂行为的加载速率效应，以典型矿井顶板砂岩为研究对象，在0.001~10 kN/s的加戴速率范围内开展了5个加载速率等级的巴西劈裂试验，分析了抗拉强度、破碎特征、起裂应力、声发射特性、断口微观形貌等力学行为，并基于声发射震源分布，探讨了不同加载速率下试样内部损伤裂纹的演化规律。结果表明，加载速率每增大10倍，抗拉强度增加0.64 MPa，但起裂应力与抗拉强度的比值减小，随加载速率增大，该比值依次为40.13%、36.59%、32.53%、26.17%、15.81%；加载速率每增大10倍，碎块平均尺寸减小0.229 mm，破碎程度增大，碎块尺寸分布向均匀化发展；低加载速率下的声发射震源主要沿宏观断裂面出现，而高加载速率下由于裂纹从多个分散的应力集中区萌生和扩展，声发射震源的分布较分散；随加载速率的增大，断口处的穿晶现象越来越显著，从低加载速率下的单裂隙、平直形式，向高加载速率下的多裂隙、复杂形式转变。

, authors=赵振华^{1, 2}, 孙虹洁^{1, 2}, 韩琳^{1, 2}, 罗振江^{1, 2}, 赵振龙³, 王海龙^{1, 2, 3, 4}, authorsList=赵振华, 孙虹洁, 韩琳, 罗振江, 赵振龙, 王海龙, authorCompany=null, correspAuthors=王海龙, authorNote=, correspAuthorsNote=, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=NkT0sAGTpRBgiK2RRaaejQ==, magXml=BQtqyJlNWFA4uWwDSMaX2A==, pdfUrl=null, pdf=kC68H3DiHbeLhR3gWwJsOw==, pdfFileSize=3609061, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=gZDj7aPZB0uU4cZSGWEMYA==, mapNumber=null, fund=null)}, authors=[Author(id=1322559987713425643, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322559986664849627, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=16607713@qq.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1322559988007026926, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322559986664849627, authorId=1322559987713425643, language=EN, stringName=Zhenhua ZHAO, firstName=Zhenhua, middleName=null, lastName=ZHAO, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=^{1, 2}, address=^1.Shandong Provincial Geo-mineral Engineering Exploration Institute (801 Hydrogeology and Engineering Geology Brigade, Shandong Provincial Bureau of Geology and Mineral Resources), Jinan, Shandong 250014, China
^2.Shandong Engineering Research Center for Environmental Protection and Remediation on Groundwater, Jinan, Shandong 250014, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1322559988078330095, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322559986664849627, authorId=1322559987713425643, language=CN, stringName=赵振华, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=^{1, 2}, address=^1．山东省地矿工程勘察院（山东省地质矿产勘查开发局八○一水文地质工程地质大队），山东 济南　250014
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赵振华（1982—），男，山东潍坊人，硕士，正高级工程师，主要从事水文地质和环境地质研究工作。E-mail:16607713@qq.com

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赵振华（1982—），男，山东潍坊人，硕士，正高级工程师，主要从事水文地质和环境地质研究工作。E-mail:16607713@qq.com

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