Article(id=1321866340361687809, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1321866297609146910, 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=1761840000000, receivedDateStr=2025-10-31, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1793087094631, onlineDateStr=2026-10-27, pubDate=1779638400000, pubDateStr=2026-05-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793087094631, onlineIssueDateStr=2026-10-27, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793087094631, creator=13701087609, updateTime=1793087094631, updator=13701087609, issue=Issue{id=1321866297609146910, tenantId=1146029695717560320, journalId=1225396423026438145, year='2026', volume='46', issue='5', pageStart='1', pageEnd='312', issueExtLink='null', onlineDate='null', pubDate='1779638400000', pubDateStr='2026-05-25', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793087084438, creator='13701087609', updateTime=1793094562481, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1321897662853533805, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1321866297609146910, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1321897662853533806, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1321866297609146910, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=173, endPage=184, ext={EN=ArticleExt(id=1321866340554625794, articleId=1321866340361687809, tenantId=1146029695717560320, journalId=1225396423026438145, language=EN, title=Variation Law of Seepage Characteristics of Coal Fractures Under True Triaxial Hydraulic Fracturing with Ammonium Persulfate, columnId=null, journalTitle=Mining Research and Development, columnName=null, runingTitle=null, highlight=null, articleAbstract=

Coal permeability directly affects the efficiency of gas extraction. Using the multiphase and multifield true triaxial dynamic seepage test system of coal and rock, combined with acoustic emission monitoring, ultrasonic testing and high-resolution image processing, the fracture structure and permeability evolution of in-situ coal subjected to hydraulic fracturing with low-concentration ammonium persulfate were investigated, and the influence mechanism of five groups of different liquid injection rates and pressure injection spaces (the action space between fracturing fluid and coal wall in the open hole section) was quantitatively analyzed. The results show that the larger the liquid injection rate is, the shorter the time required for coal to fracture is, the larger the pressure injection space is, the lower the coal fracture pressure is, and the 4-hole fracturing tube (the largest pressure injection space) has the most acoustic emission positioning points and the widest distribution. After hydraulic fracturing, the ultrasonic velocity of five groups of coal samples decreased. Compared with water fracturing, the coal fractured with ammonium persulfate has fewer acoustic emission positioning points (lower damage), but the oxidation and dissolution of ammonium persulfate can further improve the degree of fracture development, and the effect is better in improving coal permeability. Under the same conditions, the larger the pressure injection space is, the wider the range of coal fracture penetration and ammonium persulfate action is, and the more significant the permeability improvement is. When the pressure injection space is the same, the lower the liquid injection rate, the better the permeability improvement effect. The synergistic effect of oxidation dissolution of ammonium persulfate and hydraulic fracturing can promote the expansion of coal fracture network, and the pressure injection space affects the fracture expansion range and density. The research results can provide theoretical guidance for the modification of seepage characteristics of low permeability coal seams.

, authors=Chunshan Zheng^{1, 2, 3}, Shilong Fu², Sheng Xue^{1, 3}, Bingyou Jiang^{1, 2}, Feilin Han³, Bo Ren⁴, Yang Zhao², authorsList=Chunshan Zheng, Shilong Fu, Sheng Xue, Bingyou Jiang, Feilin Han, Bo Ren, Yang Zhao, authorCompany=null, correspAuthors=null, 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=1321866340785312515, articleId=1321866340361687809, tenantId=1146029695717560320, journalId=1225396423026438145, language=CN, title=过硫酸铵真三轴水力压裂煤体裂隙渗流特性变化规律, columnId=1226462295417598973, journalTitle=矿业研究与开发, columnName=矿山安全与环保, runingTitle=null, highlight=null, articleAbstract=

煤体渗透率直接影响瓦斯抽采效率。采用煤岩多相多场真三轴动态渗流试验系统，结合声发射监测、超声波测试和高分辨率图像处理等手段，研究了低浓度过硫酸铵水力压裂原位煤体的裂隙结构和渗透率变化规律，并量化分析了5组不同注液速率和压注空间（压裂液与裸眼段煤壁的作用空间）的影响机制。结果表明：注液速率越大，煤体破裂所需时间越短，压注空间越大，煤体破裂压力越低，4孔压裂管（压注空间最大）煤样声发射定位点最多且分布最广；水力压裂后5组煤样超声波速均降低，与清水压裂相比，过硫酸铵压裂煤体声发射定位点更少（损伤更低），但过硫酸铵氧化溶蚀作用可进一步提升裂隙发育程度，在改善煤体渗透率方面效果更优。相同条件下压注空间越大，煤体裂缝贯通及过硫酸铵作用范围越广，渗透率提升越显著；压注空间相同时，注液速率越低，渗透率改善效果越好。过硫酸铵的氧化溶蚀与水力压裂致裂协同作用可促进煤体裂隙网络扩展，而压注空间影响裂隙扩展范围和密度。研究结果可为低渗煤层渗流特性改造提供理论指导。

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郑春山（1989—），男，安徽淮南人，博士，教授，主要研究方向为矿井瓦斯抽采理论与技术。E-mail: chunshanzheng@aust.edu.cn

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郑春山（1989—），男，安徽淮南人，博士，教授，主要研究方向为矿井瓦斯抽采理论与技术。E-mail: chunshanzheng@aust.edu.cn

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