Article(id=1241421930797003128, tenantId=1146029695717560320, journalId=1240670690148397066, issueId=1241421928813089644, articleNumber=null, orderNo=null, doi=10.3963/j.issn.1001-487X.2025.02.005, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1740672000000, receivedDateStr=2025-02-28, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1773907652806, onlineDateStr=2026-03-19, pubDate=1748707200000, pubDateStr=2025-06-01, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1773907652806, onlineIssueDateStr=2026-03-19, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1773907652806, creator=13701087609, updateTime=1773907652806, updator=13701087609, issue=Issue{id=1241421928813089644, tenantId=1146029695717560320, journalId=1240670690148397066, year='2025', volume='42', issue='2', pageStart='1', pageEnd='210', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1773907652332, creator=13701087609, updateTime=1773908080242, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1241423723643859829, tenantId=1146029695717560320, journalId=1240670690148397066, issueId=1241421928813089644, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1241423723643859830, tenantId=1146029695717560320, journalId=1240670690148397066, issueId=1241421928813089644, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=44, endPage=51, ext={EN=ArticleExt(id=1241421931329679738, articleId=1241421930797003128, tenantId=1146029695717560320, journalId=1240670690148397066, language=EN, title=Experimental Study on Crack Propagation Characteristics of Blasting-Induced Fracturing in Low-permeability Coal Samples, columnId=1240702071733801442, journalTitle=Blasting, columnName=THEORETICAL AND TECHNOLOGICAL EXPLORATION, runingTitle=null, highlight=null, articleAbstract=
Pre-split blasting has emerged as a crucial technique for enhancing the permeability of low-permeability coal seams and improving gas drainage efficiency. While extensive research has focused on the effects of factors such as blast hole configuration, charge structure, charge coefficient, explosive quantity, and the propagation dynamics of blasting stress waves, limited attention has been given to fracture expansion characteristics through numerical simulations. Furthermore, experimental investigations into crack propagation remain scarce. This study addresses these gaps by examining low-permeability coal samples from a specific mine, employing small-dose coupled charge blasting technology combined with computerized tomography scanning technology. The experimental approach enabled the acquisition of macroscopic damage characteristics and three-dimensional crack distribution patterns post-blasting, facilitating an in-depth analysis of internal crack expansion under blasting stress. Key findings demonstrate the feasibility of utilizing detonating explosives instead of conventional explosives for small-scale coal sample blasting experiments with low-dose coupled charges. The results reveal that: (1) a larger blast hole diameter correlates with diminished crack propagation and permeability enhancement under constant charge quantity and tamping pressure; (2) tamped charges outperform loose charges when blast hole diameter and charge quantity are held constant; (3) an optimal charge quantity exists for fracture propagation, with excessive amounts proving counterproductive. Specifically, for the standard-sized low-permeability coal samples examined, a charge quantity of 25 mg yielded optimal results, producing a crack volume ratio of 12.79% and a single crack volume of 20 135.03 mm, followed closely by a 20 mg charge.
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HAN Ying (1980-), male, born in Jinan city, Shandong Province, Ph. D, professor, mainly engaged in teaching and scientific research in the field of mine safety engineering, (E-mail)
hyhpu@hpu.edu.cn.
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预裂爆破是改善低透气性煤层渗透率、提高瓦斯抽采率的有效措施之一,众多学者研究视角多聚焦于爆破孔布置方式、装药结构、装药系数、装药量和爆破应力波传播过程等因素对预裂爆破效果的影响,少数学者采用数值模拟方法对爆破裂纹的扩展特征进行了探讨,目前针对裂纹扩展的相关试验研究少见报道。为有效考察爆破致裂效果,以某矿低透气性煤样为研究对象,采用小药量耦合装药爆破技术和计算机断层扫描技术,试验获取了煤样爆破后的宏观破坏特征及内部裂纹的三维分布效果,进而对爆破应力作用下煤样内部裂纹的扩展特征进行了深入探讨。研究表明:以起爆药代替常用炸药,采用小药量耦合装药爆破技术进行小尺寸煤样爆破致裂试验,是切实可行的。当装药量和压药压力相同时,炮孔直径越大,裂纹扩展和增透效果越差;当炮孔直径和装药量相同时,冲压装药效果优于松散装药。当炮孔直径和压药压力相同时,并非装药量越大裂纹扩展效果越好,存在一个合理的装药量区间;对于本文采用的低透气性标准尺寸煤样而言,当装药量为25 mg时,裂纹体积占比为12.79%,单个裂纹体积为20 135.03 mm3,裂纹扩展效果最佳,装药量为20 mg时效果次之。
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张飞燕(1978-),女,山西运城人,博士、教授,主要从事安全技术及工程领域的教学与科研工作,(E-mail)yanzi@hpu.edu.cn。
ZHANG Fei-yan (1978-), female, born in Yuncheng city, Shanxi Province, Ph. D, professor, mainly engaged in teaching and scientific research in the field of safety technology and engineering, (E-mail) yanzi@hpu.edu.cn.
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1a, 2, address=
1.a.College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
2.Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo 454003, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1241439649705554132, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, authorId=1241439649323872446, language=CN, stringName=张飞燕, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
1a, 2, address=
1.a.河南理工大学 安全科学与工程学院,焦作 454003
2.煤炭安全生产与清洁高效利用省部共建协同创新中心,焦作 454003, bio={"content":"
张飞燕(1978-),女,山西运城人,博士、教授,主要从事安全技术及工程领域的教学与科研工作,(E-mail)yanzi@hpu.edu.cn。
ZHANG Fei-yan (1978-), female, born in Yuncheng city, Shanxi Province, Ph. D, professor, mainly engaged in teaching and scientific research in the field of safety technology and engineering, (E-mail) yanzi@hpu.edu.cn.
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张飞燕(1978-),女,山西运城人,博士、教授,主要从事安全技术及工程领域的教学与科研工作,(E-mail)yanzi@hpu.edu.cn。
ZHANG Fei-yan (1978-), female, born in Yuncheng city, Shanxi Province, Ph. D, professor, mainly engaged in teaching and scientific research in the field of safety technology and engineering, (E-mail) yanzi@hpu.edu.cn.
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1a, address=
1.a.College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1241439650057875697, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, authorId=1241439649797828824, language=CN, stringName=段笑颜, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
1a, address=
1.a.河南理工大学 安全科学与工程学院,焦作 454003, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1241439648564703377, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, xref=1.a., ext=[AuthorCompanyExt(id=1241439648581480597, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, companyId=1241439648564703377, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1b, 3, 4, address=
1.b.School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
3.Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region (Henan Province), Jiaozuo 454003, China
4.Science and Technology R&D Platform of Emergency Management Ministry for Deep Well Ground Control and Gas Extraction Technology, Jiaozuo 454003, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1241439650628301070, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, authorId=1241439650334699768, language=CN, stringName=韩颖, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
1b, 3, 4, address=
1.b.河南理工大学 能源科学与工程学院,焦作 454003
3.中原经济区煤层(页岩)气河南省协同创新中心,焦作 454003
4.深井岩层控制与瓦斯抽采技术应急管理部科技研发平台,焦作 454003, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1241439648686338201, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, xref=1.b., ext=[AuthorCompanyExt(id=1241439648724086938, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, companyId=1241439648686338201, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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4.深井岩层控制与瓦斯抽采技术应急管理部科技研发平台,焦作 454003)])])], keywords=[Keyword(id=1241439650858987807, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=EN, orderNo=1, keyword=low permeability coal seam), Keyword(id=1241439652511543596, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=EN, orderNo=2, keyword=blast cracking), Keyword(id=1241439652633178419, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=EN, orderNo=3, keyword=crack propagation), Keyword(id=1241439652754813240, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=EN, orderNo=4, keyword=coupled charge), Keyword(id=1241439652935168321, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=EN, orderNo=5, keyword=CT scanning), Keyword(id=1241439653044220231, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=CN, orderNo=1, keyword=低透气性煤层), Keyword(id=1241439653354598732, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=CN, orderNo=2, keyword=爆破致裂), Keyword(id=1241439653451067731, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=CN, orderNo=3, keyword=裂纹扩展), Keyword(id=1241439653534953819, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=CN, orderNo=4, keyword=耦合装药), Keyword(id=1241439653820166498, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=CN, orderNo=5, keyword=CT扫描)], refs=[Reference(id=1241439662703702600, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, doi=null, pmid=null, pmcid=null, year=1990, volume=null, issue=3, pageStart=9, pageEnd=14, url=null, language=null, rfNumber=[1], rfOrder=0, authorNames=高文学, journalName=爆破, refType=null, unstructuredReference=高文学. 非均质含裂隙岩体预裂爆破成缝的理论分析[J].
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1.b.河南理工大学 能源科学与工程学院,焦作 454003)]), AuthorCompany(id=1241439648937996455, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, xref=2., ext=[AuthorCompanyExt(id=1241439648946385062, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, companyId=1241439648937996455, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2.Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo 454003, China), AuthorCompanyExt(id=1241439648954773671, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, companyId=1241439648937996455, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2.煤炭安全生产与清洁高效利用省部共建协同创新中心,焦作 454003)]), AuthorCompany(id=1241439649042854060, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, xref=3., ext=[AuthorCompanyExt(id=1241439649051242669, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, companyId=1241439649042854060, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
3.Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region (Henan Province), Jiaozuo 454003, China), AuthorCompanyExt(id=1241439649059631282, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, companyId=1241439649042854060, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
3.中原经济区煤层(页岩)气河南省协同创新中心,焦作 454003)]), AuthorCompany(id=1241439649227403447, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, xref=4., ext=[AuthorCompanyExt(id=1241439649235792056, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, companyId=1241439649227403447, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
4.Science and Technology R&D Platform of Emergency Management Ministry for Deep Well Ground Control and Gas Extraction Technology, Jiaozuo 454003, China), AuthorCompanyExt(id=1241439649239986361, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, companyId=1241439649227403447, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
4.深井岩层控制与瓦斯抽采技术应急管理部科技研发平台,焦作 454003)])], figs=[ArticleFig(id=1241439654373814643, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=EN, label=Fig. 1, caption=
Compression mould for coal sample, figureFileSmall=ZbMnZgLUKNjUeh1mmyhejQ==, figureFileBig=hV0WlcmD+PrrIptIm8/UQw==, tableContent=null), ArticleFig(id=1241439654453506425, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=CN, label=图1, caption=
煤样压模模具, figureFileSmall=ZbMnZgLUKNjUeh1mmyhejQ==, figureFileBig=hV0WlcmD+PrrIptIm8/UQw==, tableContent=null), ArticleFig(id=1241439654587724168, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=EN, label=Fig. 2, caption=
Steel fixture, figureFileSmall=JpPnRMyQjEzgBMzQjdhmLw==, figureFileBig=q/LYdqz9y9gN56Ub0Tc7MA==, tableContent=null), ArticleFig(id=1241439654818410895, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=CN, label=图2, caption=
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Specifications of coal sample and borehole, figureFileSmall=YoSRJfapT3AoRPcEcGF7KQ==, figureFileBig=xw+6k6fBUYtGEfNZHYBr2A==, tableContent=null), ArticleFig(id=1241439655086846366, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=CN, label=图3, caption=
煤样及钻孔规格, figureFileSmall=YoSRJfapT3AoRPcEcGF7KQ==, figureFileBig=xw+6k6fBUYtGEfNZHYBr2A==, tableContent=null), ArticleFig(id=1241439655187509670, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=EN, label=Fig. 4, caption=
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试验设备和材料, figureFileSmall=mBhU6s1SpEyGtNupdkn2fw==, figureFileBig=whbjrGE4vEedo16Rk7u51w==, tableContent=null), ArticleFig(id=1241439655476916658, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=EN, label=Fig. 5, caption=
Coal sample for blasting experiment, figureFileSmall=vOynNZCW/z+JKMTPZDFjFA==, figureFileBig=8g0bGrOquPez0UeJou0nfg==, tableContent=null), ArticleFig(id=1241439656991060412, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=CN, label=图5, caption=
爆破试验用煤样, figureFileSmall=vOynNZCW/z+JKMTPZDFjFA==, figureFileBig=8g0bGrOquPez0UeJou0nfg==, tableContent=null), ArticleFig(id=1241439657355964867, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=EN, label=Fig. 6, caption=
Cracking effect of coal sample, figureFileSmall=XnBJGGvb2G/AHNImJYRQog==, figureFileBig=a7Y4geC2v2DxrcSCkY6ekA==, tableContent=null), ArticleFig(id=1241439657465016776, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=CN, label=图6, caption=
煤样爆破致裂效果, figureFileSmall=XnBJGGvb2G/AHNImJYRQog==, figureFileBig=a7Y4geC2v2DxrcSCkY6ekA==, tableContent=null), ArticleFig(id=1241439657569874383, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=EN, label=Fig. 7, caption=
CT scan results of coal samples before and after blasting, figureFileSmall=Z7U7digFc6eG7A/rzzNlzQ==, figureFileBig=pt2l+A6bcAPWAvxHOl2NJA==, tableContent=null), ArticleFig(id=1241439657930584535, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=CN, label=图7, caption=
爆破前后煤样CT扫描结果, figureFileSmall=Z7U7digFc6eG7A/rzzNlzQ==, figureFileBig=pt2l+A6bcAPWAvxHOl2NJA==, tableContent=null), ArticleFig(id=1241439658115133917, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=EN, label=Fig. 8, caption=
Three-dimensional distribution effect of cracks in coal samples, figureFileSmall=/FBAItVTTYi7uTqrUVnzmw==, figureFileBig=rUqIbvY6srmW4qpTymbVHQ==, tableContent=null), ArticleFig(id=1241439658303877604, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=CN, label=图8, caption=
煤样裂纹三维分布效果图, figureFileSmall=/FBAItVTTYi7uTqrUVnzmw==, figureFileBig=rUqIbvY6srmW4qpTymbVHQ==, tableContent=null), ArticleFig(id=1241439658404540903, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=EN, label=Table 1, caption=
Test results of coalbed gas content
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| 采样地点Sampling position | 上覆有效地层厚度Effective thickness of overlying layer/m | 采样深度Sampling depth/m | 煤层厚度Thickness of coal seam/m | 瓦斯组分Gas component/% | 煤层瓦斯含量Gas content/ m3·(t.daf)-1 |
|---|
| CO2 | CH4 | N2 | CO2 | CH4 | N2 |
|---|
| 7305 | 253.80 | 917.41 | 6.35 | | | | 0.31 | 15.36 | 1.40 |
| 8006 | 121.81 | 652.28 | 5.41 | 9.24 | 7.83 | 82.93 | 0.50 | 0.52 | 0.23 |
| 12201 | 170.26 | 809.20 | 5.59 | 28.50 | 0 | 71.50 | 0.37 | 0.00 | 0.93 |
| 12603 | 163.83 | 848.83 | 6.63 | 3.53 | 81.25 | 15.23 | 0.66 | 15.11 | 2.83 |
| 12605 | 95.14 | 1047.52 | 6.01 | 10.52 | 42.57 | 46.91 | 1.01 | 4.09 | 4.51 |
| 12800 | 112.15 | 699.48 | 5.73 | 11.68 | 53.61 | 34.71 | 0.96 | 4.40 | 2.85 |
| 12801 | 74.47 | 777.95 | 6.95 | 2.57 | 64.13 | 33.30 | 0.62 | 3.22 | 0.47 |
| 13801 | 230.96 | 1035.83 | 6.47 | 5.40 | 86.62 | 7.98 | 0.69 | 11.00 | 1.01 |
), ArticleFig(id=1241439658526175723, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=CN, label=表1, caption=
煤层瓦斯含量测试结果表
, figureFileSmall=null, figureFileBig=null, tableContent=
| 采样地点Sampling position | 上覆有效地层厚度Effective thickness of overlying layer/m | 采样深度Sampling depth/m | 煤层厚度Thickness of coal seam/m | 瓦斯组分Gas component/% | 煤层瓦斯含量Gas content/ m3·(t.daf)-1 |
|---|
| CO2 | CH4 | N2 | CO2 | CH4 | N2 |
|---|
| 7305 | 253.80 | 917.41 | 6.35 | | | | 0.31 | 15.36 | 1.40 |
| 8006 | 121.81 | 652.28 | 5.41 | 9.24 | 7.83 | 82.93 | 0.50 | 0.52 | 0.23 |
| 12201 | 170.26 | 809.20 | 5.59 | 28.50 | 0 | 71.50 | 0.37 | 0.00 | 0.93 |
| 12603 | 163.83 | 848.83 | 6.63 | 3.53 | 81.25 | 15.23 | 0.66 | 15.11 | 2.83 |
| 12605 | 95.14 | 1047.52 | 6.01 | 10.52 | 42.57 | 46.91 | 1.01 | 4.09 | 4.51 |
| 12800 | 112.15 | 699.48 | 5.73 | 11.68 | 53.61 | 34.71 | 0.96 | 4.40 | 2.85 |
| 12801 | 74.47 | 777.95 | 6.95 | 2.57 | 64.13 | 33.30 | 0.62 | 3.22 | 0.47 |
| 13801 | 230.96 | 1035.83 | 6.47 | 5.40 | 86.62 | 7.98 | 0.69 | 11.00 | 1.01 |
), ArticleFig(id=1241439658672976368, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=EN, label=Table 2, caption=
Blasting charge parameters
, figureFileSmall=null, figureFileBig=null, tableContent=
| 样品编号Sample number | 1# | 2# | 3# | 4# | 5# | 6# | 7# | 8# | 9# |
|---|
| 孔径Pore size ϕ/mm | 4 | 4 | 4 | 6 | 4 | 4 | 4 | 4 | 6 |
| 起爆药质量Quality of primary explosive/mg | 100 | 30 | 20 | 20 | 15 | 25 | 35 | 30 | 25 |
| 压药压力Loading pressure/MPa | 30 | 30 | 30 | 松散 | 30 | 30 | 30 | 松散 | 30 |
| 药柱高度Height of explosive column/mm | 5.70 | 1.70 | 1.26 | 无 | 0.91 | 1.52 | 2.09 | 无 | 0.77 |
), ArticleFig(id=1241439658773639665, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=CN, label=表2, caption=
压药参数表
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| 样品编号Sample number | 1# | 2# | 3# | 4# | 5# | 6# | 7# | 8# | 9# |
|---|
| 孔径Pore size ϕ/mm | 4 | 4 | 4 | 6 | 4 | 4 | 4 | 4 | 6 |
| 起爆药质量Quality of primary explosive/mg | 100 | 30 | 20 | 20 | 15 | 25 | 35 | 30 | 25 |
| 压药压力Loading pressure/MPa | 30 | 30 | 30 | 松散 | 30 | 30 | 30 | 松散 | 30 |
| 药柱高度Height of explosive column/mm | 5.70 | 1.70 | 1.26 | 无 | 0.91 | 1.52 | 2.09 | 无 | 0.77 |
), ArticleFig(id=1241439659029492215, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241421930797003128, language=EN, label=Table 3, caption=
Internal crack parameters of coal samples after blasting
, figureFileSmall=null, figureFileBig=null, tableContent=
| 样品编号Sample number | 炮孔直径Blasthole diameter/ mm | 起爆药质量Quality of primary explosive/ mg | 压药压力Loading pressure/ MPa | 裂纹体积占比Volume ratio of crack/ % | 独立裂纹个数Number of independent cracks/个 | 最大裂纹体积Maximum crack volume/ mm3 |
|---|
| 1 | 4 | 100 | 30 | 9.33 | 3812 | 10 266.58 |
| 2 | 4 | 30 | 30 | 7.45 | 31 830 | 10 944.85 |
| 3 | 4 | 20 | 30 | 12.05 | 8183 | 19 932.88 |
| 4 | 6 | 20 | 松散 | 2.93 | 50 460 | 2503.76 |
| 5 | 4 | 15 | 30 | 9.02 | 12 892 | 13 399.06 |
| 6 | 4 | 25 | 30 | 12.79 | 6212 | 20 135.03 |
| 7 | 4 | 35 | 30 | 9.79 | 5843 | 15 890.50 |
| 8 | 4 | 30 | 松散 | 5.65 | 8311 | 9285.81 |
| 9 | 6 | 25 | 30 | 3.21 | 5485 | 4659.82 |
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爆破后煤样内部裂纹参数表
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| 样品编号Sample number | 炮孔直径Blasthole diameter/ mm | 起爆药质量Quality of primary explosive/ mg | 压药压力Loading pressure/ MPa | 裂纹体积占比Volume ratio of crack/ % | 独立裂纹个数Number of independent cracks/个 | 最大裂纹体积Maximum crack volume/ mm3 |
|---|
| 1 | 4 | 100 | 30 | 9.33 | 3812 | 10 266.58 |
| 2 | 4 | 30 | 30 | 7.45 | 31 830 | 10 944.85 |
| 3 | 4 | 20 | 30 | 12.05 | 8183 | 19 932.88 |
| 4 | 6 | 20 | 松散 | 2.93 | 50 460 | 2503.76 |
| 5 | 4 | 15 | 30 | 9.02 | 12 892 | 13 399.06 |
| 6 | 4 | 25 | 30 | 12.79 | 6212 | 20 135.03 |
| 7 | 4 | 35 | 30 | 9.79 | 5843 | 15 890.50 |
| 8 | 4 | 30 | 松散 | 5.65 | 8311 | 9285.81 |
| 9 | 6 | 25 | 30 | 3.21 | 5485 | 4659.82 |
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