Article(id=1240631730214851383, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1240631729627648823, articleNumber=null, orderNo=null, doi=10.3969/j.issn.0253-6099.2024.03.004, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1703260800000, receivedDateStr=2023-12-23, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1773719254305, onlineDateStr=2026-03-17, pubDate=1717171200000, pubDateStr=2024-06-01, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1773719254305, onlineIssueDateStr=2026-03-17, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1773719254305, creator=13701087609, updateTime=1773719254305, updator=13701087609, issue=Issue{id=1240631729627648823, tenantId=1146029695717560320, journalId=1235980550691926019, year='2024', volume='44', issue='3', pageStart='1', pageEnd='181', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1773719254166, creator=13701087609, updateTime=1773724083554, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1240651985603580488, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1240631729627648823, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1240651985603580489, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1240631729627648823, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=16, endPage=21, ext={EN=ArticleExt(id=1240631730504258361, articleId=1240631730214851383, tenantId=1146029695717560320, journalId=1235980550691926019, language=EN, title=Influence of Stemming Length on Damage Effect of Rock Blasting, columnId=1236276106018484431, journalTitle=Mining and Metallurgical Engineering, columnName=MINING, runingTitle=null, highlight=null, articleAbstract=
The numerical simulation was used to establish a single-hole blasting model, which was then used to simulate the blasting effect with different stemming length. Otsu thresholding technique was adopted for image segmentation, and the data, such as percentage of cracked rock area, fractal dimension of pore structure, and fragmentation of rock mass, were extracted for comparative analysis, so as to explore the influence of stemming length on damage effect under deep-hole blasting. The results show that fractal dimension and percentage of cracked rock area are in an uptrend before falling down as stemming length increases. The fractal dimension reaches the maximum value with stemming length of 3.0 m, and the percentage of cracked rock area reaches the maximum value with stemming length of 1.7 m. Stemming length of 2.2 m can bring the highest number of fragments, and stemming length of 2.0 m can result in the smallest average area of fragments. It is found that the blasting with the stemming length of 2.0-2.2 m can lead to better rock fragmentation effect. As the stemming length increases, the flyrock becomes bigger, and the displacement distance decreases. The research results can be taken as reference in selection of stemming parameters for blasting operation.
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采用数值模拟方法建立单孔装药的爆破模型,采取不同填塞长度模拟并利用Otsu算法进行阈值分割后,提取岩体的破裂面积比、孔隙分形维数、块度数据等进行对比分析,研究填塞长度对深孔爆破损伤效果的影响。结果表明,分形维数和破裂面积比随填塞长度增加呈现先增后降的变化趋势,填塞长度3.0 m时分形维数达到最大值,填塞长度1.7 m时破裂面积比达到极大值。填塞长度2.2 m左右时碎块数量取得最大值,填塞长度2.0 m时碎块平均面积为最小,填塞长度2.0~2.2 m时可达到较优的岩石破碎效果。随着填塞长度增加,抛出的岩石从小块为主转向大块,位移距离降低。研究成果对爆破作业填塞参数选取具有一定参考价值。
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魏可心(1998—),女,山东济宁人,硕士研究生,主要从事工程爆破方面的研究。E-mail:weikexin13@163.com
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魏可心(1998—),女,山东济宁人,硕士研究生,主要从事工程爆破方面的研究。E-mail:weikexin13@163.com
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爆破模拟结果与现场实际爆破断面比较(a)爆破模拟结果;(b)现场实际爆破断面
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填塞长度1 m时岩石爆破裂纹扩展(a)t=1 ms;(b)t=2 ms;(c)t=3 ms;(d)t=4 ms;(e)t=10 ms;(f)t=20 ms
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不同填塞长度下爆破岩石裂纹分布(a)SL=1 m;(b)SL=2 m;(c)SL=3 m;(d)SL=4 m
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爆破岩石裂纹图像处理结果(a)分形维数;(b)破裂面积比
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岩石爆破块度着色(a)SL=1 m;(b)SL=2 m;(c)SL=3 m;(d)SL=4 m
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不同填塞长度下岩石爆破碎块面积统计分析(a)A>1 m2;(b)A>0.5 m2;(c)A>0.1 m2;(d)A>0 m2
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不同填塞长度下岩石爆破碎块面积占比(a)SL=1 m;(b)SL=2 m;(c)SL=3 m;(d)SL=4 m
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不同填塞长度下岩石的抛出情况(a)SL=1 m;(b)SL=2 m;(c)SL=3 m;(d)SL=4 m
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不同填塞长度下爆破岩石监测点位移变化(a)A点;(b)B点;(c)C点
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不同填塞长度下爆破岩石监测点速度变化(a)A点;(b)B点;(c)C点
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| 密度/(kg·m-3) | 爆速/(m·s-1) | Pc-j/GPa | A/GPa | B/GPa | R1 | R2 | ω | E0/GPa |
|---|
| 1 300 | 4 100 | 5.15 | 215 | 0.184 | 4.16 | 0.92 | 0.15 | 4.2 |
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炸药材料模型参数
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| 密度/(kg·m-3) | 爆速/(m·s-1) | Pc-j/GPa | A/GPa | B/GPa | R1 | R2 | ω | E0/GPa |
|---|
| 1 300 | 4 100 | 5.15 | 215 | 0.184 | 4.16 | 0.92 | 0.15 | 4.2 |
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| 密度/(kg·m-3) | C0/MPa | C1/MPa | C2/MPa | C3/MPa | C4/MPa | C5/MPa | C6/MPa | E0/MPa |
|---|
| 1.2 | 0 | 0 | 0 | 0 | 0.4 | 0.4 | 0 | 0.25 |
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空气材料模型参数
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| 密度/(kg·m-3) | C0/MPa | C1/MPa | C2/MPa | C3/MPa | C4/MPa | C5/MPa | C6/MPa | E0/MPa |
|---|
| 1.2 | 0 | 0 | 0 | 0 | 0.4 | 0.4 | 0 | 0.25 |
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| 密度/(kg·m-3) | 杨氏模量/GPa | 泊松比 | 屈服应力/MPa | 切线模量/GPa | 应变率参数C | 应变率参数P | 失效应变fs | 抗压强度/MPa | 抗拉强度/MPa |
|---|
| 2 650 | 68 | 0.228 | 75 | 40 | 2.5 | 4 | 0.8 | 150 | 11.2 |
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岩石材料模型参数
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| 密度/(kg·m-3) | 杨氏模量/GPa | 泊松比 | 屈服应力/MPa | 切线模量/GPa | 应变率参数C | 应变率参数P | 失效应变fs | 抗压强度/MPa | 抗拉强度/MPa |
|---|
| 2 650 | 68 | 0.228 | 75 | 40 | 2.5 | 4 | 0.8 | 150 | 11.2 |
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| 密度/(kg·m-3) | 杨氏模量/GPa | 泊松比 | 屈服压力/MPa | 切线模量/MPa | 应变率参数C | 应变率参数P | 失效应变fs |
|---|
| 1 900 | 3.3 | 0.33 | 0.65 | 0.45 | 2.5 | 4 | 0.5 |
), ArticleFig(id=1240651356244071126, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631730214851383, language=CN, label=表4, caption=
炮泥材料模型参数
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| 密度/(kg·m-3) | 杨氏模量/GPa | 泊松比 | 屈服压力/MPa | 切线模量/MPa | 应变率参数C | 应变率参数P | 失效应变fs |
|---|
| 1 900 | 3.3 | 0.33 | 0.65 | 0.45 | 2.5 | 4 | 0.5 |
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| 填塞长度/m | 岩石爆破碎块面积/m2 |
|---|
| 平均值 | 最小值 | 最大值 | 中值 | 方差 |
|---|
| 1 | 0.102 300 | 0.001 4 | 21.889 0 | 0.003 7 | 0.972 9 |
| 2 | 0.098 490 | 0.000 7 | 23.103 3 | 0.003 9 | 1.277 5 |
| 3 | 0.099 765 | 0.000 7 | 33.814 7 | 0.003 6 | 1.487 8 |
| 4 | 0.104 166 | 0.000 7 | 22.395 7 | 0.003 4 | 1.099 5 |
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不同填塞长度下岩石爆破碎块面积统计分析结果
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| 填塞长度/m | 岩石爆破碎块面积/m2 |
|---|
| 平均值 | 最小值 | 最大值 | 中值 | 方差 |
|---|
| 1 | 0.102 300 | 0.001 4 | 21.889 0 | 0.003 7 | 0.972 9 |
| 2 | 0.098 490 | 0.000 7 | 23.103 3 | 0.003 9 | 1.277 5 |
| 3 | 0.099 765 | 0.000 7 | 33.814 7 | 0.003 6 | 1.487 8 |
| 4 | 0.104 166 | 0.000 7 | 22.395 7 | 0.003 4 | 1.099 5 |
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