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Differences in thickness, mineral composition, wave impedance, and joint fissures. This often leads to a mismatch between the charge structure of the pre-splitting and cutting holes and the physical and mechanical properties of the layers, which can easily cause the complex rock layers to fail to pre-split. The soft rock layers form chicken-nest-shaped explosive pits due to excessive consumption of explosive energy, making it difficult for pre-splitting and cutting holes to penetrate the entire length of the blast hole effectively. To attain consistent pre-splitting of the composite roof, the LS-DYNA software was employed to analyze the impact of the charging structure on the pre-splitting effect of the composite roof. Based on this foundation, a uniform-dispersion and pressure-holding pre-splitting blasting technique was proposed for the composite roof. Field experiments were conducted, and in conjunction with the preliminary evaluation of the progression of post-blast fractures, the viability of this uniform-dispersion and pressure-holding pre-splitting blasting method was substantiated. The research results indicate that the escape of explosive gas from hard rock layers to soft rock layers is the primary reason for the uneven energy utilization in the pre-cracking explosion of the composite roof. The composite roof uniform dispersion pressure pre-splitting blasting technology divides the pre-splitting holes into multiple chambers according to the layered structure of the composite roof. Each layer has an independent post-explosion pressure holding chamber, which meets the explosive energy requirements of each pre-splitting layer, thereby avoiding excessive consumption of explosive energy in soft rock layers and enhancing the pre-splitting effect in hard rock layers.
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ZHANG Tao (1994-), male, born in Datong, Shanxi Province, postgraduate, mainly engaged in research on the theory and technology of mining engineering and engineering blasting, (E-mail)
962941834@qq.com.
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复合顶板具有多层不同岩性的分层,各分层厚度、矿物成分、波阻抗以及节理裂隙等存在显著差异,这常常导致预裂切缝孔装药结构与分层的物理力学性质不匹配,易造成硬岩分层无法预裂,软岩分层因过度消耗爆炸能量形成鸡窝状爆坑,预裂切缝难以沿炮孔全长有效贯通。为实现复合顶板均匀预裂,采用LS-DYNA软件分析了装药结构对复合顶板预裂效果的影响,在此基础上提出了复合顶板均散保压预裂爆破技术;通过开展现场试验,结合爆后对爆生裂隙发育情况的窥视评价,验证了该均散保压预裂爆破技术的可行性。研究结果表明:爆生气体由硬岩分层向软岩分层逃逸是造成复合顶板预裂爆炸能量利用不均的主要原因;复合顶板均散保压预裂爆破技术按照复合顶板分层结构将预裂孔分割成多个腔体,各分层具有独立的爆后保压腔体,满足了预裂各分层的爆炸能量需求,避免了炸药能量过度消耗在软岩分层,提高了硬岩分层预裂效果。
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张志忠(1975-),男,山西五台人,高级工程师、本科,主要从事煤矿安全高效绿色开采理论及技术研究工作,(E-mail)1373711284@qq.com。
ZHANG Zhi-zhong (1975-), male, born in Wutai, Shanxi Province, undergraduate, mainly engaged in research on the theory and technology of safe, efficient and green mining in coal mines, (E-mail) 1373711284@qq.com.
, authorsList=张志忠, 刘玉山, 张雪峰, 郝兵元, 王晨龙, 张涛)}, authors=[Author(id=1240702077974925994, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=1373711284@qq.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1240702078067200686, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, authorId=1240702077974925994, language=EN, stringName=Zhi-zhong ZHANG, firstName=Zhi-zhong, middleName=null, lastName=ZHANG, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1.No.2 Mine of Shanxi Huayang Group New Energy Co., Ltd., Yangquan 045000, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1240702078134309555, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, authorId=1240702077974925994, language=CN, stringName=张志忠, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1.山西华阳集团新能股份有限公司二矿,阳泉 045000, bio={"content":"
张志忠(1975-),男,山西五台人,高级工程师、本科,主要从事煤矿安全高效绿色开采理论及技术研究工作,(E-mail)1373711284@qq.com。
ZHANG Zhi-zhong (1975-), male, born in Wutai, Shanxi Province, undergraduate, mainly engaged in research on the theory and technology of safe, efficient and green mining in coal mines, (E-mail) 1373711284@qq.com.
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张志忠(1975-),男,山西五台人,高级工程师、本科,主要从事煤矿安全高效绿色开采理论及技术研究工作,(E-mail)1373711284@qq.com。
ZHANG Zhi-zhong (1975-), male, born in Wutai, Shanxi Province, undergraduate, mainly engaged in research on the theory and technology of safe, efficient and green mining in coal mines, (E-mail) 1373711284@qq.com.
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1.No.2 Mine of Shanxi Huayang Group New Energy Co., Ltd., Yangquan 045000, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1240702078687957729, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, authorId=1240702078507602644, language=CN, stringName=张雪峰, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1.山西华阳集团新能股份有限公司二矿,阳泉 045000, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1240702077693907595, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, xref=1., ext=[AuthorCompanyExt(id=1240702077698101900, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, companyId=1240702077693907595, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1.No.2 Mine of Shanxi Huayang Group New Energy Co., Ltd., Yangquan 045000, China), AuthorCompanyExt(id=1240702077706490509, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, companyId=1240702077693907595, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1.山西华阳集团新能股份有限公司二矿,阳泉 045000)])]), Author(id=1240702078763455211, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, orderNo=3, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=null, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1240702078838952689, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, authorId=1240702078763455211, language=EN, stringName=Bing-yuan HAO, firstName=Bing-yuan, middleName=null, lastName=HAO, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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2.Taiyuan University of Technology, Taiyuan 030024, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1240702078960587512, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, authorId=1240702078763455211, language=CN, stringName=郝兵元, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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2.太原理工大学,太原 030024, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1240702077773599381, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, xref=2., ext=[AuthorCompanyExt(id=1240702077781987991, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, companyId=1240702077773599381, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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2.太原理工大学,太原 030024)])]), Author(id=1240702079040279298, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, orderNo=4, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=null, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1240702080567005968, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, authorId=1240702079040279298, language=EN, stringName=Chen-long WANG, firstName=Chen-long, middleName=null, lastName=WANG, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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2.Taiyuan University of Technology, Taiyuan 030024, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1240702080676057882, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, authorId=1240702079040279298, language=CN, stringName=王晨龙, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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3.Shanxi Jichangtai Mine Engineering Technology Co., Ltd., Taiyuan 030024, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1240702080986436403, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, authorId=1240702080768332577, language=CN, stringName=张涛, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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157: 103983., articleTitle=Numerical investigation on crack propagation and coalescence induced by dual-borehole blasting, refAbstract=null), Reference(id=1240702089882554595, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, doi=null, pmid=null, pmcid=null, year=2007, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[16], rfOrder=28, authorNames=赵凯, journalName=null, refType=null, unstructuredReference=赵凯. 分层防护层对爆炸波的衰减和弥散作用研究[D]. 合肥: 中国科学技术大学,
2007., articleTitle=分层防护层对爆炸波的衰减和弥散作用研究, refAbstract=null), Reference(id=1240702089966440680, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, doi=null, pmid=null, pmcid=null, year=2007, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[16], rfOrder=29, authorNames=ZHAO Kai, journalName=null, refType=null, unstructuredReference=
ZHAO Kai. The attenuation and dispersion effects on explosive wave of layered protective engineering[D]. Hefei: University of Science and Technology of China,
2007. (in Chinese), articleTitle=The attenuation and dispersion effects on explosive wave of layered protective engineering, refAbstract=null)], funds=[Fund(id=1240702085444980795, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, awardId=12102294, language=EN, fundingSource=The Youth Project of the National Natural Science Foundation of China(12102294), fundOrder=null, country=null), Fund(id=1240702085537255488, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, awardId=12102294, language=CN, fundingSource=国家自然科学基金青年项目(12102294), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1240702077693907595, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, xref=1., ext=[AuthorCompanyExt(id=1240702077698101900, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, companyId=1240702077693907595, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1.No.2 Mine of Shanxi Huayang Group New Energy Co., Ltd., Yangquan 045000, China), AuthorCompanyExt(id=1240702077706490509, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, companyId=1240702077693907595, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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Influence of explosive configuration on the pre-splitting blasting results of composite roof, figureFileSmall=pJK/6Bn/uqzgutiHBknzVA==, figureFileBig=WveBnnYbX5mPRMVRyNDDvQ==, tableContent=null), ArticleFig(id=1240702081833685886, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=CN, label=图1, caption=
装药结构对复合顶板切缝效果影响示意图, figureFileSmall=pJK/6Bn/uqzgutiHBknzVA==, figureFileBig=WveBnnYbX5mPRMVRyNDDvQ==, tableContent=null), ArticleFig(id=1240702082060178327, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=EN, label=Fig. 2, caption=
Numerical model of the dispersed charge pre-splitting blasting technology for uniform fracturing composite roof, figureFileSmall=qMzKMWvv8gq5BzTnAfo3ig==, figureFileBig=JknWisvhqACRW3IkumXfDA==, tableContent=null), ArticleFig(id=1240702082169230241, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=CN, label=图2, caption=
复合顶板均散保压预裂爆破模型, figureFileSmall=qMzKMWvv8gq5BzTnAfo3ig==, figureFileBig=JknWisvhqACRW3IkumXfDA==, tableContent=null), ArticleFig(id=1240702082253116328, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=EN, label=Fig. 3, caption=
Influence of explosive configuration on the pre-splitting blasting results of composite roof, figureFileSmall=n28lBNUdcSoIQQVqd1E28g==, figureFileBig=XmoxqVtbHNFXTFmg8Ki4FQ==, tableContent=null), ArticleFig(id=1240702082374751155, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=CN, label=图3, caption=
装药结构对复合顶板爆破效果影响, figureFileSmall=n28lBNUdcSoIQQVqd1E28g==, figureFileBig=XmoxqVtbHNFXTFmg8Ki4FQ==, tableContent=null), ArticleFig(id=1240702082458637243, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=EN, label=Fig. 4, caption=
Explosive gas pressure at monitoring points AP1~AP4, figureFileSmall=pJxlOSdkE7uB7RdX6MIB7A==, figureFileBig=xG3HfAfWjBu/2BOx3S24EQ==, tableContent=null), ArticleFig(id=1240702082563494853, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=CN, label=图4, caption=
监测点AP1~AP4爆生气体压力, figureFileSmall=pJxlOSdkE7uB7RdX6MIB7A==, figureFileBig=xG3HfAfWjBu/2BOx3S24EQ==, tableContent=null), ArticleFig(id=1240702082647380942, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=EN, label=Fig. 5, caption=
Charge structure of the uniform fracturing composite roof pre-splitting blasting in the gob-side entry retaining experimental section, figureFileSmall=gtkIMQB0AWP3xLoGeh3S6Q==, figureFileBig=EV+LuZtQZphJ1x8dUTbfng==, tableContent=null), ArticleFig(id=1240702082727072726, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=CN, label=图5, caption=
留巷试验段复合顶板均散保压预裂切缝装药结构, figureFileSmall=gtkIMQB0AWP3xLoGeh3S6Q==, figureFileBig=EV+LuZtQZphJ1x8dUTbfng==, tableContent=null), ArticleFig(id=1240702082823541726, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=EN, label=Fig. 6, caption=
Borehole arrangement in the uniform fracturing composite roof with dispersed charge pre-splitting blasting test, figureFileSmall=zERsxXhecXguwxzYGrt8kA==, figureFileBig=Trkcs4AcYrk6MVVSheSB+w==, tableContent=null), ArticleFig(id=1240702082932593639, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=CN, label=图6, caption=
复合顶板均散保压预裂切缝试爆炮孔布置, figureFileSmall=zERsxXhecXguwxzYGrt8kA==, figureFileBig=Trkcs4AcYrk6MVVSheSB+w==, tableContent=null), ArticleFig(id=1240702083012285424, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=EN, label=Fig. 7, caption=
Observation results of explosive cracks in the observation hole, figureFileSmall=NaYUliHSe8wj4Bb44c/ldg==, figureFileBig=lrIxiQ7fUCCEhIgaVdqldA==, tableContent=null), ArticleFig(id=1240702083100365814, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=CN, label=图7, caption=
观察孔爆生裂隙窥视结果, figureFileSmall=NaYUliHSe8wj4Bb44c/ldg==, figureFileBig=lrIxiQ7fUCCEhIgaVdqldA==, tableContent=null), ArticleFig(id=1240702083205223420, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=EN, label=Table 1, caption=
Emulsion explosive parameters and JWL state equation parameters[11,12]
, figureFileSmall=null, figureFileBig=null, tableContent=
| ρ/(g·cm-3) | D CJ/(cm·μs-1) | P CJ/(102 GPa) | A(102 GPa) | B/GPa | R1 | R2 | ω | E0/(102 GPa) |
|---|
| 1.1 | 0.45 | 9.7 | 2.14 | 0.182 | 4.2 | 0.9 | 0.15 | 0.04192 |
), ArticleFig(id=1240702083335245828, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=CN, label=表1, caption=
乳化炸药材料模型和JWL状态方程参数[11,12]
, figureFileSmall=null, figureFileBig=null, tableContent=
| ρ/(g·cm-3) | D CJ/(cm·μs-1) | P CJ/(102 GPa) | A(102 GPa) | B/GPa | R1 | R2 | ω | E0/(102 GPa) |
|---|
| 1.1 | 0.45 | 9.7 | 2.14 | 0.182 | 4.2 | 0.9 | 0.15 | 0.04192 |
), ArticleFig(id=1240702083465269265, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=EN, label=Table 2, caption=
JH2 parameters of rock[11,13-15]
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数Parameters | 硬岩及顶底岩层Hard rock,topmost and bottommost rock layers | 软岩Soft rock | 参数Parameters | 硬岩及顶底岩层Hard rock,topmost and bottommost rock layers | 软岩Soft rock |
|---|
| ρ/(g·cm-3) | 2.66 | 2.6 | HEL/GPa | 4.5 | 3.2 |
| G/GPa | 21.9 | 12.31 | P HEL/GPa | 3.7 | 2.32 |
| A | 0.76 | 0.76 | β | 0.5 | 1 |
| B | 0.25 | 0.25 | D1 | 0.005 | 0.005 |
| C | 0.005 | 0.005 | D2 | 0.7 | 0.7 |
| M | 0.62 | 0.62 | K1/GPa | 25.7 | 26.67 |
| N | 0.62 | 0.62 | K2/GPa | -4500 | -37.59 |
| T/MPa | 54.0 | 40.0 | K3/GPa | 300000 | 5213.7 |
| | | | σ F max | 0.25 | 0.25 |
), ArticleFig(id=1240702083557543961, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=CN, label=表2, caption=
岩石JH2模型参数[11,13-15]
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数Parameters | 硬岩及顶底岩层Hard rock,topmost and bottommost rock layers | 软岩Soft rock | 参数Parameters | 硬岩及顶底岩层Hard rock,topmost and bottommost rock layers | 软岩Soft rock |
|---|
| ρ/(g·cm-3) | 2.66 | 2.6 | HEL/GPa | 4.5 | 3.2 |
| G/GPa | 21.9 | 12.31 | P HEL/GPa | 3.7 | 2.32 |
| A | 0.76 | 0.76 | β | 0.5 | 1 |
| B | 0.25 | 0.25 | D1 | 0.005 | 0.005 |
| C | 0.005 | 0.005 | D2 | 0.7 | 0.7 |
| M | 0.62 | 0.62 | K1/GPa | 25.7 | 26.67 |
| N | 0.62 | 0.62 | K2/GPa | -4500 | -37.59 |
| T/MPa | 54.0 | 40.0 | K3/GPa | 300000 | 5213.7 |
| | | | σ F max | 0.25 | 0.25 |
), ArticleFig(id=1240702085075882012, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=EN, label=Table 3, caption=
DP parameters of stemming[16]
, figureFileSmall=null, figureFileBig=null, tableContent=
| ρ/(g·cm-3) | E/GPa | 内聚力Cohesion/MPa | 内摩擦角Internal friction angle/° | 泊松比Poisson′s ratio |
|---|
| 1.5 | 1.748 | 0.105 | 2.14 | 0.271 |
), ArticleFig(id=1240702085193322537, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=CN, label=表3, caption=
封堵炮泥DP模型参数[16]
, figureFileSmall=null, figureFileBig=null, tableContent=
| ρ/(g·cm-3) | E/GPa | 内聚力Cohesion/MPa | 内摩擦角Internal friction angle/° | 泊松比Poisson′s ratio |
|---|
| 1.5 | 1.748 | 0.105 | 2.14 | 0.271 |
), ArticleFig(id=1240702085260431407, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=EN, label=Table 4, caption=
MPLP parameters of PVC energy gathering tube[11]
, figureFileSmall=null, figureFileBig=null, tableContent=
| ρ/(kg·m-3) | E/MPa | PR | σ y/MPa | ETAN/MPa | FAIL | LCSS |
|---|
| 830.397 | 3057.78 | 0.45 | 6.895 | 344.75 | 0.25 | 3451 |
), ArticleFig(id=1240702085340123185, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702073960976925, language=CN, label=表4, caption=
聚能管聚氯乙烯MPLP模型参数[11]
, figureFileSmall=null, figureFileBig=null, tableContent=
| ρ/(kg·m-3) | E/MPa | PR | σ y/MPa | ETAN/MPa | FAIL | LCSS |
|---|
| 830.397 | 3057.78 | 0.45 | 6.895 | 344.75 | 0.25 | 3451 |
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