Effect of Pre-Existing Symmetrical Cracks on Propagation Behaviors of a Blast-Induced Crack
Defects such as voids, pores, and joints will transform into big scale cracks in the rock of tunnel surrounding under dynamic load like blasting and earthquake. In this paper, three kinds of symmetrical cracks were chosen as an example, and experiments and numerical simulations were conducted to stu...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2020/5892324 |
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| _version_ | 1832566329682427904 |
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| author | Duanying Wan Zheming Zhu Changlin Zhou Jianfei Li Peng Ying Meng Wang |
| author_facet | Duanying Wan Zheming Zhu Changlin Zhou Jianfei Li Peng Ying Meng Wang |
| author_sort | Duanying Wan |
| collection | DOAJ |
| description | Defects such as voids, pores, and joints will transform into big scale cracks in the rock of tunnel surrounding under dynamic load like blasting and earthquake. In this paper, three kinds of symmetrical cracks were chosen as an example, and experiments and numerical simulations were conducted to study the effect of symmetric cracks on a blast-induced crack. The relationship of main crack propagation characteristic and distribution of symmetrical cracks was investigated. Some circular specimens using two kinds of material, PMMA and sandstone, including a center hole charged with a detonator and pre-existing cracks were used in the experiments. The test system consisted of an oscilloscope and an ultradynamic strain amplifier and crack propagation gauges (CPGs) were employed in monitoring propagation velocity. AUTODYN code was applied in numerical simulation to investigate the propagation behavior of main crack between symmetrical cracks. Linear equation of state and a modified major principal stress failure criterion was utilized to describe the status of rock material. Based on experimental and numerical results, it can be concluded that (1) the pre-existing symmetrical cracks have arrest effect on main crack propagation, (2) compressive stress in y-direction plays very important roles in crack arrest, and (3) the spacing of parallel cracks has a great influence on crack propagation length and velocity. |
| format | Article |
| id | doaj-art-30606727cce14ae9b8c87fc830662a61 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-30606727cce14ae9b8c87fc830662a612025-02-03T01:04:22ZengWileyShock and Vibration1070-96221875-92032020-01-01202010.1155/2020/58923245892324Effect of Pre-Existing Symmetrical Cracks on Propagation Behaviors of a Blast-Induced CrackDuanying Wan0Zheming Zhu1Changlin Zhou2Jianfei Li3Peng Ying4Meng Wang5State Key Laboratory of Hydraulics and Mountain River Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, ChinaMOE Key Laboratory of Deep Underground Science and Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, ChinaChengdu Surveying Geotechnical Research Institute Co., Ltd. of MCC, Chengdu 610023, ChinaMOE Key Laboratory of Deep Underground Science and Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, ChinaDefects such as voids, pores, and joints will transform into big scale cracks in the rock of tunnel surrounding under dynamic load like blasting and earthquake. In this paper, three kinds of symmetrical cracks were chosen as an example, and experiments and numerical simulations were conducted to study the effect of symmetric cracks on a blast-induced crack. The relationship of main crack propagation characteristic and distribution of symmetrical cracks was investigated. Some circular specimens using two kinds of material, PMMA and sandstone, including a center hole charged with a detonator and pre-existing cracks were used in the experiments. The test system consisted of an oscilloscope and an ultradynamic strain amplifier and crack propagation gauges (CPGs) were employed in monitoring propagation velocity. AUTODYN code was applied in numerical simulation to investigate the propagation behavior of main crack between symmetrical cracks. Linear equation of state and a modified major principal stress failure criterion was utilized to describe the status of rock material. Based on experimental and numerical results, it can be concluded that (1) the pre-existing symmetrical cracks have arrest effect on main crack propagation, (2) compressive stress in y-direction plays very important roles in crack arrest, and (3) the spacing of parallel cracks has a great influence on crack propagation length and velocity.http://dx.doi.org/10.1155/2020/5892324 |
| spellingShingle | Duanying Wan Zheming Zhu Changlin Zhou Jianfei Li Peng Ying Meng Wang Effect of Pre-Existing Symmetrical Cracks on Propagation Behaviors of a Blast-Induced Crack Shock and Vibration |
| title | Effect of Pre-Existing Symmetrical Cracks on Propagation Behaviors of a Blast-Induced Crack |
| title_full | Effect of Pre-Existing Symmetrical Cracks on Propagation Behaviors of a Blast-Induced Crack |
| title_fullStr | Effect of Pre-Existing Symmetrical Cracks on Propagation Behaviors of a Blast-Induced Crack |
| title_full_unstemmed | Effect of Pre-Existing Symmetrical Cracks on Propagation Behaviors of a Blast-Induced Crack |
| title_short | Effect of Pre-Existing Symmetrical Cracks on Propagation Behaviors of a Blast-Induced Crack |
| title_sort | effect of pre existing symmetrical cracks on propagation behaviors of a blast induced crack |
| url | http://dx.doi.org/10.1155/2020/5892324 |
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