Theoretical and Numerical Research on V-Cut Parameters and Auxiliary Cuthole Criterion in Tunnelling
This paper aims at providing a sound theoretical solution to auxiliary central hole and the cutting parameters. For this purpose, the forming mechanism of V-cut cavity for cutting blasting was performed based on the hypothetical rock breaking mechanism of V-cut blasting. A theoretical solution for i...
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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: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/8568153 |
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| author | Xiaoming Lou Bao Wang En Wu Mingwu Sun Ping Zhou Zhenchang Wang |
| author_facet | Xiaoming Lou Bao Wang En Wu Mingwu Sun Ping Zhou Zhenchang Wang |
| author_sort | Xiaoming Lou |
| collection | DOAJ |
| description | This paper aims at providing a sound theoretical solution to auxiliary central hole and the cutting parameters. For this purpose, the forming mechanism of V-cut cavity for cutting blasting was performed based on the hypothetical rock breaking mechanism of V-cut blasting. A theoretical solution for increasing the critical depth of the auxiliary center cuthole and the criteria for increasing the cuthole diameter of various types of cutholes when the rock attributes, explosive properties, and cuthole dip angle are constant are proposed. (1) If charging length le < 0.75H/sin θ, no auxiliary cuthole is needed. (2) If 0.75H/sin θ < le < 0.75H/sin θ + (2∼4) × 0.1, a central vertical auxiliary hole is needed. (3) If 0.75H/sin θ + (2∼4) × 0.1 < le < 0.75(H/sin θ + Hi/sin θi), a shallow inclined hole is needed. (4) If le > 0.75(H/sin θ + Hi/sin θi), both the central vertical cuthole and the shallow inclined cuthole are needed. Meanwhile, the theoretical solution was verified by numerical modelling with ANSYS/LS-DYNA. Moreover, the field implementation of the V-cut and the auxiliary hole effectively improved the blasting effect in both efficiency and economy. |
| format | Article |
| id | doaj-art-4c2d85b829ff48408346d1499a8681e4 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-4c2d85b829ff48408346d1499a8681e42025-02-03T01:25:49ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422020-01-01202010.1155/2020/85681538568153Theoretical and Numerical Research on V-Cut Parameters and Auxiliary Cuthole Criterion in TunnellingXiaoming Lou0Bao Wang1En Wu2Mingwu Sun3Ping Zhou4Zhenchang Wang5College of Zijin Mining, Fuzhou University, Fuzhou 350116, ChinaCollege of Zijin Mining, Fuzhou University, Fuzhou 350116, ChinaCollege of Zijin Mining, Fuzhou University, Fuzhou 350116, ChinaCollege of Zijin Mining, Fuzhou University, Fuzhou 350116, ChinaCollege of Zijin Mining, Fuzhou University, Fuzhou 350116, ChinaCollege of Zijin Mining, Fuzhou University, Fuzhou 350116, ChinaThis paper aims at providing a sound theoretical solution to auxiliary central hole and the cutting parameters. For this purpose, the forming mechanism of V-cut cavity for cutting blasting was performed based on the hypothetical rock breaking mechanism of V-cut blasting. A theoretical solution for increasing the critical depth of the auxiliary center cuthole and the criteria for increasing the cuthole diameter of various types of cutholes when the rock attributes, explosive properties, and cuthole dip angle are constant are proposed. (1) If charging length le < 0.75H/sin θ, no auxiliary cuthole is needed. (2) If 0.75H/sin θ < le < 0.75H/sin θ + (2∼4) × 0.1, a central vertical auxiliary hole is needed. (3) If 0.75H/sin θ + (2∼4) × 0.1 < le < 0.75(H/sin θ + Hi/sin θi), a shallow inclined hole is needed. (4) If le > 0.75(H/sin θ + Hi/sin θi), both the central vertical cuthole and the shallow inclined cuthole are needed. Meanwhile, the theoretical solution was verified by numerical modelling with ANSYS/LS-DYNA. Moreover, the field implementation of the V-cut and the auxiliary hole effectively improved the blasting effect in both efficiency and economy.http://dx.doi.org/10.1155/2020/8568153 |
| spellingShingle | Xiaoming Lou Bao Wang En Wu Mingwu Sun Ping Zhou Zhenchang Wang Theoretical and Numerical Research on V-Cut Parameters and Auxiliary Cuthole Criterion in Tunnelling Advances in Materials Science and Engineering |
| title | Theoretical and Numerical Research on V-Cut Parameters and Auxiliary Cuthole Criterion in Tunnelling |
| title_full | Theoretical and Numerical Research on V-Cut Parameters and Auxiliary Cuthole Criterion in Tunnelling |
| title_fullStr | Theoretical and Numerical Research on V-Cut Parameters and Auxiliary Cuthole Criterion in Tunnelling |
| title_full_unstemmed | Theoretical and Numerical Research on V-Cut Parameters and Auxiliary Cuthole Criterion in Tunnelling |
| title_short | Theoretical and Numerical Research on V-Cut Parameters and Auxiliary Cuthole Criterion in Tunnelling |
| title_sort | theoretical and numerical research on v cut parameters and auxiliary cuthole criterion in tunnelling |
| url | http://dx.doi.org/10.1155/2020/8568153 |
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