Experimental Investigation on Joint Effects in Rock Cutting with a Conical Pick Under Unrelieved Cutting Conditions
In this study, a series of unrelieved cutting tests was conducted to analyze the effect of joints on rock cutting using a conical pick. The tests were performed on jointed rock mass specimens with joint spacings (<i>J<sub>s</sub></i>) of 30, 60, and 90 mm and at cutting depth...
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MDPI AG
2025-05-01
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| author | Han-Eol Kim Min-Seong Kim Wan-Kyu Yoo Chang-Yong Kim Ji-Seok Yun |
| author_facet | Han-Eol Kim Min-Seong Kim Wan-Kyu Yoo Chang-Yong Kim Ji-Seok Yun |
| author_sort | Han-Eol Kim |
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| description | In this study, a series of unrelieved cutting tests was conducted to analyze the effect of joints on rock cutting using a conical pick. The tests were performed on jointed rock mass specimens with joint spacings (<i>J<sub>s</sub></i>) of 30, 60, and 90 mm and at cutting depths of 3, 6, 9, and 12 mm. For each case, the distance between the cutting path and the joint plane (<i>d</i>) was varied from 0.1<i>J<sub>s</sub></i> to 0.5<i>J<sub>s</sub></i>. The cutting force decreased as the distance from the joint plane increased but reached the level observed in intact rock at the midpoint between adjacent joint planes (<i>d</i> = 0.5<i>J<sub>s</sub></i>). Regardless of joint spacing, the cutting force reached its minimum when <i>d</i> was between 0.2<i>J<sub>s</sub></i> and 0.3<i>J<sub>s</sub></i>. The rock fragmentation zone extended beyond the joint plane when d was 0.1<i>J<sub>s</sub></i> but became confined within the joint plane from around 0.2<i>J<sub>s</sub></i> to 0.3<i>J<sub>s</sub></i>. These results indicate that the influence of the joint is most pronounced within this range. Three types of crack propagation patterns were observed near the joint plane: (1) cracks that terminate at the joint along the shortest path, (2) cracks that pass through the joint and reach the opposite free surface, and (3) cracks that end at a free surface located just inside the joint plane. These observations suggest that the reduction in cutting force can be attributed to shorter crack propagation paths due to the presence of the joint. This study contributes to a better understanding of the cutting behavior of jointed rock masses when using a conical pick. |
| format | Article |
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| institution | Kabale University |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj-art-29c8dd65d88a41cf8b5917d0d1c99f0c2025-08-20T03:47:53ZengMDPI AGApplied Sciences2076-34172025-05-011510557810.3390/app15105578Experimental Investigation on Joint Effects in Rock Cutting with a Conical Pick Under Unrelieved Cutting ConditionsHan-Eol Kim0Min-Seong Kim1Wan-Kyu Yoo2Chang-Yong Kim3Ji-Seok Yun4Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-ro, Ilsanseo-gu, Goyang-si 10223, Republic of KoreaDepartment of Energy and Resources Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of KoreaDepartment of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-ro, Ilsanseo-gu, Goyang-si 10223, Republic of KoreaDepartment of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-ro, Ilsanseo-gu, Goyang-si 10223, Republic of KoreaDepartment of Smartcity Engineering, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan-si 15588, Republic of KoreaIn this study, a series of unrelieved cutting tests was conducted to analyze the effect of joints on rock cutting using a conical pick. The tests were performed on jointed rock mass specimens with joint spacings (<i>J<sub>s</sub></i>) of 30, 60, and 90 mm and at cutting depths of 3, 6, 9, and 12 mm. For each case, the distance between the cutting path and the joint plane (<i>d</i>) was varied from 0.1<i>J<sub>s</sub></i> to 0.5<i>J<sub>s</sub></i>. The cutting force decreased as the distance from the joint plane increased but reached the level observed in intact rock at the midpoint between adjacent joint planes (<i>d</i> = 0.5<i>J<sub>s</sub></i>). Regardless of joint spacing, the cutting force reached its minimum when <i>d</i> was between 0.2<i>J<sub>s</sub></i> and 0.3<i>J<sub>s</sub></i>. The rock fragmentation zone extended beyond the joint plane when d was 0.1<i>J<sub>s</sub></i> but became confined within the joint plane from around 0.2<i>J<sub>s</sub></i> to 0.3<i>J<sub>s</sub></i>. These results indicate that the influence of the joint is most pronounced within this range. Three types of crack propagation patterns were observed near the joint plane: (1) cracks that terminate at the joint along the shortest path, (2) cracks that pass through the joint and reach the opposite free surface, and (3) cracks that end at a free surface located just inside the joint plane. These observations suggest that the reduction in cutting force can be attributed to shorter crack propagation paths due to the presence of the joint. This study contributes to a better understanding of the cutting behavior of jointed rock masses when using a conical pick.https://www.mdpi.com/2076-3417/15/10/5578conical pickcutting forcejointrock cutting testmechanical excavation |
| spellingShingle | Han-Eol Kim Min-Seong Kim Wan-Kyu Yoo Chang-Yong Kim Ji-Seok Yun Experimental Investigation on Joint Effects in Rock Cutting with a Conical Pick Under Unrelieved Cutting Conditions Applied Sciences conical pick cutting force joint rock cutting test mechanical excavation |
| title | Experimental Investigation on Joint Effects in Rock Cutting with a Conical Pick Under Unrelieved Cutting Conditions |
| title_full | Experimental Investigation on Joint Effects in Rock Cutting with a Conical Pick Under Unrelieved Cutting Conditions |
| title_fullStr | Experimental Investigation on Joint Effects in Rock Cutting with a Conical Pick Under Unrelieved Cutting Conditions |
| title_full_unstemmed | Experimental Investigation on Joint Effects in Rock Cutting with a Conical Pick Under Unrelieved Cutting Conditions |
| title_short | Experimental Investigation on Joint Effects in Rock Cutting with a Conical Pick Under Unrelieved Cutting Conditions |
| title_sort | experimental investigation on joint effects in rock cutting with a conical pick under unrelieved cutting conditions |
| topic | conical pick cutting force joint rock cutting test mechanical excavation |
| url | https://www.mdpi.com/2076-3417/15/10/5578 |
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