Experimental Investigation on the Effects of Cutting Direction and Joint Spacing on the Cuttability Behaviour of a Conical Pick in Jointed Rock Mass
In this study, a series of rock cutting tests was conducted using a conical pick to investigate the effect of joints on roadheader performance. Tests were performed on intact rock and jointed rock mass specimens with three different joint spacings. The results indicate that cuttability is enhanced i...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-04-01
|
| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/15/8/4347 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850144540325838848 |
|---|---|
| author | Han-Eol Kim Min-Seong Kim Wan-Kyu Yoo Chang-Yong Kim |
| author_facet | Han-Eol Kim Min-Seong Kim Wan-Kyu Yoo Chang-Yong Kim |
| author_sort | Han-Eol Kim |
| collection | DOAJ |
| description | In this study, a series of rock cutting tests was conducted using a conical pick to investigate the effect of joints on roadheader performance. Tests were performed on intact rock and jointed rock mass specimens with three different joint spacings. The results indicate that cuttability is enhanced in jointed rock mass compared to intact rock due to the influence of joints on fracture mechanics. When cutting perpendicular to the joint plane, joints shorten the fracture path for rock chip formation, reducing the cutting force (<i>FC</i>). In parallel cutting, the joint plane acts as a barrier to side-crack propagation, leading to a further reduction in <i>FC</i>. The <i>FC</i> and specific energy (<i>SE</i>) were generally lower in parallel cutting than in perpendicular cutting. However, when the cutting depth exceeded 0.2 times the joint spacing and the line spacing surpassed 0.4 times the joint spacing, this trend reversed. This occurred because joints hindered the interaction between adjacent cuts, causing a transition to an unrelieved cutting mode. Additionally, <i>FC</i> and <i>SE</i> increased with joint spacing. When joint spacing reached ten times the cutting depth, their values approached those of intact rock. This suggests that the joint effect becomes negligible. These findings provide a better understanding of the effect of joints on roadheader performance. |
| format | Article |
| id | doaj-art-cf7ae41cc39e4f3fa6a27f2a1b972ad2 |
| institution | OA Journals |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj-art-cf7ae41cc39e4f3fa6a27f2a1b972ad22025-08-20T02:28:19ZengMDPI AGApplied Sciences2076-34172025-04-01158434710.3390/app15084347Experimental Investigation on the Effects of Cutting Direction and Joint Spacing on the Cuttability Behaviour of a Conical Pick in Jointed Rock MassHan-Eol Kim0Min-Seong Kim1Wan-Kyu Yoo2Chang-Yong Kim3Department 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 KoreaIn this study, a series of rock cutting tests was conducted using a conical pick to investigate the effect of joints on roadheader performance. Tests were performed on intact rock and jointed rock mass specimens with three different joint spacings. The results indicate that cuttability is enhanced in jointed rock mass compared to intact rock due to the influence of joints on fracture mechanics. When cutting perpendicular to the joint plane, joints shorten the fracture path for rock chip formation, reducing the cutting force (<i>FC</i>). In parallel cutting, the joint plane acts as a barrier to side-crack propagation, leading to a further reduction in <i>FC</i>. The <i>FC</i> and specific energy (<i>SE</i>) were generally lower in parallel cutting than in perpendicular cutting. However, when the cutting depth exceeded 0.2 times the joint spacing and the line spacing surpassed 0.4 times the joint spacing, this trend reversed. This occurred because joints hindered the interaction between adjacent cuts, causing a transition to an unrelieved cutting mode. Additionally, <i>FC</i> and <i>SE</i> increased with joint spacing. When joint spacing reached ten times the cutting depth, their values approached those of intact rock. This suggests that the joint effect becomes negligible. These findings provide a better understanding of the effect of joints on roadheader performance.https://www.mdpi.com/2076-3417/15/8/4347cutting forcecutting efficiencyrock cutting testjoint rock massconical pick |
| spellingShingle | Han-Eol Kim Min-Seong Kim Wan-Kyu Yoo Chang-Yong Kim Experimental Investigation on the Effects of Cutting Direction and Joint Spacing on the Cuttability Behaviour of a Conical Pick in Jointed Rock Mass Applied Sciences cutting force cutting efficiency rock cutting test joint rock mass conical pick |
| title | Experimental Investigation on the Effects of Cutting Direction and Joint Spacing on the Cuttability Behaviour of a Conical Pick in Jointed Rock Mass |
| title_full | Experimental Investigation on the Effects of Cutting Direction and Joint Spacing on the Cuttability Behaviour of a Conical Pick in Jointed Rock Mass |
| title_fullStr | Experimental Investigation on the Effects of Cutting Direction and Joint Spacing on the Cuttability Behaviour of a Conical Pick in Jointed Rock Mass |
| title_full_unstemmed | Experimental Investigation on the Effects of Cutting Direction and Joint Spacing on the Cuttability Behaviour of a Conical Pick in Jointed Rock Mass |
| title_short | Experimental Investigation on the Effects of Cutting Direction and Joint Spacing on the Cuttability Behaviour of a Conical Pick in Jointed Rock Mass |
| title_sort | experimental investigation on the effects of cutting direction and joint spacing on the cuttability behaviour of a conical pick in jointed rock mass |
| topic | cutting force cutting efficiency rock cutting test joint rock mass conical pick |
| url | https://www.mdpi.com/2076-3417/15/8/4347 |
| work_keys_str_mv | AT haneolkim experimentalinvestigationontheeffectsofcuttingdirectionandjointspacingonthecuttabilitybehaviourofaconicalpickinjointedrockmass AT minseongkim experimentalinvestigationontheeffectsofcuttingdirectionandjointspacingonthecuttabilitybehaviourofaconicalpickinjointedrockmass AT wankyuyoo experimentalinvestigationontheeffectsofcuttingdirectionandjointspacingonthecuttabilitybehaviourofaconicalpickinjointedrockmass AT changyongkim experimentalinvestigationontheeffectsofcuttingdirectionandjointspacingonthecuttabilitybehaviourofaconicalpickinjointedrockmass |