Theoretical and Experimental Study of the Effects of Impact Drilling Parameters on the Properties of Surrounding Rock Damage
Using a self-designed hydraulic impact drilling test-bed and rock core drill, six groups of cylindrical granite specimens (93 mm dia. × 200 mm) containing central axial holes formed either by impact or nonimpact drilling methods were tested in uniaxial compression to failure on an Instron 1346 unive...
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Hindawi Limited
2020-01-01
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Series: | Shock and Vibration |
Online Access: | http://dx.doi.org/10.1155/2020/8865619 |
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doaj-8d85ee7f6327414ea953ebb37ddbb2422020-11-25T03:24:09ZengHindawi LimitedShock and Vibration1070-96221875-92032020-01-01202010.1155/2020/88656198865619Theoretical and Experimental Study of the Effects of Impact Drilling Parameters on the Properties of Surrounding Rock DamageZhi Liu0Wanrong Wu1Qianhua Hao2Peng Sun3Yuangen Ding4College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan, ChinaCollege of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan, ChinaCollege of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan, ChinaCollege of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan, ChinaCollege of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan, ChinaUsing a self-designed hydraulic impact drilling test-bed and rock core drill, six groups of cylindrical granite specimens (93 mm dia. × 200 mm) containing central axial holes formed either by impact or nonimpact drilling methods were tested in uniaxial compression to failure on an Instron 1346 universal testing machine to investigate their mechanics and damage properties. The longitudinal acoustic wave velocities were measured before testing. The rock specimens were grouped according to the method of drilling the central hole (impact load exerted by different impact power and different frequencies for an approximately identical impact power, or nonimpact drilling). In this study, a statistical constitutive damage model based on Weibull distribution was used to calculate the degree of rock damage after drilling center holes. The experimental curves were measured to analyze the damage evolution process and the radius of rock damage. These indicate that rock damage increased with the increase of impact power and decreased with increasing impact frequency at constant impact power. This was also verified by the measured longitudinal wave velocity in all rock specimens. These results have significance for guiding the design of composite rock drilling tools that are dedicated to improving rock-breaking efficiency.http://dx.doi.org/10.1155/2020/8865619 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Zhi Liu Wanrong Wu Qianhua Hao Peng Sun Yuangen Ding |
spellingShingle |
Zhi Liu Wanrong Wu Qianhua Hao Peng Sun Yuangen Ding Theoretical and Experimental Study of the Effects of Impact Drilling Parameters on the Properties of Surrounding Rock Damage Shock and Vibration |
author_facet |
Zhi Liu Wanrong Wu Qianhua Hao Peng Sun Yuangen Ding |
author_sort |
Zhi Liu |
title |
Theoretical and Experimental Study of the Effects of Impact Drilling Parameters on the Properties of Surrounding Rock Damage |
title_short |
Theoretical and Experimental Study of the Effects of Impact Drilling Parameters on the Properties of Surrounding Rock Damage |
title_full |
Theoretical and Experimental Study of the Effects of Impact Drilling Parameters on the Properties of Surrounding Rock Damage |
title_fullStr |
Theoretical and Experimental Study of the Effects of Impact Drilling Parameters on the Properties of Surrounding Rock Damage |
title_full_unstemmed |
Theoretical and Experimental Study of the Effects of Impact Drilling Parameters on the Properties of Surrounding Rock Damage |
title_sort |
theoretical and experimental study of the effects of impact drilling parameters on the properties of surrounding rock damage |
publisher |
Hindawi Limited |
series |
Shock and Vibration |
issn |
1070-9622 1875-9203 |
publishDate |
2020-01-01 |
description |
Using a self-designed hydraulic impact drilling test-bed and rock core drill, six groups of cylindrical granite specimens (93 mm dia. × 200 mm) containing central axial holes formed either by impact or nonimpact drilling methods were tested in uniaxial compression to failure on an Instron 1346 universal testing machine to investigate their mechanics and damage properties. The longitudinal acoustic wave velocities were measured before testing. The rock specimens were grouped according to the method of drilling the central hole (impact load exerted by different impact power and different frequencies for an approximately identical impact power, or nonimpact drilling). In this study, a statistical constitutive damage model based on Weibull distribution was used to calculate the degree of rock damage after drilling center holes. The experimental curves were measured to analyze the damage evolution process and the radius of rock damage. These indicate that rock damage increased with the increase of impact power and decreased with increasing impact frequency at constant impact power. This was also verified by the measured longitudinal wave velocity in all rock specimens. These results have significance for guiding the design of composite rock drilling tools that are dedicated to improving rock-breaking efficiency. |
url |
http://dx.doi.org/10.1155/2020/8865619 |
work_keys_str_mv |
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