A Study on Cut Blasting with Large Diameter Charges in Hard Rock Roadways
To overcome the problems of poor cutting effects in hard rock roadways, a cut blasting technique with large diameter charges was developed; that is, the cut holes employ 50 mm diameter blast holes and 45 mm diameter explosive sticks, while the other holes adopt 42 mm diameter blast holes and 35 mm d...
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2020-01-01
|
| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/8873412 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850105037327433728 |
|---|---|
| author | Bing Cheng Haibo Wang Qi Zong Ying Xu MengXiang Wang Qiangqiang Zheng Chengjie Li |
| author_facet | Bing Cheng Haibo Wang Qi Zong Ying Xu MengXiang Wang Qiangqiang Zheng Chengjie Li |
| author_sort | Bing Cheng |
| collection | DOAJ |
| description | To overcome the problems of poor cutting effects in hard rock roadways, a cut blasting technique with large diameter charges was developed; that is, the cut holes employ 50 mm diameter blast holes and 45 mm diameter explosive sticks, while the other holes adopt 42 mm diameter blast holes and 35 mm diameter explosive sticks. First, the effect of charge diameter on damage range and cut cavity formation was analyzed. Next, simulation of wedge cut for different charge diameters was conducted to reveal the stress wave developments and compare the stress field intensities. Finally, field tests were conducted to verify the viability of this technique. The results indicate that large diameter charges can increase the damage range around cut holes to improve the fragmentation degree of the rock mass in the cut cavity and significantly enhance the cavity formation power to better expel the rock mass fragments. The stress wave evolution of wedge cut was visualized using numerical simulations, which confirmed that the use of large diameter charges in cut holes increases the stress field intensity in the cut cavity and hence increases the damage degree of the rock mass. In this study, the use of a large diameter charge for cut blasting increased the average footage by 0.30 m, and the average utilization rate of blast holes increased by 12.5%. Therefore, the cutting effects in hard rock roadways can be improved by using large diameter charges, which increase the blasting footage and the utilization rate of blast holes. |
| format | Article |
| id | doaj-art-3cff4ebd0fd94ad0860056caede591ca |
| institution | DOAJ |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-3cff4ebd0fd94ad0860056caede591ca2025-08-20T02:39:12ZengWileyAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/88734128873412A Study on Cut Blasting with Large Diameter Charges in Hard Rock RoadwaysBing Cheng0Haibo Wang1Qi Zong2Ying Xu3MengXiang Wang4Qiangqiang Zheng5Chengjie Li6School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaTo overcome the problems of poor cutting effects in hard rock roadways, a cut blasting technique with large diameter charges was developed; that is, the cut holes employ 50 mm diameter blast holes and 45 mm diameter explosive sticks, while the other holes adopt 42 mm diameter blast holes and 35 mm diameter explosive sticks. First, the effect of charge diameter on damage range and cut cavity formation was analyzed. Next, simulation of wedge cut for different charge diameters was conducted to reveal the stress wave developments and compare the stress field intensities. Finally, field tests were conducted to verify the viability of this technique. The results indicate that large diameter charges can increase the damage range around cut holes to improve the fragmentation degree of the rock mass in the cut cavity and significantly enhance the cavity formation power to better expel the rock mass fragments. The stress wave evolution of wedge cut was visualized using numerical simulations, which confirmed that the use of large diameter charges in cut holes increases the stress field intensity in the cut cavity and hence increases the damage degree of the rock mass. In this study, the use of a large diameter charge for cut blasting increased the average footage by 0.30 m, and the average utilization rate of blast holes increased by 12.5%. Therefore, the cutting effects in hard rock roadways can be improved by using large diameter charges, which increase the blasting footage and the utilization rate of blast holes.http://dx.doi.org/10.1155/2020/8873412 |
| spellingShingle | Bing Cheng Haibo Wang Qi Zong Ying Xu MengXiang Wang Qiangqiang Zheng Chengjie Li A Study on Cut Blasting with Large Diameter Charges in Hard Rock Roadways Advances in Civil Engineering |
| title | A Study on Cut Blasting with Large Diameter Charges in Hard Rock Roadways |
| title_full | A Study on Cut Blasting with Large Diameter Charges in Hard Rock Roadways |
| title_fullStr | A Study on Cut Blasting with Large Diameter Charges in Hard Rock Roadways |
| title_full_unstemmed | A Study on Cut Blasting with Large Diameter Charges in Hard Rock Roadways |
| title_short | A Study on Cut Blasting with Large Diameter Charges in Hard Rock Roadways |
| title_sort | study on cut blasting with large diameter charges in hard rock roadways |
| url | http://dx.doi.org/10.1155/2020/8873412 |
| work_keys_str_mv | AT bingcheng astudyoncutblastingwithlargediameterchargesinhardrockroadways AT haibowang astudyoncutblastingwithlargediameterchargesinhardrockroadways AT qizong astudyoncutblastingwithlargediameterchargesinhardrockroadways AT yingxu astudyoncutblastingwithlargediameterchargesinhardrockroadways AT mengxiangwang astudyoncutblastingwithlargediameterchargesinhardrockroadways AT qiangqiangzheng astudyoncutblastingwithlargediameterchargesinhardrockroadways AT chengjieli astudyoncutblastingwithlargediameterchargesinhardrockroadways AT bingcheng studyoncutblastingwithlargediameterchargesinhardrockroadways AT haibowang studyoncutblastingwithlargediameterchargesinhardrockroadways AT qizong studyoncutblastingwithlargediameterchargesinhardrockroadways AT yingxu studyoncutblastingwithlargediameterchargesinhardrockroadways AT mengxiangwang studyoncutblastingwithlargediameterchargesinhardrockroadways AT qiangqiangzheng studyoncutblastingwithlargediameterchargesinhardrockroadways AT chengjieli studyoncutblastingwithlargediameterchargesinhardrockroadways |