Blast Vibration Control in A Hydropower Station for the Safety of Adjacent Structure
The transverse cofferdam in Xiangjiaba hydropower station was a water retaining concrete structure with a length of 126 m, a width of 12 m, and a height of 25.2 m, consisting of masonry, plain concrete structure (PC), and roller compacted concrete (RCC), which had to be demolished by blasting after...
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| Format: | Article |
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MDPI AG
2020-09-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/18/6195 |
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| author | Yuanjun Ma Changwu Liu Ping Wang Jun Zhu Xianliang Zhou |
| author_facet | Yuanjun Ma Changwu Liu Ping Wang Jun Zhu Xianliang Zhou |
| author_sort | Yuanjun Ma |
| collection | DOAJ |
| description | The transverse cofferdam in Xiangjiaba hydropower station was a water retaining concrete structure with a length of 126 m, a width of 12 m, and a height of 25.2 m, consisting of masonry, plain concrete structure (PC), and roller compacted concrete (RCC), which had to be demolished by blasting after the dam was built. There were many precise instruments nearby the cofferdam which had strict restrictions on blasting vibration. Therefore, the cofferdam was divided into six blasting regions, including land blasting and underwater blasting. Blasting parameters and blasting network structure were accurately designed and continuously optimized through blast-induced vibration test results. At nine measurement points in different locations, 57 blast vibration data were recorded. Consequently, 1386 holes with an explosive weight of 9641.3 kg were detonated in land blasting. The highest levels of vibration were recorded as 8.74 cm/s in the desilting tunnel on the right of the cofferdam. The explosives up to 11887.7 kg were detonated in an underwater blasting. According to the analysis of the law of vibration attenuation, the blast vibration value was reduced to 7.65 cm/s. The results showed that the research on the attenuation law of blasting vibration can effectively increase the charge weight per delay and control the blast-induced vibration. Consequently, the peak particle velocity (<i>PPV</i>) of underwater blasting could be predicted by analyzing the <i>PPV</i> of land blasting in same structure, which provided the basis for the design of underwater blasting parameters. A reliable method for cofferdam demolition in hydropower station was proposed, which provided a reference for similar projects. |
| first_indexed | 2024-03-10T16:31:52Z |
| format | Article |
| id | doaj.art-64f8fc915255422ab266bbeb18103320 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T16:31:52Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-64f8fc915255422ab266bbeb181033202023-11-20T12:46:34ZengMDPI AGApplied Sciences2076-34172020-09-011018619510.3390/app10186195Blast Vibration Control in A Hydropower Station for the Safety of Adjacent StructureYuanjun Ma0Changwu Liu1Ping Wang2Jun Zhu3Xianliang Zhou4State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, ChinaWork Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Goal Mines, Hunan University of Science and Technology, Xiangtan 411201, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, ChinaInstitute of Disaster Management and Reconstruction, Sichuan University and The Hong Kong Plotechnic University, Chengdu 610065, ChinaThe transverse cofferdam in Xiangjiaba hydropower station was a water retaining concrete structure with a length of 126 m, a width of 12 m, and a height of 25.2 m, consisting of masonry, plain concrete structure (PC), and roller compacted concrete (RCC), which had to be demolished by blasting after the dam was built. There were many precise instruments nearby the cofferdam which had strict restrictions on blasting vibration. Therefore, the cofferdam was divided into six blasting regions, including land blasting and underwater blasting. Blasting parameters and blasting network structure were accurately designed and continuously optimized through blast-induced vibration test results. At nine measurement points in different locations, 57 blast vibration data were recorded. Consequently, 1386 holes with an explosive weight of 9641.3 kg were detonated in land blasting. The highest levels of vibration were recorded as 8.74 cm/s in the desilting tunnel on the right of the cofferdam. The explosives up to 11887.7 kg were detonated in an underwater blasting. According to the analysis of the law of vibration attenuation, the blast vibration value was reduced to 7.65 cm/s. The results showed that the research on the attenuation law of blasting vibration can effectively increase the charge weight per delay and control the blast-induced vibration. Consequently, the peak particle velocity (<i>PPV</i>) of underwater blasting could be predicted by analyzing the <i>PPV</i> of land blasting in same structure, which provided the basis for the design of underwater blasting parameters. A reliable method for cofferdam demolition in hydropower station was proposed, which provided a reference for similar projects.https://www.mdpi.com/2076-3417/10/18/6195hydropower stationcofferdamblast vibrationvibration attenuation |
| spellingShingle | Yuanjun Ma Changwu Liu Ping Wang Jun Zhu Xianliang Zhou Blast Vibration Control in A Hydropower Station for the Safety of Adjacent Structure Applied Sciences hydropower station cofferdam blast vibration vibration attenuation |
| title | Blast Vibration Control in A Hydropower Station for the Safety of Adjacent Structure |
| title_full | Blast Vibration Control in A Hydropower Station for the Safety of Adjacent Structure |
| title_fullStr | Blast Vibration Control in A Hydropower Station for the Safety of Adjacent Structure |
| title_full_unstemmed | Blast Vibration Control in A Hydropower Station for the Safety of Adjacent Structure |
| title_short | Blast Vibration Control in A Hydropower Station for the Safety of Adjacent Structure |
| title_sort | blast vibration control in a hydropower station for the safety of adjacent structure |
| topic | hydropower station cofferdam blast vibration vibration attenuation |
| url | https://www.mdpi.com/2076-3417/10/18/6195 |
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