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Control Technology for Oversized Fragments in Engineering Blasting at Pingtanyuan Pumped-storage Power Station Project
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Zhan-zhi TAN1, Guang-hui ZHANG2, Ming CHEN1, Jia-tuo ZHANG2, Yuan-long CHENG2
Blasting | 2025, 42(2) : 67 - 72
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Blasting | 2025, 42(2): 67-72
• BLASTING IN ORE AND ROCK •
Control Technology for Oversized Fragments in Engineering Blasting at Pingtanyuan Pumped-storage Power Station Project
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Zhan-zhi TAN1, Guang-hui ZHANG2, Ming CHEN1, Jia-tuo ZHANG2, Yuan-long CHENG2
Affiliations
  • 1.State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, China
  • 2.Luotian Pingtanyuan Pumped Storage Co., Ltd. of Hubei Energy Group, Huanggang 438000, China
Published: 2025-06-01 doi: 10.3963/j.issn.1001-487X.2025.02.008
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The occurrence of oversized fragments during blasting operations significantly increases the cost of blasting, crushing, and hauling expenses. This study addressed the slab' phenomenon observed in the blasting of intact hard rock at the Pingtanyuan Pumped Storage Power Station, where the oversized fragments of the surface blasting area was up to 6 m×5 m×2.5 m. Through comprehensive mechanism analysis, the investigation indicated that the quality of the stemming was the key reason for forming large fragments at the upper part. Meanwhile, the mechanism of its influence lies in the over-long stemming length of the original blasting scheme, which resulted in a low charge center, leading to insufficient energy distribution at the top of the blast hole. Furthermore, an oversized blasting fragments control measurement based on stemming quality optimization was proposed. The stemming length was optimized from 3~4 m to 2.1~2.4 m using a time-sharing piecewise calculation method and the optimization principle, which allowed the part of the stemming structure to rush out of the blast hole. Besides, the decontaminated rock chips were used as stemming material. The results show that the optimized scheme prevented the occurrence of the slab phenomenon, significantly reduced boulder rates, and saved rock breakage costs.

intact hard rock  /  blasting  /  oversize blasting fragments  /  stemming length
Zhan-zhi TAN, Guang-hui ZHANG, Ming CHEN, Jia-tuo ZHANG, Yuan-long CHENG. Control Technology for Oversized Fragments in Engineering Blasting at Pingtanyuan Pumped-storage Power Station Project[J]. Blasting, 2025 , 42 (2) : 67 -72 . DOI: 10.3963/j.issn.1001-487X.2025.02.008
Funding
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  • National Natural Science Foundation of China(U24B20110)
  • National Natural Science Foundation of China(51979205)
Appendix
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Year 2025 volume 42 Issue 2
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Article Info
doi: 10.3963/j.issn.1001-487X.2025.02.008
  • Receive Date：2025-01-26
  • Online Date：2026-03-19
  • Published：2025-06-01
Article Data
Affiliations
History
  • Received：2025-01-26
Funding
National Natural Science Foundation of China(U24B20110)
National Natural Science Foundation of China(51979205)
Affiliations
    1.State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, China
    2.Luotian Pingtanyuan Pumped Storage Co., Ltd. of Hubei Energy Group, Huanggang 438000, China

Corresponding:

CHEN Ming (1977-), male, Ph. D, professor, mainly engaged in hydropower engineering construction technology, engineering blasting and rock dynamics research, (E-mail) .
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Citations
表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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