Experimental study on radial decoupling charge blasting with air and water

• Autorzy: Yang Deqiang , An Huaming , Lei Zhen

Identyfikatory

DOI

10.37190/msc202718

• Języki publikacji: EN

Abstrakty

EN

In order to investigate the effects of the different medium on the initial impact pressure and fragmentation of the hole wall under radial decoupling charge, this paper analyzes and compares the initial impact pressure of hole wall and the size of blasting lumpiness theoretically when air and water are used as a coupling medium. Combined with blasting model test, strain datas are collected by high-speed multi-channel dynamic stress testing system, and the lumpiness of the model test is sieved and measured. The blasting lumpiness is analyzed by G–G–S distribution function. The results show that compared with the air radial decoupling charge, the water radial decoupling charge has higher blasting peak pressure and more uniform lumpiness. According to the relation between peak strain pressure and decoupling coefficient, the optimal decoupling coefficients of air and water are 1.71 and 1.67, respectively. The results show that the best blasting effect can be achieved by using a small hole diameter of water-decoupling charge compared with air-decoupling charge. When the decoupling coefficient is 1.50, the average lumpiness size, distribution of large block and boulder yield of blasting lumpiness in water-decoupling medium are minimum, and only the average lumpiness size and distribution of large block are minimum in airdecoupling medium. Applying the test results to the smooth blasting of cutting has certain guiding significance for improving the blasting effect.

Słowa kluczowe

EN

radial decoupling charge; concrete model; strain; blasting lumpiness; boulder yield

• Wydawca: Wydział Geoinżynierii, Górnictwa i Geologii, Instytut Górnictwa Politechniki Wrocławskiej
• Czasopismo: Mining Science
• Rocznik: 2020
• Tom: Vol. 27
• Strony: 265--281
• Opis fizyczny: Bibliogr. 18 poz., rys., tab.

Twórcy

autor

Yang Deqiang

• Civil and Resource Engineering School, University of Science and Technology Beijing, Beijing, 100083, China

autor

An Huaming

• Kunming University of Science and Technology, Kunming, 650093, China

autor

Lei Zhen

• Guizhou Institute of Technology, Guiyang, 550003, China

Bibliografia

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