Effects of Focus Geometry on the Hard Rock-Cutting Performance of an Abrasive Waterjet

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Abrasive waterjets are being increasingly used in civil engineering for rock and concrete cutting, particularly for the demolition or repair of old structures. The energy of an abrasive waterjet is primarily provided by the accelerated abrasive. The momentum transfer during mixing and acceleration determines the abrasive velocity, which affects the cutting performance. Meanwhile, the geometry of the focus at which mixing occurs influences the momentum transfer efficiency. In this study, the effects of the focus geometry on the optimum abrasive flow rate (AFR) and momentum transfer characteristics in hard rock cutting were investigated. Experiments were conducted using granite specimens to test the AFR under different focus geometry conditions such as diameter and length. The results show that the focus geometry significantly affects the maximum cutting depth and optimum AFR. The maximum cutting energy was analyzed based on the cutting efficiency of a single abrasive particle. In addition, the momentum transfer parameter (MTP) was evaluated from the empirical relationship between the maximum energy and the cutting depth for granitic rocks. Accordingly, a model for estimating the MTP based on the AFR was developed. It is expected that the results of this study can be employed for the optimization of waterjet rock cutting.
Publisher
HINDAWI LTD
Issue Date
2020-01
Language
English
Article Type
Article
Citation

ADVANCES IN CIVIL ENGINEERING, v.2020

ISSN
1687-8086
DOI
10.1155/2020/1650914
URI
http://hdl.handle.net/10203/272417
Appears in Collection
CE-Journal Papers(저널논문)
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