Abstract
To reveal the stress and strain field in rock under abrasive slurry jet (ASJ) impacting, this paper carried out experiments to measure the dynamic rock strain using a novel strain measurement approach, which is the non-contact strain measurement system. Moreover, it was compared with the theoretical analysis of stress propagation in rock. The results showed that dynamic strain will propagate within rock in the form of spherical waves, whose maximum value is proportional to the jet pressure and inversely proportional to the square of the propagation distance. In the process of ASJ impacting rock, strain will increase from zero to a maximum value in milliseconds. Dynamic strain in rock is fluctuates due to the release of internal stress caused by the rock crushing, which can reflect that rock will be broken by ASJ in the form of stepped-failure. The paper reveals the dynamic strain distribution in rock broken by ASJ and provides a new idea and method for studying the rock failure mechanism under ASJ impacting.
Highlights
In recent years, abrasive slurry jet (ASJ) and abrasive water jet (AWJ) have been widely applied to kinds of engineering works, such as material manufacturing, rock breaking, and so on [1,2,3]
The paper can reveal the dynamic strain distribution in rock broken by ASJ and provide a new idea and method for studying the rock failure mechanics under ASJ impacting
The non-contact strain measurement system, this paper carried out experiments to measure the dynamic rock strain to reveal the stress and strain field in rock under ASJ
Summary
Abrasive slurry jet (ASJ) and abrasive water jet (AWJ) have been widely applied to kinds of engineering works, such as material manufacturing, rock breaking, and so on [1,2,3]. Pang used ASJ and AWJ to cut and drill glass, which showed that the ASJ has advantages in its performance of glass grooving and punching [6] These works are useful for improving the quality of material manufacturing with water jets. According to the above literature review, most of the papers focus on the capacity of water jets in rock cutting, while there are few studies on the dynamic stress strain distribution in rock, which is significant to reveal the mechanism of rock failure impacted by abrasive water jet. The paper can reveal the dynamic strain distribution in rock broken by ASJ and provide a new idea and method for studying the rock failure mechanics under ASJ impacting
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