The internal failure of rock samples subjected to pulsed water jet impacts

详细信息    查看全文

• 作者：Sevda Dehkhoda ; ^{sevda.dehkhoda@uqconnect.edu.au" class="auth_mail} ; Michael Hood
• 关键词：Pulsed water jet ; Rock breakage ; Internal failure ; Micro-crack density ; Pulse length ; Pulsation frequency
• 刊名：International Journal of Rock Mechanics and Mining Sciences
• 出版年：February, 2014
• 年：2014
• 卷：66
• 期：Complete
• 页码：91-96
• 全文大小：1908 K

文摘

The capacity of pulsed water jets for creating internal breakdown within a rock target was the subject of this investigation. The resultant, internal damage is defined as an increase in micro-crack density within the rock samples. It is attributed to the occurrence of a fatigue phenomenon resulting from the periodic impacts of high-velocity water-pulses and from the interaction of the induced stress-waves within the target material. This paper reports an investigation into the extent to which fatigue damage occurred in rocks that were subjected to pulsed, water jet impacts. For this purpose, the wave-attenuation capacity of rock samples, before and after being subjected to a pulsed water jet, was measured and the relative disparity between these two figures was then utilised as a measure of the potency of the pulsed water jets in producing an internal breakdown within the rock targets. The results indicated and confirmed the occurrence of internal damage in tested marble and granite samples. The pulse lengths and the pulsation frequencies of the water jets were found to cooperate in developing the internal damage and, depending on the rock type, one played a more significant role than the other.