| Rock burst is one of the mining disasters, and it is difficult to predict leading to loss of property and workers'life. Hence, searching for effective methods to govern the rock burst, which is main subjects of mining accident decrease. Comparing with traditional methods of large aperture mechanical hole-drilling and water-jet hole-drilling, it can get a good result from small aperture mechanical hole-drilling,which can be studied further as a new approach. Consequently, this paper studies cutting seams by high-pressure water jet, we can get the conclusions:Firstly, studying the elementary theory of high pressure water jet, analyzing the water jet construction, parameters as well as the actual mechanism, the main reasons of coal and rock shedding are fracture expansion and the water wedge under water jet.Secondly, conducting experimental research on similar material simulation by high pressure water jet. We can get cutting volumn, cutting depth of different water jet pressure and the relationship between cutting volumn and cutting depth of different water jet quantity. From the aspect of the experiment, it demonstrates that not high pressure is good and great quantity is good. When pressure and quantity is beyond certain value, it can be reduced the ability of cutting seams.Thirdly, researching on numerical simulation of high pressure water jet, applying nonlinear finite elements program ANSYS to analyze the cutting plane stress of the process of cutting seams. We can get the similarity of cutting plane stress, discordant stress function and stress concentration of low seams under different jet pressure, and the theoretical analysis can match experimental phenomenon.This paper analyzes the influence of high pressure water jet by theoretical analysis, experiment and numerical simulation, and the conclusions can be applied to study rock burst governce by water jet, which is useful and meaningful to guide other realms using the technology of water jet. |
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