Abstract
The method of adding particles to water jet can significantly improve the rock breaking efficiency, and it is helpful to increase the rate of penetration for hard and abrasive formation. To compare the vertical and inclined particle jet on the rock failure mechanism and the effect of confining pressure, this paper adopted the SPH-FEM coupling method and the results were verified by experiments. The inclined jet impacting the rock at a certain angle can cause a widespread damage under the comprehensive effect of direct impact and radial stretch. The inclined particle jet is more efficient and easier to form large destruction when the inclined angle is in the appropriate range of 15°–20°. The hole profile formed by the vertical impact of the particle jet is conical. The lower edge of the hole profile formed by the inclined impact of the particle jet is parabolic, which is approximately parallel to the incident direction. Confining pressure can reduce the damage range and peak value of stress wave, but the critical rock breaking pressure will increase with increase of confining pressure. Compared with the condition of no confining pressure, the initial damage of rock delays under confining pressure.
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