Abstract
To investigate the jet breaking mechanism of hard rocks under three-dimensional stress, jet breaking experiments under different ground stresses and horizontal stress differences were performed. The results showed that the rock-breaking holes were in the shape of an “inverted Ω". The ground stress had an obvious effect on the rock-breaking performance of the jet. As the ground stress increased, the rock strength increased, and the rock-breaking performance decreased by 28.56%. At ground stresses greater than 50 MPa, the rock-breaking performance increased by 20%. The horizontal stress difference made the pore wall stress concentrated and loosened the cementation between mineral particles. As the stress difference increased, the roughness increased, and the rock-breaking performance increased by 58.85% while the energy consumption decreased by 25.56%. The results of this study provide data and technical support for the jet breaking of hard rock in deep mine construction.
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