Abstract
Combined laser–mechanical rock breaking drilling is an emerging technology that uses laser-assisted mechanical rock breaking to efficiently drill wells. A physical model of rectangular and circular laser spot scanning rock breaking is developed using the energy conservation theorem and heat transfer related theories, and the reasonableness of the model is analyzed through a combination of experiments and simulations. The effect of two kinds of scanning spots on the strength and drillability of granite was also obtained experimentally, and the effect of two kinds of laser spot scanning on rock breaking was evaluated. The results show that the uniaxial compressive strength of the rock decreases by 24% and 15%, the tensile strength by 20% and 11%, and the drillability by 16% and 10%, respectively, after scanning the granite with rectangular and circular laser spots at the stated parameters, and that the rock breaking effect of the rectangular scanning spot is better than that of the circular scanning spot.
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