Abstract:

Based on the principle of unsteady heat transfer, the distribution of temperature field in the rock under the action of Gauss laser beam to the rock surface was analyzed, using the temperature field distribution combined with the method of thermal stress equation to simulate thermal stress distribution of both the rock and the rock with spherical materials. The numerical simulation results show that, if treated with the same laser beam for the same time, the value of thermal stress near the edge of the inclusions caused by the rock with inclusions is bigger than that without inclusions, that is, when the same laser power and irradiation time act on the rocks with or without in them, the rocks having inclusions are more likely to break. In nature, most of the rocks contain impurities, and this work provides the theoretical basis for the laser rock breaking under conditions of rocks containing impurities.

Key words: thermal stress, rock breaking, laser, temperature field