Abstract: Microwave absorption tests were carried out on 11 typical rock-forming minerals using the 2450 MHz frequency multimode resonator. The microwave sensitivity of the minerals were studied according to the heating rate and temperature increment. This study determined the mineral compositions of Chifeng basalt, Anshan gabbro, and Kunming sandstone, respectively. Based on the obtained mineral compositions, the microwave absorptivity of three types of rocks was predicted and further verified by the microwave radiation testing results. Then the uniaxial compressive strength of three types of rocks was measured, and the relationship between the strength reduction and microwave absorption capacity of rock was analyzed after the microwave treatment. The results show that the microwave absorption capacity of the main rock-forming minerals can be divided into three categories. The microwave absorption capacity of rock can be predicted according to the mineral compositions of the rock. The rock containing the mineral with strong microwave absorption capacity also has a strong microwave absorption capacity. The stronger the microwave absorption capacity of the rock is, the greater the reduction of uniaxial compression strength after microwave radiation.

Key words: rock mechanics, rock-forming minerals, microwave absorption capacity, heating rate, uniaxial compressive strength