Study on the Damage and Energy Evolution Law of Granite Under Microwave Irradiation
Based on the law of conservation of energy,uniaxial compression test was carried out on the granite after microwave pretreatment by controlling different parameters of microwave pretreatment.The evolution law of total strain energy,elastic energy and dis-sipative energy during the process of granite failure was analyzed.The research results show that,under the same microwave power,with the increase of microwave irradiation time,the longitudinal wave velocity and compressive strength of the specimen are in a de-creasing trend.According to the change rule of each energy proportion and energy evolution curve of granite in deformation damage,the evolution process of granite under microwave irradiation can be divided into the initial growth stage of dissipated energy,sta-ble growth stage of dissipated energy,stable development stage of dissipated energy,ac-celerated energy dissipation stage in front of the peak,and the stage of sharp rise of dissi-pated energy.The granite energy evolution process shows a certain regularity with the in-crease of microwave irradiation time,and the proportion of its stage I gradually increases with the increase of microwave irradiation time.When the microwave irradiation time is 600 s,the percentage of dissipated energy increases from 17.53% to 27.07% without mi-crowave irradiation,the energy-based brittleness index decreases from 0.82 to 0.73,the energy absorption capacity and energy storage limit of the rock decreases,and the plasticity of the rock enhances,which suggests that the microwave contributes to the rock's transformation from brittle to brittle-ductile.
国家科技期刊平台
NSTL
万方数据
