【摘要】 为了探究微波辐射对硬岩损伤的影响规律,减轻破岩难度,以湖北花岗岩作为研究对象,岩石孔隙率、超声波波速和岩石抗拉强度作为损伤变量指标,通过试验法测得岩石在微波辐射下的损伤规律。结果表明:在一定微波辐射功率范围内,花岗岩受微波辐射影响不大,而当辐射功率与辐射时间达到某一值时,随着辐射功率增大、辐射时间增长,岩石会出现明显的损伤,表现为孔隙率上升、抗拉强度降低、超声波波速下降;在等耗能情况下,高辐射功率、短辐射时间较低辐射功率、长辐射时间更能引起岩石的损伤;水是引起岩石损伤的重要因素,饱和岩石试件相对于干燥岩石试件在微波辐射后损伤变量指标变化更加显著;低功率、短时间微波辐射能使岩石强度增强。更多还原

【Abstract】 In order to explore the effect of microwave radiation on hard rock damage and reduce the difficulty of rock breakage,the granite rock was used as the research object. Rock porosity,ultrasonic wave velocity and rock tensile strength were used as indicators of damage. Rock damage under microwave irradiation was measured by the experimental method. The results show that the granite is not affected by microwave radiation within a certain range of microwave radiation power,and when the radiation power and radiation time reach a certain value,as the radiation power increases and the radiation time increases,the rock will be significantly degraded,manifesting as increased porosity,reduced tensile strength,and decreased ultrasonic wave velocity; in the case of equal energy consumption,compared with low radiation power,long radiation time,high radiation power,short radiation time can cause more damage of the rock; water is an important factor causing rock damage,compared with the dry rock specimen, the change of the damage index of the saturated rock after microwave irradiation is more significant; the low-power,short-time microwave radiation energy makes the rock strength increase.更多还原