Understanding the effects of microwave irradiation and thermal treatment on the dynamic compression and fragmentation properties of rocks is essential to quantify energy consumption in rock engineering. In this study, Fangshan granite (FG) specimens were exposed to microwave irradiation and heat treatment. The damage of FG specimens induced by these two methods was compared using X-ray CT scanning and ultrasonic wave method. The temperatures of FG after microwave irradiation and thermal treatment were effectively evaluated using a newly proposed technique. A novelty method for precisely determining the geometric features of fragments is developed to estimate the fragmentation energy. Thus, the dynamic uniaxial compressive strength (UCS), the dynamic fragmentation characteristics, and the fragmentation energy of FG after these two pretreatment methods can be reasonably compared. The noticeable distinction of loading rate effect on the dynamic UCS of FG between these two pretreatment methods is first observed. A relationship is established between the dynamic UCS and the damage induced by microwave irradiation and heat treatment. Moreover, fragmentation energy fan analysis is introduced to accurately compare the fragmentation properties of FG after two pretreatment methods in dynamic compression tests.

中文翻译：

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不同温度和加载速率下微波和热辅助岩石破碎方法的比较


了解微波辐射和热处理对岩石动态压缩和破碎特性的影响对于量化岩石工程中的能耗至关重要。在这项研究中，房山花岗岩（FG）标本接受了微波辐射和热处理。采用X射线CT扫描法和超声波法对这两种方法对FG标本造成的损伤进行比较。使用新提出的技术可以有效评估微波辐射和热处理后 FG 的温度。开发了一种精确确定碎片几何特征的新颖方法来估计碎片能量。因此，可以合理比较这两种预处理方法后FG的动态单轴抗压强度（UCS）、动态破碎特性和破碎能。首先观察到这两种预处理方法之间加载率对 FG 动态 UCS 影响的显着差异。动态 UCS 与微波辐射和热处理引起的损伤之间建立了关系。此外，引入破碎能扇分析，准确比较动态压缩试验中两种预处理方法后FG的破碎特性。