Abstract Microwave treatment has been considered as a promising rock breakage method. The weakening mechanism of vaporizing expansion of pore water in sandstone under microwave irradiation was studied in this paper. The effect of water in the heating process was studied by comparing the heating characteristics of dry and saturated sandstones, which was further explained by the mercury intrusion porosimetry tests. Moreover, the influencing factors including rock strength, permeability, saturation degree and microwave power on rock bursting were investigated by comparing the bursting time of water-bearing sandstone samples under microwave irradiation. The results show that water plays a more important role in the heating process of sandstones with higher porosity and lower microwave sensitivity. The heating curves of saturated sandstones can be divided into 3 stages according to the heating rate, which is related to the interaction of water heating and steam escape during microwave irradiation. In addition, it is found that the favorable conditions of water-bearing sandstone bursting under microwave irradiation are low rock strength, low permeability, high saturation degree and high microwave power. This law can be explained by the interaction of rock properties and the generation, increase, diffusion, and escape of steam in rock.

中文翻译：

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含水砂岩微波压裂：加热特性与爆破

摘要 微波处理被认为是一种很有前景的岩石破碎方法。研究了微波辐照下砂岩孔隙水汽化膨胀的弱化机制。通过比较干砂岩和饱和砂岩的加热特性，研究了水在加热过程中的作用，并通过压汞孔隙率测试进一步解释了这一点。此外，通过比较含水砂岩样品在微波辐照下的爆破时间，研究了岩石强度、渗透率、饱和度和微波功率等因素对岩爆的影响。结果表明，水在孔隙度较高、微波敏感性较低的砂岩的加热过程中起着更重要的作用。饱和砂岩的加热曲线根据加热速率可分为3个阶段，这与微波辐照过程中水加热和蒸汽逸出的相互作用有关。此外，发现微波辐照下含水砂岩爆裂的有利条件是岩石强度低、渗透率低、饱和度高、微波功率大。这一规律可以用岩石性质与岩石中蒸汽的产生、增加、扩散和逸出的相互作用来解释。高饱和度和高微波功率。这一规律可以通过岩石性质与岩石中蒸汽的产生、增加、扩散和逸出的相互作用来解释。高饱和度和高微波功率。这一规律可以用岩石性质与岩石中蒸汽的产生、增加、扩散和逸出的相互作用来解释。