微波照射冻结石英砂岩热融软化特性及损伤机制研究

doi:10.13722/j.cnki.jrme.2021.0479

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摘要冻结岩石的强度和硬度均比常温岩石高数倍，导致冻结岩层的开挖成本高、开挖效率低。提出一种基于微波照射的冻结岩层辅助开挖新思路，该方法的效果不取决于岩石是否含有吸波矿物，适用地层广泛。以不含吸波矿物的石英砂岩为研究对象，探究其在微波作用下的热融软化规律；并基于微波照射前、后试样细观孔隙结构的观测，总结了微波作用下饱和冻结石英砂岩的热融软化机制。研究表明：(1) 微波作用下饱和冻结石英砂岩经历了孔隙冰快速融化、融水剧烈汽化和试样干燥3个阶段；(2) 微波作用对饱和冻结石英砂岩的强度具有显著的软化效应，饱和冻结砂岩在微波照射至汽化结束阶段，强度下降至冻结状态的1/5；(3) 微波照射下饱和冻结石英砂岩的软化主要由汽胀效应和热胀效应2个过程引起，汽胀效应主要造成试样颗粒间孔隙扩展，而热胀效应则造成试样颗粒内部断裂。研究成果为微波照射辅助破碎冻结岩石提供了理论和试验支撑。

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	贾海梁1
	韩力1
	孙强2
	董元宏3
	金龙4

关键词 ：岩石力学, 微波照射, 冻结砂岩, 热融软化, 损伤机制

Abstract：The strength and hardness of frozen rock are several times higher than those of rock at room temperature，which leads to high excavation cost and low excavation efficiency of frozen rock layers. A new idea of employing microwave irradiation as an assisted method in excavation of frozen rock strata was proposed，which does not depend on whether the rock contains absorbing minerals and can be applied in a wide range of strata. In this paper，the quartz sandstone，which does not contain absorbing minerals，was used to explore the law of thermal melting and softening behaviors of frozen rocks under microwave irradiation. The underlying damage mechanisms were discussed and summarized based on the observation of the mesopore structure of samples before and after microwave irradiation. The results show that：(1) thawing of frozen sandstone has three stages under microwave irradiation，including rapid melting of pore ice，intense vaporization of melt water and sample drying，(2) microwave irradiation has a significant softening effect on frozen sandstone，and the strength of frozen sandstone after microwave irradiation decreases to one-fifth of that before the irradiation，and (3) the softening of saturated frozen sandstone under microwave irradiation is primarily caused by vaporization expansion effect and thermal expansion effect. The vaporization expansion effect causes the propagation of intergranular cracks，while the thermal expansion effect may induce trans-granular cracking. This study provides theoretical and experimental support for microwave-assisted breakage of frozen rock.

Key words： rock mechanics microwave irradiation frozen sandstone thawing and softening laws damage mechanisms

引用本文:

贾海梁1，韩力1，孙强2，董元宏3，金龙4. 微波照射冻结石英砂岩热融软化特性及损伤机制研究[J]. 岩石力学与工程学报, 2021, 40(9): 1884-1893.
JIA Hailiang1，HAN Li1，SUN Qiang2，DONG Yuanhong3，JIN Long4. Thawing and softening behaviors and underlying damage mechanisms of frozen quartz sandstone under microwave irradiation. , 2021, 40(9): 1884-1893.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0479 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I9/1884

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