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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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

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	Articles by authors
	JIA Hailiang1
	HAN Li1
	SUN Qiang2
	DONG Yuanhong3
	JIN Long4

Cite this article:

JIA Hailiang1,HAN Li1,SUN Qiang2, et al. Thawing and softening behaviors and underlying damage mechanisms of frozen quartz sandstone under microwave irradiation[J]. , 2021, 40(9): 1884-1893.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0479 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I9/1884

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