Experimental Investigation of Mechanical Properties of Three Types of High Temperature Rocks After Liquid Nitrogen Cooling

doi:10.12068/j.issn.1005-3026.2021.11.011

Abstract

Abstract: In order to investigate the effect of liquid nitrogen on the physical and mechanical properties of high-temperature rocks， a series of laboratory tests were carried out on granite， gneiss and sandstone specimens cooled with liquid nitrogen at different temperatures(25~350℃). The damage mechanisms of the three types of rocks were analyzed in combination with microscopic observations.The results show that the increase in temperature exacerbates the damage to the internal structure of the rock induced by liquid nitrogen. With the increase of temperature， the porosity and peak strain of the rock gradually increase， while the P-wave velocity， compressive strength and elastic modulus of the rock decrease. Thermal stresses generated by heating and liquid nitrogen cooling lead to the initiation and propagation of microcracks mainly along quartz mineral boundaries within the rock. The sensitivity of the three types of rocks to heating and liquid nitrogen cooling differs， depending on the lithogenesis， mineral composition， type of cementation， and pore structure of rocks.

Key words: hot dry rock; liquid nitrogen cooling; high temperature; mechanical property; microscopic observation

CLC Number:

TP20

DONG Shuo， SHA Song， MENG Shi-qian， RONG Guan. Experimental Investigation of Mechanical Properties of Three Types of High Temperature Rocks After Liquid Nitrogen Cooling[J]. Journal of Northeastern University(Natural Science), 2021, 42(11): 1591-1599.

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