温度作用后花岗岩微观孔隙结构和渗透率的研究

doi:10.11896/cldb.21070003

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Abstract To investigate the effect of temperature on the pore structure and seepage characteristics of granite, samples were subjected to a scanning electron microscopy (SEM) test, a high-pressure mercury injection test and a seepage test. From SEM of the microscopic characteristics, morphological characteristics of the capillary pressure curve, entrance, pore size distribution, porosity, permeability and other aspects are stu-died. The conventional permeability prediction models have been corrected, and the calculated permeability and measured permeability are compared and analysed. The results showed that there were initial micro-cracks and pores in the granite, with irregular pore shapes. With the increase in temperature, the pore throat of the granite develops continuously as the temperature rises, and the mercury inflow curve in the granite mercury injection curve becomes smoother, and the mercury removal rate gradually increases. The pore volume and total pore volume of micropores, mesopores and transition pores in the sample gradually become larger, the pore size distribution range expands, the connectivity enhances and the porosity increases. Granite's permeability generally increases exponentially with temperature and increases greatly after 400 ℃. The increase in the number of large pores in the sample is the primary reason for the increased permeability of granite. The permeability predicted by the modified Winland model for high-temperature granite is close to the permeability tested by the experiment, indicating that the granite permeability model is more reasonable under the combined influence of the characteristic value of pore-throat radius and porosity. The research results will provide a theoretical basis for the scheme design of high-temperature rock mass geothermal development engineering.

Key words： microscopic pore structure porosity pore size distribution permeability prediction model

Published: Online: 2023-07-10

CLC number:

TU45

Fund:Natural Science Foundation of Heilongjiang Province(LH2019D011) and Key Laboratory of Mining Engineering of Universities of Heilongjiang Province(2013-KF04).

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	GAO Hongmei
	LAN Yongwei
	GUO Nan

Cite this article:

GAO Hongmei,LAN Yongwei,GUO Nan. Study on Microscopic Pore Structure and Permeability of Granite After Temperature Action[J]. Materials Reports, 2023, 37(13): 21070003-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21070003 OR http://www.mater-rep.com/EN/Y2023/V37/I13/21070003

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