高温焙烧后黏土孔隙与力学特征研究

doi:10.13722/j.cnki.jrme.2014.1229

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Abstract To study the change laws of clay pore and mechanical parameters under different temperature effect，this paper，taking the different-temperature roasted clay as the research object，mainly analyzed the law of porosity，permeability，fractal dimension of pore volume，uniaxial compressive strength and Protodyakonov scale of hardness by using the mercury injection method and uniaxial compression test. The findings were as follows：The pore in samples was dominated by the open pore，and the connection among pores was well. The main pore size ranged from 500 nm to 1 000 nm. Within the temperature range tested，the total volume of macropores increased with the temperature rising，the total volume of micropores increased between 100 ℃～650 ℃ but decreased over 650 ℃ as the temperature rose；Porosity increased between 100 ℃～700 ℃ but had a slightly decline over 700 ℃ with the increase of temperature；the fractal dimension of pore volume，by means of Menger fractal sponge and thermodynamic model，in general increased with the temperature rising，and the pore characteristics of samples could be represented better by the fractal dimension of pore volume through thermodynamics；with increasing temperature，the permeability increased when the temperature ranged from 100 ℃ to 700 ℃ and slightly decreased when the temperature exceeded 700 ℃；as the temperature rose，uniaxial compressive strength and Protodyakonov scale of hardness remained constant basically between 100 ℃～400 ℃，increased rapidly between 400 ℃～700 ℃ and decreased over 700℃，which was closely related to the transformation of minerals inside samples.

Key words： high-temperature roasted clay pore characteristics fractal permeability mechanical properties

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.1229 OR http://www.rockmech.org/EN/Y2015/V34/I07/20

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