Pore characteristics and mechanical properties of sandstone under the influence of temperature

被引:94
|
作者
Zhang, Yuliang [1 ]
Sun, Qiang [1 ]
He, Huan [2 ]
Cao, Liwen [1 ]
Zhang, Weiqiang [1 ]
Wang, Bo [3 ]
机构
[1] China Univ Min & Technol, Sch Resources & Geosci, Xuzhou 221008, Jiangsu, Peoples R China
[2] China Univ Min & Technol, Sch Chem Engn & Technol, Minist Educ, Key Lab Coal Proc & Efficient Utilizat, Xuzhou 221008, Jiangsu, Peoples R China
[3] China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221008, Jiangsu, Peoples R China
关键词
Sandstone; High temperature; Porosity; Strength; Poisson's ratio; Elastic modulus; FRACTAL CHARACTERISTICS; THERMAL-CONDUCTIVITY; WAVE VELOCITIES; ROCKS; POROSITY; PERMEABILITY; FIRE; MICROSTRUCTURE; MICROCRACKING; RESISTIVITY;
D O I
10.1016/j.applthermaleng.2016.11.061
中图分类号
O414.1 [热力学];
学科分类号
摘要
This paper experimentally studies the variation of pore characteristics and mechanical properties of sandstone at different temperatures (from 25 degrees C to 600 degrees C). The results show that the sandstone samples mainly have holes with diameters between 0.7 gm and 3 gm and at threshold diameters of 0.01 gm and 3 mu m, the cumulative pore volume changes drastically. The threshold temperature of sandstone is 400 degrees C. If the temperature is lower than 400 degrees C, the elastic modulus reduces quickly, while the pore characteristics and other mechanical properties change slightly. Between 400 degrees C and 600 degrees C, the cumulative pore volume and porosity increase rapidly, while the fractal dimension of pore volume decreases drastically. In this case, the porosity increases by about 234%; the peak strength decreases by 31.1% and the peak strain rises rapidly by 83.3%. The Poisson's ratio decreases drastically at 500 degrees C. The difference in crack expanding speed at the temperature below or abOve 400 degrees C, and the inflation and the decomposition of minerals such as kaolinite and quartz are the main reasons for the Variation of relevant parameters. This research is of great significance for studying the changes of physical and mechanical properties of rock after heating treatment. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:537 / 543
页数:7
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