Effect of high temperature on the mechanical properties of the sandstone physical weak bond

被引：0
作者：
Ma J. [1 ]
Wei S. [1 ]
Su C. [1 ]
机构：
[1] School of Energy Science and Engineering, The Collaborative Innovation Center of Coal Safety Production of Henan, Henan Polytechnic University, Jiaozuo, 454003, Henan
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2017年 / 34卷 / 01期
关键词：
High temperature; Physical and mechanical parameters; Rock mechanics; Sandstone; Three axial compression; Weak bond;
D O I：
10.13545/j.cnki.jmse.2017.01.024
中图分类号：
学科分类号：
摘要：
The relationship between the mechanical and physical parameters of weak bonding sandstone and temperature and confining pressure was analyzed based on tests of the samples after high temperature (400-1000℃). The test results have shown that temperature has little effect on volume, mass and velocity of specimen after baking under 400℃; above 400℃ baking, volume expansion ratio and burning loss rate monotonically increase as the temperature rises; velocity monotonically decreases as the temperature rises. The value of uniaxial compression deformation parameter after 400℃ and 800℃ is obviously greater than that in natural state (25℃). Elastic modulus and deformation modulus decrease sharply after 1000℃, and ultimate strain increases monotonically as the temperature rises. Elastic modulus, deformation modulus, and peak strength of specimens are positively correlated to the confining pressure; a good linear relationship exists between peak strength and confining pressure, which accords with Coulomb strength criterion. High temperature has little effect on cohesion of speci mens when temperature is below 800℃; but cohesion decreases sharply when temperature exceeds 800℃. Internal friction angle of specimens is positively correlated to the temperature. High temperature below 1000℃ has strengthening effect on weak bonding medium sandstone; and the effect will weaken when the temperature exceeds 800℃. Failure angles of Mohr-Coulomb theory are approximately equivalent to test results, and negative correlation exists between the testing failure angles of the specimens and the confining pressure. © 2017, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：155 / 162
页数：7
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