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| EXPERIMENTAL STUDY OF MECHANICAL CHARACTERISTICS
OF COAL-SERIAL SANDY MUDSTONE AT
DIFFERENT TEMPERATURES |
| ZHA Wenhua1，2，SONG Xinlong1，2，WU Tengfei1，2 |
(1. Key Laboratory of Mine Safety and High Efficient Mining Cosponsored by Anhui Province and Ministry of Education，Anhui University of Science and Technology，Huainan，Anhui 232001，China；2. College of Energy and Safety，Anhui University of
Science and Technology，Huainan，Anhui 232001，China) |
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Abstract Laboratory tests were carried out to study the mechanical properties of coal-serial sandy mudstone under the temperature from 25℃ to 55 ℃ using the test system of rock mechanics RMT–150B and the temperature chamber GD–65/150. The complete stress-strain curve，the peak stress，the peak strain，the elastic modulus and the deformation modulus of the sandy mudstone under investigation were affected by the temperature conditions. As the temperature increases，the peak stress and the peak strain decrease gradually，but the peak stress and the peak strain decrease with a different values depending on whether the temperature is lower or higher than 40 ℃. The peak stress decreases 22.1% if the temperature is between 25 ℃ to 40 ℃ and decreases 4.3% between 40 ℃ to 55 ℃；The peak strain decreases 12.9% if the temperature is between is between 25 ℃ to 40 ℃ and decreases 29.9% between 40 ℃ to 55℃. The elastic modulus and the deformation modulus both decrease linearly with the increasing of temperature. The results are useful for the efficiency and safety of deep coal mining.
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Received: 18 November 2013
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2014, Vol. 33 
