不同温度条件下煤系砂质泥岩力学特征试验研究

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摘要利用RMT–150B岩石力学试验系统和GD–65/150高低温环境箱，对煤系砂质泥岩在25 ℃～55 ℃温度下的力学特性开展试验研究，分析不同温度下砂质泥岩的应力–应变全过程曲线、峰值应力、峰值应变、弹性模量以及变形模量受温度的影响。研究结果表明，不同温度下砂质泥岩的力学特性有差异。随着温度的升高，其峰值应力、峰值应变逐渐降低，但在40 ℃前后峰值应力和峰值应变随温度的升高其减小幅度不同，峰值应力值从25 ℃到40 ℃降幅达22.1%，从40℃到55℃降幅达4.3%，峰值应变从25 ℃到40 ℃减小了12.9%，从40 ℃到55 ℃应变减小了29.9%；弹性模量随着温度的升高呈线性减小；变形模量随着温度的升高呈线性增大。研究结果对实施深部煤炭的安全高效开采以及深部软岩工程灾害的预测和控制具重要的理论意义和实用价值。

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关键词 ：岩石力学, 煤系砂质泥岩, 不同温度, 单轴压缩, 力学特征

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.

Key words： rock mechanics coal-serial sandy mudstone different temperatures uniaxial compression mechanical characteristics

收稿日期: 2013-11-18

引用本文:

查文华1，2，宋新龙1，2，武腾飞1，2. 不同温度条件下煤系砂质泥岩力学特征试验研究[J]. 岩石力学与工程学报, 2014, 33(4): 809-816.
ZHA Wenhua1，2，SONG Xinlong1，2，WU Tengfei1，2. EXPERIMENTAL STUDY OF MECHANICAL CHARACTERISTICS OF COAL-SERIAL SANDY MUDSTONE AT DIFFERENT TEMPERATURES. , 2014, 33(4): 809-816.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2014/V33/I4/809

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