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利用RMT-150B岩石力学试验系统和GD-65/150高低温环境箱,对经历不同温度后煤系泥岩的力学特性进行试验研究,分析不同温度下煤系泥岩的应力-应变全过程曲线、峰值应力、峰值应变、弹性模量、变形模量以及泊松比受温度的影响。研究结果表明,不同温度下泥岩的力学特性有差异。随温度的升高,其峰值应力、峰值应变有不同程度的降低,其峰值应力从25℃时的9.153 MPa下降到55℃时的8.271 MPa,降幅为9.6%;峰值应变从25℃时的11.002×10-3下降到55℃时的8.249×10-3,降幅达25.0%。弹性模量随温度的升高逐渐减小,变形模量随温度的升高而增大,泊松比随温度的升高逐渐减小,由此得到各参数变量随温度的变化关系。研究成果可为深井高温软岩巷道的围岩控制提供理论基础。
The mechanical properties of the coal measures mudstone under different temperatures were studied by using RMT-150B rock mechanics test system and GD-65/150 high and low temperature environment chamber. The stress-strain whole process curve of coal measures mudstone at different temperatures and peak Stress, peak strain, elastic modulus, modulus of deformation, and Poisson’s ratio are affected by temperature. The results show that there are differences in the mechanical properties of mudstone at different temperatures. With the increase of temperature, the peak stress and peak strain decreased to some extent. The peak stress decreased from 9.153 MPa at 25 ℃ to 8.271 MPa at 9.6 ℃, a decrease of 9.6%. The peak strain increased from 11.002 at 25 ℃ × 10-3 down to 55 ℃ when 8.249 × 10-3, a decline of 25.0%. The elastic modulus decreases with the increase of temperature, and the deformation modulus increases with the increase of temperature. The Poisson’s ratio decreases with the increase of temperature, and the variation of each parameter with temperature is obtained. The research results can provide theoretical basis for surrounding rock control of deep soft rock tunnel.