温度对煤系泥岩力学特征影响的试验研究

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。

Experimental study of mechanical characteristics of coal-serial mudstone under different temperatures

Laboratory tests are made to study the mechanical properties of coal-serial mudstone under different temperatures by using the rock mechanics test system RMT－150B and high and low temperature environmental chamber GD－65/150. The effects of complete stress-strain curve, peak stress, peak strain, elastic modulus, deformation modulus and Poisson's ratios of mudstone at different temperatures are analyzed. The results show that, there are differences at different temperatures in mechanical properties of mudstone. As the temperature increases, peak stress and peak strain decrease in different amplitudes; peak stress decreases from 9.153 MPa in 25 ℃ to 8.271 MPa in 55 ℃, and a 9.6 percent decline; peak strain decreases from 11.002×10-3 in 25 ℃ to 8.249×10-3 in 55 ℃, and a 25.0 percent decline. Elastic modulus decreases gradually with the increasing temperature. Deformation modulus increases with the increasing temperature. Poisson's ratio decreases gradually with the increasing temperature; and the relation between various parameter variables and temperature is obtained. Research results provide a theoretical basis for the rock control in deep high temperature soft rock roadway.