温度对两种含瓦斯煤样力学特性影响的实验研究

Abstract

本文利用自主研发的含瓦斯煤热流固耦合伺服渗流试验装置，以原煤及型煤试样为研究对象，进行了不同温度条件下两种含瓦斯煤三轴压缩全应力–应变试验。研究结果表明：在围压及瓦斯压力恒定的条件下，温度对含瓦斯煤岩的弹性模量影响存在门槛值，当温度低于门槛值时，含瓦斯煤岩的弹性模量随着温度升高而增大，当温度高于门槛值时，含瓦斯煤岩的弹性模量随着温度升高而降低，同时，含瓦斯煤岩的抗压强度随温度的升高而有着较显著的降低，表明温度对煤样强度具有软化效应。 Based on the self-developed device called the coal-containing heat solid coupling servo seepage device, the experimental study on effect of temperature on mechanical properties of two types of the coal containing gas under triaxial compression conditions has been carried out. The results show that: under the conditions of constant confining pressure and gas pressure, there exists a threshold when temperature has an impact on the elastic modulus of the coal containing gas. When the temperature is lower than the threshold value, the elastic modulus of the coal containing gas increases as the temperature rises. When the temperature is higher than the threshold value, the elastic modulus of the coal containing gas decreases as the temperature rises. In addition, the compressive strength of the coal containing gas has a more significant reduction as the temperature rises, indicating that the temperature has softening effect on the strength of the coal containing gas.