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为研究随采深增加煤岩的渗流变化趋势,利用含瓦斯煤热-流-固耦合三轴伺服渗流装置,进行不同温度下孔隙压力改变的渗流试验,建立力热耦合作用下考虑滑脱效应的煤岩渗透率模型,采用试验数据验证模型的有效性。研究结果表明:在孔隙压力增大过程中,瓦斯流量逐渐增加,随温度升高体积应变、径向应变均呈降低趋势,轴向应变呈先降低后升高趋势;随孔隙压力增大,煤岩渗透率先逐渐减小后趋于平缓,且随温度升高,煤岩渗透率呈增大趋势;考虑力热耦合作用下煤岩渗透率模型计算出的渗透率与试验所测结果吻合较好;在低孔隙压力下滑脱效应较明显,随着孔隙压力增大,滑脱效应逐渐减弱。
In order to study the tendency of percolation of coal and rock along with the increase of mining depth, the seepage experiment of pore pressure change under different temperatures was carried out by using the three-axis servo seepage device with gas-coal-coal-fluid heat-fluid-solid coupling to establish the sliding- Coal and rock permeability model, the experimental data to verify the validity of the model. The results show that the flow rate of gas increases gradually with the increase of pore pressure, the volumetric strain and radial strain decrease with the increase of temperature, and the axial strain decreases first and then increases with the increasing of pore pressure. The permeability of rock decreases gradually and then tends to be gentle. With the temperature increasing, the permeability of coal and rock shows an increasing trend. The calculated permeability of coal and rock permeability model is in good agreement with the experimental data Under the low pore pressure, the slippage effect is more obvious. As the pore pressure increases, the slippage effect gradually decreases.