煤系泥岩全应力—应变渗透试验研究

Test Research on Coal Measures Mudstone Permeability along Complete Stress-strain Path

为了研究煤系泥岩在采动受力变形过程中渗透率变化的特点,进行了全应力—应变过程的渗透性试验。试验结果得出渗透率随轴向应力的增加可划分3个阶段,在此基础上,考虑渗透率与应力全过程耦合相对复杂的特点,对两者在峰前进行了耦合分析,得出其耦合曲线回归方程,探索了应力峰值和渗透率峰值相互间的关联效应。揭示了煤系泥岩在采动条件下渗透率的变化规律,为解决煤矿开采突水问题提供较重要的参考依据。

The permeability test in the complete stress-strain process was conducted in order to study the change characteristics of coal measures mudstone's permeability in the process of mining deformation.The test results showed that the increase of the permeability with the axial stress can be divided into three stages.On this basis,the pre-peak coupling analysis was conducted on the permeability and the complete stress process in consideration of their relatively complex features,the coupling regression equations of the permeability and the complete stress process were obtained,and investigation and study were made on the associated effect between the stress peak and the permeability peak.The results indicated that the mudstone's permeability did not reach the maximum value when most rock specimens' stress reached the peak value,and the permeability peak lagged behind the rock stress peak.This test research revealed the change rule of coal measures mudstone's permeability under mining condition,and can provide a more important reference for the solution of water inrush in coal mines.