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为了研究不同孔隙水压对煤岩渗透特性的影响规律,利用MTS电液伺服岩石试验系统对深部矿井的煤岩试件进行了不同孔隙水压、尤其是高孔隙水压下的煤岩渗透特性试验。结果表明:渗透率以及体积应变曲线具有较好的一致性,均呈现U字形走势;而在外界条件一定的情况下,孔隙水压对渗透性能以及体积应变的作用效果与该煤岩孔隙水压临界阈值有关,高于临界阈值的孔隙水压对煤岩渗透性能起到数倍于低孔隙水压时的改善作用。此外,孔隙水压对煤岩强度极限亦有重要影响,且孔隙水压愈高,煤岩的破坏强度极限愈低,扩容效果愈明显,渗透率峰值亦愈加后延。研究结果对利用高孔隙水压改善煤岩渗透性能、提高煤层注水防灾效果具一定指导意义。
In order to study the influence of different pore pressures on permeability characteristics of coal and rock, the MTS electro-hydraulic servo rock test system was used to test the permeability of coal and rock samples in deep mines with different pore pressures, especially in high pore pressures test. The results show that the permeability and volume strain curves have good consistency and all show a U-shaped trend. Under certain external conditions, the effects of pore water pressure on permeability and volumetric strain are in good agreement with the pore-water pressure The critical threshold, the pore water pressure above the critical threshold of coal permeability can play several times the improvement of low pore pressure. In addition, the pore water pressure also has an important influence on the strength limit of coal and rock, and the higher the pore water pressure, the lower the ultimate strength of coal and rock failure, the more obvious the dilatancy effect and the more delayed the peak permeability. The results of this study are of guiding significance for improving the permeability of coal and rock by using high pore pressure and improving the disaster prevention effect of water injection.