CAJ | 학술논문

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。
위료연구불동공극수압대매암삼투특성적영향규률，이용 MTS 전액사복암석시험계통대심부광정적매암시건진행료불동공극수압、우기시고공극수압하적매암삼투특성시험。결과표명：삼투솔이급체적응변곡선구유교호적일치성，균정현U자형주세；이재외계조건일정적정황하，공극수압대삼투성능이급체적응변적작용효과여해매암공극수압림계역치유관，고우림계역치적공극수압대매암삼투성능기도수배우저공극수압시적개선작용。차외，공극수압대매암강도겁한역유중요영향，차공극수압유고，매암적파배강도겁한유저，확용효과유명현，삼투솔봉치역유가후연。연구결과대이용고공극수압개선매암삼투성능、제고매층주수방재효과구일정지도의의。
For the purpose of studying the influences of permeability properties affected by the differ-ent pore-water pressures, MTS electro-hydraulic servo system has been utilized to conduct the permea-bility characteristics experiments of specimens from deep coal mine under the conditions of the different pore-water pressures, especially the high pore-water pressures. The results show that the permeability rate curves are quite consistent with volumetric strain curves, which are both U-shaped. Meanwhile, under a certain external condition, the effect of the pore-water pressures on the permeability properties and volumetric-strain depends on the critical threshold pore-water pressures of coal specimens. The permeability properties under higher pore-water pressure than the critical threshold have been improved several times than that under lower pore-water pressure. Moreover, the pore-water pressure has an im-portant influence on ultimate strength of coal rock. The higher the pore-water pressure is, the lower the peak strength is. The more distinctive effects of dilatation emerge, the more strain is needed for the ap-pearance of permeability peak. The research result provides the guidance for the employment of high pore-water pressure to improve the permeability and disaster prevention of coal seam water injection.