A persistent increase in the permeability of rock mass caused by transient stress disturbances could explain the variation in groundwater level caused by earthquakes in the far-fields, increase in petroleum production due to artificial vibrations, induction of small earthquakes by seismic waves in intermediate and far-fields, etc. However, the effect of transient stress disturbances on rock permeability has not yet been fully clarified. In this study, the permeability of triaxially fractured Inada granite under multiple transient disturbances in axial stress was measured to clarify the effects of the transient stress disturbances on the fractured rock permeability. In the experiments, the permeability of fractured Inada granite decreased with time. However, the permeability increased with each series of axial stress disturbances whose amplitude was 3 MPa or larger. The degree of increase in permeability increased with the axial stress disturbance amplitudes. The increased permeability decreased with time and the duration in which the permeability decreased to its value before the disturbances was longer for larger axial stress disturbance amplitudes. The increase in permeability could be employed to enhance oil and gas productions, prevent large earthquakes, reroute underground water flow, etc.

中文翻译：

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多重瞬态轴向应力扰动对破碎稻田花岗岩渗透率变化的室内研究

由瞬时应力扰动引起的岩体渗透率的持续增加可以解释远场地震引起的地下水位变化、人工振动引起的石油产量增加、中远地震波诱发小地震。场等。然而，瞬态应力扰动对岩石渗透率的影响尚未完全阐明。本研究通过测量轴向应力多重瞬态扰动下三轴裂隙稻田花岗岩的渗透率，以阐明瞬态应力扰动对裂隙岩石渗透率的影响。在实验中，裂缝稻田花岗岩的渗透率随着时间的推移而降低。然而，渗透率随着每一系列振幅为3 MPa或更大的轴向应力扰动而增加。渗透率增加的程度随着轴向应力扰动幅度的增加而增加。增加的渗透率随着时间的推移而下降，对于较大的轴向应力干扰幅度，渗透率下降到干扰前的值的持续时间更长。渗透率的增加可用于提高石油和天然气产量，防止大地震，改变地下水流路线等。