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为了掌握砂砾岩在三维应力作用下的渗流规律,开展了理论和试验研究。把渗透系数设定成孔隙率变化量的函数,再基于孔隙弹性理论推导孔隙率变化量和应力之间的关系,建立了孔隙型岩石的渗流应力耦合特性关系式,其表明平均有效应力是控制孔隙型岩石渗透系数变化的主要因素。在渗流-三轴应力耦合试验机上开展的砂砾岩渗流应力耦合试验的结果进一步证明,砂砾岩渗透系数与平均有效应力成负指数函数关系。根据理论分析和试验结果建立了砂砾岩在三维应力作用下的耦合特性关系模型。
In order to grasp the seepage regularity of glutenite under three-dimensional stress, theoretical and experimental studies have been carried out. The permeability coefficient is set as a function of the change of porosity, and then the relationship between the change of porosity and stress is deduced based on the theory of pore elasticity. The relationship between the seepage stress coupling characteristics of porous rock is established, which shows that the average effective stress is controlled The main factor for the change of permeability coefficient of pore rock. The results of coupling test of seepage - triaxial stress coupling test on gravel seepage stress further prove that the permeability coefficient of sandstone and gravel has a negative exponential function with the average effective stress. According to the theoretical analysis and experimental results, the coupling model between glutenite and three-dimensional stress is established.